Question # 1

Which of the following statement is not true for carbon.

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Its forms compounds with multiple bonds

Its ionization energy is very high

It undergoes catanation

It shows inert pair effect

The Hall process involves the reduction of Al2O3 to aluminium by

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Carbon

Carbon monoxide

Molecular hydrogen

Electrolysis

The most reactive alkali metal among the following is

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Li

Na

Cs

Rb

The most stable oxidation state shown by lead is.

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+2 , +4

+2 only

+3 , +4

+4 only

In the Aluminothermite process, aluminium acts as.

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An oxidizing agent

A reducing agent

A flux

A Solder

Pick out the incorrect statement for XeF4

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XeF4 disproportionate violently with water

It is used as fluorinating agent

It has octahedral structure for geometry

It oxidizes I to I₂

Which element amongst the following has the highest boiling point.

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Na

Mg

Ca

K

The lightest alkali metal is.

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Lithium

Sodium

Rubidium

Caesium

Which of the following species have undistributed octahedral structure.

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SF6

PF6

Si F₆^2-

XeF6

Which one of the following is not formed when an electric discharge passes through helium.

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HeH+

HeH2+

He2+

He2-

Among sodium phosphate, sodium sulphate and sodium chloride the solubility in water increases as.

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Chloride > Phosphate > Sulphate

Sulphate > Pohosphate> Chloride

Chloride > Sulphate > Phosphate

Phosphate > Chloride > Sulphate

Which of the following is not a proper use of Ni.

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It is used as catalyst

It is used in alloy formation

It is used in the preparation of Monel metal

It is attached by alkalis

The fluoride tooth paste contains

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SnF2 and Sn2P2O7

NaF

CaF2

None of these

Which of the following proportion is associated with the covalent nature of the compound.

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It conducts electricity in molten stater or aqueous state

It is a non electrolyte

It has high m.p.

It is a compound of a metal and non metal.

A type of a chemical bond which is formed by the mutual sharing of electrons between combining atoms of the same or different elements is called.

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Ionic bond

Covalent bond

Co ordinate Covalent bond

Metallic bond

Acid rain effects

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Human being

Crops

Aquatic life

All above

The carbonate of which of the following will have highest lattice energy.

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Barium

Magnesium

Calcium

Strontium

Highly dangerous acid and produces severe wounds on the skin.

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HCIO

HCIO2

HCIO3

HCIO4

Which of the following have +3 oxidation states.

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B & AI

In & TI

B & In

AI & TI

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

The solution of the transition metal complexes having one or more unpaired electrons in the d-orbital are.

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Coloured

Colourless

White

None of above

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