Question # 1

As the quantum number n increases, the energy difference between adjacent energy level.

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Increase

Remain same

Decrease

No correlation

Positive rays were discovered by.

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J.J.Thomson

Goldstein

Ruther ford

William Crookes

Oxidation number of carbon in NaHCO₃

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+4

-6

+6

+2

The bond angle in NH3 molecule is

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109.5^o

107.5^o

104.5^o

106^o

Rutherford's model of atom failed because

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The atom did not have a nucleus and electrons

It did not account for the attraction between protons and neutrons

It did not account for the stability of the atom

There is actually no space between the nucleus and the electrons

Cathode rays strike alumina and produce a ..........colour.

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Red

Blue

Yellow

Green

Feeling uncomfortable breathing in un pressurized cabins is due to

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High pressure of CO2

Fatigue

Low pressure of O2

Low presssure of CO2

Which one of the following has no tendency of form coordinate covalent bond with H+

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NH3

H2O

CH4

CH3OH

If the salt bridge is not used between two half cells, then the voltage

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Decreases rapidly

Decreases slowly

Does not change

Drops to zero

Ionic solid are characterized by.

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Low melting point

Good conductivity in solid state

High vapours pressure

solubility in polar solvent

Kw for water at 0 oc is 0.1 x 10^-34 and at 100 ^oC 7.5 x 10^-14, How many times dissociation of water increase from 0 ^oCto 100 ^oC

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7.5 times

50 times

75 times

100 times

Which of the following substances is used as decolorizing agent.

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Silica gel

Animal charcoal

conc. H2SO4

Asbestos

Which of the following has linear structure.

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CO2

NH3

CH4

H2O

The molecules of a gas show more deviation from ideal behaviour at low temperature, because

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Attractive force dominate at low temperature

Kinetic energies are increased

Collisions become less frequent

Densities of the gases increase

The pH of 10^-3mol dm^-3of an aqueous solution of H₂SO₄is

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3.0

2.7

2.0

1.5

Which compound does not obey the octet rule.

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NH3

BCl3

H2O

CH4

The carbon atom is C2H4 is.

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sp3 hybridized

sG2 hybridized

Sp hybridized

dsG2 bybridized

How many allotropic forms are present in carbon

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Two

Three

Four

Five

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