Question # 1

Dilute hydrochloric acid solution cannot be concentrated by boiling beyond

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11%

33%

44%

22%

Formic acid is obtained when

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Calcium acetate is heated with conc.H₂SO₄

Calcium formate is heated with calcium acetate

Glycerol is heated with oxalic acid

Acetaldehyde is oxidized with K₂CrO₇and H₂SO₄

Which has largest first ionization energy?

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Li

Na

K

Rb

Sodium thiosulfate is used in photography because of its

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Oxidizing behaviour

Reducing behaviour

Complexing behaviour

Photochemical behaviour

The main structure features of proteins is

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An ester linkage

An ether linkage

The peptide linkage

All

The heats evolved in combustion of rhombic and monoclinic sulphur are - 70960 and -71030 cal mol^-1 respectively what will be heat of conversion of rhombic sulphur ti monoclinic?

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70960 calories

71030 calories

-70 calories

+70 calories

AI is more reactive than Fe but AI is less easily corroded than Fe Because

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It is a noble metal

Oxygen forms a protective reaction easily with water

Iron undergoes reaction easily with water

Fe form mono and divalent ions.

Bragg's law is given by equation

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n λ = 2 θ sin θ

n λ = 2 d sin θ

2nλ = d sin θ

nλ = 1/2 d sin θ

Which of the following reagent cannot be used for preparing alkyl chloride from alcohol?

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HCI + anhyd. ZnCI₂

NaCI

PCI₅

SOCI₂

Which one of the following compounds does not exist?

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NCI₅

AsF₅

SbCI₅

PF₅

SO₂ and NO₂ pollution by increasing

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Alkalinity

Acidity

Neutrality

Buffer action

Bond angle is minimum for

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H₂O

H₂S

H₂Se

H₂Te

Ethyl chloride on treatment with aqueous alkali gives

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Ethane

Ethene

Ethanal

Ethanol

Mild oxidation of glycerol with H₂O₂/FeSO_{4 gives}

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Glyceraldehyde

Dihydroxy acetone

Glycerose

None

The order of reactivity of halogens in aliphatic substitution reactions is

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Br2 > C12 > F2

Cl2 > Br2 > F2

Cl2 C12 > Br2

F2 > Br2 > C12

When sulphur is boiled with Na₂SO₃solution, the compound formed is

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sodium sulphides

Sodiums sulphates

Sodium persulphate

Sodium thiosulphate

The formula of nitre is

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KNO₃

NANO₂

NaCl

Na₂CO₃

Which of the following has no tin in its composition?

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Solder

Bronze

Brass

Tin stone

Hypo is used to photography for

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Developing picture

Picture printed

The colour of picture

The fixation of picture

The most reactive compound for electrophilic nitration will be

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Benzyl chloride

Benzoic acid

Nitrobenzene

Chlorobenzene

For preparing an alkane, a concentrated aqueous solution of sodium or potassium salt of saturated carboxylic acid is subjected to

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Hydrolysis

Oxidation

Hydrogenation

Electrolysis

The spectrum of helium is expected to be similar to that of

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H

Li⁺

Na

He⁺

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