Question # 1

If a polymer has mass 63000, and the molar mass of repeating unit is 63 what is its degree of polymerization is

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10³

10²

10⁵

None of these

The number of moles of H2 in 0.224 L of hydrogen gas at STP (273 K, 1 atm) assuming ideal gas behaviour is

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1

0.1

0.01

0.001

Transportation causes to produce CO₂ in atmosphere:

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72%

73%

74%

75%

At higher temperature what is true for gases

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pressure is decreased

volume is decreased

number of moles are decreased

KE is increased

The product of pressure and volume remains constant when temperature and quantity of gas is:

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Zero

Variable

Kept constant

None of above

Which of the following gases have lowest density at room temperature

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CO

N₂

Ne

NH₃

Diamond and graphite are

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isomorphous

polymorphous

allotropes

none of these

The molar volume of CO₂ is maximum at:

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S.T.P. (0^∘C and 1 atm)

127^∘C and 1 atm

0^∘C and 2 atm

273^∘C 2atm

The solid particles posses only ______ kinetic energy

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Translational

Rotational

Viberational

Circular

The lattice energy of NaCl is

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787 j/ mole

790 kj/mol

780 kJ/ mol

-787 kI / mole

Which pair gives same dehydrohalogenation product

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I-Chlorobutane, 2-Chlorobutane

I-Chloropropane, 2-Chloropropane

I-Bromopentane. 3-Bromopentane

iso-butvl chloride. 2°- butyl chloride

In electronic watches or electronic calculators the tiny batteries used are

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Alkaline battery

NICAD battery

Fuel cell

Silver oxide battery

Gammexane is

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Chlorobenzene

Benzyl chloride

Brommobenzene

Benzene hexachloride

When of the following is isolelectronic with krypton

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Ca⁺⁺

Al⁺⁺⁺

Br^-1

I^-1

Rusting of iron is catalysed by

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Fe

O₂

Zn

H⁺

B-atom in BF₃has

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sp³hybridization

sp²hybridization

sp hybridization

no hybridization

The Electro-negatively difference for ionic bond must be greater than

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1.6

1.7

1.8

1.0

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Equal volumes of N₂and H₂are reacting

Equal masses of N₂and H₂are reacting

The reaction has stopped

The same amount of ammonia is formed as is decomposed into N₂and H₂

Which of the following is a constituent of nylon?

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Adipic acid

Styrene

Teflon

None of these

I a chemical reaction equilibrium is said to have been established when :

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Rate of opposing reactions are equal.

Rate constants of opposing reactions are equal.

Opposing reactions stop.

Concentration of reactants and products are equal

Heaviest particle is

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Meson

Neutron

Proton

Electron

When the 6d orbital is completed the entering electron goes into

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7f

7 s

7 p

7 d

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