Question # 1

Calcium cyanamide on treatment with steam under pressure gives NH3 and

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Calcium carbonate

Calcium hydroxide

Calcium oxide

Calcium bicarbonate

The maximum absorption in [Ti(OH)2)6 3+ take place at wavelength of.

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6000 A^o

10000 A^o

4000 A^o

5000 A^o

An element with atomic number 20 is placed in which period of the periodic table.

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1

2

3

4

The rusting of iron is catalyzed by which of the following.

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Fe

H+

O2

Zn

Which of the following is not alloy of aluminium.

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Aluminium bronze

Magnalum

Duralumin

Stellite

Aque regia is made by dissolving a mixture of HNO3 and HCl with ratio.

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1 : 1

1 : 3

1 : 2

1 :10

The name hydrogen was proposed by.

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Lavoisier

Rutherford

Henry Cavandish

Scheele

Which number of halogen family does not show positive oxidation state.

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Fluorine

Chlorine

Bromine

Iodine

Elements in which differentiating electron enters the (n-1) the d-orbitals of the (n-1) the main shell are called elements.

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s- block

p-block

d-block

f-block

The correct order of ionic radii for the following ions is.

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S²- < P^3- < Cl- < K+

Cl- > S2+ > P3- > k+

K+ > Cr > S2+ > P3-

P3+ > S2 > Cl - > K+

Artificial nitrogen fixation may occur by the formation of.

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Nitric acid

Ammonia

Nitrides

Any of above

HCIO evolves Cl2 and O2 when dissolve

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Ca

Ni

Cu

Any of above

The important condition for the formation of chemical bond is that.

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Their electron clouds should not diffuse

Both atoms should have high electron affinites.

Both atoms should have same electronegativities

The process should be accompanied by the lowering in potential energy.

Which of the following ahs non zero dipole moment.

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NH3

SF6

BF3

CO2

The lightest alkali metal is.

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Lithium

Sodium

Rubidium

Caesium

When a lead a storage battery is discharged .

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SO2 is evolved

PbS is consumed

Pb is formed

H2SO4 is consumed

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.

Which of the following steps in involved in the metallurgy of aluminium.

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Purification of bauxite

Electrolytic reduction of alumina

Refining of aluminum

All above

The electronic configuration of sodium (Z=11)

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1s2, 2s2, 2p4

1s2, 2s2, 2p6, 3s2 , 2p5

1s2, 2s2, 2p6, 3s1

1s2, 2s2, 2p6, 3s2

Pick out incorrect statement about K2Cr2O7

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It oxidizes acidified solution H2SO4 to S

It oxidizes KI to I2

It oxidizes HCl to Cl2

It gives oxygen, when treated with cold conc. H2SO4

Alumina is not used as

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Refractory material

A medium in chromatography

An abrasive

A White pigment

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