Question # 1

The organic compounds containing Ph--OH group are called:

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Phenol

Aldehyde

Ketones

Carboxylic acids

Cl₂reacts with CS₂in presence of AlCl₃to form

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CHCl₃

CCl₄

C₂H₅Cl

C₂H₆

A homogeneous mixture of two or more than two chemical substances is called

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Solute

Solution

Solvent

Salvation

The solubility product of AgCl is 2.0 x 10^-3 mol² dm^-6 , The maximum concentration of Ag ion in the solution is :

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2.0 x 10^-10 mol dm^-3

1.41 x 10^-10 mol dm^-3

1.0x 10^-10 mol dm^-3

4.0x 10^-10 mol dm^-3

The attraction that an atom exerts on a pair of electrons that are being shared with another atom for forming covalent bond is referred to as its

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Electron affinity

Electronegativity

Ionisation energy

Valency

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.

Diethyl ether is obtained by Williamsons synthesis using

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Ethanol + Na + C₂H₅Br

Ethanol + Mg + C₂H₅Br

Methanol + Na + CH₃Br

Methanol + Mg + CH₃Br

Bell metal is an alloy of Sn and

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Copper

Iron

Zinc

Magnesium

CFCs undergo homolytic fission by uv light in the stratosphere which radical could result from this irradiations of CHCICF₂Cl.

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CHF Cl C FCl

CH Cl CF₂Cl

CHF CF₂Cl

C FCl CF₂Cl

Series starting from57La,42Hf -80Hg is in the period:

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4th

5th

6th

7th

Enzymes are catalysts which contain other than carbon and hydrogen one other element

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Oxygen

Sulphur

Phosphorus

Iodine

The difference of potential of two electrodes when concentration of solution is 1M each at 25°C and1 atm is called :

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Cell reaction.

Electrode potential.

Cell voltage.

Standard cell potential.

Which of the following reagents is used to distinguish acetone and acetophenone

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NaHSO₃

Grinard reagent

Na₂SO₄

NH₄Cl

If carbon dioxide is bubbled through solution of Grignard's reagent in ether and the resultant product is reacted with hydrochloric acid, it gives

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An alkane

Al alcohol

A carboxylic acid

An aldehyde

In which reaction, aromatic aldehyde is treated with acid anhydride in the presence of corresponding salt of the acid to give unsaturated aromatic acid?

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Friedel-Crafts reaction

Perkin's reaction

Wurtz reaction

None of these

S-block elements consist of

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Alkali metals

Alkaline earth metals

Alkali and alkaline earth metals

None of these

Which of the following is a characteristic of a reversible reaction?

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It never proceeds to completion

It can be influenced by a catalyst

It proceeds only in the forward direction

Number of moles of reactants and products are equal

Which of the following oxides is unlikely to dissolve in aqueous hydroxide

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Al₂O₃

MgO

SO₂

SIO₂

Rearrangement of an oxime to an amide in the presence of strong acid is called

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Curtius rearrangement

Fries rearrangement

Beckman rearrangement

Aldol condensation

Acid rain is caused when various atmospheric gases dissolve in rain water. What are the gases that cause rain water

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SO₂

NO₂

CO

A and b only

The oxidation number of free element is always taken to be

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0

1

2

-1

General formula of alkyl halide is:

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R----X

R----OH

R------COH

R------COOH

The unit of rate of reaction is

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mole dm^-3

mole Kg^-1

moles dm^-3sec^-1

grams dm^-3

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Diastase

Lipase

Inverters

Zymase

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Zero

253 sec

150 sec

500 sec

Smallest particle of an element which may or may not have independent existence is known as:

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A molecule

An ion

An atom

An electron

Burning of fossil fuels is the main source of pollution

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Nitrogen oxide

Nitric oxide

Nitrous oxide

Sulphur dioxide

Sodium is never found free in nature because of its

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Chemical reactivity

Small ionic size

Small atomic volume

None of these

DDT is

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Biodegradable pollutant

Nondegradable pollutant

Not a pollutant

An antibiotic

Solubility of a substance in water decreases with rise in temperature except

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CaCI₂. 6H₂O

Pb(NO₃)₂

K₂Cr₂O₇

Ce₂(SO₄)₃

Which of the following synthetic fertilizer do not make soil acidic

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Urea

Thin urea

Ammonium phosphate

Potassium nitrate

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