Sulphide ore is converted to oxide form by using the process________.

(a)

Calcination

(b)

Roasting

(c)

Smelting

(d)

Leavhing

Oxidation state exhibited by group 13 elements is ______

(a)

+1, +2 and +3

(b)

+1 and +3

(c)

+1 and +4

(d)

+2 +3 and +4

Hot concentrated H₂SO₄ is miderately strong oxidising agent which of the following reactions does not show oxidising behaviour?

(a)

\(Cu+2H_{ 2 }{ SO }_{ 4 }\longrightarrow { CuSO }_{ 4 }+{ SO }_{ 2 }+{ 2H }_{ 2 }O\)

(b)

\(Cu+2H_{ 2 }{ SO }_{ 4 }\longrightarrow { CuSO }_{ 4 }+{ SO }_{ 2 }+{ 2H }_{ 2 }O\)

(c)

\(Cu+2H_{ 2 }{ SO }_{ 4 }\longrightarrow { CuSO }_{ 4 }+{ SO }_{ 2 }+{ 2H }_{ 2 }O\)

(d)

\({ CaF }_{ 2 }+{ H }_{ 2 }SO_{ 4 }\longrightarrow { CaCO }_{ 4 }+2HF\)

Oxygen stabilises higher oxidation state because_______.

(a)

it is electronegative

(b)

of its tendency to form multiple bond

(c)

of large size

(d)

of small size

IUPAC name of H₂[Ptcl₆] is _______.

(a)

Hexa chloridoplatinum (IV) acid

(b)

Hexa chloridoplatinum (IV) acid

(c)

Hexachloridoplatinic (IV) acid

(d)

Dihydrogenhexaehloro platinate (IV)

If 'a' is the length of unit cell, then which one is correct relationship?

(a)

For simple cubic lattice, radius of metal atom =\(\frac{a}{2}\)

(b)

For bee lattice, radius of metal atom \(=\frac { \sqrt { 3a } }{ 4 } \)

(c)

For fcc lattice, radius of metal atom \(=\frac { a }{ 2\sqrt { 2 } } \)

(d)

All of these

Which of the following exists as covalent crystals in solid state?

(a)

phosphorus

(b)

sulphur

(c)

chlorine

(d)

silicon

A+B \(\longrightarrow \) C; ∆H = 60 kJ mol^-1 Ea_f = 150 kJ. What is the activation energy of the backward reaction?

(a)

210 kJ

(b)

105 kJ

(c)

90 kJ

(d)

145 kJ

The buffer present in human blood is _______.

(a)

CH₃COOH + CH₃COONa

(b)

NH₄OH + NH₄CI

(c)

H₂CO₃ + H\({ CO }_{ 3 }^{ - }\)

(d)

CH₃COOH + CH₃COONa and NH₄OH + NH₄CI

Auto catalysis is observed in the reaction given below.
CH₃COOC₂H₅+H₂O➝ CH₃COOH+C₂H₅OH

(a)

CH₃COOC₂H₅

(b)

H₂O

(c)

CH₃COOH

(d)

C₂H₅OH