Question # 1

Which one of the following sets of elements has the strongest tendency to form negative ions in gaseous state.

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NA, Mg, Al

Ca, V, Cr

N , O, F

Ga, ln, tI

The noble gases which does not I do not form any clathrates is.

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He

Ne

Argpm

Both He and Ne

SO3 exists in form

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a -so3

b-SO3

gama SO3

All above

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

Is a chain silicate

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Olivine

Tremolite

Beryl

Zeolite

Excluding H-atom , Hydrogen bond never involves more than atoms.

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One

Two

Three

Four

Which are not considered member of d-block elements.

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Zn

Cd

Hg

All above

The hybridization of sulphur in sulphur dioxide is.

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sp

sp2

sp3

dsp2

Elements in which differentiating electron enters the (n-1) the d-orbitals of the (n-1) the main shell are called elements.

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s- block

p-block

d-block

f-block

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

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As compared to iron, aluminium has greatest affinity for oxygen.

As compared to aluminium, iron has greater affinity for oxygen

Reaction between aluminim and oxygen endothermic

Reaction between iron and oxygen is endothermic

Which of the following alloys contains Cu and Zn

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Bronze

Brass

Gun metal

Type metal

Aluminium reacts with boiling water to liberatedi hydrogen gas along with the formation of.

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Aluminium oxide

Aluminium hydroxide

Aluminium suboxide

Aluminium superoxide

The wire of flash bulb is made up of.

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Cu

Ag

Mg

Ba

Which of the following compounds combines with hemoglobin.

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CO2

CO

NO

N2

Which metal burns in air at high temperature with the evolution of much heat.

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Cu

Hg

Pb

Al

White Phosphorus is kept under

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Cold water

Ammonia liquor

Ethanol

Kerosene

Hydrogen bond is not electrostatic in nature is stated by

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Electrostatic approach

Valence bond approach

Molecular orbital approach

None of the abvoe

Pick out the incorrect statement for SO2

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It turns filter paper moistened with acidified K2Cr2O7

It turns starch iodate paper blue

It does not react with chlorine in presence of charcoal

It decolourises acidified KMnO4 solution.

The halide which is inert to water is

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PCl5

SiCl4

BCl3

SF3

The important condition for the formation of chemical bond is that.

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Their electron clouds should not diffuse

Both atoms should have high electron affinites.

Both atoms should have same electronegativities

The process should be accompanied by the lowering in potential energy.

When 0.01 moles of NaOH are added to a buffer solution, its pH changes from 4.745 to 4.832 WHAT IS ITS.

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0.115

0.900

0.015

0.215

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