3 g of oxide of a metal is converted to chloride completely and it yielded 5 g of chloride. The equivalent weight of metal is

• 12

• 20

• 33.25

• 2.325

20 mL of 0.25 N strong acid and 30 mL 0·2 N of strong base are mixed; the resulting solution is

• 0.02 N acidic

• 0.025 N basic

• 0.02 N basic

• 0.025 N acidic

The rate of forward reaction is two times that of reverse reaction at a given temperature and identical concentration. K

• 2.5

• 2.0

• 0.5

• 1.5

Ammonium ion is

• neither an acid nor base

• both an acid and a base

• a conjugate acid

• a conjugate base

A is an aqueous acid; B is an aqueous base. They are diluted separately, then

• pH of A decreases and pH of B increases

• pH of A increases and pH of B decreases till pH in each case is 7

• pH of A and B increase

• pH of B and A decrease

_ZX^M + ₂He⁴ → ₁₅P³⁰ + ₀n¹. Then

• Z = 12, M = 27

• Z = 13, M = 27

• Z = 12, M = 17

• Z = 13, M = 28

Compounds with high heat of formation are less stable because

• high temperature is required to synthesise them

• molecules of such compounds are distorted

• it is difficult to synthesise them

• energy rich state leads to instability

Heat of neutralisation of weak acid and strong base is less than the heat of neutralisation of strong acid and strong base due to

• energy has to be spent for the total dissociation of weak acid

• salt of weak acid and strong base is not stable

• incomplete dissociation of weak acid

• incomplete neutralisation of weak acid

A radio isotope will not emit

• gamma and alpha rays simultaneously

• gamma rays only

• alpha and beta rays simultaneously

• beta and gamma rays simultaneously

20.

Chemical bond implies

• attraction and repulsion

• attraetion and repulsion balanced at a particular distance

• attraction

• repulsion