Question # 1

Liquefaction of gas can only be carried out if the:

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without caring for the value critical volume at critical stage

the temperature is more than critical and pressure is 1000 atm

the temperature is below the critical and pressure is very high

temperature is above the critical temperature and pressure can have any value

In which molecule. all atoms are coplanar?

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CH4

BF3

NH3

PH3

Air contains 78% N₂, 21% O₂ and 1% other gases at sea level the partial pressure of O₂ is

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760 torr

159 torr

592 torr

7.6 torr

With increase in temperature, ionic product of H2O

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Decreases

Remains same

Increases

May increase or decrease

Smaller unit of biosphere is:

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specie

ecosystem

plankton

troposphere

Tertiary aleohols producewith acidified KMno,

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Ketones

Aldehydes

Malonic acid

Alkene

Which compound shows the highest melting point

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water

Propanoic acid

Methanoic acid

Ethanoic acid

When a metal rod is dipped in its one molar ionie solution

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Electricity is produced

Electricity is consumed

Redox reaction occurs

Potential difference is set up

Rancidification of fast and oils is due to:

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hydrolysis reaction

oxidation reaction

both a and b

hydrogenation reaction

Ethyl and methyl groups are equidistant in a chain, the preference is given to?

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Ethyl

methyl

both ethyl and methyl

methyl mostly

NH₃can form only one hydrogen bond per molecule though it has three partially positively charged hydrogens

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nitrogen in NH₃has only one ions pair of electrons which can make one H-bond

ammonia is a base

ammonia is a weak acid

it ionizes to give one H⁺

Transition metals form complexes due to the participation of partially filled

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f-orbitals

d-orbitals

s-orbitals

p-orbitals

Which of the following is halo form

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CHBr₃

CHCI₃

CHI₃

All of these

The formula of curprite is

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Cu₂S

Cus

Cu₂O

CuCO₃

Which statement is incorrect for NICAD battery

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The electrolyte is alkali

Cd acts as anode

MnO₂acts as electrolyte

NiO₂acts as cathode

Which one of the following pentafluorides cannot be formed?

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PF₅

AsF₅

SbF₅

BiF₅

The range of visible spectrum is

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300 - 600 nm

600 - 900 nm

400 - 750 nm

100 - 300 nm

DDT is

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Biodegradable pollutant

Nondegradable pollutant

Not a pollutant

An antibiotic

Benzene is not prepared from

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Acetylene

Phenol

Benzoic acid

Bromo benzene

Nitroalkane are used in

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Fuel

Solvents

Organic synthesis

All of them

Identification of a substance, determination of its structure and quantitative analysis of its composition are the aspects covered by

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Modern analytical physics

Mechanical chemistry

Biochemistry

Modern analytical chemistry

The filtration process is used to to separate solid from :

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Liquid.

Gas.

Solid.

All of above.

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