Question # 1

The following has zero valency

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Na

Be

Al

Kr

The number of electrons in the M shell of the element with atomic number 24 is

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24

12

13

8

In a crystal a≠b≠c, a =γ= 90° andβ≠90°. It is

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Monoclinic

Rhombic

Trigonal

Tetragonal

Aluminothermy used for on the spot welding of large iron structure is based upon the fact that

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As compared to iron, aluminium has greater affinity for oxygen

As compared to aluminium, iron has greater affinity for oxygen

Refraction between aluminium and oxygen is endothermic

Reaction between iron and oxygen is endothermic.

Dolomite has the composition

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KCL.MgCL₂.6H₂O

Na₃AIF₆

CaCO₃.MgCO₃

CaCL₂.MgCl_2.6H₂O

Pollutant of automobile exhausts that affects nervous system/produces mental diseases is

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Mercury

Lead

Nitrogen oxide

Sulphur oxide

Which one is not usually used for the crystallization?

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Acetone

Acetic acid

Sulphuric acid

Chloroform

If a salt bridge is removed electrode is made from which of the following?

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ZnCl₂

CuSO₄

Hg₂Cl₂

HgCl₂

When electrons revolve in stationary orbits,

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There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

Which one of the following compounds does not exist?

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NCl₅

AsF₅

SbCl₅

PF₅

The spectrum of helium is expected to be similar to that of

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H

Li⁺

Na

He⁺

Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBh₄or LiAH₄?

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1-Propanol

2-Propanol

2-Methyl2-Proponal

Ethanol.

Fertililzer are made by

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Nature only

Artificial methods only

Both artificial and natural methods

None of the above

The molal elevation constant is the ratio of the elevation in boiling point to

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Mojarity

Molality

Mole fraction of solute

Mole fraction of solvent

Which of the following metal exhibits more than one oxidation?

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Na

Mg

Fe

Al

Cannizzaro reaction is not given by

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Trimethyl acetaldehyde

Acetaldehyde

Benzaldehyde

Formaldehyde.

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