Question # 1

SN₂reaction has order of reaction :

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First

Second

Third

Zero

Violet colour is obtained when dilute CuSO₄is added in alkaline solution of protein. This test is known as

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Biuret

Xanthoproteic test

Hopkins-cole

All of these

The elements of group lA are called

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Chalocogens

Halogens

Alkali metals

Alkaline earth metals

Which has soapy touch?

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Na2B4O7

H3BO3

Ca2B6O11

HBO2

Which of the following reagents is used to distinguish between methanoic acid and ethanoic acid?

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Amm. silver nitrate solution

Neutral ferric chloride

Sodium hydroxide solution

Sodium carbonate solution

During oxidation in k₂Cr₂O_{7, Cr VI changes to :}

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I

II

III

IV

The apex angle of the folded filter paper is slightly greater than :

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60°

30°

45°

90°

Phenol is more readily soluble in

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Dil. HCl

Both NaOH and HCl

NaOH sol

Sodium bicarbonate solution

3-d series elements are present in:

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First period

Second Period

Third period

4th period

The function of salt bridge in the galvanic or voltaic cell is to

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Carry out oxidation at anode

To carry out reduction at cathode

Carry out electrolysis

To prevent the net charge accumulation in either of the half cells

Esters have peculiar smell, which of the following is used as an essence of orange

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Isoamyl acetate

Iosamyl valerate

Octyl acetate

Methyl butyrate

Solvent extraction method is a particularly useful technique of separation when the product to be separated is:

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non-volatile or thermally unstable.

volatile or thermally stable.

non-volatile or thermally stable.

volatile or thermally unstable.

Subsidiary quantum number specifies

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size of orbital

shape of orbital

orientations of orbitals

Nuclear stability

Electrolytes in the form of solution or in the fused state have the ability to conduct :

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Light.

Electricity.

Ions.

Electrons.

The chemical formula of gypsum is

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CaSO₄. 5H₂O

CaSO₄. 4H₂O

CaSO₄. 2H₂O

None of these

Which of the following are thermoplastic materials

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PVC

Polystyrenes

Polyethylene

All these

The substance which contains the water of crystallization is called

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Hydrated

Solvated

Crystal

None

Group VI-B of transition elements contains:

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Zn, Cd, Hg

Fe ,Ru ,Os

Cr, Mo ,W

Mn, Te, Re

2SO₂ + O₂ ⇌ 2SO₂H= 188KJ mole^-1

Which statement about following equilibrium is correct :

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The value ofK_pfalls with arise in temperature.

The value ofK_pis equal tok_c.

The value ofK_pfalls with the increase pressure.

Adding V₂O₅ catalyst increase the equilibrium yield of Sulphur trioxide.

Fluorine molecule is formed by

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The axial p-p overlap

The sidewise p-p overlap

The axial s-p overlap

The overlap of two sp²hybrid orbitals

The order of reactivity of halogens in aliphatic substitution reactions is

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Br2 > C12 > F2

C12 > Br2 > F2

C12 C12 > Br2

F2 > Br2 > C12

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

3.01 x 10²²Ag⁺ions is present in

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85 grams AgNO₃

0.85 g AgNO₃

8.5 g AgNO₃

18.5 g AgNO₃

When benzene is burnt in free supply of air, it is completely oxidized to

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CO

CO₂₊H₂O

H₂CO₃

None

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

What is chrome yellow?

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Pbo

Pb₂O

PbCrO₄

Pb₃O₄

A six membered ring containing one double bond called

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Cyclohexene

Cyclohexane

Cyclohexadiene

None

The elements in which d or f-orbitals are incomplete are called

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Transition elements

Typical elements

Actinides

lanthanides

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Three times

Six times

Nine times

Two times

Which of the following compounds on oxidation gives benzoic acid?

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Chlorophenol

Chlorotoluene

Chlorobenzene

Benzyl chloride

Major component of natural gas is:

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Ethane

Ethene

Propane

Methane

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