Question # 1

Which can be purified by sublimation

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F2

Cl2

Be2

I2

Chlorine is used in

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Sterilizatin of water

Extractionof gold

Bleaching of cotton

All above

Of the following the commonly used n the laboratory desiccator is.

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Anhyd. Na2Co3

Anhyd Ca Cl2

Dry NaCl

None of the above

Which of the following is not an ore of iron.

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Haematite

Magnetite

Siderite

Monazite

When Phosphate rock Ca3(PO4) 2 is converted to phosphorus.

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One of the products of the reaction is water

Sulphuric acid is added to generate insoluble calcium sulphate

Hydrogen is used to reduce the phosphate to phosphorus

Silica is added to form a calcium silicate slag

Mangalium is an alloy of.

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Al + Mg

Mg + Ai + Mn

Mg + Ai + Cu

Mg + Ai + Cu + Mn

Which of the following metals form volatile carboyl with CO below 80^oC

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Cu

Fe

CO

Ni

The aluminium alloy used to make parts of aircrafts is.

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Magnalium

Aluminium bronze

Duralumin

All of the these

Which of the following species have undistributed octahedral structure.

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SF6

PF6

Si F₆^2-

XeF6

The movement of an electric charge produce a magnetic field is known from the

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Elementary Physics

Elementary Chemistry

Both A and B

None of above

Which of the following property is not related to aluminum.

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it is silvery white metal with brilliant lusture

It is a very light metal with specific gravity as 2.7

It is good conductor of heat

It is the least reactive element of III Group.

Which of the following bonds between carbon -carbon is teh strongest.

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Sigma bond

Pi bond

Double bond

Triple bond

Which of the halogens has lowest bond energy.

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Cl2

Br2

F2

I2

Which of the following is the most abundant alkaline earth metal.

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Be

Mg

Ca

Sr

Which of the following is not correct.

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Rusting of iron can be stopped by increasing the concentration of CO2 in water

Rusting of iron is electrochemical in nature.

Rusting of iron takes place in moist air

Rusting of iron produces hydrated iron (III) oxide

Used in Geiger counter to detect radioactivity

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He

Ne

Ar

Kr

Any substance which has solidified from the liquid state with crystallization is known as

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Steel

Fibre

Glass

Asbestos

H-Bond has more energy than the van der Waals forces i.e.

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1.0 kcal/mole

2.0 k cal/mole

10.0 kcal/mole

20. 0 kcal mole

The fluoride tooth paste contains

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SnF2 and Sn2P2O7

NaF

CaF2

None of these

The formula of Tetraboric acid is.

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H2BO3

HBO2

H2B4O7

H6B4O9

Hydrogen gas will not redue

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Heated cupric oxide

Headed ferric oxide

Heated stannic oxide

Heated aluminium oxide

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