Question # 1

The wave number of the light emitted by a certain source is 2 x 10⁶m^-1The wave length of this light is.

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500 nm

500 m

200 nm

600 m

The line of the balmer series in the visible region of the spectrum, but the limiting line, in the series lies in

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Visible region

X-Ray region

I.R region

U.V. region

The boiling point of water at the top mount Everest is.

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59^oC

69^oC

83^oC

75^oC

The atomis radius is of the order of

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10^-8cm

10⁸cm

10^-12cm

10^-10cm

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

What happens to the enthalpy change when the coeffficients of a chemical equation are douubled

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It doubles

It becomes half

It does not change

It cannot be predicted

A filtration process could by very time consuming if it were into aided by a gentle suction which is developed.

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If the paper covers the funnel upto its circumference

If the paper has got small sized pores in it.

If the stem of the funnel is large so that it dips into the filtrate

If the paper fits tightly

Oxidation number of phosphorus in the compound is.

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+3

+4

+5

+6

The influence of temperature on reaction rate is predicated by

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Free energy change of reaction

Arrhenius equation

Van der weal's equation

Kinetic equation

NH3 shows a maximum boiling point among the hydrides of V-A group elements due to.

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Very small size of nitrogen

Lone pair of electron present on nitrogen

enhanced electronegative character of nitrogen

Pyramidal structure of NH3

Gas molecules show more deviation from ideal behaviour at high pressure because.

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Velocity of molecules increases

Velocity of molecules decreases

Force of attraction between molecules increases

Force of collision per unit area increases

The comparative rates at which the solutes move in paper chromatography depend on.

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The size of paper used

Rf values of solutes

Temperature of the experiment

Size of the chromatographic tank used

In triclinic unit cell

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All axial lengths are equal

All internals lengths and angles are equal

Both axial lengths and angles are equal

Both axial lengths and angles are unequal

Solvent extraction is an equilibrium process and is controlled by.

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Law of mass action

The mount of solvent used

The amount of solute

Distribution law

Gooch crucible is made of.

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Glass

Paper

Teflon

Procelain

Dipole Moment of H2O is.

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1.61 D

1.85 D

0.95 D

1.49 D

The tendency of an tom to attract shared pair of electron towards itself is called its.

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Ionization energy

Electronegativity

Electron affinity

dipole moment

During combustion analysis, CO2 produced is absorbed in

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Mg (CLO4)2

50% KOH

CaCl2

P2O5

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