Bauxite has the composition ______.

(a)

Al₂O₃

(b)

Al₂O₃.nH₂O

(c)

Fe₂O₃.2H₂O

(d)

None of these

Cupellation is a process used for the refining of________.

(a)

Silver

(b)

Lead

(c)

Copper

(d)

iron

Boric acid is an acid because its molecule________.

(a)

contains replaceable H⁺ ion

(b)

gives up a proton

(c)

combines with proton to form water molecule

(d)

accepts OH^- from water, releasing proton.

The molarity of given orthophosphoric acid solution is 2M. Its normality is _______.

(a)

6N

(b)

4N

(c)

2N

(d)

none of these

The alloy of copper that contain Zinc is________.

(a)

Monel metal

(b)

Bronze

(c)

bell metal

(d)

brass

Coinage metals are _______.

(a)

normal metals

(b)

transition metals

(c)

active metals

(d)

alkali metals

An excess of silver nitrate is added to 100ml of a 0.01M solution of Pentaaquachlorochromium (III)chloride. The number of moles of AgCl precipitated would be _______.

(a)

0.02

(b)

0.002

(c)

0.01

(d)

0.2

_______ valencies are directional in nature.

(a)

primary

(b)

secondary

(c)

tertiary

(d)

None

The composition of a sample of wurtzite is Fe_0.93 O_1.00 what % of Iron present in the form of Fe³⁺?

(a)

16.05%

(b)

15.05%

(c)

18.05%

(d)

17.05%

The crystal with a metal deficiency defect is ________.

(a)

NaCl

(b)

FeO

(c)

ZnO

(d)

KCl

Which type of defect is found in transition metals that have variable valency?

(a)

Frenkel defect

(b)

Schottky defect

(c)

Line defect

(d)

Metal deficiency defect

The total number of atoms per unit cell in fee lattice is_______.

(a)

4

(b)

8

(c)

12

(d)

2

The addition of a catalyst during a chemical reaction alters which of the following quantities?

(a)

Enthalpy

(b)

Activation energy

(c)

Entropy

(d)

Internal energy

For a reaction: aA ⟶ bB, the rate of reaction is doubled when the concentration of A is increased by four times. The rate of reaction is equal to _____.

(a)

k[A]^a

(b)

\(k{ \left[ A \right] }^{ \frac { 1 }{ 2 } }\)

(c)

\(k{ \left[ A \right] }^{ \frac { 1 }{ a } }\)

(d)

K[A]

Activation energy of a reactant is reduced by ________.

(a)

increased temperature

(b)

reduced temperature

(c)

increased pressure

(d)

reduced pressure

What is the role of quick lime in the extraction of Iron from its oxide Fe₂O₃?

Which type of ores can be concentrated by froth floatation method? Give two examples for such ores.

Name the various refining process.

How is nitrogen prepared from liquid air?

Arrange the following complex ions in the increasing order of crystal filed splitting energy (\({ \triangle }_{ 0 }\)) [CrCI₆]^3-, [Cr(CN)₆]^3-, [Cr(NH₃)₆]³⁺

What are point defects?

Explain the following terms with suitable examples.
(i) Gangue
(ii) slag

Distinguish Roasting and Calcination.

List the applications of gold.

Give the uses of silicones.

Write the reason for the anomalous behaviour of Nitrogen.

What is chromyl chloride test? Give equations.

Write a note on zeolites.

Mention the type of hybridisation and magnetic property of the following complexes using VB theory a) [FeF₆]^4- b) [Fe(CN)₆]^4-

Give the structure for the following compounds.
(i) pentaamminechlorocobalt (III) ion
(ii) Triamminetrinitrito- k N cobalt (III)
(ill) tetraammineaquabromidooobalt(III)nitrate
(iv) Dichloridobisethane-(1,2-diamine) cobalt (lIl) chloride
(v) Tetraamminecopper (lI) sulphate

From the following data, show that the decomposition of hydrogen peroxide is a reaction of the first order:

t(min)	0	10	20
V(ml)	46.1	29.8	19.3

Where t is the time in minutes and V is the volume of standard KMnO₄ solution required for titrating the same volume of the reaction mixture.

The specific reaction rates of a chemical reaction are 2.45 x 10^-5 sec^-1 at 273 K and 16.2 x 10^-4 sec^-1 at 303 K. Calculate the activation energy.