100525 + Interview Questions in GENERAL QA IN GENERAL AWARENESS

1.	For a sequential reaction `NH_(3)to N_(2)+H_(2)....(i)` `H_(2)+O_(2) to H_(2)O......(ii)` What will be the amount of water which will be obtained if 5 moles of `NH_(3)` is mixed with 3 moles of `O_(2)` & % yeild of `1^(st) & 2^(nd)` reaction is 50% & 80 % respectively.A. 3 molesB. 2.5 molesC. 2 molesD. 2.4 moles
Answer» Correct Answer - 1 `{:(2NH_(3),overset(50%)to,N_(2)(g),+,3H_(2)(g)),("5 mole",,(5/2 "mole")/2,,(3/2xx5"mole")/2),(H_(2)(g),+,1/2O_(2)(g),overset(80%)to,H_(2)O(l)),(3.75 "mole",,"3mole (LR)",,3.75xx0.8=3" mole"):}`

Discussion

2.	How much sugar will be required if each person on the earth is given 100 molecules of sugar? The population of the earth is 3×1010.
Answer» The sugar given to the entire population on earth is 3 × 10¹⁰× 10²= 3 ×10¹² molecules. One mole (6 ×10²³) molecules of sugar corresponds to 342 g. Hence, 3×10¹² molecules of sugar corresponds to \(\frac{3 \times 10^{12}}{6 \times 10^{23}} \times 342\) = 170.43 x 10^-11 g. Therefore, sugar required is 170.43 × 10⁻¹¹ g.

2.

How much sugar will be required if each person on the earth is given 100 molecules of sugar? The population of the earth is 3×1010.

Answer»

The sugar given to the entire population on earth is 3 × 10¹⁰× 10²= 3 ×10¹² molecules.

One mole (6 ×10²³) molecules of sugar corresponds to 342 g.

Hence, 3×10¹² molecules of sugar corresponds to \(\frac{3 \times 10^{12}}{6 \times 10^{23}} \times 342\) = 170.43 x 10^-11 g.

Therefore, sugar required is 170.43 × 10⁻¹¹ g.

Discussion

3.	Calculate the mass % of `Na_(2)CO_(3)` in a mixture having mass 206 gm which produced 24 litre of `CO_(2)` at 1 atm pressure & 300 K wich axcess of HCl. [R=0.08 atm lit/mok K]A. 0.485B. 0.515C. 0.4D. 0.6
Answer» Correct Answer - 2 `underset("1 mole")(Na_(2)CO_(3))+2HCl to 2NaCl+H_(2)O(l)+underset("1 mole ")(CO_(2)(g))` `=1xx106=106 gm` PV=nRT `n=(1xx24)/(0.8xx300)=24/24=1 ` mole % of `Na_(2)CO_(3)=106/206xx100=51.5%`

Discussion

4.	Arrange the hydrogen halides in increasing order of acid strengths.
Answer» Acid strength: `HFltHClltHBrltHI`

Discussion

5.	Chlorine heptoxide was was dissolved in water. As a result an acid was obtained. Name the acid formed?
Answer» `Cl_2O_7+H_2Oto2HClO_4`

Discussion

6.	Beakers A, B and C contain zinc sulphate, silver nitrate and iron (II) sulphate solutions respectively. Copper pieces are added to each beaker. Blue colour will appear in case of : (A) Beaker A (B) Beaker B (C) Beaker C (D) All the beakers
Answer» Correct option (B) Beaker B Explanation: In beaker (B) 2AgNO₃ +Cu→ Cu(NO₃) 2Ag

6.

Beakers A, B and C contain zinc sulphate, silver nitrate and iron (II) sulphate solutions respectively. Copper pieces are added to each beaker. Blue colour will appear in case of : (A) Beaker A (B) Beaker B (C) Beaker C (D) All the beakers

Answer»

Correct option (B) Beaker B

Explanation:

In beaker (B) 2AgNO₃ +Cu→ Cu(NO₃) 2Ag

Discussion

7.	The reaction involved during the removal of temporary hardness of water is:A. `2CaCl_(2)+(NaPO_(3))_(6)rarrNa_(2)(Ca_(2)(PO_(3))_(6))+4NaCl`B. `CaCl_(2)+Na_(2)CO_(3)rarrCaCO_(3)darr+2NaCl`C. `MgSO_(4)+Na_(2)Al_(2)Si_(2)O_(8)xH_(2)OrarrMgAl_(2)Si_(2)O_(7)xH_(2)O+Na_(2)SO_(4)`D. `Ca(HCO_(3))_(2)overset(Delta)rarrCaCO_(3)+H_(2)O+CO_(2)darr`
Answer» Correct Answer - d

Discussion

8.	When `H_(2)O_(2)` is reacted with `K_(2)Cr_(2)O_(7)" in dilute "H_(2)SO_(4)` and then ether is added. The ether layer gets -colourA. RedB. YellowC. BlueD. Green
Answer» Correct Answer - c

Discussion

9.	Iron filling and water were placed in a 5 litre tank and sealed. The tank was heated to 1273 K. Upon analysis the tank was found to contain 1.10 gram of hydrogen and 42.5 gm of water vapour. If the reaction in the tank is represented by `3Fe(s)+4H_(2)O(g)hArrFe_(3)O_(4)(s)+4H_(2)(g)` the equilibrium constant will be-A. `2.949xx10^(-3)`B. `6.490xx10^(3)`C. `4.940xx10^(3)`D. `3.200xx10^(3)`
Answer» Correct Answer - a

Discussion

10.	Iron filing and water were placed in a 5 litre tank and sealed.The tank was heated to 1237 k. Upon anaiysis the tank was found to contain 1.10 gram of hydropen and 42.5 gm of water vapour. If the reaction in the tank is represented by `3Fe(s) + 4H_(2)O(g) hArr Fe_(3)O(g) + 4H_(2)(g)` the equilibrium constant will be -A. `2.949 xx 10^(3)`B. `6.490 xx 10^(3)`C. `4.90 xx 10^(3)`D. `3.200 xx 10^(3)`
Answer» Correct Answer - A

Discussion

11.	What happens when sulphur is treated with conc. nitric acid ? (A) Nitric oxide, sulphuric acid and water are produced (B) Nitric oxide, sulphurous acid and water are produced (C) Sulphurous acid, nitrogen dioxide and water are produced (D) Sulphuric acid, nitrogen dioxide and water are produced.
Answer» Correct option (D) Sulphuric acid, nitrogen dioxide and water are produced. Explanation: S + Conc. 6HNO₃ → H₂SO₄ + 6NO₂ + 2H₂O

11.

What happens when sulphur is treated with conc. nitric acid ? (A) Nitric oxide, sulphuric acid and water are produced (B) Nitric oxide, sulphurous acid and water are produced (C) Sulphurous acid, nitrogen dioxide and water are produced (D) Sulphuric acid, nitrogen dioxide and water are produced.

Answer»

Correct option (D) Sulphuric acid, nitrogen dioxide and water are produced.

Explanation:

S + Conc. 6HNO₃ → H₂SO₄ + 6NO₂ + 2H₂O

Discussion

12.	Which of the following set of molecules are having square pyramidal and pyramidal shape respectively.A. `ICl_(4)^(-) and SiF_(4)`B. `NF_(3) and IF_(5)`C. `KeOF_(4) and H_(3)O^(+)`D. `BrF_(5) and NF_(4)^(+)`
Answer» Correct Answer - C

Discussion

13.	The correct IUPAC name of 1,3-dibromo butan -1- one isA. 2,4-dibromo buton-4-oneB. 3-bromo butanoyl bromideC. 3-bromo-3-methyl propanoyl bromideD. `beta`-bromo butyry bromide
Answer» Correct Answer - B

Discussion

14.	The electrolytic reduction technique is used in the extraction of : (A) Highly electronegative elements (B) Transition metals (C) Metalloids (D) Highly electropositive metals
Answer» Correct option (D) Highly electropositive metals Explanation: The electrolytic reduction technique is used in the extraction of higly electropositive element.

14.

The electrolytic reduction technique is used in the extraction of : (A) Highly electronegative elements (B) Transition metals (C) Metalloids (D) Highly electropositive metals

Answer»

Correct option (D) Highly electropositive metals

Explanation:

The electrolytic reduction technique is used in the extraction of higly electropositive element.

Discussion

15.	Which one in each of the following pairs is larger in size ? (a) Na, Mg+2 (b) 11Na, 13Al
Answer» (a) Na is larger in size than Mg⁺². (b) ₁₁Na is larger in size than ₁₃Al.

15.

Which one in each of the following pairs is larger in size ? (a) Na, Mg+2 (b) 11Na, 13Al

Answer»

(a) Na is larger in size than Mg⁺².

(b) ₁₁Na is larger in size than ₁₃Al.

Discussion

16.	Auto reduction process is used in the extraction of : (A) Cu and Hg (B) Zn and Hg (C) Cu and Al (D) Fe and Pb
Answer» Correct option (A) Cu and Hg Explanation: Auto reduction process is used for the extraction of Cu and Hg.

16.

Auto reduction process is used in the extraction of : (A) Cu and Hg (B) Zn and Hg (C) Cu and Al (D) Fe and Pb

Answer»

Correct option (A) Cu and Hg

Explanation:

Auto reduction process is used for the extraction of Cu and Hg.

Discussion

17.	How do you test for hydrogen gas ?
Answer» (1) Bring burning candle near the gas. (2) It puts off the candle with pop sound.

17.

How do you test for hydrogen gas ?

Answer»

(1) Bring burning candle near the gas.

(2) It puts off the candle with pop sound.

Discussion

18.	Density of a gas is found to be `5.46//dm^(3)` at `27^(@)C` at 2 bar pressure What will be its density at `STP` ? .A. 3 gm/litB. 2 gm/litC. 1.5 gm/litD. 1 gm/lit
Answer» Correct Answer - A `PM=dRTrArr(P_(1))/(d_(1)T_(1))=(R_(2))/(d_(2)T_(2))` ` rArr(2)/(5.46xx300)=(1)/(d xx273)`

Discussion

19.	Van Arkel method of purification of metals involves conversion of metal to a : (A) Volatile stable compound (B) Volatile unstable compound (C) Non volatile stable compound (D) None of the above
Answer» Correct option (A) Volatile stable compound Explanation: Van Arkel method is used to purified metals like Ti, Zr, etc. In this method ores are converted into volatile stable compounds.

19.

Van Arkel method of purification of metals involves conversion of metal to a : (A) Volatile stable compound (B) Volatile unstable compound (C) Non volatile stable compound (D) None of the above

Answer»

Correct option (A) Volatile stable compound

Explanation:

Van Arkel method is used to purified metals like Ti, Zr, etc. In this method ores are converted into volatile stable compounds.

Discussion

20.	Lens used : Convexuvf10 cm10 cm5 cm(1) What is the nature of the image ? (2) What is its magnification ?
Answer» (1) The image is real and inverted. (2) Its magnification is 1.

20.

Lens used : Convexuvf10 cm10 cm5 cm(1) What is the nature of the image ? (2) What is its magnification ?

Answer»

(1) The image is real and inverted.

(2) Its magnification is 1.

Discussion

21.	Acid should be added to water, but not water to the acid. Why ?
Answer» (1) The dissolving an acid or base in water is an highly exothermic process. Care must be taken while mixing concentrated HNO₃ or concentrated H₂SO₄ with water. (2) The acid must always be added slowly to water with constant stirring. (3) If water is added to a concentrated acid, the heat generated may cause the mixture to splash out and cause burns. (4) The glass container may also break due to excessive local heating.

21.

Acid should be added to water, but not water to the acid. Why ?

Answer»

(1) The dissolving an acid or base in water is an highly exothermic process. Care must be taken while mixing concentrated HNO₃ or concentrated H₂SO₄ with water.

(2) The acid must always be added slowly to water with constant stirring.

(3) If water is added to a concentrated acid, the heat generated may cause the mixture to splash out and cause burns.

(4) The glass container may also break due to excessive local heating.

Discussion

22.	Where are used the thermite process in daily life ?
Answer» (i) Joining railings of railway tracks. (ii) Joining cracked machine parts.

22.

Where are used the thermite process in daily life ?

Answer»

(i) Joining railings of railway tracks.

(ii) Joining cracked machine parts.

Discussion

23.	Concentrated H2SO4 is diluted by adding drop by drop :(a) Water to acid with constant stirring(b) Acid to water with constant stirring(c) Water to acid followed by a base(d) Base to acid followed by cold water
Answer» Correct answer is (b) Acid to water with constant stirring If you add water to acid, you form an extremely concentrated solution of acid initially, the reaction of conc. acid with water is highly exothermic, and solution may boil very violently, splashing concentrated acid. If you add acid to water, the solution that forms is very dilute and small amount of heat released.

23.

Concentrated H2SO4 is diluted by adding drop by drop :(a) Water to acid with constant stirring(b) Acid to water with constant stirring(c) Water to acid followed by a base(d) Base to acid followed by cold water

Answer»

Correct answer is (b) Acid to water with constant stirring

If you add water to acid, you form an extremely concentrated solution of acid initially, the reaction of conc. acid with water is highly exothermic, and solution may boil very violently, splashing concentrated acid. If you add acid to water, the solution that forms is very dilute and small amount of heat released.

Discussion

24.	The pH of acid rain is approximately :(a) 5.6(b) 6.4(c) 7.0(d) 7.9
Answer» Correct answer is (a) 5.6 When rain combines with sulfur dioxide or nitrogen oxides - produced from automobiles and thermal power plants - the rain becomes acidic typical, acid rain has a p^H less than 5.6.

24.

The pH of acid rain is approximately :(a) 5.6(b) 6.4(c) 7.0(d) 7.9

Answer»

Correct answer is (a) 5.6

When rain combines with sulfur dioxide or nitrogen oxides - produced from automobiles and thermal power plants - the rain becomes acidic typical, acid rain has a p^H less than 5.6.

Discussion

25.	Absence of tartaric acid in baking powder makes the taste of the cake bitter due to the presence of :(a) Sodium hydrogen carbonate(b) Sodium carbonate(c) Sodium metabisulphite(d) Sodium sulphate
Answer» Correct answer is (b) sodium carbonate Absence of tartaric acid in baking powder makes the taste of the cake bitter due to the presence of Na₂CO₃ (sodium carbonate) We know that sodium carbonate is basic in nature. NaHCO₃ when heated gives Na₂CO₃ + CO₂ So to neutralize the bitter taste tartaric acid is added.

25.

Absence of tartaric acid in baking powder makes the taste of the cake bitter due to the presence of :(a) Sodium hydrogen carbonate(b) Sodium carbonate(c) Sodium metabisulphite(d) Sodium sulphate

Answer»

Correct answer is (b) sodium carbonate

Absence of tartaric acid in baking powder makes the taste of the cake bitter due to the presence of Na₂CO₃ (sodium carbonate)

We know that sodium carbonate is basic in nature.

NaHCO₃ when heated gives Na₂CO₃ + CO₂

So to neutralize the bitter taste tartaric acid is added.

Discussion

26.	Why is tartaric acid added in baking powder?
Answer» Tartaric acid is added to neutralize the sodium carbonate, produced on heating sodium hydrogen carbonate. If tartaric acid is not present in baking powder, the cake will taste bitter due to the presence of sodium carbonate.

Discussion

27.	Density of a gas is found to be `5.46//dm^(3)` at `27^(@)C` at 2 bar pressure What will be its density at `STP` ? .
Answer» `(d_(1)T_(1))/P_(1)=(d_(2)T_(2))/P_(2)` `d_(1)=5.46 g dm^(-3)," " d_(2)=?` `T_(1)=273+27=300 K, " "T_(2)=273 K` `P_(1)=2 "bar"," "P_(2)=1 "bar"` `(5.46xx300)/2=(d_(2)xx273)/1` or `d_(2)=(5.46xx300)/(2xx273)=3 g dm^(-3)`

Discussion

28.	The resistance of the wire is in the inverse ratio of ____________.1. Temperature2. Resistivity3. Length4. Cross-section area
Answer» Correct Answer - Option 4 : Cross-section area The correct answer is cross-section wire. Resistance is a property of an electric circuit. It transforms electrical energy into heat energy. The reciprocal of resistance is conductance. The SI unit of resistance is the ohm. The unit is named after the German physicist George ohm. The electrical resistance is measured by two methods namely constant current or constant voltage. The resistance of a wire depends upon the material of the wire. It is directly proportional to the length of the wire. And is inversely proportional to the cross-section area.

28.

The resistance of the wire is in the inverse ratio of ____________.1. Temperature2. Resistivity3. Length4. Cross-section area

Answer» Correct Answer - Option 4 : Cross-section area

The correct answer is cross-section wire.

Resistance is a property of an electric circuit.
It transforms electrical energy into heat energy.
The reciprocal of resistance is conductance.
The SI unit of resistance is the ohm.
The unit is named after the German physicist George ohm.
The electrical resistance is measured by two methods namely constant current or constant voltage.

The resistance of a wire depends upon the material of the wire.
It is directly proportional to the length of the wire.
And is inversely proportional to the cross-section area.

Discussion

29.	A sound source sends waves of frequency 400 Hz and 2.5 m wavelength. What will be the speed of sound waves?1. 1000 m / s2. 10000 m / s3. 100 m / s4. 10 m / s
Answer» Correct Answer - Option 1 : 1000 m / s The correct answer is 1000 m /s. The sound waves are a type of longitudinal waves. These waves travel through a medium like air or water. sound waves can also be categorized into mechanical waves or pressure waves. Some of the examples of longitudinal waves are Tsunami waves, clapping, and earthquakes. To calculate the speed of sound waves, the formula will be calculated as - Speed = wavelength x frequency. The wavelength can be defined as the distance between two successive crests or two successive troughs. Frequency can be defined as the number of waves that pass through a fixed point in a definite amount of time.

29.

A sound source sends waves of frequency 400 Hz and 2.5 m wavelength. What will be the speed of sound waves?1. 1000 m / s2. 10000 m / s3. 100 m / s4. 10 m / s

Answer» Correct Answer - Option 1 : 1000 m / s

The correct answer is 1000 m /s.

The sound waves are a type of longitudinal waves.
These waves travel through a medium like air or water.
sound waves can also be categorized into mechanical waves or pressure waves.
Some of the examples of longitudinal waves are Tsunami waves, clapping, and earthquakes.

To calculate the speed of sound waves, the formula will be calculated as -

Speed = wavelength x frequency.

The wavelength can be defined as the distance between two successive crests or two successive troughs.
Frequency can be defined as the number of waves that pass through a fixed point in a definite amount of time.

Discussion

30.	1 kWh = ______ J.1. 360002. 360000003. 3600004. 3600000
Answer» Correct Answer - Option 4 : 3600000 The correct answer is 3600000. 1 Kwh is equal to 3600000 joules. The unit of energy is expressed in kilowatt hour. The energy consumed by electric utilities is also expressed in kilowatt hour. If for the time duration 1 hour, the 1 kw of power is sustained then it is called as kilowatt hour. In non-SI unit, hour is listed. The less commonly uses unit of energy is kilowatt hour. In kilowatt hour, the electrical energy is sold to consumers. Energy can neither be created nor be destroyed, it can only be transferred from one form to another.

30.

1 kWh = ______ J.1. 360002. 360000003. 3600004. 3600000

Answer» Correct Answer - Option 4 : 3600000

The correct answer is 3600000.

1 Kwh is equal to 3600000 joules.
The unit of energy is expressed in kilowatt hour.

The energy consumed by electric utilities is also expressed in kilowatt hour.
If for the time duration 1 hour, the 1 kw of power is sustained then it is called as kilowatt hour.
In non-SI unit, hour is listed.
The less commonly uses unit of energy is kilowatt hour.
In kilowatt hour, the electrical energy is sold to consumers.
Energy can neither be created nor be destroyed, it can only be transferred from one form to another.

Discussion

31.	Which gas is called super halogen?
Answer» Flourine is called super halogen as it is more reactive than other halogens.

Discussion

32.	Name the anhydride of perchloric acid.
Answer» `Cl_2O_7` is anhydride of perchloric acid.

Discussion

33.	Give the order of stability of hydrogen halides?
Answer» stability: `HFgtHClgtHBrgtHI`.

Discussion

34.	Which is corrosion resistant plastic of fluorine?
Answer» Corrosion resistant plastic of fluorine is teflon.

Discussion

35.	What is the shape of chlorne monoxide molecule?
Answer» chlorine monoxide,`Cl_2O` is angular bond angle `111^@`

Discussion

36.	The correct order of acidic nature of the oxides of chlorine isA. `Cl_(2)O lt ClO_(2) lt Cl_(2)O_(6) lt Cl_(2)O_(7)`B. `ClO_(2) lt Cl_(2)O lt Cl_(2)O_(6) lt Cl_(2)O_(7)`C. `Cl_(2)O lt ClO_(2) lt Cl_(2)O_(7) lt Cl_(2)O_(6)`D. `Cl_(2)O_(7) lt Cl_(2)O_(6) lt ClO_(2) lt Cl_(2)O`
Answer» Correct Answer - 1 As the oxidation state of central atom increases, acidic nature increases

Discussion

37.	Volume (in ml) of 0.7 M NaOH required for complete reaction with 350 ml of o.3 M `H_(3) PO_(3)` solution isA. 300 mlB. 450 mlC. 150mlD. 350ml
Answer» Correct Answer - A `2NaOH+H_(3)PO_(3)to Na_(2)HP_(3) +2H_(2)O(l)` 350 x 0.3 mm NaOH=2 x 350 x 0.3 Vx0.7=2 x 350 x 0.3 V= 300 ml

Discussion

38.	In which of the following reactions, `H_(2)O_(2)` acts as a reducing agent ?A. `2MnO_(4)^(2-)+6H^(+)+5H_(2)Orarr 2Mn^(2)+8H_(2)O+5O_(2)`B. `I_(2)+H_(2)O_(2)+2OH^(-)rarr2I^(-)+2H_(2)O+O_(2)`C. `2MnO_(4)^(-)+3H_(2)O_(2)rarr2MnO_(2)+3O_(2)+2H_(2)O`D. All of these
Answer» Correct Answer - 4 In all reactions , hydrogen peroxide acts as reducing agnet in basic or acidic medium.

Discussion

39.	The correct order of ionic radii isA. `Ca^(2+) gt K^(+) gt Cl^(-) gt S^(2-)`B. `Cl^(-) gt S^(2-) gt K^(+) gt Ca^(2+)`C. `K^(+) gt Ca^(2+) gt S^(2-) gt Cl^(-)`D.
Answer» Correct Answer - 3 For isolectronic species, as the atomic number increases , size decreases

Discussion

40.	Which of the following compound is heterocyclic compound ?A. B. C. D.
Answer» Correct Answer - 3 Oxygen is different

Discussion

41.	The rate of effusion of a particular gas whas measured to be 40ml/min. Under same condition the rate of effusion of pure methane was 20ml/min. Then find molar mass of gas.A. 4amuB. 2amuC. 4gmD. 2gm
Answer» `(r_(CH_(4)))/(r_(gas))=sqrt((M_(gas))/(16))=(20)/(40)=(1)/(2)` `M_(gas)=4gm`

Discussion

42.	Which compound is not smallest member of their corresponding homologous series ?A. AcetoneB. AcetyleneC. Acetic acidD. Ethyne
Answer» Correct Answer - 3 `underset("Acetic acid")(CH_(3)-overset(O)overset(\|\|)(C)-Ohto` smallest homologue `(H-overset(O)overset(\|\|)(C)-OH)`

Discussion

43.	For following decomposition: `N_(2)O_(4)(g)rarr2NO_(2)(g)` Calculate vapour density of mixture at a time when `20%` of `N_(2)O_(4)` has been dissociated. (Assume initially only `N_(2)O_(4)` were present)A. 110B. 92C. 76.67D. 38.33
Answer» `N_(2)O_(4)(g)rarr2NO_(2)(g)` `a_(0)-a_(0)alpha 2a_(0)alpha` `n_(avg)=(a_(0)xx92)/(a_(0)(1+alpha))=(92)/(1.2)=76.67` V.D. `=(M_("av"))/(2)=(76.67)/(2)=38.33`

Discussion

44.	Which of the following is correct IUPAC name ?A. 3,3-Dimethyl butaneB. Ethoxy methaneC. 4-Bromo-1-fluoro-2,3-epoxybutaneD. Propanone
Answer» Correct Answer - 4 `CH_(3)-overset(O)overset(\|\|)(C)-CH_(3)` Propanone

Discussion

45.	In reaction `CaF_(2)+H_(2)SO_(4)rarrCaSO_(4)+2HF` 6kg of `CaF_(2)` are treated with an excess of `H_(2)SO_(4)` and yield 2.0kg of HF. Percentage yield of reaction is:A. 0.5B. 0.39C. 0.65D. 0.79
Answer» `n_(HF)=0.1` `n_(CaF_(2))"used"=(0.1)/(2)` `w_(CaF_(2))"used"=3.9kg` `% "yiled"=(3.9)/(6)xx100=65%`

Discussion

46.	In which one of the following pairs of oxides, both oxides behave as amphoteric oxides ?A. `Cl_(2)O_(7), As_(2)O_(3)`B. `Al_(2)O_(3), As_(2)O_(3)`C. `Al_(2)O_(3), Cl_(2)O_(3)`D. `Cl_(2)O_(7), SO_(3)`
Answer» Correct Answer - 2 `Al_(2)O_(3)` as well as `As_(2)O_(3)` both dissolve in acid as well as alkali forming salts and water.

Discussion

47.	Degree of unstaturation for A. 5B. 6C. 7D. 8
Answer» Correct Answer - 3 5 double bond +2 rings=7 double bond energy

Discussion

48.	`CaCl_(2)+H_(2)SO_(4)underset(-HCl)overset((p))rarrCaSO_(4).2H_(2)Ooverset((q))rarr(r)overset(gt383K)rarr(s)` Which of the following option describes, the products, reactants and the reaction conditions.A. `{:("(p)","(q)","(r)","(s)"),("Crystallisation","Heat at 393 K",2CaSO_(4).H_(2)O,CaSO_(4)):}`B. `{:("(p)","(q)","(r)","(s)"),("Crystallisation","Heat at 393 K",2CaSO_(4).H_(2)O,CaSO_(4)),(,"at high pressure",,):}`C. `{:("(p)","(q)","(r)","(s)"),("Higher temperature","Cool",CaSO_(4).H_(2)O,CaSO_(4)):}`D. `{:("(p)","(q)","(r)","(s)"),("Higher pressure","Heat at 393 K",CaSO_(4),CaSO_(3)):}`
Answer» Correct Answer - 1 `CaCl_(2)+H_(2)SO_(4)underset(-HCl)overset("Crystallisation")rarrCaSO_(4).2H_(2)O overset(393K)rarr2CaSO_(4).H_(2)O overset(gt393K)rarrCaSO_(4)`

Discussion

49.	Which of the following represent pair of homologue.A. B. C. D.
Answer» Correct Answer - C::D Homologue usually vary by a single parameter such as the length of a carbon chain having same general formula.

Discussion

50.	`CH_(4) (g)` and `O_(2) (g)` react according to the given equation: `CH_(4) (g) + 2O_(2) (g) rarr CO_(2) (g) + 2H_(2) O (l)` Assuming that reaction take placed and goes to completion.If valve is opened then [Assume temperature remains constant `300 K` throughout ] A. `CH_(4)` gas is left after the reactionB. `O_(2)` gas is left the reaction.C. Total pressure is `(1)/(3)` atm after the reaction .D. After the reaction pressure in both the vessels will remain same
Answer» Correct Answer - A::C::D `n_(CH_(4)) = (0.5 xx 2)/(R xx 300) = (1)/(300 R)` `n_(O_(2)) = (1 xx 1)/(R xx 300) = (1)/(300 R)` `{:(,CH_(4) (g),+,2O_(2) (g),rarr,CO_(2) (g),+,2H_(2) o (l),),("Mole initially",(1)/(300R),,(1)/(300 R),,-,,-,):}` `O_(2)` is LR `CH_(2)` will be left after the reaction `{:("Mole at",(1)/(600 R),0,(1)/(600 R),-,),("Completion",,,,,):}` Total moles after completion `= n_(CH_(4) + n_(CO_(2))` `= (1)/(600 R) + (1)/(600 R)` `(1)/(300 R)` `P = (nRT)/(V) = (1)/(300 R) xx (R xx 300)/(3) = (1)/(3)` atm

Discussion

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How much sugar will be required if each person on the earth is given 100 molecules of sugar? The population of the earth is 3×1010.

Calculate the mass % of `Na_(2)CO_(3)` in a mixture having mass 206 gm which produced 24 litre of `CO_(2)` at 1 atm pressure & 300 K wich axcess of HCl. [R=0.08 atm lit/mok K]A. 0.485B. 0.515C. 0.4D. 0.6

Arrange the hydrogen halides in increasing order of acid strengths.

Chlorine heptoxide was was dissolved in water. As a result an acid was obtained. Name the acid formed?

Beakers A, B and C contain zinc sulphate, silver nitrate and iron (II) sulphate solutions respectively. Copper pieces are added to each beaker. Blue colour will appear in case of : (A) Beaker A (B) Beaker B (C) Beaker C (D) All the beakers

When `H_(2)O_(2)` is reacted with `K_(2)Cr_(2)O_(7)" in dilute "H_(2)SO_(4)` and then ether is added. The ether layer gets -colourA. RedB. YellowC. BlueD. Green

What happens when sulphur is treated with conc. nitric acid ? (A) Nitric oxide, sulphuric acid and water are produced (B) Nitric oxide, sulphurous acid and water are produced (C) Sulphurous acid, nitrogen dioxide and water are produced (D) Sulphuric acid, nitrogen dioxide and water are produced.

Which of the following set of molecules are having square pyramidal and pyramidal shape respectively.A. `ICl_(4)^(-) and SiF_(4)`B. `NF_(3) and IF_(5)`C. `KeOF_(4) and H_(3)O^(+)`D. `BrF_(5) and NF_(4)^(+)`

The correct IUPAC name of 1,3-dibromo butan -1- one isA. 2,4-dibromo buton-4-oneB. 3-bromo butanoyl bromideC. 3-bromo-3-methyl propanoyl bromideD. `beta`-bromo butyry bromide

The electrolytic reduction technique is used in the extraction of : (A) Highly electronegative elements (B) Transition metals (C) Metalloids (D) Highly electropositive metals

Which one in each of the following pairs is larger in size ? (a) Na, Mg+2 (b) 11Na, 13Al

Auto reduction process is used in the extraction of : (A) Cu and Hg (B) Zn and Hg (C) Cu and Al (D) Fe and Pb

How do you test for hydrogen gas ?

Density of a gas is found to be `5.46//dm^(3)` at `27^(@)C` at 2 bar pressure What will be its density at `STP` ? .A. 3 gm/litB. 2 gm/litC. 1.5 gm/litD. 1 gm/lit

Van Arkel method of purification of metals involves conversion of metal to a : (A) Volatile stable compound (B) Volatile unstable compound (C) Non volatile stable compound (D) None of the above

Lens used : Convexuvf10 cm10 cm5 cm(1) What is the nature of the image ? (2) What is its magnification ?

Acid should be added to water, but not water to the acid. Why ?

Where are used the thermite process in daily life ?

Concentrated H2SO4 is diluted by adding drop by drop :(a) Water to acid with constant stirring(b) Acid to water with constant stirring(c) Water to acid followed by a base(d) Base to acid followed by cold water

The pH of acid rain is approximately :(a) 5.6(b) 6.4(c) 7.0(d) 7.9

Absence of tartaric acid in baking powder makes the taste of the cake bitter due to the presence of :(a) Sodium hydrogen carbonate(b) Sodium carbonate(c) Sodium metabisulphite(d) Sodium sulphate

Why is tartaric acid added in baking powder?

Density of a gas is found to be `5.46//dm^(3)` at `27^(@)C` at 2 bar pressure What will be its density at `STP` ? .

The resistance of the wire is in the inverse ratio of ____________.1. Temperature2. Resistivity3. Length4. Cross-section area

A sound source sends waves of frequency 400 Hz and 2.5 m wavelength. What will be the speed of sound waves?1. 1000 m / s2. 10000 m / s3. 100 m / s4. 10 m / s

1 kWh = ______ J.1. 360002. 360000003. 3600004. 3600000

Which gas is called super halogen?

Name the anhydride of perchloric acid.

Give the order of stability of hydrogen halides?

Which is corrosion resistant plastic of fluorine?

What is the shape of chlorne monoxide molecule?

The correct order of acidic nature of the oxides of chlorine isA. `Cl_(2)O lt ClO_(2) lt Cl_(2)O_(6) lt Cl_(2)O_(7)`B. `ClO_(2) lt Cl_(2)O lt Cl_(2)O_(6) lt Cl_(2)O_(7)`C. `Cl_(2)O lt ClO_(2) lt Cl_(2)O_(7) lt Cl_(2)O_(6)`D. `Cl_(2)O_(7) lt Cl_(2)O_(6) lt ClO_(2) lt Cl_(2)O`

Volume (in ml) of 0.7 M NaOH required for complete reaction with 350 ml of o.3 M `H_(3) PO_(3)` solution isA. 300 mlB. 450 mlC. 150mlD. 350ml

In which of the following reactions, `H_(2)O_(2)` acts as a reducing agent ?A. `2MnO_(4)^(2-)+6H^(+)+5H_(2)Orarr 2Mn^(2)+8H_(2)O+5O_(2)`B. `I_(2)+H_(2)O_(2)+2OH^(-)rarr2I^(-)+2H_(2)O+O_(2)`C. `2MnO_(4)^(-)+3H_(2)O_(2)rarr2MnO_(2)+3O_(2)+2H_(2)O`D. All of these

The correct order of ionic radii isA. `Ca^(2+) gt K^(+) gt Cl^(-) gt S^(2-)`B. `Cl^(-) gt S^(2-) gt K^(+) gt Ca^(2+)`C. `K^(+) gt Ca^(2+) gt S^(2-) gt Cl^(-)`D.

Which of the following compound is heterocyclic compound ?A. B. C. D.

The rate of effusion of a particular gas whas measured to be 40ml/min. Under same condition the rate of effusion of pure methane was 20ml/min. Then find molar mass of gas.A. 4amuB. 2amuC. 4gmD. 2gm

Which compound is not smallest member of their corresponding homologous series ?A. AcetoneB. AcetyleneC. Acetic acidD. Ethyne

For following decomposition: `N_(2)O_(4)(g)rarr2NO_(2)(g)` Calculate vapour density of mixture at a time when `20%` of `N_(2)O_(4)` has been dissociated. (Assume initially only `N_(2)O_(4)` were present)A. 110B. 92C. 76.67D. 38.33

Which of the following is correct IUPAC name ?A. 3,3-Dimethyl butaneB. Ethoxy methaneC. 4-Bromo-1-fluoro-2,3-epoxybutaneD. Propanone

In reaction `CaF_(2)+H_(2)SO_(4)rarrCaSO_(4)+2HF` 6kg of `CaF_(2)` are treated with an excess of `H_(2)SO_(4)` and yield 2.0kg of HF. Percentage yield of reaction is:A. 0.5B. 0.39C. 0.65D. 0.79

In which one of the following pairs of oxides, both oxides behave as amphoteric oxides ?A. `Cl_(2)O_(7), As_(2)O_(3)`B. `Al_(2)O_(3), As_(2)O_(3)`C. `Al_(2)O_(3), Cl_(2)O_(3)`D. `Cl_(2)O_(7), SO_(3)`

Degree of unstaturation for A. 5B. 6C. 7D. 8

Which of the following represent pair of homologue.A. B. C. D.