Question # 1

When calcium is heated in the flame of a Bunsen burner, the colour imparted to the flame is.

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Golden yellow

Brick red

Crimson red

Grassy green

The electronegativity of phosphorus is.

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3.0

2.1

2.0

1.9

Which is the purest form of iron.

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Pig iron

Cast iron

Wrought iron

Steel

Metal crystallize is system having co ordination number

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8

12

14

any one of above

Which of the following is not alloy of aluminium.

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Aluminium bronze

Magnalum

Duralumin

Stellite

Of the following the commonly used n the laboratory desiccator is.

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Anhyd. Na2Co3

Anhyd Ca Cl2

Dry NaCl

None of the above

Inert pair effect is best shown by

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Si

Z

Sn

Pb

Which of the following is not true of ozone.

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It is a strong electilizing agent

It attacks organic compounds containing carbon carbon double bond

Its molecular is linear and has two different O-O bond lengths

It is more powerful oxidising agent at molecular oxygen

Lewis concept explain the formation of

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Ionic bond

Covalent bond

Co-ordinate bond

Chemical bond

Which among the following hydride is ionic in nature.

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Ammonia

Protium oxide

Calcium hydride

Sulphane

A molecule MX4 has a square planar shape, The number of non bonding pairs of electrons around M is .

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2

1

0

3

The correct order of reactivity among I , Ii, and III IS.

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i > ii >iii

i > iii > ii

II > III > I

III > II > I

Reacts violently with water

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AlH3

AlCl3

Lia IH4

Al2Cl6

A mixture of weak acid and its salt is.

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Alkaline buffer

Acidic buffer

Neutral buffer

All of above

Which of the following has maximum number of unpaired electrons.

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Fe3+

Fe2+

Co2+

CO3+

Since the acid gives both acidic and normal salts so the acid is.

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di acid

di basic

double salt

Any of above

Chlorine gas acts as a bleaching agent only in presence of.

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dry air

Moisture

Sunlight

Pure oxygen

In manufacturing of cement crystallization of amorphous dehydration products of clay

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500 ^oC to 800 ^oC

900 ^oC to 1200^oC

1250 ^oC ti 1400 ^oC

1000 to 1100 ^oC

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

HCIO evolves Cl2 and O2 when dissolve

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Ca

Ni

Cu

Any of above

The magnitude of electron affinity depends on.

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Atomic size

Nuclear charge

Electronic configuration

All of the above

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