Question # 1

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

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Sigma bond

Pi bond

Double bond

Triple bond

Used in Geiger counter to detect radioactivity

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He

Ne

Ar

Kr

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 elements does not impart any characteristic colour to the flame.

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Ca

Mg

Ba

Sr

Glass electrode cannot be used to measure the pH of pure.

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Acetic acid

Ethyl alcohol

Gelatin

All above

A trend which is common to elements of both the group IA and group VII A ongoing from top to bottom.

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Boiling point increases

Electron affinity increases

Oxidizing power increases

Ionization energy decrease

Lead pencil contain

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Lead

Lead sulphide

a mixture of lead and silica

graphite

Chromium is found in nature in the the form of.

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Oxides

Silicates

Borates

Sulphides

An element with high electronegativity has

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High IE and high EA

High IE and low EA

Low IE and High EA

Low IE and low EA

Which of the following is an example of super octet molecules.

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C1F3

IF7

PCl5

All the three

The most important conditions for the formation of ionic bond are.

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High ionization energy of the metallic atom and high electron affinity of the non metallic atom.

Low ionization of the metallic atom and low electron affinity of the non metallic atom.

Low ionization energy of metallic atom and high electron affinity of the non metallic atom

High ionization energy of the metallic atom and high electron affinity of non metallic atom.

The structure of SO2 is

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Linear

Angular

V-shaped

Planner

Pick out the incorrect statement

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The geometry around 'N' atom in trimethylamine is pyramidal

The geometry around N atom in trisilylamine is planar

The nitrogen atim is trimethylamine is sp2 hybridized whilst in trisilylamine it is sp2 hybridized

Trisilylamine has donor properties whilst trimethylamine has no donor properties.

Elements in the same vertical group of the periodical have same

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Number of electron

Atomic number

Number of valence elections

Electronic configuration

In which of the following species the bonds are non directional.

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NCl3

RbCl

BeCl2

BCl3

Which of the following statement is not true for carbon.

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Its forms compounds with multiple bonds

Its ionization energy is very high

It undergoes catanation

It shows inert pair effect

AlCl3 fumes in air because of.

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Hydrolysis

Dehydration

Hydration

Oxidation

Which one of the following has the highest boiling point.

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H2O

H2S

H2Se

H2Te

Artificial nitrogen fixation may occur by the formation of.

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Nitric acid

Ammonia

Nitrides

Any of above

The ionization potential of K would be numerically equal to.

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Electron affinity of Ar

Electromagnetically of K

Electron affinity of K+

ionization energy of Ca

The basic strength of hydrides of group 15 elements very in the following order.

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NH3 > PH3 > AsH3 > SbH3 >BiH3

PH3 > NH3 > AsH3> SbH3 > BiH3

BiH3> NH3 >PH3 > AsH3 > SbH3

NH3 > PH3 > SbH3 > AsH3 > BiH3

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