Question # 1

A carbon atom carrying a postitive charge and attached to three other atoms of groups is called

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Caronium ion

Carbanion

Oconium ion

Carba ion

In passage of electricity through aqueous solution of AgNO₃silver dissolves at anode to form Ag⁺, the electrodes are

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Silver metal

Pt metal

Graphite

Copper metal

Optical activity is possible in

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Oxalic acid

Acetic acid

Tartaric acid

Formic acid

The art of electroplating was given by

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Faraday

Edison

Thomas Gradam

Brugan

All the following decompose easily on heating to give oxygen except

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Lead nitrate

Potassium chlorate

Mercuric oxide

Manganese dioxide

Identify the incorrect statement with respect to ozone

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Ozone is formed in the upper atmosphere by a photochemical reaction involving dioxygen

Ozone is more reactive than diaoxygen

Ozone is diamagnetic whereas dioxygen is paramagnetic

Ozone protects the earth's inhabitants by absorbing gamma-radiations

In Tolten's best, the end product is ______ formed

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White ppts

Red ppts

Yellow ppts

Silver mirror

Which one of the following has continuous solubility curve

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NH₄NO₃

CaCI

CaCI₂. 6H₂O

Na₂SO₄. 10H₂O

The organic compounds containing Ph-OH group are called:

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Phenol

aldehyde

Keton

Carboxylic acids

P₂O₅is heated with water to give

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Hypophosphorus acid

Phosphorus acid

Hypophosphorus acid

Orthophosphorus acid

The polymers which can not be re-softened again and again are called

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Thermoplastic

Thermosetting

Both a and b

None

Which salt is used for preserving food

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BaCl₂

CaCl₂

NaCl

Na₂SO₄

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Moles^-2dm⁺⁶

No units

Mole dm^-3

Mole^-1dm^-3

Which of the following is a polar molecules

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Carbon dioxide

Carbon tetrachloride

Methanol

Ethane

In a Galvanic cell

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Chemical energy is converted into electricity

Chemical energy is converted into heat

Electrical energy is converted into heat

Electrical energy is converted into chemical energy

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

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Formic acid

Acetic acid

Benzoic acid

Butanoic acid

The charge of an electron is determined by

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J.J. Thomson

Crooks

Perrin

R.A.Millikan

Cellulose does:

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Satisfy human appetite

Stimulates intestinal peristalsis

Gives fibre and bulk to the food

All of these

Which of the following correctly describes the process occurring at the electrodes when molten NaCl is electrolyzed:

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No reaction at anode, reduction at cathode.

No reaction at cathode, oxidation at anode.

Oxidation at anodes, reduction at cathode.

Oxidation at cathode, reduction at anode.

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

A pair of elements in the same family in the periodic classification is

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Cl and C

Ca and Al

N and Ne

Na and K

The test used for the detection of ethanol in the mouth of a drunk driver is that the drunk driver is asked to blow air from mouth into a solution of K₂Cr₂O₇and H₂SO₄. The colour changes, if the driver is drunk

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From orange to green

From pink to green

From orange to colorless

From pink to colorless

Amiino acids are building blocks of:

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Protein

Carbohydrates

Lipids

Fats

The functional group isomer of dimethylether is

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Ethyl alcohol

Propyl alcohol

Diethyl ether

Butyl alcohol

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The value of K_pfalls with a rise in temperature

The value of K_pfalls with increasing pressure

Adding V₂O₅catalyst increase the equilibrium yield of sulphur trioxide equilibrium yield of sulphur trioxide

The value of K_pis equal to K_c

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Elimination Esterification

Elimination Isomerisation

Oxidation Exterification

Oxidation Oxidation

When ammonia is heated with cupric oxide, a molecule of ammonia will

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Gain 3 electrons

Lose 3 electrons

Gain 2 electrons

Lose 2 electrons

Drawback DDT as presticide is

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I becomes ineffective after some time

It is less effective than others

It is not easily/rapidly degraded in nature

Its high cost

Which of the following acid can be used as a catalyst in Friedal Craft's reactions

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AlCl₃

HNO₃

BeCl₂

NaCl

Chromatography is derived from Greek word 'Khromatos' means:

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Type writting

Printing

Color writing

Writing

Aromatic carboxylic acids have carboxyl group attached to group :

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Alkyl group

Aryl group

Phenyl group

Benzyl group

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