Question # 1

The enthalpy of reaction H2+I2--- 2HI

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-571.6 k J

+53.8 kJ

11 kJ

-393.5 kJ

The reaction in which the products do not reombine to form reatants are called

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Addition reactions

Decomposition reactions

Irreversitble reactions

reversible reactions

The branch of science helps to understand chemcial product andprocess that reduce the use of hazadous substances.

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Green chemistry

Astrochemistry

Analytical chemistry

Physical Chemistry

Which is not produced in an aerobic respiration.

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Carbon dioxide

Lactic acid

Water

Energy

The branch of chemistry that focuses on the study of polymers, their types properties, uses is called.

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Industrial chemistry

Polymer chemistry

Organic chemistry

Astrochemistry

Which group of the periodic table has the tendency to gain electrons.

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Group -1

Group -17

Group-2

Group -18

What mass of 95% CaCO3 will be requred to neutralize 50 cm 3 of 0.5 M HCl solution.

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9.5 g

1.45 g

1.32 g

1.25 g

1 gram formula of NaCl contan is grams.

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100 g

58.5 g

32 g

49 g

In metals, the hold of nucieus over the valence shell elecrons is veak due to.

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Highlectron affinity

Large sized atoms

High ionization energies

All of the above

--------------- acts a catalyst promoting the breakdown of ozone.

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I2

Br2

Cl2

None

Which of the following is Bronsted base?

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HCl

CH3COOH

H2O

NH3

The solubility of which salt decreases with the increase of temperture.

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KNO3

Li2SO4

KCl

NaNO3

How many elecntrons are present in the valence shell of group 1 elements.

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1

2

3

4

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