Question # 1

Elements of II-A group are called alkaline earth metals due to the reason that

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they occur in earth only

they form divalent cations only

they have ns2 electronic configuration

their oxides and hydroxides are alkaline in nature and metals are present in earth crust

Only those metals can replace Hydrogen from dilute acids, which have

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High negative reduction potential

Low negative reduction potential

High positive reduction potential

low positive reduction potential

The enthalpy change AH of a process is given by the relation

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ΔΗ =ΔΕ + P∆V

ΔH=ΔE +W

ΔH =ΔΕ-ΔnRT

ΔΕ =ΔΗ + P∆V

Areal gas obeying Van der Waal's equation will resemble ideal gas ilf the:

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both a and b are large

both a and b are small

a is small and b is large

a is large and b is small

The fibre which contains polymers of vinylidine chloride as fibre forming substance is known as

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saran fibre

nylon

polyester

acetate fibre

Which one is not postulated in the kinetci molecular theory among the following?

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molecules are in chaotic motion

molecules of all the gases have same size and same mass

the volume of the molecules is negligible

all molecular collisions are elastic

Glycerin boil at 290°C under normal atmospheric pressure. If the pressure is reduced to 50 mm of Hg, it will boil

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above the given temperature

below the given temperature

at the same temperature

at 25°C

The synthesis of ethene from ethyl alcohol is a reaction

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Dehydration

Polymerization

Addition

Substitution

Which of the following is a steroid?

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vitamin A

vitamin B

vitamin C

vitamin D

In which of these processes are small organic molecules made into macro-molecules?

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The cracking of petroleum fractions

The fractional distillation of crude oil

The polymerization of ethane

The hydrolysis of proteins

Large molecule formed by combination of smaller units these smaller units are called:

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Polymers

Macromolecule

Micromolecule

a & b

Which of the following alkyl halides is used as a mathylating agent

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CH₂H₅l

CH₃l

C₂H₅Pr

C₂H₅Cl

Which functional group is present in glycerol tristearate

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Carboxylic acid

Alcohol

Aldehyde

Ester

When ammonia is heated with cupric oxide, a molecule of ammonia will

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Gain 3 electrons

Lose 3 electrons

Gain 2 electrons

Lose 2 electrons

Which of the following is not a colligative property?

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Depression in freezing point

Elevation of boiling point

Osmotic pressure

Modification of refractive index

If two lone pairs are present then bond angle of tetrahedral compound reduces to ______ degrees

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109.5°

107.5°

104.5°

None

Dow's process is used for the preparation of

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Ester

Ethers

Alcohols

Phenols

Cu²⁺with d⁹electronic configuration appears

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Yellow

Pink

Blue

Green

Which is the derived lipid?

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Common fats

Vitamin-D

Common oils

Spinolipids

The spectrum of He is expected to be similar to that of

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H

Na

He⁺

Li⁺

Which of the following has highest dipole moment?

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NH₃

PH₃

AsH₃

SbH₃

Ozone hole is maximum over

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Europe

Antarctica

Asia

Africa

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