Question # 1

In each period the most electro negative element belongs to.

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^{Group -1}

Group -17

Group -2

Group -18

H-Bond has more energy than the van der Waals forces i.e.

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1.0 kcal/mole

2.0 k cal/mole

10.0 kcal/mole

20. 0 kcal mole

In vinyl cyanide, the number of a bonds in

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2

3

1

4

The pH of the 0.0032 M H2SO4 is.

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3.2

4.0

2.198

1.0

Is a chain silicate

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Olivine

Tremolite

Beryl

Zeolite

Halogens are coloured because.

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They are strong oxidant

Their molecules are held together by weak van der Waals forces

Their atoms absorb radiations form visible range causing the excitation of valence electrons to higher energy of levels

Their molecules absorb light radiation forming the oxcited state.

Ca H2 on reaction with water liberates

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H2

O2

Botha of these

None of these

The forces which holds the atoms together in a molecule is called

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Ionic bond

Covalent bond

Co ordinate bond

Chemical bond

Which of the following is the active ingredient in ordinary household bleach.

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HCl

Cl2

NaCl

NaCIO

Mostly used solvents for ionic compounds.

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Liquid ammonia

Liquid SO2

Liquid HF

All above

AlCl3 fumes in air because of.

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Hydrolysis

Dehydration

Hydration

Oxidation

In average composition of a good sample of cement the percentage of silica is.

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18.5%

20.5%

22.5%

24.5%

At high temperature nitrogen combines with calcium carbide to give

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Calcium cyanide

Calcium cyanamide

Calcium nitride

Calcium cabonate

Which of the following statements is false about transition metals.

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They form complexes

They show variable valency

All transition metal compounds are paramagnetic

They form coloured ions

Which of the following are neutral ligands.

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NH3

H2O

CO & NO

All of above

The value of Kw increase with temperature because the ionization of water.

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Positive

Negative

Endothermic

Exothermic

In whihc period, the element with least ionization enthalpy belong to

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Group I

Group 2

Group 17

Group 18

Which of the following compounds is electrovalent in nature.

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SO2

ICI

KBr

CHI3

Which of the following bonds will be non polar.

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N - H

O - H

C - H

C l - Cl

The shape of SO₄^2-ion is.

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Tetrahedral

Trigonal planar

Square planar

Octahedral

Concentrated aqueous sodium hydroxide can separate a mixture of.

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Al3+ and Sn2+

Al3+ and Fe3+

Al3+ and Zn2+

Zn2+ and Pb2+

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