Question # 1

The symbol of the element whose atoms have the outer most electronic configuration 2s² 2p³ is

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N

Li

P

Na

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

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HCI + anhyd. ZnCI₂

NaCI

PCI₅

SOCI₂

Acetic anhydride is obtained form acetyl chloride by the reaction of

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P₂O₅

H₂SO₄

CH₃COONa

CH₃COCH₃

ΔH_{Neutralisation} is always

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Positive

Negative

Zero

Positive or negative

Reaction of ethylamine with chloroform in alcoholic KOH producers

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CH₃OH

CH₃NC

C₂H₅NC

C₂H₅CN

The relative rate of diffusion of a gas (molecular wright - 128) as compared to oxygen is

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2 times

1/4

1/8

1/2

For the carbylamine reaction we need hot alc.KOH and

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Any amin and chloroform

Chloroform and Ag powder

A primary amine and chloroform

A mono alkyl amine and trichlorom-ethane

When electrons revolve is stationary orbits

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There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

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

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

When quantity of electricity passed is one faraday then the mass deposited at the electrode is equal to

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One gm. atomic weight

One gm. Equivalent weight

Electrochemical equivalent

None of the above

The vapour density of a gas is 11.2. The volume occupied by 11.2 g of this gas at N.T.P. is

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22.4 litres

11.2 litres

1 litre

2.24 litres

Which of the following value ofΔHf represent that product is least stable?

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-94.0 kcal mol^-1

-231.6 kcal mol^-1

+21.4 kcal mol^-1

+64.8 kcal mol^-1

Aldehydes are produce in atmosphere by

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Oxidation of secondary alcohols

Reduction of alkenes

Reaction of oxygen atoms with hydrocarbons

Reaction of oxygen atoms with ozone.

The last orbit of argon would have electrons

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8

18

2

6

Which has largest first ionization energy?

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Li

Na

K

Rb

Which one is the property of an ideal solvent?

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Should be expensive

It should react chemically with the solute

Impurities should crystallize along with the solute

Should be safe to use

The principal constituent of pyrex glass

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Zn

B

Pb

Cl

Dilute hydrochloric acid solution cannot be concentrated by boiling beyond

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11%

33%

44%

22%

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

The alkali metal which is liquid at 15°C is

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K

Cs

Na

None

Bragg's law is given by equation

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nλ= 2θsinθ

nλ= 2 d sinθ

2 nλ= d sinθ

nλ= 1/2 d sinθ

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