Question # 1

Al is the most element in earth crust:

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O

Si

Al

Pb

The molal elevation constant is the ratio of the elevation in boiling point to

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Molarity

Molality

Mole fraction of solute

Mole fraction of solvent

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N₂O₄is limiting reactant

N₂H₄is the limiting reactant

Reactants are completely converted to the products

Reactions is reversible

Substances that tend to decrease the activity of enzymes are called

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Coenzyme

Activators

Inhibitors

Apoenzyme

The acid used in lead storage cells is

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Phosphoric acid

Nitric acid

Sulphuric acid

Hydrochloric acid

The number of antibonding electron pairs in O^2-molecular ion on the basis of MOT is

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4

3

2

5

Due to the bacterial action on wood it is converted into

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Peat

Lignite

Bituminous coal

Anthracite

Treatment of a secondary alcohol with a suitable oxidizing agent (K₂Cr₂O₇) results in the formation of

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Ketone

Aidehyde

Ether

Alkyl halide

Which of the following will be good conductor of electricity

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Pure distilled water

Molten NaCl

Dilute solution of glucose

Chloroform

Which of the following is not true for metalloids

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They are borderline elements that exhibit both metallic and non-metallic properties to some extent

They usually act as electron donors with non-metals and as electron acceptors with metals

Some of these elements are boron, silicon and germanium

They are good conductors of heat and electricity

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 force which holds the atoms together to form a compound is called

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A chemical bond

Van der waal's force

Dispersion force

London force

Wacker method involves the conversion of alkene using PdCl₂into corresponding

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Alcohol

Ketone

Aldehyde

Ether

To get DDT, chlorobenzene has to react with one of the following compound in the presence of conc.H₂SO₄

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Trichloroethane

Dichloroacetone

Dichloroacetaldehyde

Trichloroacetealdehyde

The chemical method used for determination of rate of reaction is

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Spectroscopic

Conductiometric

Refractometric

Titration

What happens when reaction is at equilibrium and more reactant is added :

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Forward reaction rate is increased.

Forward reaction rate is decreased.

Backward reaction rate is increased.

Equilibrium remains unchanged.

When of the following is isolelectronic with krypton

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Ca⁺⁺

Al⁺⁺⁺

Br^-1

I^-1

Ethyl bromide on treatment with alcoholic KOH gives

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Ethylene

Ethanol

Acetic Acid

Ethane

Which of the following is a colligative property?

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Melting point

Osmotic pressure

Freezing point

Sublimation temperature

A solution can be

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Dilute and concentrated

Saturated and dilute

Saturated and unsaturated

Supersaturated and saturated

In an exothermic reaction

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Enthalpy of reactants is lesser than that of products

Enthalpy of reactants is greater than that of products

Heat is transferred form surrounding into the system

Enthalpy of reactants and products same

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Reversible reaction

Irreversible reaction

Spontaneous reaction

None of these

The nature of positive ray depend on:

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The nature of electrode.

The nature of discharge tube.

The nature of residual gas.

All of above.

A smuggler could not carry gold by chemically depositing iron on the gold surface since

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Gold is denser

Iron rusts

Gold has higher reduction potential then iron

Gold has lower reduction potential then iron

Lead accumulator contains

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30% NaCI solution as electrolyte

30% HCI solution as electrolyte

30% H₂SO₄solution as electrolyte

30% NaOH solution as electrolyte

Mottling of teeth is due to presence of an element in drinking water

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Mercury

Fluorine

Boron

Chlorine

Benzene reacts with ozone and gives

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Glycerin

Glyoxal

Maleic anhydride

Benzoic acid

Hybridization in alkanes is:

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sp

sp²

sp³

dsp²

The formula of ketone is

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None of these

Which statement in not correct about alcohol?

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Ethyl alcohol is heavier than water

Ethyl alcohol ecaporates more quickly

Alcohol with less number of carbon atoms is more soluble in water than alcohol with more number of carbons atoms

Alcohol produces H₂by reaction with sodium metal

Which of the following is an ortho-para directing group

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