Question # 1

Which group activates the benzene ring

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-COOH

-COR

-CHO

-OH

The value of R is SI units is

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0.0821 dm³. atm. J^-1mole^-1

62.4 dm³torr K^-1mole^-1

8.31 dm³atm. K^-1mole^-1

8.31 JK^-1mole^-1

Temperature at which molecular motion ceases is called

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Absolute zero

Absolute temperature

Critical temperature

Difficult to predict

Lecithin is an example of:

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A simple lipid

Phospholipids

Waxes

Proteins

The layer of earth around the earth is called:

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Atmosphere

Hydrosphere

Lithosphere

Biosphere

Factors affecting quality of water:

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D.O

BOD

COD

a,b,c

During the nitration of benzene the nitrating agent is

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NO3

NO2+

NO2-

HNO3

The system in which all the three axes are unequal and are at righ angle to each other is called

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cubic

hexagonal

orthorhombic

tetragonal

The decomposition of N2O4 to NO2 is carried out at 280°C in chloroform. When quilibrium is reached. 0.2 moles of N2O4 and 0.02 mole of NO2 are present in 1:1 ratio The equilibrium constant for the reaction N2O4------> 2NO2 is

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0.01

0.001

0.02

0.002

The water is considered to be polluted when the concentration of oxygen in it is

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6 - 9ppm

6 ppm

8 ppm

Less than 4pm

What is the co-ordination number of face centered cubic structure?

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12

8

6

10

Acetone reacts with HCN to form a cyanohydrin. It is an example of

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Which one of the following reaction rate is effected by the light

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Water H₂O is liquid while hydrogen sulphide H₂S is a gas beause

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Water has higher molecular weight

Hydrogen sulphide is a weak acid

Sulphure has high electronegativity than oxyhe

Water molecules associate through hydrogen bonding

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300 cm³

200 cm³

150 cm³

100 cm³

Which of the following is a typical transition metal

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Sc

Y

Ra

Co

Which decolourizes the colour of Br₃

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CH₄

CH_3-CH₃

CH_3-CH_3-CH₃

CH₂₌CH₂

The quantitative relationship between the substances according to balanced equation describes

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Reversible reactions

Stoichiometry

Limiting reacting

Percentage composition

Which reaction is too vigorous to control

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Chlorination

Bromination

Iodination

Fluorination

Which of the following is not an air

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N₂

N₂O

NO

CO

Heat absorbed by a system when its volume does not change is equal to

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Internal energy of system

Enthalpy of system

Increase in internal energy of system

Increase in enthalpy of system

Hydrolysis of potassium acetate produces

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Acidic solution

Neutral solution

Basic solution

None of these

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