Sodium nitrate on reduction with Zn in presence of NaOH solution produces NH₃. Mass of sodium nitrate absorbing 1 mole of electron will be

• 7.750

• 10.625

• 8.000

• 9.875

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

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

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

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

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

• metal atom

• non metal atom

• non-metallic anion

• metallic cation

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

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

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

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

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

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

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