Question # 1

Polysaccharides are

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Polyester

Polyamides

Poly ethers

Polynucleotide

If an endothermic reaction is allowed to take place very rapidly in air, the temperature of the surrounding air will

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Remains constant

Increase

Decrease

Either increase or decrease

One Joule is equivalent to

Glycine is characerized by

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Absence of an asymmeteric carbon

Absence of optical activity

The shortest amino acid

All of these

Ozone is effectively removed by

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TNT

CFCs

PVC

CNG

The number of atoms in 0.004 g of magnesium is close to

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24

2 x 10²⁰

10²⁰

6.02 x 10²³

To measure the true pressure of a gas collected over water, the pressure due to water vapoure is:

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added to the total pressure

multiplied to the total pressure

divided by the total pressure

subtracted form the total pressure

The change in enthalpy of a system when one mole of the substance is completely burnt in excess of air or oxygen is called

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Heat of reaction

Heat of formation

Heat of atomization

Heat of combustion

Benzene has pi electron

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2

4

6

8

In aldehydes and ketones carbon of carbonyl group is;

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sp³ hyhridized

sp² hybridized

sp hybridized

un hybridized

For an ideal gas,number of moles per litre in terms of its pressure P,gas constant R and temperature T is

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PT/R

PRT

P/RT

RT/P

Part of fresh water consumed in industry is:

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1%

2%

69%

23%

Which of the following half molar solutions will have lowest freezing point

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Solution of non-volatile, none electrolyte

Solution of non volatile, weak electrolyte

Solution of non volatile strong electrolyte

Solution of volatile, non electrolyte

During electrolysis of KNO₃, H₂is evolved

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Anode

Cathode

Both a and b

None

The rate of reaction determined at a given time is called

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Average rate

Instantaneous rate

Specific rate

Overall rate

Chloroform is carcinogenic:

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Heart

Lungs

Liver

Kidney

Biodegradable pollutant is

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Plastic

Asbestos

Sewage

Mercury

If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be

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0, 1, 2, 3

+3, +2, +1, -1, -2, -3

0, -1, -2 ,-3

-3, 0, +3

Alkyl benzenes are readily oxidized by axidfied

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KMnO₄

K₂CO₃

MnO₄

H₂SO₄

How many molecules of chlorine adds in benzene in the presence of sunlight

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One

Two

Three

Four

Give IUPAC name fo Acetone

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Ethanal

Propanone

Butanone

Propanal

Under what condition of temperature and pressure the formation of atomic hydrogen from molecular hydrogen will be favourd

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High temperature and high pressure

Low temperature and low pressure

High temperature and low pressure

:Low temperature and high pressure

Iodoform test is given by:

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Formaldehyde and Higher ketones

Formaldehyde

Acetaldehyde and methyl ketones

Acetaldehyde

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