Question # 1

Which one of the following is not air pollutant gas

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CO

CO₂

NO

SO₂

In the electronic configuration of Cr one electron from 4s sub-shell is transfered to 3d sub-shell because

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The 3rd orbital is of lower energy than 4s

The 4s orbital is of equal energy to 3d orbital

The half filled d-subshell is more stable than incomplete d-sub shell

6 unpaired electrons make Cr more paramagnetic

Three sp²hybrid are co-planar at an angle of

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104.5°

109.5°

107°

120°

Alkenes normally have ______ geometry

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Tetrachedral

Linear

Planer

None

C₂H₅OH can be differentiated from CH₃OH by

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Reaction with HCl

Reaction with NH₃

Iodoform test

Solubility in water

Estimation of Na in sea water is an example of

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Numerical analysis

Qualitative analysis

Quantitative analysis

None of above

Which oxide of nitrogen is obtained on heating ammonium nitrate at 250° C?

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Nitric oxide

Nitrous oxide

Nitrogen dioxide

Dinitrogen tetraoxide

Which of the following molecules has unpaired electrons in anti-bonding molecular orbitals?

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O₂

N₂

Br₂

F₂

What causes nitrogen to be chemically inert?

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Multiple bond formation in the molecule

Absence of bond distance

Short internuclear distance

High bond energy

Covalent compounds are soluble in

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Polar solvents

Non-polar solvents

Concentrated acids

All solvents

What are alloys

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A homogenous mixture of two or more elements

A homohenous mixture of metal and a non-metal

A homogenous mixture of two or more metals

None of the above

The boiling point of heavy water is

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108°C

101.4°C

99°C

110°C

P₂O₅is heated with water to give

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Hypophosphorus acid

Phosphorus acid

Hypophosphorus acid

Orthophosphorus acid

The covalent bonds are

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Unidirectional

Bi-directional

Non-directional

Multi-directional

Hemoglobin contains nearly:

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10,000 atoms

100 atoms

1000 atoms

1 atom

Which of the following reagent cannot be used for preparing alkyl chloride from alcohol?

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HCl + anhyd. Zncl₂

NaCl

PCl₅

SOCl₂

The bond angle between hydrogen atoms and carbon in alkane is

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104.5°

107.5°

109.5°

120.5°

Purines include

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Adenine

Guanine

Both a and b

None

Which salt is used for preserving food

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CaCl₂

NaCl

Na₂SO₄

BaCl₂

Due to the bacterial action on wood it is converted into

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Peat

Lignite

Bituminous coal

Anthracite

Alkanes are gases :

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C₁-C₄

C₅-C₁₀

C₁₁-C₁₅

C₁₀-C₂₀

Number of sigma bonds in P₄O₁₀is

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6

7

17

16

Which of the following fibres are made of polyamides?

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Dacron

Orlon

Nylon

Rayon

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Buffers having pH less than 7 are made

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Mixture of weak acid + salt of it with strong base

Mixture of weak acid + salt of it with weak base

Mixture of weak base + salt of it with strong acid

Mixture of weak base + salt of it with weak base

Objects of the size of an atom can be observed in

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An electron microscope

An x-ray spectrum

Atomic absorption spectrum

A visible spectrum

Methyl alcohol is not used

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As a solvent

A an anti-freezing agent

As a substitute for petrol

For denaturing of ethyl alcohol

The shape of CIO^-₃according to valence shell electron pair repulsion theory will be

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Planar triangle

Pyramidal

Tetrahedral

Square planar

Primary and secondary alcohols on action of red hot copper give

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Aldehydes and ketones respectilvely

ketones and aldehydes respectively

Only aldehydes

Only ketones

The bond order of individual C - C bond is benzene is

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One

Two

Between one and two

One and two alternately

On passing ethane into concentrated suphuric acid the intermediate compound formed on hydrolysis with boiling water gives

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Methyl alcohol

Ethyl alcohol

Ethyl hydrogen sulphate

Methyl hydrogen sulphate

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