Question # 1

In average composition of a good sample of cement the percentage of silica is.

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18.5%

20.5%

22.5%

24.5%

Which among the following hydride is ionic in nature.

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Ammonia

Protium oxide

Calcium hydride

Sulphane

Bromine is used as

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Fungicides

Herbicides

Germicides

Insecticides

Which of the following statement represent disadvantages of sanitary landfill

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Public opposition

Uneconomical

Health hazard

All above

The temperature of which the compound melts into a liquid to the same composition as the solid is called the

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Congruent melting point

Incongruent melting point

Peritectic temperatures

Metastable point

Which of the following statements is not true with respect to atomic spectroscopy.

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Atoms are simplest form of matter

Atoms cannot rotate or vibrate as molecules do

Only electronic transitions within atoms take place

Band spectra are observed

According to Arrhenius theory an acid is defined as substance which

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Accepts and electron pair

Donatees H+ ion in ammonia

Contains Cl- ions

Furnishes H3O + ion in water

The addition of Br2 to cis 2-butene produces.

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(+) 2,3 - dibromobutane only

(-) 2,3 -dibromobutane only

(+) 2,3, dibromobutane

meso-2,3, -dibromobutane

The correct order of electron affinities of SI, P, and Cl is.

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P > Si > Cl

Cl > P > Si

Cl > Si, > P

Si > P . Cl

Which of the following analytical technique is not concerned with atomic spectroscopy.

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Flame photometry

Flame emission spectrometry

Atomic absorption spectrometry

I-R spectrophotometry

Which of the following term refers to nearness between several measurements of the same quantity.

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Accuracy

Precision

Standard error

Standard error of mean

Which of the following is the correct order of interactions.

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Covalent < hydrogen bonding < Van Der Waal's < dipole -dipole

Van der Waal's < hydrogen bonding < dipole -dipole < covalent

Van der Waal's < dipole -dipole < hydrogen bonding < covalent

Dipole-dipole < Van der Waal's < hydrogen bonding < covalent

One of the best fluorinating agent is

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XeF2

XeF4

XeF6

None of above

Borax exist in the form

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Ordinary borax

Octahdral borax

Borax glass

All above

Ionic compounds in general possess both

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High melting point and non -directional bonds

High melting points and low boiling poinits

Directional bonds and low boiling points

High solubility in polar and non -polar bonds.

Boric acid is added to glass because is.

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Makes the glass opalescent

Reduces the coefficient of expansion

Makes the glass brittle

Increase refractive index of the glass.

In coordination chemistry the donor atom of a ligand is.

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A Lewis acid

The counter ion

The central metal atom

The atom in the legend that shares an electron pair with the metal

SO2 is generated from which of the following industry.

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Drying and packing

Paper

Pulp

paper and pulp

The number of bonds formed by the central atom is called its.

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Valence number

Complex number

Coordination number

Avogadro's number

According to the Grothus -Draper law

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Only absorbed light is effective in producing photo chemical changes

Only light between certain wavelengths

Light is effective only for photo chemical reactions is solution

The light absorbed in proportional to its intensity

Which of the following method is used for the coventrating of ores.

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Gravity separation

Magnetic concentration

Fourth floatation

Electrostatic concentration

All

When borax is strongly hented, it gives

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B2O4

Na2B4O7

NaBO2

NaBO2 + B2O3

Which of the following steps is not involved in chemical analysis.

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Separation of sample in pure form

Separation of the sample in the mixture form

Preparation of sample for the analyisis

Validity of experimental results

Ozone layer of upper atmosphere is being destroyed by

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chlorofluorocarbons

SO2

Photochemical oxidants O2 and CO2

Smog

The tyndall effect is not observed in

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Suspensions

Emulsions

Colloidal solutions

True solutions

During the last two centuries, the atmospheric CO2 contents are increased by

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15%

25%

35%

50%

Which of the following statement is not relat4ed wiht SO2

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It is a colourless gas

It has sharp and pungent odour

It is moderately soluble in water

It is reduced slowly in clear air to H2S

What refers to the tin mill steel, without a coating.

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White plate

Black plate

Tin steel free

Dichromate tin

It is known that AgCl is insoluble in HNO3 but dissolves readily in NH4OH solution .Which of the following statement is not correct.

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Ag ion reacts to form complex with NH4OH solution

The concentration of Ag ion decreases

Ionic product is less than the solubility product

Ionic product is greater than solubility product

Tetra halides do not undergo hydrolysis

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C

Si

Sn

Pb

Commercial or the phosphoric acid is pure.

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37.0%

82.98%

88.25%

90.12%

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