Question # 1

Gooch crucible is used for the filtration of precipitates having

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High Solubility

High concentration

High ignition temperature

Low Temperature

Ammonia gas used directly as a fertilizer is injected into the soil at a depth of about

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Two inches

Three inches

Five inches

Six inches

The number of atoms contained in 11.2 L of SO₂at S.T.P are

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3/2 x 6.02 x 10²³

2 x 6.02 x 10²³

6.02 x 10²³

4 x 6.02 x 10²³

The heat evolved in combustion of rhombic and monoclinic sulphur are -70960 and -71030 cal mol^-1respectively. What will be heat of conversion of rhombic sulphur to monoclinic?

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70960 calories

71030 calories

-70 calories

+70 calories

Oleum is

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Castor oil

Oil of vitriol

Fuming of H₂SO₄

None of them

Which of the following reaction is used for detecting presence of carbonyl group?

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Reaction with hydroxylamine

Reaction with hydrazine

Reaction with phenyl hydrazine

All

Which of the following statement regarding catalyst is not true?

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A catalyst remains unchanged in composition and quantity at the end of the reaction

A catalyst can initiate a reaction

A catalyst dose not alter the equilibrium in a reversible reaction

Catalysts are sometimes very specific in respect of reaction.

The carbon atoms in calcium carbide are held by

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Ionic bonds

Sigma bonds

2 covalent, one co-ordinate bond

2π and oneα bond

Which of the following units represents largest amount of energy?

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Calorie

Joule

Erg

Electron vol.

The disaccharide present in milk is

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Sucrose

Maltose

Lactose

Cellobiose

Which of the following as a molecular diseaes?

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Allergy

Cancer

German measles

Sickle cell anemia

Chief air pollutant which is likely to deplete ozone layer

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Suphure dioxide

Carbon dioxide

Nitrogen oxides and chloro flrorocarbons

A solution of sodium sulphate was electrolysed using some inert electrodes. The products at the electrodes are

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O_2,H₂

O_2,Na

O_2,SO₂

O_2,S_2O^2-₈

A cell constant is generally found by measuring the conductivity of aqueous solution of

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BaCl₂

KCl

NaCl

MgCl₂

ΔH_{neutralisation}is always

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positive

Negative

Zero

Positive or negative

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

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Bonding begaviour

Electronegativity

Ionisation potential

Neutron/proton ratio

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