Question # 1

The iron obtained from blast furnace is

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Pig iron

Wrought ion

Soft ion

Steel

Selection of filter paper depends upon sizes of particles to be:

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Tested

^Filtered

Checked

All of above

Which of the following is halo form

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CHBr₃

CHCI₃

CHI₃

All of these

Almost forward reaction is complete when value of k_{c :}

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Neither larger nor very small.

Very small.

Very large.

Negligible.

Transition elements form which type of bond

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Ionic bonds only

Covalent bonds only

Ionic and covalent bonds

Polar bonds

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

Grignard reagent is not prepared in aqueous medium but prepared in ether medium because

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The reagent is highly reactive in ether

The reagent does not react with water

The reagent becomes inactive in water

The reagent reacts with water

Which statement about Arrhenius equation is incorrect

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Factor 'A' called Arrhenius constant depends upon collision frequency of reactants

Rate of reaction increase by increasing temperature

Rate constant k is increased

Activation energy Ea is decreased by rise in temperature

A bond between two atoms may be obtained by sharing of electrons such a bond is called

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An ionic bond

A coordinate bond

A dative bond

A covalent bond

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

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32 g

3.2 g

5.6 g

9.6 g

Permonosulphuric acid is known as

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Marshall's acid

Carlo's acid

Sulphuric acid

None of these

For a given process, the heat changes at constant pressure (q_p) and at constant volume (q_v) are related to each other as

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q_p= q_v

q_p< q_v

q_p= qv/2

The voltaic or galvanic cells which cannot be recharged are called

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Primary cells

Secondary cells

Infinite cells

Fuel cells

Ethylene decolorizes cold dilute solution of KMnO₄. This test is known as

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Colouration test

Baeyer's test

Silver mirror test

Ring test

What happens when isotonic solution of A (mol.wt.342) and B (mol.wt 60) are put in to communication through semipermeable membrane?

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Transference of solvent from solution A to that of B take place

Transference of solvent from solution B to that of A takes place

No transference of solvent from solution A to that of B takes place

Change in temperature of solutions takes place

From which of the following tertiary butyl alcohol is obtained by the action of methyl magnesium iodide?

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HCHO

CH₃CHO

CH₃COCH₃

CO₂

Ecology is a science of environment and deals specially with

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Stratosphere

Biosphere

Lithosphere

Hydrosphere

Which of the following does not reflect the periodicity of elements?

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Bonding behaviour

Electronegativity

Ionisation potential

Neutral/proton ratio

On heating glycerol with conc. Sulphuric acid a compound with unpleasant odour is obtained. The compound is

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Methyl alcohol

Formic acid

Prop-2-enal

Glycerol sulphate

Peptide bond is a key feature in

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Polysaccharide

Proteins

Nucleotide

Vitamins

What is chrome yellow?

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Pbo

Pb₂O

PbCrO₄

Pb₃O₄

Aldelydes are the oxidation product of

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P-alcohols

s-alcohols

ter-alcohols

carboxylic acids

The elements with atomic numbers 9, 17, 35, 53, 85 an all

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Noble gases

Halogens

Heavy metals

Light metals

The oxides of which of the following elements will be acidic in character

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Mg

Rb

Li

Cl

If a salt bridge is removed between the two half cells, the voltage

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Drops to zero

Does not change

Increases gradually

Increases rapidly

In molecules kinetic and potential energies are:

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Definite

Moderate

Indefinite

None of above

Which one of the following statements is not correct

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A molecule is the smallest particle of an element which can exist independently

He is a molecule of helium

S₈is a molecule of sulphur

O₃is a molecule of oxygen

All C - H bond lengths of benzene ring is

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1.07A°

1.09A°

1.08A°

None

Which of the following fibres are made of polyamides?

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Dacron

Orlon

Nylon

Rayon

A solution containing 5.8 grams acetone (CH₃OCH₃), 4.6 gram ethyl alcohol (C₂H₅OH) and 12 grams chloroform (CHl₃) has mole fraction and mole percent of acetone

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0.11, 10%

0.33, 33%

0.22, 22%

0.11, 33%

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