Question # 1

covalent network of crystals has:

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lower melting point than molecular crystals

higher melting point than molecular crystals

H-bonding

All of the following are essential amino acids except

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Lysine

Aspartate

Tryptophan

Hisitidine

Triglyceride have iodine number ______ having no double bond

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0

2

3

4

An ideal gas, obeying Kinetic theory of gases cannot be liquified, because

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its critical temperature is above 0°C

its molecules are relatively small in size

It solidifies before becoming a liquid

Forces acting between its molecules are negligible

The toxic organic compounds and heavy metals and metalloids results in contamination of

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surface water

ground water

both surface and ground water

neither surface nor ground waters

Covalent bonds are

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directional

Bidirectional

Multidirectional

Non directional

Transportation causes to produce CO₂ in atmosphere:

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72%

73%

74%

75%

This is known fact that the molar volumes of different gases at S.T.P. are

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much larger than the molar volumes of liquids and solids

little bit less than the molar volumes of solids

about the same as the molar volumes of liquids

little bit greeter than the molar volumes of liquids

Which solids are called true solids

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Crystalline

Vitreous

Amorphous

Metallic

It is a biodegradable pollutant

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Salts of HG

DDt

Aluminum foil

Domestic fuel

Glycerine is a polar compound. It boils at 290°C under one atmospheric pressure. It should be distilled under reduced pressure due to reason that

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there are strong intermolecular forces between molecules of glycerine

it decomposes at 290°C

low pressure makes the liquid to boil at high temperature

the reduced pressure decreases the boiing point of liquids

Equal volumes of ethylene glycol (molar mass = 62) and water (molar mass = 18) are mixed. The depression in freezing point of water is (given K_rof water = 1.86 K mol^-1kg and specific gravity of ethylene glycol is 1.11)

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0.003

3.33

0.333

33.3

Which are used as essences(flowers)?

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aldehydes

Ketones

alcohols

esters

One mole of ethanol and one mole of ethane have an equal

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Mass

Number of atoms

Number of electrons

Number of molecules

The general formula of amino acids is

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A solution contains 1.2046 x 10²⁴hydrochloric acid molecules in one dm³of the solution. The strength of the solution is

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6 N

2 N

4 N

8 N

The rate of reaction b/w two specific time intervals is called :

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Instantaneous rate of reaction.

Average rate of reaction.

Rate of a reaction.

Minimum rate of a reaction.

When fused PbBr₂is electrolyzed

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Bromine appears at he cathode

Lead is deposited at the cathode

Lead appears at the anode

None of these happens

Reactions that proceed on both sides and never go to completion are called

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Irreversible reactions

Reversible reactions

Opposing reactions

Spontaneous reactions

Hydrogenation of vegetable oils is accelerated by Ni catalyst. The catalytic activity of Bi is increased by a promoter of activator which is

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Na and K

Na and Hg

Hg and Zn

Cu and Te

Octane number can be changed by

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Isomerisation

Alkylation

Cyclisation

All of these

Poly hydroxyl compounds of aldehyde and ketones are:

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Carbohydrates

Proteins

Fats

Lipids

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