Question # 1

Allotropic form of tin

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White tin

Grey tin

Rhomic tin

All above

Which of the following techniques is used to separate a mixture of cations.

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GC

FPLC

Ion exchange chromatography

Size exchange chromatography

How many unpaired electron are there in a strong field iron (II) octahederal compled.

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0

1

2

4

Which of the following symmetry element leaves the molecule or an object unchanged.

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Proper rotation

Improper rotation

Inversion axis

Identity

Which of the following is not an ore of iron.

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Haematite

Magnetite

Siderite

Monazite

In the forth floatation process for the purification of ores, the ore particles float because.

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They are light

Their surface is not easily vetted by water

They bear electrostatic charge

They are insoluble

The migration of positively charged colloidal particles, under an electrical field , towards the cathode is called.

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Cataphoresis

Electroamosis

Sedimentation

Electrodialysis

Bromine is used as

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Fungicides

Herbicides

Germicides

Insecticides

What group of steels are molybdenum high sped steels.

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Group A

Group D

Group M

Group H

For which of the following compounds is the rate of hydrolysis by aqueous alkali most likely to be independent of the hydroxide ion concentration.

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1-Chlorobutane

2- Bromobutane

1- Iodobutane

2- Bromo -2- methyl butane

A combination of atomic orbitals produces a large number of closely special energy states brown as.

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Packet of energy

Band of energy

Botha a and b

None of the above

Manganese steel usually contains how many percent of manganese.

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1 to 5

3 to 10

11 to 14

14 to 18

Enzymatic action is heat at a fixed

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Temparature

pH

Both of these

None of these

Which of the following will be most effective int he coagulntion of

Fe (OH)3 sol.

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NaCl

MgSO4

AlCl3

Mg3 (PO4)2

Which of the ionic possesses highest bond energy.

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C-C

Si -Si

Ge - Ge

Sn -Sn

Two solids A and B have appreciable different solubility in water but their m.p. are very close. The mixture A and B can be separated by.

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Sublimation

Distillation

Fractional crystallization

Specific rotation

The correct order of acid strength is.

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HIO4 > HBrO4 > HCIO4

HCIO4> HBrO4 > HIO4

HBrO4 > HIO4 > HCIO4

HBrO4 > HCIO4 > HIO4

The criteria for aromatically is presence of

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Uneaturations

Cyclic structure

Presence of 4nx electrons

Presence of 4n + 2n electrons

Beside the common silica based SPE particles, polymer supports are also available They have advantages over silica based SPE particles, Which of the following reason is possible.

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These are stable over a wide pH range.

These do not possesses residual silica groups

These are designed to be wettable and have high capacity than silica base particles.

All above

Which isotope of hydrogen is radioactive in nature.

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Protium and deuterium

Tritium only

Tritium and deuterium

Only deuterium

The number 7.43 is rounded to

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7,44

7.4

7.45

7.3

The oxidation number of Mn in KMnO4

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+5

+7

+4

+3

Which of the following pollutant results from combustion of fossil fuels.

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SO2

NO2

CO

All above

Low quality steels with an M. Suffix on the designation intended for non structural application is classified as.

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Merchant quality

Commercial quality

Drawing quality

Low quality

An explosive

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Nitroglycerine

Trinitrotoluene

Fluorine perchlorate

All above

The elements with highest electron affinity belongs to.

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Period 2 , group 17

Period 3, group 17

Period 2, group 18

Period, 2 , group 1

Acid rain is caused due to increase in the concentration of _______ in the atmosphere

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Ozone and dust

CO2 and CO

SO3 and CO

SO2 and NO2

Temporary hard water is softened on industrial scale by adding.

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Mg(OH)2

Ca(OH)2

KOH

NaOH

Which of the following species is not a basic radical.

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Ag+

Cl-

Ba2+

K+

Any property whose magnitude is independent of the amount of substance present is called a/an

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Extensive property

Colligative property

Structural propety

Intensive property

Formula of orthophosphoric acid.

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H2PO4

H3PO3

H3PO2

H4P2O5

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