Question # 1

Which of the following pairs of not form a dative covalent bond to each other?

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NH₃ and H⁺

H₂O and H⁺

NH₃ and BF₃

CH₄ and AICI₃

Which noble gas is used in mixture used for breathing by divers?

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Ge

Ar

Kr

He

The normal amount of overhead ozone is about in DU:

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150

250

350

450

If temperature is 73K and volume is 146 cm3 then calculate the value of K=V/T

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5

4

3

2

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

Alpha helix and beta pleated sheath are secondary structures of protein which are maintained by

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dipole forces

non-polar interactions

ionic bonds

Hydrogen bonds

Exposure to CO results in

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Headche

Fatigue

Unconsciousness

All of these

The pH of ideal buffer is

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10

7

Less than 7

0

The solid particles posses only ______ kinetic energy

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Translational

Rotational

Viberational

Circular

Which one of the following has zero dipole moment

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NH3

CHCI3

H2O

BF3

Crystal can be classified in to ......basic crystal habits

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7

4

14

3

Which is not a fossil fuel

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Petroleum

Coal

Natural gas

None of them

Which of the following is a product of destructive distillation of coal

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Ammonia

Coke

Cyanides

Kerosene

The ionic product of H⁺ions and OH^-in water is called ionization constant of water Kw. The value of Kw at 25°C is

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0.11 x 10^-14

0.30 x 10^-14

1.0 x 10^-14

3 x 10^-14

Which of the following is a transition element

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Sr

Sn

Cr

Pb

Which metal is used for catalytic hydrogenation of oils

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Cu

Pt

Ni

Pd

Which is the longest period of the periodic table

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5th

7th

6th

2nd

Common names of carboxylic acids are given by then:

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Source

Person discovered

place

habit

Which of the following ion has the highest value of ionic radius?

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Li⁺

F^-

O^2-

B³⁺

The condition for standard enthalpy change is

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1 atm 30°C

1 atm 50°C

1 atm 25°C

760 atm 25°C

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Moles^-2dm⁺⁶

No units

Mole dm^-3

Mole^-1dm^-3

Each of the following compounds is effective as a refrigerant. The release of which one of these causes the greatest depletion of the ozone layer

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CCl₂F₂

CH₃OCH₃

CH₃CHF₂

CH₃CH₂CH₃

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