﻿ Sodium nitrate on reduction with Zn in presence of NaOH solution

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# 1.Sodium nitrate on reduction with Zn in presence of NaOH solution produces NH3. Mass of sodium nitrate absorbing 1 mole of electron will be7.750 10.625 8.000 9.875

B.

10.625

In the equation,

Zn + 2OH- → ZnO${}_{2}^{2-}$ + 2H+ + 2e-

NO${}_{3}^{-}$ + 8H+ + 8e- → OH- + 2H2O + NH3

Now, from the equation, we get

8 moles of electron absorbed by 85 gm of NaNO3.

$\therefore$ 1 mole of electron absorbed by $\frac{85}{8}\mathrm{g}$ of NaNO3 = 10.625 gm

2.

In transforming 0.01 mole of PbS to PbSO4, the volume of '10 volume' H2O2 required will be

• 11.2 mL

• 22.4 mL

• 33.6 mL

• 44.8 mL

3.

An unknown element forms an oxide.What will be the equivalent weight of the element if the oxygen content is 20% by weight?

• 16

• 32

• 8

• 64

4.

2 N HCl solution will have same molar concentration as a

• 4.0 N H2SO4

• 0.5 N H2SO4

• 1 N H2SO4

• 2 N H2SO4

5.

Addition of sodium acetate to 0.1 M acetic acid will cause

• increase in pH

• decrease in pH

• no change in pH

• change in pH that cannot be predicted

6.

The electronic configuration 1s2, 2s22p6, 3s23p63d9 represents a

• metal atom

• non metal atom

• non-metallic anion

• metallic cation

7.

Unusually high boiling point of water is result of

• intermolecular hydrogen bonding

• intramolecular hydrogen bonding

• both intra and inter molecular hydrogen bonding

• high specific heat

8.

In a given shell the order of screening effect is

• s > p > d > f

• s > p > f > d

• f > d > p > s

• s < p < d < f

9.

A catalyst is a substance which

• increases the equilibrium constant of the reaction

• increases equilibrium concentration of products

• does not alter the reaction mechanism

• changes the activation energy of the reaction

10.

Which of the following expressions gives the de-Broglie relationship?

• $\mathrm{p}=\frac{\mathrm{h}}{\mathrm{mv}}$

• $\mathrm{\lambda }=\frac{\mathrm{h}}{\mathrm{mv}}$

• $\mathrm{\lambda }=\frac{\mathrm{h}}{\mathrm{mp}}$

• $\mathrm{\lambda m}=\frac{\mathrm{v}}{\mathrm{p}}$