Question # 1

Substance that does not show the process of sublimation is

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K2Cr2O7

iodine

naphthalene

NH4CI

A polymer of PVC having D.P 500 has molar mass:

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6300

63000

3150

31500

solubility of carboxylic acids decreases in water with increase in molar mass because

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Bigger molecules are more polar

bigger molecules have bigger non-polar groups

bigger molecules make more hydrogen bonds

bigger molecules can form lesser hydrogen bonds/molecule

Air pollution causes

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Acid rain

O₃ depletion

Green House Effect

All

The Sl mechanism for the hydrolysis of an alkyl halide to an alcohol involves the formation of

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Carbocation

Carbanion

Pentavalent carbon in the transition state

Free radical

Liquids are less common than solids and gases because

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They exist in narrow range of temperature and pressure

They have definite volume

Liquid molecules can slide past each other

Molecules contain three type of motion

Acetic acid is obtained from:

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Red out

Vinegar

Butter

Milk

A system absorbs 100 kJ heat and performs 50 kJ work on the surroundings. The increase in internal energy of the system is

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50kJ

100 kJ

150kJ

5000 kJ

The lattice energy of NaCl is

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787 j/ mole

790 kj/mol

780 kJ/ mol

-787 kI / mole

The most unsymmetrical one in crystal system is

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triclinic

Li, Na, K

monoclinic

hexagonal

The other name for cross linked polymers is

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Linear polymer

Branched polymers

Inter connected polymers

None of these

Which of the following is weakly acidic in nature

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Alcohol

Phenol

Aidehyde

Amide

NO and NO₂gases in atmosphere are represented by

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NO

NO₄

NO_x

N_xO_y

How many are the zones through which the charge passes in a rotary kiln?

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4

3

2

5

Ozone hole is maximum over

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Europe

Antarctica

Asia

Africa

Hydrocarbons are divided into aliphatic, alicyclic and aromatic which structure among the following show an alicyclic hydrocarbon

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The structure of benzene is

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Hexagonal

Pyramidal

Square planer

Tetrahedral

Which of the following elements have the largest radius

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F

Cl

Br

l

Mercury is the only metal which is liquid at 0°C. this is due to its

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Very high ionization energy and weak metallic bond

Low ionization potential

High atomic weight

High vapour pressure

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Shift reaction toward forward direction

Shift reaction backward

Lower the value of K_c

No change in reaction

Which of the following transition metal ions will have definite value of magnetic moment?

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Se³⁺

Ti³⁺

Cu⁺

Zn²⁺

Formula of acetone is:

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HCHO

CH₃CHO

CH₃OCH₃

CH₃OC₂H₅

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