If y is an oxidizing agent that reacts with a reducing agent, Z, which of the following is correct?

• A. Y increases in oxidation number
• B. Y becomes reduced
• C. Z loses protons
• D. Z gains protons

Hardness in water can be removed by adding

• A. copper (ll) tetraoxosulphate (IV)
• B. sodium trioxocarbonate (IV)
• C. sodium chloride
• D. alum

What quantity of aluminium is deposited when a current of 10A is passed through a solution of an aluminium salt for 1930s? [Al = 27, F = 96500 C mol -1]

• A) 0.2 g
• B) 1.8 g
• C) 5.4 g
• D) 14.2 g

The bonds in crystalline ammonium chloride are

• A. covalent and dative
• B. ionic and covalent
• C. ionic, covalent and dative
• D. ionic, covalent and hydrogen bond

How many lone pairs of electron are there on the central atom of the H₂O molecules?

• A. 1
• B. 2
• C. 3
• D. 4

The characteristics reaction of carbonyl compounds is?

• A. substitution
• B. elimination
• C. addition
• D. saponfication

Chlorine, consisting of two isotopes of mass numbers 35 and 37, has an atomic mass of 35.5. The relative abundance of the isotope of mass number 37 is?

• A) 20
• B) 25
• C) 50
• D) 75

Destructive distillation of coal means

• A. heating coal in plentiful supply of air
• B. burning coal in air to produce water and carbon (IV) oxide
• C. heating coal in the absence of air
• D. heating coal in limited supply of air

It is difficult to achieve an orderly arrangement of the molecules of a gas because they

• A. have no definite shape
• B. have little force of attraction between them
• C. can collide with one another in the container
• D. are too small in size

Which of the following salt solutions will have a pH greater than 7?

• A. NaCI(aq)
• B. Na²CO³(aq)
• C. N²2SO⁴(aq)
• D. NaHSO⁴(aq)