Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is______.

(a)

CO₂

(b)

SO₃

(c)

SO₂

(d)

H₂S

Cupellation is a process used for the refining of________.

(a)

Silver

(b)

Lead

(c)

Copper

(d)

iron

Oxidation state of carbon in its hydrides _______.

(a)

+4

(b)

-4

(c)

+3

(d)

+2

Which of these is not a monomer for a high molecular mass silicone polymer?

(a)

Me₃SiCl

(b)

PhSiCl₃

(c)

MeSiCl₃

(d)

Me₂SiCl₂

Among the following, which is the strongest oxidizing agent?

(a)

Cl₂

(b)

F₂

(c)

Br₂

(d)

l₂

Among the following the correct order of acidity is ________.

(a)

HClO₂ < HClO < HClO₃ < HClO₄

(b)

HClO₄ < HClO₂ < HClO < HClO₃

(c)

HClO₃ < HClO₄ < HClO₂ < HClO

(d)

HClO < HClO₂ < HClO₃ < HClO₄

The most common oxidation state of actinoids is _______.

(a)

+2

(b)

+3

(c)

+4

(d)

+6

Solid CO₂ is an example of ________.

(a)

Covalent solid

(b)

metallic solid

(c)

molecular solid

(d)

ionic solid

Electro magnetic separation

(1)

Nuclear power plant

Borax

(2)

Sodium salt

SCN^-

(3)

Tinstone

U - 235

(4)

m.pt 1814 k

Scandium

(5)

ambidentatie

What are the differences between minerals and ores?

Give the uses of Borax

Give the oxidation state of halogen in the following.
a) OF₂
b) O₂F₂
c) Cl₂O₃
d) I₂O₄

Arrange the following in order of increasing molar conductivity
(i) Mg[Cr(NH₃)(Cl)₅]
(ii) Cr(NH₃)₅Cl]₃[CoF₆]₂
(iii) [Cr(NH₃)₃Cl₃]

Give any three characteristics of ionic crystals.

Explain the rate determining step with an example.

Give the uses of zinc.

Give the uses of argon.

Compare lanthanoids and actinoids.

Why ionic crystals are hard and brittle?

A first order reaction takes 8 hours for 90% completion. Calculate the time required for 80% completion. (log 5 = 0.6989 ; log10 = 1)

Explain the principle of electrolytic refining with an example.

CO is a reducing agent. Justify with an example.

Which is stronger reducing agent Cr²⁺ or Fe²⁺?

How do nature of the reactant influence rate of reaction.