Question # 1

When a compressed gas is allowed to expand into a region of low pressure, it produce:

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Vapours

Cooling effect

Heating effect

None of above

Common names of carboxylic acids are given by then:

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Source

Person discovered

Place

Habit

The polymers which can not be re-softened again and again are called

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Thermoplastic

Thermosetting

Both a and b

None

The layer of gases around the earth are called?

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Atmosphere

Hydrosphere

Lithosphere

All of these

London dispersion forces are also called

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Ion-dipole forces

Dipole-induced dipole forces

Dipole-dipole forces

Instantaneous dipole induced dipole forces

Which one of the following statements about diamond is not true?

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the coordination number of carbon atoms is 4

diamond is an isotpe of graphite

diamond has a high melting point

diamond has a rigid tetrahedral, structure

The Complete oxidation of ethanol produces first Ethanal than

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Ethanal

Propanone

Ethanoic acid

Benzoic acid

The average kinetic energy of an ideal gas per molecule is SI units at 25°C will be

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6.17 x 10^-21 KJ

6.17 x 10^-21 J

6.17 x 10^-20 J

7.16 x 10^-20 J

No of unpaired electrons are maximum in

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V+3

Mn+2

Fe+3

Cr+3

Factors affected denaturation of proteins:

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Change in temp and pH

Strong reducing agent

Strong oxidizing agent

All of these

Chlorination of water is effective for

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Killing pathogens

Removing dust

Removing hardness

Increasing oxygen content

Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is

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dxy

dxz

dz²

dx²- y²

Benzene has a -------- structure

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Pentagonal

Hexagonal

Heptagonal

Tetragonal

On adding sodium nitroprusside ketones give

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Red

Wine red

White

Orange

Mottling of teeth is due to presence of an element in drinking water

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Mercury

Fluorine

Boron

Chlorine

The unit of rate of reaction is

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mole dm^-3

mole Kg^-1

moles dm^-3sec^-1

grams dm^-3

Which of the following is a transition element

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Sr

Sn

Cr

Pb

Which one of the following substances is used to decolourizing agent

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Abestos

Animal charcoal

conc. H2SO4

Silica gel

Reaction of Grignard's reagent with ketones gives: Reaction of Grignard's reagent with formaldehyde gives:

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Pri-alcohol

Sec-Alcohol

Ter-alcohol

Carboxylic

For the above reaction the relationship b/w k_c and k_p will be :

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K_p = K_cRT

Kp = K_c(RT)_-1

K_p = K_c(RT)_-2

K_c = K_p

Atomic number of Al is 13. When it forms ionic bond with oxygen the number of electrons lost by 1 Al atom is

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1

2

3

4

What will be the molarity of solution if 103 g (NH₄)₂SO₄is dissolved per 600 cm³of water

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2.32 M

3.32 M

4.32 M

1.30 M

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