Question # 1

Hemimorphite is an example of.

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Orthosilicate

Pyrosilicate

Cyclic silicate

Meta silicate

The oxidation state of HCiO4

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+ 7

+ 3

+ 5

+ 1

Which of the following pairs does not represent Lowery acid base pair.

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H2O+NH3

H2O +H2O

HCL + H2O

CH3NH2 + BF3

Which of the following is not an ore of nickel.

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Pentalandite

Siderite

Garnierite

Nicollite

The hybridization of S in SO2 is.

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sp

sp2

sp3

dsp2

Which of the following is not true for metalloids.

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They are borderline elements

They usually act as electron during with non metals.

B, Si, and Ge

They are all solids at room temperature.

The second order rate constant can have units.

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dm-6 mol 2 s-1

dm3 mol s-1

dm³ mol^-1 s^-1

dm6 mol-1 s-1

Oxidation state of the chromium [Cr(NH3)6]3+ complex ion is

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+2

+3

+4

+5

Which of the following case of acid or base strength is not explained by inductive effect.

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Formic acid> acetic acid

Dimethyl amine > trimethyl amine

Dimethyl amine > methyl amine

Chloroacetic acid > acetic acid

1 meter = ___________ nm

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10⁹

10^-9

10¹⁰

10^-10

Which of the following pollutant is generated from combustion of fuel.

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Smoke

SO2

CO2

Metallic oxides

All above

When of the following steps is involved in structure determination of an organic compound.

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Purification of compund.

Qualitative and quantitative analysis of elements present

Determination of molar mass

All above steps

Usually the rate of the reactions is expressed as.

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mol dm-1

mol dm-3 s-1

mol dm-2 s-1

mol 2 dm-3 s-1

Pick out the incorrect statement

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The geometry around 'N' atom in trimethylamine is pyramidal

The geometry around N atom in trisilylamine is planar

The nitrogen atim is trimethylamine is sp2 hybridized whilst in trisilylamine it is sp2 hybridized

Trisilylamine has donor properties whilst trimethylamine has no donor properties.

Which of the following is NOT true 7 ceramic materials are.

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Hard, have high densities high compressive strength and very good thermal resistance and strength at higher temperature Silicon

Hard, have low densities high compressive strength and very good thermal resistance and strength at higher temperature.

Hard, have low densities low compressive strength and very good thermal resistance and strength at higher temperature.

Hard, have low densities' high compressive strength and very good thermal resistance and strength at higher temperature.

Helium is used in weather balloons and airships instead of H2 becuse it is.

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Lighter than hydrogen

Incombustible

More abundant than hydrogen

Radiactive

The process in which ore is heated generally in the presence of air, at temperature below their melting points is called.

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Calcination

Roasting

Fourth floatation

besemerization

The principle former of almost all glasses is

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(SIO2)n

(SiO3)n

(SiO2)

None of these

In statistical mechanics, there exists a function which contains all the information about a macroscopic system. This function is known as.

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Eigen function

Wave function

Partition function

Distribution function

Polyamide jinkage is present in

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Nylon

Silk

Protein

All of these

Setting of cement is improved by

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Lime stone

Clay

Gypsum

Water

The process requirieng the absorption of energy of.

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F = F

Cl = Cl

H = H

O = O

Which one of the following is not correct.

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Ar is used in electric bulbs

Kr is obtained during radioactive decay

Boiling point of H2 is lowest among all noble gases.

Xe forms Xe OF4

Which is the second most abundant element occurring the earth crust.

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Iron

Cu

Cr

Ni

Rotary spinning process is used to produce

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Glass wool

Optical fibre

Glass marble

None of above

Blue color of glass of due to the presence of .

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Cobalt (II)

Chromium (III)

Iron (III)

copper (II)

A terpenoid which has as alcoholic group in the molecule is.

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Citral

Camphor

Menthol

Carvone

The Hall process involves the reduction of Al2O3 to aluminium by

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Carbon

Carbon monoxide

Molecular hydrogen

Electrolysis

BCl3 is a planar molecule because B atom is.

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sp2 hybridized

Sp3 hybridized

sp hybridzed

sp3 d hybridized

Human hearing is sensitive to frequency in the range of about

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10,000 - 20,000 Hz

10 - 10,000 Hz

16- 20,000 Hz

None of the above

Drained sewage has B.O.D.

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More than that of water

Less than that of water

Equal to that of water

None of the above

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