Question # 1

Which value is designated as absolute zero or zero of the Kelvin scale?

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-273.15°C

-173.15°C

273°C

none of these

Out of total amount of water available for human use is

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0.30%

0.2%

40%

50%

Dehydrohalogenation of secondary butyI bromide will give

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Propene

1-Butene

Butene

2-Butene

Which element exists as discrete small molecules in the solids state

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Aluminum

Silicon

Iodine

Sodium

A single chlorine free radical can destroy how many ozone molecules

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100

100000

10000

10

Which of the following is the repeating monomeric unit in cellulose?

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sucrose

maltose

cellobiose

glucose

LiF is a crystalline substance and has

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ionic crystal

metallic crystal

covalent crystal

molecular crystal

What is the mass of 10²⁰molecules of CO₂at STP?

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7.3 x 10^-3g

7.9 x 10^-3g

3.2 x 10^-3g

4.9 x 10^-3g

pH of an aqueous solution is 3.0 at 25°C. The hydrogen ion concentration in the solution would be

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0.001

0.01

0.0001

10(-5)

Which one of the following is not type of polymer:

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copolymer

homopolymer

terpolymer

hereropolymer

A polymer of polyvinyl chloride with DP 1000 has molecular or molar mass:

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630

6300

63000

630000

When rain is accompanied by a thunderstorm, the collected rain water will have a pH value

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Uninfluenced by occurrence of thuderstorm

Which depends on the amount of dust in air

Slightly lower than that of rain water without thunderstorm

Slighlty higher than that when the thunderstom is not there

In the ground state of an atom the electron is present

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In the nucleus

In the second shell

Nearest to the nucleus

Farthest from the nucleus

A solution has 92 g of ethyl alcohol, 96 g of methyl alcohol and 90 g of water. Mole percentage of ethyl alcohol in the solution is

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10

20

25

50

The liquid obtained after passing the mixture through filter paper is termed as :

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Extract.

Residue.

Filtrate.

Sample.

Silicon atom is hybridized:

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sp

sp²

sp³

dsp²

The solution left after the formation of crystals is called :

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Residue.

Filtrate.

Mother liquor.

None of these.

In cold countries ethylene glycol is added to water in radiators of cars during winter. It results in

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Lowering in b.pt

Reducing viscosity

Reducing specific heat

Lowering in freezing pt

When the rate of formation of reactants is equal to the rate of formation of products, this is known as

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Chemical reaction

Chemical equilibrium

Chemical kinetics

None

The number of atoms present in molecule determines its:

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Molecularity

Atomicity

Basicity

Acidity

On heating acetaldehyde with ammonical silver nitrate solution, we get

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CH₃OH

Silver acetate

HCHO

Silver mirror

Which of the following is fully fluorinated polymer?

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Neoprene

Teflon

Thiokol

PVC

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