Question # 1

Which of the following solids has a simple molecular lattice?

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magnesium oxide

sodium

silicon(IV) oxide

sulphur

If a gas expands at constant temperature

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The pressure decreases

The Kinetic energy of the molecules remains the same

The kinetic energy of the molecules decreases

The number of molecules of the gas increase

Asbestos is commonly used in making

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wall board

black board

soft board

hard board

Ecosytem is a smaller unity of:

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nydosphere

biosphere

lithosphere

atmosphere

According to kinetic molecular theory, kinetic energy of molecules increases when they are:

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melted from solid to liquid state

frozen into a solid

condensed into liquid

mixed with other molecular at low temperature

Polumerization process was classified by

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W.H. Garold

William Hackel

W.H. Carothers

H. Carothers

Oxidation of secondary alcohol produces

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Aldehyde

Ketone

Alkyl halide

Ester

Born-Haber cycle is an application of

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Hess's law

1" law of thermodynamics

Avogadro's law

1law of thermochemistry

How is the secondary structure of protein stabilized

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Through hydrogen bonding

Through ionic bonding

Through van der wall forces

Through covalent bonding

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will

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remain unchanged

increase four times

reduce to 1/4

be doubled

Hydrogen diffuses six times faster than gas A.The molar mass gas of gas A is

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72

6

24

36

Which is an essential constituent of chlorophyll

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Be

Fe

Mg

Ca

One of the environmental problem is the formation of oil slicks when oil is spilled from tankers in sea water. Which treatment is suitable to remove oil slicks

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Blow air

Add Na₂CO₃

Use a specially made sorbent having flouring trapped in it

Use a sorbent having Al₂O₃trapped in it

Statement enthalpy of combustion of H₂is -285.8 KJ mole^-1then which is the standard enthalpy of formation of water

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+285.8 KH mole^-1

-285.5 KJ mole^-1

Zero

-218 KJ mole^-1

When acetamide is hydrolysed by boiling with acid the product obtained is

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Ethyl amine

Ethyl alcohol

Acetic acid

Acetaldehyde

The stroids of fungi and yeast and yeast are called:

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Vitamin D

Vitamin D₂

Ergostrol

Cholestrol

In azeotropic mixture showing negative deviation form Raoult's law show

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Higher b.p. than either

Lower b.p. than either

No change in b.p.

None of these

Boiling point of n-butane is:

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-102°C

-75°C

-55°C

55°C

A zero order reaction is one in which :

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Rate is not affected by changing concentration of reactants.

concentration of reactants do not change with the passage of time.

Reactants do not react.

One reactants in large excess.

The acid showing salt like character in aqueous solution is

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Acetic acid

Benzoic acid

Formic acid

α - Aminoacetic acid

Factors affecting quality of water:

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D.O

BOD

COD

All of these

Coal is obtained from dead remains of

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Plants

Animals

Both a and b

None

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