Question # 1

The molecular mass of a polymer is obtained by multiplying mass of the monomer unit with the degree of polymerization, The degree of polymerization of PVC is 1000.What is molecular mass?

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65000

63000

62000

60000

All gases can be compressed by:

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Keeping constant pressure

Decreasing pressure

Increasing pressure

None of above

The reagent used to distinguish between ethanol and propanal is

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I2/ NaOH

Benedict's reagent

LiAIH

sodium nitroprusside

Which group activates the benzene ring

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-COOH

-COR

-CHO

-OH

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

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remains unchanged

increases unchanged

reduces to 1/4

increases 4 times

The density of ice is 1.00gcm^-3.

What the volume of steam produced when 1.00-3 of ice is heated to 323^{∘C (596K) at a pressure of one atmosphere (101kPa)?}

[1 mol a gas occupies 24.0dm³ at 25a^∘C(295K)and one atmosphere.]

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0.267 dm³

1.33 dm³

2.67 dm³

48.0 dm³

The gases H₂, O₂, H₂S and SO₂diffuse in the order

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SO₂>H₂S>H_2>O₂

H₂S>SO₂>O₂>H₂

O₂>SO₂>H₂>H₂S

H₂>O₂>H₂S>SO₂

One of the following is a ionic solid. Which is that?

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Fe

KBr

Diamond

Cr

On adding NH3 to water

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lonic product will increase

[H3O+] will inerease

lonic product will decrease

[H3O+] will decrease

When light is exposed to transtion element, then electrons jump from lower orbitals to higher orbitals in

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Orbitals of s-subshell

Orbitals of d-subshell

Orbitals of p-subshell

between different shells

The most important pesticides are:

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Herbicides

Insecticides

Fungicides

All

Baking powder has which one of the following formula

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Na₂CO₃

Na₂SO₄

NaHCO₃

K₂CO₃

The change in concentration of reactant or product per unit time is called :

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Rate constant.

Rate of reaction.

Rate equation.

Rate law.

Which of the following is a method of converting a unsaturated ketone into unsaturated hydrocarbon?

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Aldol condensation

Reimer Tiemann reaction

Cannizaaor's reaction

Wolf-kishner reduction

The formation of compounds like PF₅, BCI₃, SF₆indicates that

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These halides are ionic

These halides are covalent

They are Lewis acids

Octet rule not obeyed so the rule is not universal

Objects of the size of an atom can be observed in

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An electron microscope

An x-ray spectrum

Atomic absorption spectrum

A visible spectrum

Which of the following cannot conduct electricity :

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NaCl fused.

NaCl(aq)

NaCl(Solid)

Both (b) and (c)

The most acidic of the following compounds is

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P₂O₃

Sb₂O₃

B₂O₃

As₂O₃

Most hazardous metal pollutant of automobile exhaust is

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Mercury

Lead

Cadmium

Copper

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A strong reducing agent

A strong oxidising agent

Better oxidising agent than hydrogen

Less reducing agent than hydrogen

The amount of heat evolved or absorbed by keeping reactants and products at one atmospheric pressure at room temperature is called

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Heat of formation

Standard heat of formation

Standard enthaply change

None

The solution of which acid is used for seosoning of food ?

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Formic acid

Acetic acid

Benzoic acid

Butanoic acid

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