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7101.

When potessium chloride is dissovled in water,

Answer»

ENTROPY INCREASES
entropy decreases
entropy increases and then decreases
free ENERGY increases

Answer :A
Discussion
7102.

What is the freezing point of a solution containing 8.1 g HBr in 100g water assuming the acid to be 90% ionised (K_(f) for water = 1.86 "Kg mole"^(-1))

Answer»

`0.85^(@)C`
`-3.53^(@)C`
`0^(@)C`
`-0.35^(@)C`

Solution :`{:(HBR,hArr,H^(+),+,Br^(-)),((1-ALPHA),,alpha,,alpha):}`
Total `= 1+alpha THEREFORE i=1+alpha=1+0.9=1.9`
`DELTA T_(f)= i K_(f)xx m=1.9xx1.86xx(8.1)/(81)xx(1000)/(100)=3.53^(@)C`
`T_(f)=-3.53^(@)C`.
Discussion
7103.

Zr and Zn have the same oxidation state +2. Size of lanthanoid decrease because of poor screening of

Answer»

4f
3d
5f
4d

Answer :A
Discussion
7104.

Which of the following solids is not an electrical conductor?

Answer»

`MG(s)`
`TiO(s)`
`I_(2)(s)`
`H_(2)O(s)`

Answer :C
Discussion
7105.

What structural unit makes detergents non-biodegradable ?

Answer»

SOLUTION :BRANCHING in the HYDROCARBON CHAIN
Discussion
7106.

The source of nitrogen in Gabriel synthesis of amines is_____

Answer»

Sodium azide, `NaN_(3)`
Sodium nitrite, `NaNO_(2)`
Potassium CYANIDE, KCN
Potassium phthalimide, `C_(6)H_(4)(CO)_(2)N^(-)K^(+)`

Solution :`C_(6)H_(4)(CO)_(2)N^(-)K^(+)`.
Discussion
7107.

What is a coupling reaction?

Answer»

SOLUTION :The REACTION of diazonium salts with phenols in basic MEDIUM (pH 9-10) and with `1^(@)` amines in acidic medium (pH 4-5) to GIVE the corresponding azo dyes is called the coupling reaction.
Discussion
7108.

Two containers of the same volume, one containing the gas A and the other containing the gas B, have the same number of molecules of each gas. The mass of the molecules A is twice the mass of the molecule B. The rms speed of A is also twice that of B. Calculate the pressure ratio of the gases A and B.

Answer»


ANSWER :`8:1`
Discussion
7109.

Which of the following complexes will show geometrical isomerism ?

Answer»

POTASSIUM tris(oxalato) CHROMATE (III)
Pentaaquchlorochromium(III)chloride
Aquachlorobis(ethylenediamine)COBALT(II) chloride
Potassium amminetrichloroplatinate(II)

ANSWER :C
Discussion
7110.

Which of the followin statements about Fe(CO)_(5) is correct ?

Answer»

It is paramagnetic and HIGH spin COMPLEX
It is DIAMAGNETIC and high spin complex
It is diamagnetic and low spin complex
It is paramagnetic and low spin complex

Solution :`[Foverset(0)(e)(CO)_(5)]d^(8)` config., `dsp^(3)` HYB. diamagnetic
Discussion
7111.

Which of the following statements is not true about high density polyethene ?

Answer»

Has high DENSITY due to close PACKING
Linear
Highly branched
Chemically inert

ANSWER :C
Discussion
7112.

What is the bond angle in the molecule of sulphur dioxide?

Answer»

SOLUTION :`119.5^@`
Discussion
7113.

Which of the following compounds can form a Zwitter ion ?

Answer»




ANSWER :C
Discussion
7114.

The same amount of electricity was passed through two cells containing molten Al_2O_3 and molten NaCI. If 1.8g of Al were liberated in one cell, the amonut of Na liberated in the other cell is :

Answer»

`4.6 G`
`2.3 g`
`6.4 g`
`3.2 g`

ANSWER :A
Discussion
7115.

You are an important leader of Farmers' agitation. The Government authorities ask you to present any two demands on behalf of the farmers. On priority basis, which three demands will you make? Support your demands with appropriate arguments.

Answer»

Solution :1.Higher government floor PRICES for FOOD and staple crop- due to effort
2. Abolition of restrictions on interstate movement of farm produce.
3.give electricity on subsidised rates
4.waive repayment of loans in a phased manner
5.provide health and PENSION benefits
6.Protect the Indian produce in the international market. Not have agriculture in purview of WTO
7. Danger of market CRISIS for cash crops.
any TWO)
Discussion
7116.

Which of the following cannot reduce Tollen's reagent?

Answer»

`HCCOH`
`HCHO`
`CH_3CHO`
`CH_3COOH`

ANSWER :D
Discussion
7117.

Which of the following statements is correct about the role of substances added in the froth floatation process ?

Answer»

Collectors enhance the non-wettability of the mineral particles.
Collectors enhance the wettability of gangue particles.
By using depressants in the process two sulphide ORES can be separated.
Froth stabilisers DECREASE wettability of gangue. 

Solution :Collectors like SODIUM ethyl xanthates enhances non-wettability of the mineral particles and depressants such as NCN helps to seperate two sulphide ores. For EXAMPLE ore CONTAINING Pbs and ZnS.
Discussion
7118.

Which alkane cannot be be produced using only one type of alkyl halide in Wurtz reaction?

Answer»

`CH_3-CH_3`
`Ch_3CH_2CH_2CH_3`
`CH_3CH_2CH_2CH_2CH_3`

ANSWER :C
Discussion
7119.

Which si tribasic acid

Answer»

ADIPIC ACID
succinic acid
TARTARIC acid
CITRIC acid

ANSWER :D
Discussion
7120.

The temperature in ""^(@) Cat STPconditions is :-

Answer»


ANSWER :25
Discussion
7121.

Which gas is used in refining petroleum and sugar ?

Answer»

SOLUTION :SULPHURDIOXIDE
Discussion
7122.

Which of the following reagents are used for detecting the presence of carbonyl group?

Answer»

`NH_(2)OH`
`NH_(2)NH_(2)`
`H_(2)NCONHNH_(2).HCL`
`C_(6)H_(5)NHNH_(2).HCl`

Answer :A::B::C::D
Discussion
7123.

Which of the following complex show maximum numbers of stereo isomers is :-

Answer»

`[PtCl_(3)(C_(2)H_(4))]^("ϴ")`
`[CuBr_(2)Cl_(2)]^(-2)`
`[Cr(NH_(3))_(2)(e N)_(2)]^(+3)`
`[Co(C_(2)O_(4))_(3)]^(-3)`

Answer :C
Discussion
7124.

Which of the following does not has an optical isomer?

Answer»

`[CO(EN)_2Cl_3]`
`[Co(en)_2Cl_2]CL`
`[Co(NH_3)_3Cl_3]`
`[Co(en)(NH_3)_2Cl_2]Cl`

ANSWER :C
Discussion
7125.

There are 14 elements in actinold series. Which of the following elements does not belong to this series?

Answer»

U
Np
Tm
Fm

Solution :THULIUM is LANTHANOID
Discussion
7126.

Which compound has oxidation number of carbon equal to zero ?

Answer»

`C_6H_6`
`CH_3`
`C_2H_4`
`C_6H_12O_6`

ANSWER :D
Discussion
7127.

The van der Waal's gas equation, the constant, b is a measure of

Answer»

Intermolecular repulsions
Intermolecular attractions
Volume OCCUPIED by the GAS molecules
Intermoleculer COLLISIONS perunit volume

Answer :C
Discussion
7128.

What are the factors which affect the vapour pressure of a solution?

Answer»

Solution : The vapour pressure of a solution depends on the FOLLOWING factors :
(1) Nature of the solvent : The LIQUID molecules have a tendency to evaporate and form vapour above the liquid surface. This tendency depends on the intermolecular forces.
The weaker are these intermolecular forces, more is the tendency of evaporation, and higher is the vapour pressure. These liquids are called volatile liquids. For example, alcohols, ethers, etc.
(2) Nature of the solute :
(a) Volatile solute : When a volatile solute like a volatile liquid is dissolved in another liquid solvent, the vapour pressure of the resulting solution is increased. e.g. Solution of an alcohol in water.
(B) Nonvolatile solute : When a nonvolatile solute like glucose is dissolved in a liquid like water, the vapour pressure is LOWERED.
(3) Concentration of a solution : As the concentration of a nonvolatile solute in the solution INCREASES, the vapour pressure decreases. If `P_(0)` and P are the vapour pressures of a pure solvent and a solution , then `P lt P_(0)` .
(4) Temperature : Asthe tempertureincrease , vapourpressue of a liquid increase. Thetempertureat whichthe vapourpressuebecomes equalto theexternalpressureof oneatmosphere,represents the boiling pointof the liquid.
Discussion
7129.

Whichof the followingis theprimary precursorof photochemicalsmog ?

Answer»

OZONE
PEROXYACETYL nitrate
`NO_(2)`
`CO_(2)`

ANSWER :C
Discussion
7130.

Which of the following pairs of compounds are more stable?

Answer»

`K_(2)[NiCl_(6)],[Pt(CN)_(4)]^(2-)`
`NiCl_(4),PtCl_(4)`
`[Ni(CN)_(4)]^(2-), K_(2)[PtCl_(6)]`
`PtCl_(2), NiCl_(2)`

Answer :C
Discussion
7131.

Triple bond of ethyne is made of

Answer»

THREE `SIGMA`-bonds
Three `pi`-bonds
Two `sigma` and ONE `pi`-bond
Two `pi` and one `sigma` -bond

Solution :In `CH-=CH` triple bond consists of one `sigma` and two `pi` bonds.
Discussion
7132.

Zn^(2+) salts are white while Cu^(2+) salts are coloured. Why ?

Answer»

Solution :`Cu^(2+)(3d^(9)4s^(0))` has one unpaired electron in d-subshell which absorbs RADIATION in visible region resulting in d-d transition and hence `Cu^(2+)` salts are COLOURED. `Zn^(2+)(3d^(10)4s^(0))` has completely FILLED d-orbitals. No radiation is absorbed for d-d transition and hence `Zn^(2+)` salts are colourless.
Discussion
7133.

Which one is the most likely structure of CrCl_(3).6H_(2)O if 2/3 of total chlorine of the compound is ppt. by adding AgNO_(3) to its aqueous solution :

Answer»

`CrCl_(3).6H_(2)O`
`[CrCl_(2)(H_(2)O)_(4)]CL.2H_(2)O`
`[CrCl(H_(2)O)_(5)]Cl_(2).H_(2)O`
`[CrCl_(3)(H_(2)O)_(3)].3H_(2)O`

ANSWER :C
Discussion
7134.

Which has maximum potential for the half cell reaction: 2H^(+)+2e^(-)toH_(2)?

Answer»

`1.0M` HCL
`1.0` M NaOH
Pure water
A solution with pH=4

Solution :For `2H^(+)+2e^(-)toH_(2)`,
`E=E^(@)-(0.0591)/(2)"log"(1)/([H^(+)]^(2))=0+(0.0591)/(2)log[H^(+)]^(2)`
`=0.591log[H^(+)]=-0.0591pH`
(a) `[H^(+)]=1M,E=0.0591log1=0`
(B) `[OH^(-)]=10^(0),[H^(+)]=10^(-14)=-0.827V`
`E=-0.0591xx14=-0.827V`
(c) `[H^(+)]=10^(-7),pH=7,E=-0.0591xx7`
`=0.413`V
(d) pH=4,E=-0.0591`xx4=0.236V`.
Thus, potential E is MAXIMUM for 1 M HCl.
Discussion
7135.

Which type of isomerism is shown by [Cr(H_(2)O)_(6)]Cl_(3) and [Cr(H_(2)O)_(5)Cl]Cl_(2).H_(2)O ?

Answer»

LINKAGE isomerism
Coordination isomerism
Solvate isomerism
Ionisation isomerism

Answer :C
Discussion
7136.

Which of the following salt is insoluble in water

Answer»

`CuSO_(4)`
`CdSO_(4)`
`PbSO_(4)`
`Bi_2(SO_(4))_(3)`

SOLUTION :`PbSO_(4)` is INSOLUBLE in water.
Discussion
7137.

Which of the following is true for the complex Co(NO_(2))(Cl)_(2).5NH_(3) (Co is in +III oxidation state)?

Answer»

It shows linkage isomerism
It show IONISATION isomerism
If is inner ORBITAL complex
It is diamagnetic.

Solution :`[Co(NH_(3))_(5)(NO_(2))] Cl_(2) " or "[Co(NH_(3))_(5)(ONO_(2))]Cl_(2) or [Co(NH_(3))_(5)Cl](NO_(2))(Cl)`
Discussion
7138.

Which noble gas havin the lowest atomic number

Answer»

Ne
He
Kr
Xe

Answer :B
Discussion
7139.

The substance which does not show sharp melting point is

Answer»

KCl
Glass
Plastic
DIAMOND.

Solution :Amorphous or non-crystalline solids do not have SHARP MELTING point.
Discussion
7140.

Which set of reagents are needed to synthesize the given unsymmetrical alkyne CH_3-C-=C-CH_2-CH_3 ?

Answer»

Acetaldyde , 1 - bromopropane and CONC.`H_2SO_4`
Ethyne , iodomethane , iodothane and sodamide
1,2 - DICHLOROETHANE , 1 - PROPANOL and alcoholic potassium hydroxide
Ethene , IODOETHANE , iodomethane and potassium hydroxide

ANSWER :B
Discussion
7141.

Which of the following is used as an antioxidant in foods?

Answer»

SACCHARIN
METHYLATED hydroxyanisole
ORMELOXIFENE
Cochinical

Answer :B
Discussion
7142.

What happens when a colloidal sol of Fe(OH)_3 is mixed with that of As_2S_3?

Answer»

Solution :`Fe(OH)_3` is a positively CHARGED sol and `As_2S_3` is a negatively charged sol. On mixing, their CHARGES GET NEUTRALIZED. Hence, their mutual coagulation occurs.
Discussion
7143.

Write suitable reagent used for the following conversions: CH_3-CH_2-Cl rarr CH_3-CH_2-OH

Answer»

SOLUTION :AQUEOUS KOH
Discussion
7144.

When 100 mL of 1.0 M HCl was mixed with 100 mL of 0.1 M NaOH in an insulated beaker at constant pressure, a temperature increase of 5.7^(@)C was measured for the beaker and its contents. Because the enthypy of neutralization of a strong acid with a strong base is a constant (-57.0" kJ mol"^(-1)), this experiment could used to measure the calorimeter constant. In a second experiment 100 mL of 2.0 M acetic acid (K_(a)=2.0xx10^(-5)) was mixed with 100 mL of 1.0 M NaOH (under identical conditions of Expt. 1) where a temperature rise of 5.6^(@)C was measured. (Consider heat capacity of all solutions as 4.2 J g^(-1) K^(-1) and density of all solutions as 1.0 g mL^(-1)) The pH of the solution after Expt. 2 is

Answer»

`2.8`
`4.7`
`5.0`
`7.0`

ANSWER :B
Discussion
7145.

The standard molar heats of formation of ethane, carbon dioxide, and liquid water are -21.1, -94.1, and -68.3kcal, respectively. Calculate the standard molar heat of combustion of ethane.

Answer»

Solution :Given that,
(i) `2C(s)+3H_(2)(g) to C_(2)H_(2)(g),DELTAH^(0)=-21.1"kcal"`
(ii) `C(s)+O_(2)(g) to CO_(2)(g),DeltaH^(0)=-94.1"kcal"`
(III) `H_(2)(g)+(1)/(2)O_(2)(g) to H_(2)O(g),DeltaH^(0)=-68.3"kcal"`
We have to calculate `DeltaH^(0)` of the EQUATION
`C_(2)H_(6)(g)+3(1)/(2)O_(2)(g) to 2CO_(2)(g)+3H_(2)O(g),DeltaH^(0)=?`
Applying the INSPECTION method,
[-Eqn. (i)+2xxEqn. (ii) +3xxEqn. (iii)], we GET,
`-2C(s)-3H_(2)(g)+2C(s)+2O_(2)(g)+3H_(2)(g)+1(1)/(2)O_(2)(g) to -C_(2)H_(6)(g)+2CO_(2)(g)+3H_(2)O(g),DeltaH^(0)=-(-21.1)+2xx(-94.1)+3xx(-68.3)`
`C_(2)H_(6)(g)+3(1)/(2)O_(2)(g) to 2CO_(2)(g)+3H_(2)O(g),DeltaH^(0)=-372.0"kcal"`
Discussion
7146.

What makes ethanoic acid a stronger acid than ethanol?

Answer»

Solution :Ethanoate ION obtained by loss of a PROTON from ETHANOIC acid is stabilized by resonance but ethoxide ion obtained by loss of a proton from ETHANOL is not.
Discussion
7147.

Two radioactive material A_(1) and A_(2) and decay constant of 10lambda_(0) and lambda_(0). If initially they have same number of nuclei, then after time (1)/(9lambda_(0)) the ratio of number of their undercayed nuclei will be:

Answer»

`(1)/(E)`
`(1)/(e^(2))`
`(1)/(e^(3))`
`(SQRT3)/(1)`

Answer :A
Discussion
7148.

When 100 mL of 1.0 M HCl was mixed with 100 mL of 0.1 M NaOH in an insulated beaker at constant pressure, a temperature increase of 5.7^(@)C was measured for the beaker and its contents. Because the enthypy of neutralization of a strong acid with a strong base is a constant (-57.0" kJ mol"^(-1)), this experiment could used to measure the calorimeter constant. In a second experiment 100 mL of 2.0 M acetic acid (K_(a)=2.0xx10^(-5)) was mixed with 100 mL of 1.0 M NaOH (under identical conditions of Expt. 1) where a temperature rise of 5.6^(@)C was measured. (Consider heat capacity of all solutions as 4.2 J g^(-1) K^(-1) and density of all solutions as 1.0 g mL^(-1)) Enthalpy of dissociation (in kJ mol^(-1)) of acetic acid from the Expt. 2 is

Answer»

`1.0`
`10.0`
`24.5`
`51.4`

ANSWER :A
Discussion
7149.

What is the significance of 'Gold number"?

Answer»

It measures the stability of colloidal system.
It measures the PROTECTIVE power of a colloid.
It measures the size of colloidal particles.
All of these

Solution :Protective power of LYOPHILIC colloids is measured in terms of .gold number.. It is defined as the number of MILLIGRAMS of a lyophilic colloid that will just prevent the precipitation of 10 mL of a gold sol on the addition of 1 mL of 10% sodium chloride solution.
Discussion
7150.

Which raw material is used in the preparation of soft glass ?

Answer»

`K_(2)CO_(3),SiO_(2),CaCO_(3)`
`K_(2)CO_(3),SiO_(2),PbCO_(3)`
`Na_(2)CO_(3),SiO_2,CaCO_(3)`
`Na_(2)CO_(3),SiO_(2),PbO`

Solution :Soft glass of which bottles are made, is prepared by heating together SILICA `(SiO_(2))` , SODIUM carbonate `(Na_2CO_(3))` and LIME stone `(CaCO_(3))`
Discussion