The basicity of tetraoxosulphate (VI) acid is

• A) 7
• B) 5
• C) 4
• D) 3

Alloys are best prepared by

• A) Electroplating
• B) Arc-welding
• C) Reducing and mixture of their metallic oxide
• D) Cooling a molten mixture of the metals

N\(_2\)O\(_4\) ⇔ 2NO\(_2\) (Δ = -ve)

From the reaction above, which of these conditions would produce the highest equilibrium yield for N\(_2\)O\(_4\)?

• A. Low temperature and high pressure
• B. Low temperature and low pressure
• C. high temperature and low pressure
• D. high temperature and high pressure

A charged car battery has _______ energy that can be converted into another energy called _______ energy

• A) Chemical, electrical
• B) mechanical, chemical
• C) heat, mechanical
• D) light, electrical

The shape of ammonia molecule is?

• A. Trigonal planar
• B. Octahedral
• C. Square planar
• D. Tetrahedral

The Sulphide which is insoluble in dilute hydrochloric acid is

• A) FeS
• B) CuS
• C) ZnS
• D) Na2S

A reaction takes places spontaneously if?

• A. ∆G = O
• B. ∆S< O and ∆H > O
• C. ∆H< T ∆S
• D. ∆G > O

What is the main impurity in haematite?

• A. CaSiO₃
• B. CaCO₃
• C. SiO₃
• D. Fe2O₃

Which of the following statements is not corrected about electrolysis?

• A) Reduction occurs at the anode
• B) Anions migrate to the anode
• C) Positive ions migrate to the cathode
• D) Concentration affects the discharge of ions

Which of the following substances causes the depletion of the ozone layer in the atmosphere?

• A. Carbon (IV) oxide
• B. Chlorofluorocarbon
• C. Sulphur (IV) oxide
• D. Hydrocarbons