Question # 1

Potable water is considered to be:

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safe for human consumption

the ground water

the Surface water

now water is due to the salt of:

In s solution 7.8 g of benzene ( C6H6 ) and 46g of toluene (C6H5CH3) is present. The mole fraction of toluene is

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1/3

1/5

2/3

5/6

When light is exposed to transtion element, then electrons jump from lower orbitals to higher orbitals in

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Orbitals of s-subshell

Orbitals of d-subshell

Orbitals of p-subshell

between different shells

Macromolecular hypothesis acceptance due to efforts of standinger came about in:

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1910

1920

1930

1940

Which one of the following does not act as pollutant?

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carbon monoxide

sulphur dioxide

hydrocarbons

carbon dioxide

Water exist in only

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One state

Two state

Three states

4 states

NH₃gas is liquefied more easily than N₂Hence

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Van der Waals constants a and b of NH₃> that of N₂

Van der Waals constants a and b of NH₃< that of N₂

a(NH₃) > a (N₂) but b (NH₃) < b(N₂)

a (NH₃) < a (N₂) but b (NH₃) > b (N₂)

Which property is associated with ionic solids?

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Solubility in polar solvents

Low melting points

Good conductivity in solid state

High vapour pressure

When a compressed gas is allowed to pass through a nozzle of a jet into a region of low pressure, it produces

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cooling

vaporization

fusion

expansion

Which is trigonal cyrstal

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BaSO₄. 4H₂O

FeSO₄

NaNO₃

None

Cyclone collector is used to reduce:

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noise pollution

air pollution

water pollution

radioactive pollution

The relation between Kc and Kp is

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Rutherford's experiment led to the discovery of

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Nucleus

Electron

Proton

alpha particle

At certain temperature, 50% of HI is dissociated into H₂and I₂the equilibrium constant is

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1.0

3.0

0.5

0.25

Result of ozone hole is

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Green house effect

Global warming

Acid rain

UV rays reach the earth

Dilatometric method is used for rate determination when

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Reactions involving change of optical

Reactions involving change of optical activity

Reactions involving small volume change

None of above

Which of these reactions is shown by buranone, CH₃COCH₂CH₃

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On warming with acidified potassium dichromative (IV) the solution turns green

On heating with Fehling's reagent a red precipitate is formed

With 2,4-dinitrophenlhydrazine reagent an orange precipitate is formed

With hydrogen cyanide an aldehyde is formed

In the ground state, an element has 13 electrons in its M shell. The element is

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Copper

Chromium

Nickel

Iron

A solution has pH = 0, its H⁺ion concentration is

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1 x 10^-14

1 x 10¹⁴

1 x 10¹

1

E = hv is the

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Spectral equation

Plank's equation

de Broglie's equation

None of these

In physical and chemical properties, transition elements show

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Similarities

Dissimilarities

Both of these

Somestimes similarities, sometimes dissimilarities

To differentiate isomers we use

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n-

iso-

neo

All of them

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