Question # 1

CFC's are known to cause depletion of ozone layer therefore their use has been banned in refrigerators and air conditioners. Which alternate compound may be suitable to replace CFC

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CCl₄

CHCl₃

CH₃- CH₂- CH₂- CH₃

CHCl₂- CHF₂

The energy difference of d-orbitals varies from

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Atom to atom

lon to ion

Electron to electron

proton to proton

The yellow color present in the photo chemical smog is due to presence of the

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Carbon dioxide

Nitrogen dioxide

Chlorine

All

Enthalpy of formation of one mole of ionic compound form gaseous ion under standard condition is called

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Gibb's energy

Bond energy

Lattice energy

Ozone is present in layer around earth:

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atmosphere

tropospher

stratosphere

thermosphere

Amorphous solids

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have sharp melting points

undergo clean cleavage when cut with knife

have perfect arrangement of atoms

can possesses small regions of orderly arrangements of atoms

NH₃shows a maximum boiling point among the hydrides of Vth group elements due to

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very small size of nitrogen

hydrogen bonding between its molecules

enhanced electronegative character of nitrogen

pyramidal structure of NH₃

Potable water is considered to be:

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safe for human consumption

the ground water

the Surface water

now water is due to the salt of:

Helical structure of protein is stabilized by

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Peptide bond

Dipeptide bond

Van der wall's forces

Hydrogen bonding

Only those metals can replace Hydrogen from dilute acids, which have

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High negative reduction potential

Low negative reduction potential

High positive reduction potential

low positive reduction potential

Why is carbon monoxide called as pollutant? The reason is that

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It combines with oxygen

It combines with haemoglobin

It inactivates glycolysis

It inactivates nerves

Enzymes catalyse all biological reactions occurring in the cell. What is true about an enzyme

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Enzyme is a small molecule

Enzyme is acidic in nature

Enzyme is a protein

Enzyme is a lipid

Group VIB of transition elements contains

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Zn, Cd, Hg

Fe, Ru, Os

Cr, Mo, W

Mn, Te, Re

Kolb's method is not useful for the production of

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Methane

Ethane

Propane

Butane

When during electrolysis of a solution of AgNO₃, 9650 coulombs of charge pass through the electroplating bath, the mass of silver deposited on the cathode will be

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1.08 g

10.8 g

21.6 g

108 g

A free radical reaction takes place in three steps, initiation, propagation and terminations. Which of the following expression represents a propagation step

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In endothermic reactions, the heat content of the

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Products is more than that of reactants

Reactants is more than that of products

Both a and b

None of the above

Electrolytes in the form of solution or in the fused state have the ability to conduct :

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Light.

Electricity.

Ions.

Electrons.

The wave length of electron as wave is 0.5 nm. What is the wave length in meter

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5 x 10^-9

5 x 10^-12

5 x 10^-6

5 x 10^-10

A special application of the Hess's law to binary ionic compounds of M⁺X^-type in calculation of their lattice energies is

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Enthalpy of reaction

Born-haber cycle

First law of thermodynamics

Enthalpy of combustion

Which are used as essences (flowers)?

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Aldehydes

Ketones

Alcohols

Esters

Which of the following is an aromatic compound

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Propanol

Cyclohexane

Acetone

Benezene

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