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NEET Chemistry Solved Question Paper 2014

Multiple Choice Questions

41.

The hydrides of the first elements in groups 15-17, namely NH₃, H₂O and HF respectively show abnormally high values for melting and boiling points. This is due to

small size of N, O and F
the ability to form extensive intermolecular H-bonding
the ability to form extensive intramolecular H-bonding
effective van der Waals' interaction

42.
The quantity of electricity needed to separately electrolyze 1 M solution of ZnSO₄ , AlCl₃ and AgNO₃ completely is in the ratio of

2 : 3 : 1

2 : 1 : 1

2 : 1 : 3

2 : 2 : 1

2 : 3 : 1

From the Faraday's IInd law, we know

W ∝ Zit or W ∝ $\frac{E}{96500} it$

or, it ∝ $\frac{1}{E}$ or electricity ∝ $\frac{1}{E}$

Thus, the amount of electricity required for ZnSO₄, AlCl₃ and AgNO₃ is in the ratio of 2 : 3 : 1.

Here, 2, 3 and 1 are the valencies of metal atom in the given compound.

Also, in ZnSO₄,

$\underset{1 mol}{{Zn}^{2 +}} + \underset{2 mol or 2 Faraday}{2 e^{-}} \to Zn$

in AlCl₃

$\underset{1 mol}{{Al}^{3 +}} + \underset{3 F}{3 e^{-}} \to Al$

in AgNO₃

$\underset{1 mol}{{Ag}^{+}} + \underset{1 F}{e^{-}} \to Ag$

Therefore, the ratio of amounts of electricity required is 2 : 3 : 1.

43.

The amount of electrolytes required to coagulate a given amount of AgI colloidal solution (-ve charge) will be in the order

NaNO₃ > Al₂(NO₃)₃ > Ba(NO₃)₂
Al₂(NO₃)₃ > Ba(NO₃)₂ > NaNO₃
Al₂(NO₃)₂ > NaNO₃ > Ba(NO₃)₂
NaNO₃ > Ba(NO₃)₂ > Al₂(NO₃)₃

44.

Among the following observations, the correct one that differentiates between SO $_{3}^{2 -}$ and SO $_{4}^{2 -}$ is

both form precipitate with BaCl₂, SO $_{3}^{2 -}$ dissolves in HCl but SO $_{4}^{2 -}$ does not
SO $_{3}^{2 -}$ forms precipitate with BaCl₂, SO $_{4}^{2 -}$ does not
SO $_{4}^{2 -}$ forms precipitate with BaCl₂, SO $_{3}^{2 -}$ does not
both form precipitate with BaCl₂, SO $_{4}^{2 -}$ dissolves in HCl but SO $_{3}^{2 -}$ does not

45.

The two half-cell reactions of an electrochemical cell is given as

Ag⁺+ e^- → Ag; $E_{{Ag}^{+} / Ag}^{°}$ = -0.3995 V

Fe²⁺ → Fe³⁺ + e^- ; $E_{{Fe}^{3 +} / {Fe}^{2 +}}^{°}$ = -0.7120 V

The value of cell EMF will be

-0.3125 V
0.3125 V
1.114 V
-1.114 V

46.

At 25°C, the molar conductance of 0.007 M hydrofluoric acid is 150 mho cm²mol^-1 and its Λ°_m = 500 cm²mol^-1. The value of the dissociation constant of the acid at the given concentration at 25°C is

7 × 10^-4 M
7 × 10^-5 M
9 × 10^-3 M
9 × 10^-4 M

47.

To observe an elevation of boiling point of 0.05°C, the amount of a solute (mol. wt. = 100) to be added to 100 g of water (K_b = 0.5) is

2 g
0.5 g
1 g
0.75 g

48.

A piece of wood from an archaeological sample has 5.0 counts min^-1 per gram of C-14, while a fresh sample of wood has a count of 15.0 min^-1g^-1. If half-life of C-14 is 5770 yr, the age of the archaeological sample is

8,500 yr
9,200 yr
10,000 yr
11,000 yr

49.

Two gases X (molecular weight M_x) and Y (molecular weight M_y; M_Y > M_X) are at the same temperature T in two different containers. Their root mean square velocities are C_X and C_Y respectively. If the average kinetic energies per molecule of two gases X and Y are E_X and E_Y respectively then which of the following realation(s) is (are) true?

E_X > E_Y
C_X > C_Y
E_X = E_Y = (3/2) RT
E_X = E_Y = (3/2) k_BT

50.

The formal potential of Fe³⁺ /Fe²⁺ in a sulphuric acid and phosphoric acid mixture (E° = +0.61 V) is much lower than the standard potential (E° = +0.77 V). This is due to