Question # 1

Calorie is equivalent to

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0.4184J

4.184J

418.4J

40.18J

When two ice cubes are pressed together they unite to form one cube. which of the following forces is responsible for holding them together?

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H-bonding

Covalent bonding

van der waal's forces

dipole-dipole interaction

Amount of heat absorbed when one mole of a solid melts into liquid form at its melting point is called:

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heat of vaporization

latent heat of fusion

molar heat of fusion

molar heat of sublimation

The number paper industries in Pakistan are:

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30

25

35

20

Which of the following gases diffuse quickly:

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N₂

NH₃

CO₂

Cl₂

Which one of the following is a powerful electrophile used to attack on the electrons of benzene ring?

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FeCl2

Cl+

FeCl-4

Cl2

Spectrometry method is applicable if a reactant or a product absorbs radiation

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Ultraviolet

Visible

Infrared

Any of these

Amount of fresh water used by agriculture is

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2%

23%

69%

97%

Absolute temperature of a gas is proportional to:

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Rotational Kinetic energy

Translational Kinetic energy

Vibrational Kinetic energy

Potential energy

Which gas is not a constituent of atmosphere?

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Xe

O₃

H₂

F₂

What is distilled first?

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Liquid CO₂

Liquid N₂

Liquid O₂

Liquid H₂

The avtive mass of 64 g of HI in a two litre flask would be

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2

1

5

0.25

A solution containing 5.8 grams acetone (CH₃OCH₃), 4.6 gram ethyl alcohol (C₂H₅OH) and 12 grams chloroform (CHl₃) has mole fraction and mole percent of acetone

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0.11, 10%

0.33, 33%

0.22, 22%

0.11, 33%

Which of the following possesses the highest melting point?

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Chlorobenzene

0-Dichlorobenzene

m-Dichlorobenzene

p-Dichlorobenzene

The oxidation number of each element of group l-A is

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0

+1

+2

-1

Across the lanthanide series, the basicity of the lanthanide hydroxides

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Increases

Decreases

First increases and then decreases

First decreases and then increases

The Mn³⁺has ______ color

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Violet

Green

Red/brown

No color

Boiling point of n-butane is:

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-102°C

-75°C

-55°C

55°C

Which of the following statements is not true?

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Isotopes with even atomic masses are comparatively abundant

Isotopes with even atomic masses and even atomic numbers are comparatively abundant

Isotopes with even atomic masses and odd atomic number are comparatively abundant

Mustard gas is a

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Gas

High boiling speed

High melting liquid

Steam

Which of the following with aqueous KOH will give acetaldehyde?

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1, 2-Dichloroethane

1,1-Dichloroethane

Chloracetic acid

Ethyl chloride

Which fills the space between needles in cement setting?

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Ca(OH)₂

Al(OH)₃

CaCO₃

MgSO₄

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