100525 + Interview Questions in GENERAL QA IN GENERAL AWARENESS

1.	How many moles of Cu will be deposited by passing 24125 coulombs of electric current from CuSO4 solution?
Answer» Cu⁺⁺ + 2e → cu 2 x 96500 = 1 mole Change 2 x 96500 columb Cu heated on = 1 mole 24125 columb change Cu on 1 mole = {(24125)/(2 x 96500)} = 0.125 mole

1.

How many moles of Cu will be deposited by passing 24125 coulombs of electric current from CuSO4 solution?

Answer»

Cu⁺⁺ + 2e → cu

2 x 96500 = 1 mole

Change 2 x 96500 columb Cu heated on = 1 mole

24125 columb change Cu on

1 mole = {(24125)/(2 x 96500)} = 0.125 mole

Discussion

2.	In the alumino-thermite process, Al acts as :A. fluxB. oxidising agentC. reducing agentD. solder
Answer» Correct Answer - C In aluminothermite process aluminium acts as a reducing agent .

Discussion

3.	The incorrect statement among the following isA. Hydrogen is used to reduce NiOB. Zirconium is refined by van-Arkel methodC. The sulphide ore galena is concentrated by froth floatationD. In the metallurgy of iron , the flux used in `SiO_(2)`
Answer» Correct Answer - D CaO acts as a flux as it combines with silica present as an impurity (gangue) to form a fusible slag , `CaSiO_(3)` .

Discussion

4.	In electrometallury of aluminium , what will happen if graphite rodes are not used as anode and are replaced by some other metal ?A. `O_(2)` liberated at node will react with aluminium to give back `Al_(2)O_(3)`B. `F_(2)` will be liberated at anode instead of `O_(2)`C. The process of electrometallurgy will become non-spontaneousD. Aluminium oxide splits into `Al^(3+)` and `O^(2-)` ions only in presence of graphite
Answer» Correct Answer - A If some other metal is used as the anode other than graphite then the oxygen liberated at anode will convert some Al to `Al_(2)O_(3)`.

Discussion

5.	Which of the following is not as antiseptic compound?A. Boric acidB. lodoformC. Hydrogen peroxideD. Potassium sulphite
Answer» Correct Answer - D Boric acid, iodoform, hydrogen peroxide, alcohol, formaldehyde are some commonly used antiseptics whi le potassium sulphite is used as a food preservative.

Discussion

6.	Which among the following is strongest reducing agent?A. `AsH_(3)`B. `BiH_(3)`C. `PH_(3)`D. `SbH_(3)`
Answer» Correct Answer - B Among the given hydrides of group 15 elements, `BiH_(3)` is the strongest reducing agent. This is because as we move down the group, bond dissociation enthalpy decreases and thus reducing character increases. Hence, the order is `NH_(3)ltPH_(3)ltAsH_(3)ltSbH_(3)ltBiH_(3)`

Discussion

7.	Write chemical reactions taking place in the extracion of Aluminium from Bauxite ore .A. The concentration of ore is done by gravity separation method.B. molten mixture of aluminium oxide, cryolite or fluorspar is electrolysedC. impure aluminium is refined by liquationD. molten aluminium is obtained at cathode while fluorine is liberated at anode.
Answer» Correct Answer - B Purified `Al_(2)O_(3)` is mixed with `Na_(3)AlF_(6)` and `CaF_(2)` to improve conductivity of `Al_(2)O_(3)` and to lower than melting point. `Al_(2)O_(3) overset("electrolysis")to 2Al^(3+) + 3O^(2-)` At cathode `: AL^(3+)+3e^(-) to Al` At anode :` C + O^(2-) to CO + 2e^(-) ` `C+2O^(2-) to CO_(2) + 4e^(-)`

Discussion

8.	The metallurgical process in which a metal is obtained in a fused state is calledA. smeltingB. roastingC. calcinationD. froth floatation
Answer» Correct Answer - A The process in which metal is obtained in fused state is called smelting .

Discussion

9.	Among the following , which is the strongest oxidizing agent?(A) Mn3+(B) Fe3+(C) Ti3+(D) Cr3+
Answer» Correct option is (A) Mn³⁺ Strongest oxidising agent have highest reduction potential value \(E_{Mn^{+3}/Mn^{+2}}^0=1.51V(highest)\)

9.

Among the following , which is the strongest oxidizing agent?(A) Mn3+(B) Fe3+(C) Ti3+(D) Cr3+

Answer»

Correct option is (A) Mn³⁺

Strongest oxidising agent have highest reduction potential value

\(E_{Mn^{+3}/Mn^{+2}}^0=1.51V(highest)\)

Discussion

10.	Strongest oxidising agent among the following is: (1) Ti3+(2) Cr3+(3) Fe3+(4) Mn2+
Answer» Correct option is (3) Fe³⁺ Oxidising agent gets reduced. Most stable oxidation state of Ti → +4; Cr → +3; Fe → +2; Mn → +2 (acidic medium), 4(basic medium)

10.

Strongest oxidising agent among the following is: (1) Ti3+(2) Cr3+(3) Fe3+(4) Mn2+

Answer»

Correct option is (3) Fe³⁺

Oxidising agent gets reduced.

Most stable oxidation state of Ti → +4; Cr → +3; Fe → +2; Mn → +2 (acidic medium), 4(basic medium)

Discussion

11.	The metallurgical process in which a metal is obtained in a fused state is calledA. an oxidising agentB. a reducing agentC. acidic fluxD. basic flux
Answer» Correct Answer - B Metals Like Al, Na , K, Mg act as reducing agents in metallurgical processes.

Discussion

12.	Mark the incorrect statement.A. Copper is extracted by smelting in a reverberatory furnace.B. Zinc is extracted by reduction of oxide with aluminium .C. Aluminium is extracted by electrolysis of its oxide.D. Iron is extracted by reduction of its oxide in blast furnace.
Answer» Correct Answer - B Zice is extracted by reduction of oxide with coke.

Discussion

13.	The metal that cannot be produced on reduction of its oxide by aluminium is :-A. CrB. MnC. FeD. Mg
Answer» Correct Answer - D Since reduction potential of Al is more than that of Mg and less than other given metals. So its cannot reduce Mg from its oxide.

Discussion

14.	Identify the products formed when 1 mL of dil. Hydrochloric acid is added to 1g of Sodium metal?
Answer» Sodium Chloride and Hydrogen gas

Discussion

15.	Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
Answer» When an acid react with a metal, it liberates hydrogen gas. For example: Zn(s) + 2HCl(aq.) → ZnCl₂(aq.) + H₂(g) To test the presence of H₂ gas, bring a burning splinter near the mouth of the test tube where H₂ gas is released, the splinter burns with a pop sound. Hydrogen gas is usually liberated when an acid reacts with metal . Eg . Na (s) + HCL(aq) ----> NaCl (aq) + H₂(g)

15.

Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

Answer»

When an acid react with a metal, it liberates hydrogen gas.

For example:

Zn(s) + 2HCl(aq.) → ZnCl₂(aq.) + H₂(g)

To test the presence of H₂ gas, bring a burning splinter near the mouth of the test tube where H₂ gas is released, the splinter burns with a pop sound.

Hydrogen gas is usually liberated when an acid reacts with metal .

Eg . Na (s) + HCL(aq) ----> NaCl (aq) + H₂(g)

Discussion

16.	Which gas is usually liberated when and acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
Answer» Metal + Acid → Salt + H₂ ↑ Zn + 2HCl → ZnCl₂ + H₂ On putting burning match stick near mouth of test tube liberated gas burn with pop sound.

16.

Which gas is usually liberated when and acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

Answer»

Metal + Acid → Salt + H₂ ↑

Zn + 2HCl → ZnCl₂ + H₂

On putting burning match stick near mouth of test tube liberated gas burn with pop sound.

Discussion

17.	a). Rate constant k for first order reaction has been found to be 2.54 x 10‐3 s‐1 . Calculate its three fourth life. b). A reaction is first order in A and second order in B. (i) Write the differential rate equation. (ii) How is the rate affected on increasing the concentration of B three times? (iii) How is the rate affected when the concentrations of both A and B are doubled?
Answer» (a) k = \(\frac{2.303}{t}\) log \(\frac{[R]_o}{[R]}\) For three-forth of the reaction to take place, [R] = \(\frac{[R]_o}{[4]}\) or \(\frac{[R]_o}{[R]}\) = 4 Substituting the vale in the rate equation, we have 2.54 x 10^-3 = \(\frac{2.303}{t}\)log 4 or t = \(\frac{2.303}{2.54}\) x 10³ x 0.6021 = 5.46 x 10²s b) (i) dx/dt = k [A][B]² (ii) 9 times (iii) 8 times

17.

a). Rate constant k for first order reaction has been found to be 2.54 x 10‐3 s‐1 . Calculate its three fourth life. b). A reaction is first order in A and second order in B. (i) Write the differential rate equation. (ii) How is the rate affected on increasing the concentration of B three times? (iii) How is the rate affected when the concentrations of both A and B are doubled?

Answer»

(a) k = \(\frac{2.303}{t}\) log \(\frac{[R]_o}{[R]}\)

For three-forth of the reaction to take place,

[R] = \(\frac{[R]_o}{[4]}\) or \(\frac{[R]_o}{[R]}\) = 4

Substituting the vale in the rate equation, we have

2.54 x 10^-3 = \(\frac{2.303}{t}\)log 4

or t = \(\frac{2.303}{2.54}\) x 10³ x 0.6021 = 5.46 x 10²s

b) (i) dx/dt = k [A][B]²

(ii) 9 times

(iii) 8 times

Discussion

18.	Which of the following has minimum freezing pointA. 0.1 M `K_(2)Cr_(2)O_(7)`B. 0.1 M `NH_(4)CI`C. 0.1 M `BaSO_(4)`D. 0.1 M `Al_(2)(SO_(4))_(3)`
Answer» Correct Answer - D ic is max for `Al_(2)(SO_(4))_(3)` `:.` min f.P. is for option (4)

Discussion

19.	The correct expression for Arrehenius equation :-A. `lnk=lnA-(E)/(RT)`B. `Ke^(-E//RT)=A`C. log k=log A `-2.303(E)/(RT)`D. `K=A^(-1)e^(-E//RT)`
Answer» Correct Answer - A `K=_(Ae)(Ea)/(RT)` `In " K" =In" A"-(Ea)/(RT)`

Discussion

20.	NaH is an example of : (1) electron-rich hydride (2) metallic hydride (3) molecular hydride (4) saline hydride
Answer» The correct option is (4) saline hydride. Explanation: Ionic or saline hydrides are stoichiometric compound of dihydrogen formed with most of the s-block elements which are highly electropositive in character eg --> NaH.

20.

NaH is an example of : (1) electron-rich hydride (2) metallic hydride (3) molecular hydride (4) saline hydride

Answer»

The correct option is (4) saline hydride.

Explanation:

Ionic or saline hydrides are stoichiometric compound of dihydrogen formed with most of the s-block elements which are highly electropositive in character eg --> NaH.

Discussion

21.	Which of the following carbonates do not evolve CO2 on heating ? (A) Li2CO3 (B) MgCO3 (C) Na2CO3 (D) K2CO3
Answer» Correct option (C,D) Explanation: Carbonate of Na and K are highly stable on heating.

21.

Which of the following carbonates do not evolve CO2 on heating ? (A) Li2CO3 (B) MgCO3 (C) Na2CO3 (D) K2CO3

Answer»

Correct option (C,D)

Explanation:

Carbonate of Na and K are highly stable on heating.

Discussion

22.	The standard bleaching powder contains about : (A) 30 percent of active chlorine (B) 35 percent of active chlorine (C) 40 percent of active chlorine (D) 50 percent of active chlorine
Answer» Correct option (B) 35 percent of active chlorine Explanation: The standard bleaching powder contains 35% of active chlorine.

22.

The standard bleaching powder contains about : (A) 30 percent of active chlorine (B) 35 percent of active chlorine (C) 40 percent of active chlorine (D) 50 percent of active chlorine

Answer»

Correct option (B) 35 percent of active chlorine

Explanation:

The standard bleaching powder contains 35% of active chlorine.

Discussion

23.	The substance which is likely to contain CaCO3 is : (A) Sea shells (B) Dolomite (C) Marble statue (D) Calcined gypsum
Answer» Correct option (A,B,C) Explanation: Sea shells, dolomite and marble statue contains CaCO₃.

23.

The substance which is likely to contain CaCO3 is : (A) Sea shells (B) Dolomite (C) Marble statue (D) Calcined gypsum

Answer»

Correct option (A,B,C)

Explanation:

Sea shells, dolomite and marble statue contains CaCO₃.

Discussion

24.	Which of the following statement is incorrect about the give energy profile diagram.(1) C is thermodynamically most stable (2) D is kinetically most stable(3) Activation energy for making A + B from C is the maximum (4) Enthalpy to from C is 5 kJ less than to that to form D.
Answer» Correct option (4) Enthalpy to from C is 5 kJ less than to that to form D. Explanation: E_D - E_C = 15 -5 = 10 kJ/mol

24.

Which of the following statement is incorrect about the give energy profile diagram.(1) C is thermodynamically most stable (2) D is kinetically most stable(3) Activation energy for making A + B from C is the maximum (4) Enthalpy to from C is 5 kJ less than to that to form D.

Answer»

Correct option (4) Enthalpy to from C is 5 kJ less than to that to form D.

Explanation:

E_D - E_C = 15 -5 = 10 kJ/mol

Discussion

25.	Sodium hydroxide is manufacture by the electrolysis of brine solution. The reaction by `-` products are `:`A. `Cl_2` and `H_2`B. `Cl_2` and `Na-Hg`C. `Cl_2` and NaClD. `Cl_2` and `O_2`
Answer» Correct Answer - A `NaCl(conc.)hArr Na^(+)+Cl^(-)` `H_2O hArr H^(+)+OH^(-)` At cathode : `2H^(+)+2e^(-)toH_2 uarr` At anode: `2Cl^(-)toCl_2 uarr +2e^(-)` `Na^(+) + OH^(-) to NaOH`

Discussion

26.	Which of the following donot give Cannizzaro reaction ?A. B. C. D.
Answer» Correct Answer - 3 Due to good LG Nature of `C"C"l_(3)^(Θ)`

Discussion

27.	In the reaction `:Cl_(2)+OH^(-)rarrCl^(-)+ClO_(4)^(-)+H_(2)O` :-A. Chlorine is oxidisedB. Chlorine is reducedC. Chlorine is oxidised as well as reducedD. Chlorine is neither oxidised nor reduced
Answer» Correct Answer - C

Discussion

28.	Which graph represents correct for boiling point of:- (1) Ethane (2) Ethyl alcohol (3) Acetic AcidA. B. C. D.
Answer» Correct Answer - A

Discussion

29.	Catenation power order is `GeltSiltC` then `C-C,Si-Si` and `Ge-Ge` bond energies are respectively (in kJ/mole):-A. 170,180,350B. 180,170,350C. 350,170,180D. 350,180,170
Answer» Correct Answer - D

Discussion

30.	In C, Si, Ge and Sn the decreasing order of catenation is(1) C > Si > Ge = Sn(2) C > Si > Sn Ge(3) C > Sn Ge > Si(4) C > Ge > Si > Sn
Answer» The correct option (1) C > Si > Ge = Sn Explanation: The decreasing order of catenation

30.

In C, Si, Ge and Sn the decreasing order of catenation is(1) C > Si > Ge = Sn(2) C > Si > Sn Ge(3) C > Sn Ge > Si(4) C > Ge > Si > Sn

Answer»

The correct option (1) C > Si > Ge = Sn

Explanation:

The decreasing order of catenation

Discussion

31.	Then choose the correct statement:-A. A:LaB. B:SeC. E:HfD. All are incorrect
Answer» Correct Answer - D

Discussion

32.	Which of the following statements is correct:A. IP of `X_((g))gtE.A` of `X_((g))`B. IP of `X_((g))gtIP` of `X_((g))`C. IP of `X_((g))^(+)IP` of `X_((g))`D. All are correct.
Answer» Correct Answer - D

Discussion

33.	Select that pairs in which bond angle of first member is higher than second one.A. `BrO_3^(-), CrO_3^(-)`B. `Asl_3, Sbl_3`C. `SbBr_3, SbI_3`D. `NF_3, NH_3`
Answer» Correct Answer - B (A)The bond angle decreases with decrease in electronegativies and increase in size of central atom. Hence the correct order of O-X-O bond angle is `CiO_3^(-) gt BrO_3^(-)` `{:(,CIO_3^(-),107^(@),BrO_3^(-),104^@),((B),AsI_3,100.2^@ ,Sbl_3,90^@),(( C),SbBr_3,98.2^@,Sbl_3,99^@),((D),NH_3 , 106.6^@ ,NF_3,102.2^@):}`

Discussion

34.	In which pairs is are the stronger bond found in the first species ?A. `O_2^(-), O_2`B. `N_2, N_2^(+)`C. `NO^(+), NO^(-)`D. `CO, O_2^(2+)`
Answer» Correct Answer - BC Bond order : (A)`O_2^(-)=(10-7)//2=105,O_2=(10-6)//2=2` (B)`N_2=(10-4)//2=3,N_2^+ =(9-4)//2=2.5` ( C)`NO^+ =(10-4)//2=3, NO^(-) =(10-6)//2=2` ( D)`CO=(10-4)//2=3,O_2^(2+)=(10-4)//2=3`

Discussion

35.	In which of the following pairs, the hybridisation of the central atoms in same ?A. `CIF_3, CIF_3O`B. `CIF_3O, CIF_3O_2`C. `(CIF_2O)^(+), (CIF_4O)^(-)`D. `(CIF_4O)^(-) (XeOF_4)`
Answer» Correct Answer - A,B,D Steric number of `CIF_3 =3+2=5(sp^3d)` Steric number of `CIF_3O =4+1=5(sp^3d)` Steric number of `CIF_3O_2 =5+0=5(sp^3d)` Steric number of `CIF_2O^(+) =3+1=4(sp^3)` Steric number of `CIF_4O^(-) =5+1=6(sp^3d^2)` Steric number of `XeOF_4 =5+1=6(sp^3d^2)`

Discussion

36.	The only correct combination that gives red ppt. is :A. (I)(i)(R)B. (III)(ii)(R)C. (II)(i)(Q)D. (I)(iii)(R)
Answer» Correct Answer - D All reducing sugars give red ppt with Fehling solution Sucrose is non reducing sugar

Discussion

37.	For the synthesis of Laevorotatory solution, the only correct combination is :A. (IV)(iv)(Q)B. (II)(iii)(S)C. (III)(ii)(P)D. I(iii)(S)
Answer» Correct Answer - C On hydrolysis with dilute acids sucrose yields an equimolar mixture of D(+) Glucose and D(-) Fructose. Since D(-) Fructose has a greater specific rotation than D(+) Glucose, the resulting mixture is laevorotatory.

Discussion

38.	Decreasing order of melting point of compound I-IV follows: A. IVgtIIIgtIIgtIB. IgtIIgtIIIgtIVC. IIgtIIIgtIVgtID. IIgtIVgtIIIgtI
Answer» Correct Answer - A Melting point depends on symmetry of molecule.

Discussion

39.	Which of the following compounds undergoes mucleophilic substitution reaction most easily?A. B. C. D.
Answer» Correct Answer - A

Discussion

40.	The corret order of increasing basicity of the given conjugated bases `(R=CH_(3))` is :A. `RCOO^(-)ltHC-=C^(-)ltNH_(2)^(-)ltR^(-)`B. `RCOO^(-)ltHC-=C^(-)ltR^(-)ltNH_(2)^(-)`C. `R^(-)ltHC-=C^(-)ltRCOO^(-)ltNH_(2)^(-)`D. `RCOO^(-)ltNH_(2)^(-)ltHC-=C^(-)ltR^(-)`
Answer» Correct Answer - A

Discussion

41.	Which of the following is correct for stability of phenoxide ion?A. Resonating structure of benzene ringB. Localization of `pi`-electrons in phenoxide ionC. Delocalization of `pi`-electrons in phenoxide ionD. All of the above
Answer» Correct Answer - C

Discussion

42.	Which of the following is a free radical substitution reaction?A. `CH_(3)CHO+HCNrarrCH_(3)CH(OH)CN`B. C. D.
Answer» Correct Answer - D

Discussion

43.	Choose the correct alternative:1. When a conservative force does positive work on a body, the potential energy of the body increases/ decreases/remains unaltered.2. Work done by a body against friction always results in a loss of its kinetic/potential energy.3. The rate of change of total momentum of a many particle system is proportional to the external force/sum of the internal forces on the system.4. In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy/total linear momentum/ total energy of the system of two bodies.
Answer» 1. decreases 2. kinetic energy 3. external force 4. total linear momentum and also total energy (if the system of two bodies is isolated).

43.

Choose the correct alternative:1. When a conservative force does positive work on a body, the potential energy of the body increases/ decreases/remains unaltered.2. Work done by a body against friction always results in a loss of its kinetic/potential energy.3. The rate of change of total momentum of a many particle system is proportional to the external force/sum of the internal forces on the system.4. In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy/total linear momentum/ total energy of the system of two bodies.

Answer»

1. decreases

2. kinetic energy

3. external force

4. total linear momentum and also total energy (if the system of two bodies is isolated).

Discussion

44.	The potential energy function for a particle executing linear simple harmonic motion is given byV(x) = \(\frac{kx^2}{2}\), where k is the force constant of the oscillator, For k = 0.5N nm-1, the graph of V(x) versus x is shown. Show that a particle of total energy 1 J moving under this potential must ‘turn back’ when it reaches x = ± 2m.
Answer» We know that maximum potential energy = total energy ∴ (\(\frac{1}{2}\)kx²) max = 1 joule or \(\frac{1}{2}\) × 0.5 × (x²)_max = 1 or (x²)_max = 4 or (x)_max = ± 2m.

44.

The potential energy function for a particle executing linear simple harmonic motion is given byV(x) = \(\frac{kx^2}{2}\), where k is the force constant of the oscillator, For k = 0.5N nm-1, the graph of V(x) versus x is shown. Show that a particle of total energy 1 J moving under this potential must ‘turn back’ when it reaches x = ± 2m.

Answer»

We know that maximum potential energy = total energy

∴ (\(\frac{1}{2}\)kx²) max = 1 joule or \(\frac{1}{2}\) × 0.5 × (x²)_max = 1

or (x²)_max = 4 or (x)_max = ± 2m.

Discussion

45.	When is the exchange of energy is maximum during an elastic collision?
Answer» When mass of two colliding bodies are same, there will be maximum exchange of energy.

Discussion

46.	Find the odd one out and find the relation connecting the remaining quantities. Joule, Calorie, Kilowatt, electron volt.
Answer» kilowatt, unit of power 1 calorie = 4.2 joule 1 electron volt = 1.6 × 10^-19J.

46.

Find the odd one out and find the relation connecting the remaining quantities. Joule, Calorie, Kilowatt, electron volt.

Answer»

kilowatt, unit of power

1 calorie = 4.2 joule

1 electron volt = 1.6 × 10^-19J.

Discussion

47.	If the Sum of three. numbers of an arithmetic sequence és 15 and the sum of their squares is then the numbers are 83, (a) 4,5,6
Answer» Let a-d, a, a+d are the three numbers. Then sum = a-d+a+a+d = 15 3a = 15 a = 5 Sum of squares, (a-d)²+a²+(a+d)² = 83 a²-2ad+d²+a²+a²+2ad+d² = 83 3a²+2d²= 83 Substitute a = 5 75+2d² = 83 2d² = 8 d² = 4 So d = 2 Then the numbers are 3, 5, 7.

47.

If the Sum of three. numbers of an arithmetic sequence és 15 and the sum of their squares is then the numbers are 83, (a) 4,5,6

Answer»

Let a-d, a, a+d are the three numbers.

Then sum = a-d+a+a+d = 15

3a = 15

a = 5

Sum of squares, (a-d)²+a²+(a+d)² = 83

a²-2ad+d²+a²+a²+2ad+d² = 83

3a²+2d²= 83

Substitute a = 5

75+2d² = 83

2d² = 8

d² = 4

So d = 2

Then the numbers are 3, 5, 7.

Discussion

48.	Why is kinetic energy not conserved in elastic collision of billiard balls, colliding for a short interval
Answer» In reality, examples of perfectly elastic collisions are not part of our everyday experience. However, there are some examples of collisions in mechanics where the energy lost can be negligible. These collisions can be considered elastic, even though they are not perfectly elastic. Collisions of rigid billiard balls or the balls leads to negligible amount of energy. Hence, Kinetic energy is not conserved.

48.

Why is kinetic energy not conserved in elastic collision of billiard balls, colliding for a short interval

Answer»

In reality, examples of perfectly elastic collisions are not part of our everyday experience. However, there are some examples of collisions in mechanics where the energy lost can be negligible. These collisions can be considered elastic, even though they are not perfectly elastic.

Collisions of rigid billiard balls or the balls leads to negligible amount of energy. Hence, Kinetic energy is not conserved.

Discussion

49.	Two cricket balls are colliding each other.1. Name the collision2. Say whether law of conservation of Kinetic Energy hold good in this case. Why?3. State and prove the other conservation law applicable here.
Answer» 1. Inelastic collision 2. No, Total KE before collision is not equal to total KE after collision. 3. Proof and statement of law of conservation of momentum.

49.

Two cricket balls are colliding each other.1. Name the collision2. Say whether law of conservation of Kinetic Energy hold good in this case. Why?3. State and prove the other conservation law applicable here.

Answer»

1. Inelastic collision

2. No, Total KE before collision is not equal to total KE after collision.

3. Proof and statement of law of conservation of momentum.

Discussion

50.	What is the type of collision when macroscopic particles collide?
Answer» Perfectly inelastic collision when macroscopic particles collide.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

How many moles of Cu will be deposited by passing 24125 coulombs of electric current from CuSO4 solution?

In the alumino-thermite process, Al acts as :A. fluxB. oxidising agentC. reducing agentD. solder

The incorrect statement among the following isA. Hydrogen is used to reduce NiOB. Zirconium is refined by van-Arkel methodC. The sulphide ore galena is concentrated by froth floatationD. In the metallurgy of iron , the flux used in `SiO_(2)`

Which of the following is not as antiseptic compound?A. Boric acidB. lodoformC. Hydrogen peroxideD. Potassium sulphite

Which among the following is strongest reducing agent?A. `AsH_(3)`B. `BiH_(3)`C. `PH_(3)`D. `SbH_(3)`

The metallurgical process in which a metal is obtained in a fused state is calledA. smeltingB. roastingC. calcinationD. froth floatation

Among the following , which is the strongest oxidizing agent?(A) Mn3+(B) Fe3+(C) Ti3+(D) Cr3+

Strongest oxidising agent among the following is: (1) Ti3+(2) Cr3+(3) Fe3+(4) Mn2+

The metallurgical process in which a metal is obtained in a fused state is calledA. an oxidising agentB. a reducing agentC. acidic fluxD. basic flux

Mark the incorrect statement.A. Copper is extracted by smelting in a reverberatory furnace.B. Zinc is extracted by reduction of oxide with aluminium .C. Aluminium is extracted by electrolysis of its oxide.D. Iron is extracted by reduction of its oxide in blast furnace.

The metal that cannot be produced on reduction of its oxide by aluminium is :-A. CrB. MnC. FeD. Mg

Identify the products formed when 1 mL of dil. Hydrochloric acid is added to 1g of Sodium metal?

Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

Which gas is usually liberated when and acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

Which of the following has minimum freezing pointA. 0.1 M `K_(2)Cr_(2)O_(7)`B. 0.1 M `NH_(4)CI`C. 0.1 M `BaSO_(4)`D. 0.1 M `Al_(2)(SO_(4))_(3)`

The correct expression for Arrehenius equation :-A. `lnk=lnA-(E)/(RT)`B. `Ke^(-E//RT)=A`C. log k=log A `-2.303(E)/(RT)`D. `K=A^(-1)e^(-E//RT)`

NaH is an example of : (1) electron-rich hydride (2) metallic hydride (3) molecular hydride (4) saline hydride

Which of the following carbonates do not evolve CO2 on heating ? (A) Li2CO3 (B) MgCO3 (C) Na2CO3 (D) K2CO3

The standard bleaching powder contains about : (A) 30 percent of active chlorine (B) 35 percent of active chlorine (C) 40 percent of active chlorine (D) 50 percent of active chlorine

The substance which is likely to contain CaCO3 is : (A) Sea shells (B) Dolomite (C) Marble statue (D) Calcined gypsum

Which of the following statement is incorrect about the give energy profile diagram.(1) C is thermodynamically most stable (2) D is kinetically most stable(3) Activation energy for making A + B from C is the maximum (4) Enthalpy to from C is 5 kJ less than to that to form D.

Sodium hydroxide is manufacture by the electrolysis of brine solution. The reaction by `-` products are `:`A. `Cl_2` and `H_2`B. `Cl_2` and `Na-Hg`C. `Cl_2` and NaClD. `Cl_2` and `O_2`

Which of the following donot give Cannizzaro reaction ?A. B. C. D.

In the reaction `:Cl_(2)+OH^(-)rarrCl^(-)+ClO_(4)^(-)+H_(2)O` :-A. Chlorine is oxidisedB. Chlorine is reducedC. Chlorine is oxidised as well as reducedD. Chlorine is neither oxidised nor reduced

Which graph represents correct for boiling point of:- (1) Ethane (2) Ethyl alcohol (3) Acetic AcidA. B. C. D.

Catenation power order is `GeltSiltC` then `C-C,Si-Si` and `Ge-Ge` bond energies are respectively (in kJ/mole):-A. 170,180,350B. 180,170,350C. 350,170,180D. 350,180,170

In C, Si, Ge and Sn the decreasing order of catenation is(1) C &gt; Si &gt; Ge = Sn(2) C &gt; Si &gt; Sn Ge(3) C &gt; Sn Ge &gt; Si(4) C &gt; Ge &gt; Si &gt; Sn

Then choose the correct statement:-A. A:LaB. B:SeC. E:HfD. All are incorrect

Which of the following statements is correct:A. IP of `X_((g))gtE.A` of `X_((g))`B. IP of `X_((g))gtIP` of `X_((g))`C. IP of `X_((g))^(+)IP` of `X_((g))`D. All are correct.

Select that pairs in which bond angle of first member is higher than second one.A. `BrO_3^(-), CrO_3^(-)`B. `Asl_3, Sbl_3`C. `SbBr_3, SbI_3`D. `NF_3, NH_3`

In which pairs is are the stronger bond found in the first species ?A. `O_2^(-), O_2`B. `N_2, N_2^(+)`C. `NO^(+), NO^(-)`D. `CO, O_2^(2+)`

In which of the following pairs, the hybridisation of the central atoms in same ?A. `CIF_3, CIF_3O`B. `CIF_3O, CIF_3O_2`C. `(CIF_2O)^(+), (CIF_4O)^(-)`D. `(CIF_4O)^(-) (XeOF_4)`

The only correct combination that gives red ppt. is :A. (I)(i)(R)B. (III)(ii)(R)C. (II)(i)(Q)D. (I)(iii)(R)

For the synthesis of Laevorotatory solution, the only correct combination is :A. (IV)(iv)(Q)B. (II)(iii)(S)C. (III)(ii)(P)D. I(iii)(S)

Decreasing order of melting point of compound I-IV follows: A. IVgtIIIgtIIgtIB. IgtIIgtIIIgtIVC. IIgtIIIgtIVgtID. IIgtIVgtIIIgtI

Which of the following compounds undergoes mucleophilic substitution reaction most easily?A. B. C. D.

The corret order of increasing basicity of the given conjugated bases `(R=CH_(3))` is :A. `RCOO^(-)ltHC-=C^(-)ltNH_(2)^(-)ltR^(-)`B. `RCOO^(-)ltHC-=C^(-)ltR^(-)ltNH_(2)^(-)`C. `R^(-)ltHC-=C^(-)ltRCOO^(-)ltNH_(2)^(-)`D. `RCOO^(-)ltNH_(2)^(-)ltHC-=C^(-)ltR^(-)`

Which of the following is correct for stability of phenoxide ion?A. Resonating structure of benzene ringB. Localization of `pi`-electrons in phenoxide ionC. Delocalization of `pi`-electrons in phenoxide ionD. All of the above

Which of the following is a free radical substitution reaction?A. `CH_(3)CHO+HCNrarrCH_(3)CH(OH)CN`B. C. D.

When is the exchange of energy is maximum during an elastic collision?

Find the odd one out and find the relation connecting the remaining quantities. Joule, Calorie, Kilowatt, electron volt.

If the Sum of three. numbers of an arithmetic sequence és 15 and the sum of their squares is then the numbers are 83, (a) 4,5,6

Why is kinetic energy not conserved in elastic collision of billiard balls, colliding for a short interval

Two cricket balls are colliding each other.1. Name the collision2. Say whether law of conservation of Kinetic Energy hold good in this case. Why?3. State and prove the other conservation law applicable here.

What is the type of collision when macroscopic particles collide?

In C, Si, Ge and Sn the decreasing order of catenation is(1) C > Si > Ge = Sn(2) C > Si > Sn Ge(3) C > Sn Ge > Si(4) C > Ge > Si > Sn