Which of the following is used extensively in manufacturing photographic chemicals?

A. Aluminium chloride

B. Zinc chloride

C. Silver chloride

D. Mercury (ll) chloride

E. lron (ll) chloride

Given that 1 mole of carbon -12 weighs 12.0g, how many atoms are there in 24.0g magnesium? (C = 12, Mg = 24, NA = 6.02 x 10 ²³mol^-1)

A. 1/2 x 6.02 x 10 ²³

B. 1 x 6.02 x10 ²³

C. 2 x 6.02 x 10 ²³

D. 3x 6.02 x 10 ²³

E. 4x 6.02 x 10 ²³

What is the concentration, in mol dm ³, of solution is allowed to evaporate the allotrope of sulphur formed is

A. plastic sulphur

B. amorphous sulphur

C. rhombic sulphur

D. monoclinc sulphur

E. colloidal sulphur

If sulphur is dissolved in carbon (IV) sulphide and the solution is allowed to evaporate, the allotrope of sulphur formed is

A. plastic sulphur

B. amorphous sulphur

C. rhombic sulphur

D. monoclinc sulphur

E. colloidal sulphur

Given that for the reaction. N2(g) + 3H2(g) ⇌ 2NH3(g) ∆H = -92kJ. What is the enthalpy of formation of ammonia from its elements?

A. -46KJ mol ^-1

B. -184KJmol ^-1

C. -92KJmol ^-1

D. 184KJmol ^-1

E. +46KJmol ^-1

The following are s-block elements except

A. lithium

B. magnesium

C. potassium

D. calcium

E. aluminium

Which of the following statements is not true of tin? it

A. is a p-block element

B. is extracted from cassiterite SnO ₂

C. is used for protecting iron containers from corrosion

D. combines with copper to form the alloy brass

E. shows two oxidation states, + 2 and + 4 in most of its compounds

What quantity of copper will be deposited by the same quantity of electricity that deposited 9.0g of aluminum? (A = 27, Cu = 64)

A. 64g

B. 32g

C. 7.1g

D. 6.4g

E. 3.2g

The electronic configuration of two atoms X and Y are as follows: X - 1s ² 2s ²2p ⁶3s ¹, Y -1s ²2s ²2p ⁶3s²3p ⁶4s ² which of the statements below is true of the position of X and Y in the Periodic Table?

A. x belongs to group 1, Y belongs to period 2,

B. x belongs to group 1, Y belongs to period 4

C. x belongs to group 2, Y belongs to period 1

D. x belongs to group 3, Y belongs to period 2

E. x belongs to group 3, Y belongs to period 4

Which of the following is a condition for a spontaneous reaction?

A. ∆H -T is zero

B. ∆H-T∆ S is positive

C. ∆H-T∆ S is negative

D. ∆S is zero

E. ∆S is positive