Question # 1

The number of unpaired electrons present in Fe ions is

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1

2

5

0

The rate of diffusion of a gas is inversely proportional to:

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Density of a gas

Velocity of the gas

Viscosity of the gas

All of above

Which of these are isomrophous to one another NaCl, NH₄Br, K₂CrO₄, K₂SO₄

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NaCl and NH₄Br both cubic

NH₄Br and K₂SO_{4 both tetragonal}

K₂CrO_{4 and}K₂SO₄orthorhombic

NaCl and K₂SO₄both rhobohedral

Choose the chief air pollutant among the following which depletes ozone layer:

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carbon monoxide

carbon dioxide

chloroflurocarbons and nitrogen oxides

sulphur dioxide

Reason of pollution are:

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Population and urbanization

Transportation

Industrialization

All of these

Elastic collision involves:

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gain of energy

loss of energy

no relationship between elastic

no gain or loss of energy

The attractive forces which are created due to repulsion of electronic cloud of the molecules are

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dipole-dipole forces

ion dipole forces

instantaneous dipole-induced dipole forces

dipole-induced dipole forces

Dalton's law finds its application during the process of:

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Digestion

Respiration

Reproduction

All of above

Transformation is a cyclic process in which used plactic is

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Remelted and styrene is added

Converted into low quality substance

Converted back into original components

None of these

Enthalpy of formation of one mole of ionic compound form gaseous ion under standard condition is called

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Gibb's energy

Bond energy

Lattice energy

Which of these polymers is a synthetic polymer?

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animal fat

starch

cellulose

polyester

Two or more similar monomers combine to form:

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Homopolymer

Copolymer

Ter polymer

Thermoplastic polymers

Lactic acid on heating with dil. H₂SO₄gives

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Acetic acid

Propionic acid

Acrylic acid

Formic acid

Aldehydes can be distinguished from ketones by

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2,4-DNPH test

NaHSO₃test

N₂H₄test

Tollen's test

How many moles of hydrogen atoms does 3.2 g of methane, CH₄, contain?

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0.02

0.2

0.4

0.8

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

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low ionization energy of sodium

sublimation of metallic sodium to give yellow vapour

emission of excess energy absorbed as a radiation in the visible region as a radiation in the visible region

photosenitivity

Components of environment are:

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Atmosphere

Hydrosphere

Lithosphere

All of these

When ethyl iodide and n-propyl iodide are allowed to react with sodium metal in ether, the number of alkanes that could be produced is

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Only one

Two alkanes

Three alkanes

Four alkanes

Select from the following the one which alcohol

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The method in which alkanes prepared by alkyle halides in the presence of palladium - charcoal is

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Hydrolysis

Electrolysis

Hydrogenation

Hydrogenolysis

Which of the following with aqueous KOH will give acetaldehyde?

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1, 2-Dichloroethane

1,1-Dichloroethane

Chloracetic acid

Ethyl chloride

Out of Cu, Ag, Fe and Zn the metal which can displace all others from theri salt solution is

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Ag

Cu

Zn

Fe

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