Question # 1

H2O and HF are the hydrides of the second period. Fluorine is more electronegative than oxygen. Anyhow, the boiling point of water is greater than that of HF. This is due to:

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water is more polar than HF

water has a bent structure

HF has a zig zag structure after making hydrogen bonding

the number of hydrogen bonds produced by water are greater than that of HF

The values of ∆H for the process l(g)+e-1--------->
I-1(g) is:

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>0

<0

0

None

All are dicarboxylic acids except

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Oxalic acid

Malonic acid

Picric acid

Tartaric acid

The number of molecules in one dm³of water is close to:

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6.02/22.4 x10²³

12.04/22.4 x10²³

18/22.4x 10²³

55.6x6.02x10²³

What types of bonds are broken when water turns into steam on heating?

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covalent

permanent dipole interactions

hydrogen bonds

induced dipole interactions

Which substances do nto react immediately with bromine water:

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ethane

benzene

ethene

phenol

Equal volume of all gases at same temperature and pressure contain number of molecules

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different

multiples

equal

in fractions

In the reaction A2 (g) + 4B2 (g) <-----------> 2AB4 (g) such that ∆H < 0, the formation of AB4(g) will be favoured at

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Low temperature and high pressure

Low temperature and low pressure

High temperature and low pressure

High temperature and high pressure

Dehydrogenase is an example of

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ligase

oxidoreductase

lyase

hydrolase

Chlorofluorocarbons and aerosols are inert in sphere:

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troposphere

stratosphere

lithosphere

hydrosphere

In order to mention boiling point of water at 110∘C the external pressure should be:-

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between 760 torar an 1200 torr

between 200 torr and 760 torr

765 torr

any value of preessure

When electrically is passed through molten Al₂O₃+ Na₃AlF₆and 13.5 gms of Al are deposited, the number of farady must be

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0.5

1.0

1.5

2.0

Group VA of the periodic table consists of the elements N, P, As, Sb and Bi, On passing from N to Bi, the oxides of the elements of general formula M₂O₃become

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Stronger reducing agents

More ionic

More basic

More volatile

Which of the following sulphates is not soluble in water

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Sodium sulphate

Potassium sulphate

Zinc sulphate

Barium sulphate

Primary carbon attaches with other hydrogen atoms directly:

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One

Two

Three

At least one or more than it

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Which of the following molecules have multiple bonds

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CH₄

C₂H₄

C₂H₆

CCI₄

Rosenmund's reduction of an acyl chloride gives

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An aldehydes

An alcohol

An ester

A hydrocarbon

A large value of K_cmeans that at equilibrium :

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Less reactant and more products.

Reactants and product in same amounts.

More reactants and less products.

None of above.

Which of the following is used as disinfectant

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K₂Cr₂O₇

KMnO₄

K₂MnO₄

K₂CrO₄

Complex protein molecules which catalyses the organic reactions in the living cells are called

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Living organisms

Enzymes

Viruses

Bacteria

Quantity of heat evolved or absorbed during the reaction is measured according to the equation

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