Question # 1

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

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BaCI₂

KCI

NaCI

MgCI₂

The relative rates of diffusion of a gas (Mol, wt. - 98) as compared to hydrogen will be

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1/7

1/5

1/4

1

Which species represents the electrophile in aromatic nitrotaion?

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NO^-₂

+

NO₂

NO2

NO^-₃

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

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

Covalent compounds are soluble in

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Polar solvents

Non-polar solvents

Concentrated acids

All solvents

Which one of the following has the lowest boiling point?

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B

AI

Ga

Ti

Heating a micture of sodium benzoate and soda lime gives

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Benzene

Methane

Sodium benzoate

Calcium benzoate

The effect of increasing the pressure on the following equilibrium 2A + 3B | | 3A + 2B is

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Forward reaction is favoured

Backward reaction is favoured

No effect

None of the above

With increasing principle quantum number the energy difference between adjacent energy levels in H atom

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Decreases

Increases

Remains constant

Decreases for low value of Z and increases for higher value of Z.

According to MO Theory the species O⁺₂ possesses

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Bond order of 2.5

Three unpaired electrons

Diamagnetic character

Stability lower then O₂

The rotation of two carbon atoms joined by double bond would happened only if

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P_ibond is broken

Sigma bond is broken

Both bonds are broken

None of above

Which of the following alkali metal hydroxides is the strongest base?

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LiOH

NaOH

KOH

CsOH

Outermost shells of two elements X and Y have two and six electrons respectively. If they combine, the expected formula of compound will be

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XY

X₂Y

X₂Y₃

XY₂

Each of following is true of white and red phosphours except that they

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Are both soluble in CS₂

Can be oxidized by heating in air

Consist of the same kind of atoms

Can be converted into one another

Which of the following represents elements in order of increasing atomic size?

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I, Br, Cl

Na, Mg, C

C, N, O

Li, Na, K

Which of the following fluorides of xenon is impossible?

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XeF₂

XeF₃

XeF₄

XeF₆

Which of the following with aqueous KOH will give acetaldehyde?

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1, 2-Dichloroethane

1, 1-Dichloroethane

Chloroacetic acid

Ethyl chloride

Water (H_2O) is liquid while hydrogen sulphide (H₂S) is a gas because

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Water has higher molecular weight

Hydrogen sulphide is a weak acid

Sulphure has high electronegativity than oxygen

Water molecules associate through hydrogen

Iron, once dipped in concentrated H₂SO₄, does not displace copper from copper sulphates solution, because

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It is less reactive than copper

A layer of sulphates is deposited on it

An inert layer of iron oxide is deposited on it.

All valence electrons of iron are consumed.

Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBH₄or LiAIH₄?

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1-Propanol

2-Propanol

2-Methyl-2-propanol

Ethanol

Reaction of ethylamine with chloroform in alcoholic KOH produces

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CH₃OH

CH₃NC

C₂H₅NC

C₂H₅CN

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