Question # 1

Which of the following is a non-typical transition element?

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Cr

Zn

Mn

Fe

State of hybridization of carbon in the carbocation is

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sp3

sp

sp2

dsp2

Which of the following is a thermosetting plastic?

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PVC

polyethylene

polystyrene

melamines

Which of the following is correct for epoxy resin

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Coating material for thermal power stations

It give chemical resistance

Epichlorohydrin is monomer

All of these

The destiny of a gas is directly proportional to pressure, inversely proportional to temperature and directly proportional to:

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Viscosity

Molar mass

Momentum

All of above

Ozone layer is high:

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20-23 km

22-25 km

23-26 km

25-28 km

The boiling point of radon (211 K) is higher than boiling point of Helium (4.4 K) because

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the atomic number of Rn is larger than that of the He

the atomic mass of Rn is larger than that of He

the dispersion forces between Rn atoms are more prominent that between He atoms

Rn atoms are joined by dipole-dipole force whereas He atoms are joined by hydrogen bonding

Surface and ground water sources are contaminate by various human activity. which of the following is not a human activity that causes contamination in fresh water?

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rain

live stock waste

oil leaks and spills

disposal of industrial effluents

Rancidification of facts and oils is due to:

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oxidation reaction

hydrolysis reaction

both a and b

hydrogenation reaction

Covalent bond is

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A weak bond

A true chemical bond

A hydrogen bond

Responsible for secondary structure of protein

If increase in temperature and volume of an ideal gas is two times, then the initial pressure P changes to

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4P

P

2P

3P

The human body can synthesize ______ amino acids

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1

10

20

19

Caroxyl group has functional in it.

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one

two

three

four

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Fe is reduced

Fe is oxidized

Cl₂is oxidized

None of these

It is common observation that rates of chemical reactions differ :

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Greatly.

A little bit.

Moderately.

The value of Plank's constant 'h' is

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6.625 x 10^-34

6.625 x 10^-34J sec

6.625 x 10^-34KJ

6.625 x 10^-34K Cal

SO₂Makes ______ acid rains

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Carbonic acid

Sulfuric

Nitric acid

All of these

When of the following is isolelectronic with krypton

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Ca⁺⁺

Al⁺⁺⁺

Br^-1

I^-1

The acid which has a peroxy linkage is

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Sulphurous acid

Pyrosulphuric acid

Dithionic acid

Caro's acid

The most reactive compound for electrophilic nitration will be

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Benzyl chloride

Benzoic acid

Nitrobenzene

Chlorobenzene

The chemical reactivity of glass is reduced by the use of

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Fluxes

Formers

Stabilizers

None of these

Refrectrometric method is used when

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Reactions involving absorption of I.R. or U. V

Reactions involving change of refractive index

Reactions involving ions

Change of optical activity

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