Question # 1

Boiling point of water is higher (100°C) than that of ethanol (78.5°C) although both have hydrogen bonding. This is because

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water molecules are closely packed

water is more acidic than ethanol

ethanol is an organic liquid

number of hydrogen bonds are more in H₂O

Which substances do not react immediately with bromine water

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Wthane

Benzene

Ethene

Phenol

The material possessing superconducting properties is

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Yb Ba₂ Cu₂ O₈

Hg Be₂ Ca₂ Cu₂ O₈

Y Ba₂ Cu₃ O₇

Y B₂ Cu₃ O₇

When gaseous chemicals are transported y road or by rail they are classified as follows:
flammable non-flammable poisonous
which gas is poisonous:

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butane

non-flammable

hydrogen

sulphur dioxide

The peptide bond is

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Glycine

Non-covalent bond

Weak bond

Responsible for secondary structure of protein

Consider the reaction

PCI5 (g) <---------> PCl3 (g) +Cl2 (g) in a closed container at equilibrium. At a fixed temperature, what will be the effect of adding more PCl5 on the equilibrium constant

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It increases

It remains unaffected

It decreases

Can't be predicted without Ki

Anthracene contains number of fused benzene rings

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1

2

3

4

The boiling of water may be 120°C, when the external pressure is

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greater than 760 torr

less than 760 torr

equal to 760 torr

variable

The respiration process taking place in animals depends on a difference in

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Partial pressure

Osomotic pressure

Vapour pressure

Atomospheric pressure

Carboxylic acids can be prepared from:

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Oxidation of alkane

Oxidation of alcohols

Oxidation of aldehydes

All of these

Which of the following statements about amorphous solids is incorrect?

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They melt over a range of temperature

They are anisotropic

There is no orderly arrangement of particles

They are rigid and icompressible

Which of the following reagent will react with both aldehyde and ketones?

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Grinard's reagent

Tollen's reagent

Fehling's reagent

Benedict's reagent

The liquid obtained after passing the mixture through filter paper is termed as :

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Extract.

Residue.

Filtrate.

Sample.

The catalyst,. which is used as specialist for cracking, are

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Aluminates

Alumlnosilicates

Aluminium slats

All can be used

Which metal is used for catalytic hydrogenation of oils

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Cu

Pt

Ni

Pd

Variable valency is characteristic of

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Halogen

Transition elements

Alkali metals

Noble gas

Azeotropic mixture of HCl and water has

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48% HCl

22.2% HCl

36% HCl

20.2% HCl

Which isomers of C₅H₁₁OH gives, on dehydration, the greatest number of different alkenes

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The difference between amount of heat actually released and that of calculated is called

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Bonding energy

Activation energy

Resonance energy

Transition energy

Which of the following human activities are contaminating surface and ground waters

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Pesticides

Septic tanks

Petroleum and natural gas production

All of these

A solution contains 1.2046 x 10²⁴hydrochloric acid molecules in one dm³of the solution. The strength of the solution is

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6 N

2 N

4 N

8 N

Which is the chain isomer of n-pentane

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Isopentane

Neopentene

N-pentene

Isopentene

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