One of the products of the thermal decomposition of sodium trioxonitrate (V) is

• A) sodium
• B) nitrogen
• C) sodium dioxonitrate (III)
• D) sodium oxide

In the production of soap, concentrated sodium chloride solution is added to

• A) Increase the solubility of soap
• B) Decrease the solubility of the soap
• C) Saponify the soap
• D) Emulsify the soap

Consider the following equilibrium reaction: 2AB₂(g)+B₂(g)→2AB₃(g). ΔH=−XkJmol^−1. The backward reaction will be favored by

• A. a decrease in pressure
• B. an increase in pressure
• C. a decrease in temperature
• D. an introduction of a positive catalyst

Polyvinyl chloride is used in the production of

• A. glass
• B. alloy
• C. pipes
• D. ceramics

The diagram represents

• A) A spontaneous reaction
• B) An exothermic reaction
• C) A non-spontaneous
• D) An endothermic reaction

One of these metals is not an alkali metal

• A) K
• B) Cs
• C) Sr
• D) Rb

An organic compound with fishy smell is likely to have a general formula?

• A. RCONHR¹
• B. RCONH₂
• C. RNH₂
• D. RCOR¹

Carbon (II) oxide is considered dangerous if inhaled mainly because it

• A) can cause injury to the nervous system
• B) competes with oxygen in the blood
• C) competes with carbon (IV) oxide in the blood
• D) can cause lung cancer

The impurities formed during the laboratory preparation of chlorine gas are removed by

• A) H_2O
• B) NH₃
• C) H_2SO4
• D) HCl

For a gas, the relative molecular mass is equal to 2Y. What is Y?

• A. The mas of the gas
• B. The vapour density of the gas
• C. The volume of the gas
• D. The temperature of the gas