Question # 1

Metallic magnesium is obtained by

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Reduction of MgO with Coke

Electrolysis of an aqueous solution of MgCl2

Electrolysis of molten MgCl2

Displacement of magnesium by iron form MgCl2 solution.

H2SO4 is manufactured by

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The lead chamber process

The contact process

Both A and B

The Ostwald's process

The most reactive alkali metal among the following is

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Li

Na

Cs

Rb

If Steel is heated to a temperature well below red heat and to then cooled slowly the process is called.

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Annealing

Quenching

Tempering

Nitriding

The Lewis formula of SOCl2 the total number of bond pairs and lone pairs of electrons around sulphur are.

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2,1

2 ,2

3 ,1

3 ,0

According to the VSEPR theory, the shape of the SO3 molecule is.

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Pyramidal

Tetrahedral

Trigonal planar

Distorted totrahedron

The three dimensional silicate anion (Si2O5^2-)n is present in

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Beryl

Silica

Asbestos

Clays

CFT can very well explain

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Color

Magnetic properties

Spectra of transition metal

All

Lithum silicide reacts with concentrated hydrochlric acid to give lithium chlride along with.

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H2 and SI

Si H 4 gas

Disilane gas

Si3H8

Metals are

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Transparent

Tranalucant

Opaque

None of above

Which of the following compound does not following octet rule.

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CS2

PBr3

IBr

Br F3

The process in which ore is heated generally in the absence of air, to expel water from a hydrated oxide at temperature below their melting points is called.

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calcination

Roasting

Froth floatation

Bessemerization

Explosive trioxide XeO3 is produced when

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XeOF4 reacts with water

XeOF4 reacts with silica

XeF4 reacts with water

Any of above statements

The energy gap between tag and eg sets in denoted by

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A-

10 Dq

Both A and B

None of above

Anhydrous AlCl3 cannot be obtained by heating hydrated AlOI3 ,6h2o Because.

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It decomposes completely to give Al2O3

It does not lose water completely

It undergoes hydrolysis to give Al(OH)3

AlCl3 .6H2O is very stable.

CoCl3 ,6NH3 has six NH3 molecules that satisfy the valency of the Cu3+ metal ion

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Primary

Secondary

Both A and B

None of above

Phosphorus normally exhibit a covalency of.

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+1 and +2

+2 and +3

+3 and +4

+4 and +5

Which of the following is most soluble in water

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CaSO4

Sr SO4

MgSO4

BaSO4

In Ostwald's process of manufacturing nitric acid a mixture of ammonia gas with air is mantained with ratio.

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1 : 4

1 :3

1: 8

1 : 10

Which of the following elements forms maximum number of compounds.

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Carbon

Silicon

Hydrogen

Fluorine

The most stable oxidation state shown by lead is.

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+2 , +4

+2 only

+3 , +4

+4 only

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