Question # 1

Four elements A, B,C,D have atomic numbers Z , 1 ,Z, Z +1 and Z +2 Respectively If Z is 9, then bond between which pair of elements will be ionic.

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A and C

D and C

D and B

B and C

Lother Meyer plotted a graph showing variation of.

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Atomic volume with increase in atomic number

Atomic volume with increase in atomic weight

Atomic redii with increase in atomic weight.

Atomic weight which increase in atomic number

The bromine produced on commercial scale may contain impurities of.

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Water

Chloride

iodine

All above

Which of the following species has highest bond energy.

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H2

T2

D

Cl

In the electronic structure of acetic acid,the total number of shared and unshaped pair of electrons are respectively.

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16 ,8

8 ,4

12 ,8

8 ,12

Inert pair effect is best shown by

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Si

Z

Sn

Pb

Which among the following is least soluble in water.

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NaF

LiF

KF

CsF

Arrange the hydrides of group 15 in the correct order of reducing nature.

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NH3 < PH3 < AsH3 < Sb H3 < BiH3

NH3 > PH3 >AsH3 >Sb H3 > BiH3

PH3 < AsH3 < SbH3 < BiH3 < NH3

PH3 > AsH3 > SbH3 > BiH3 > NH3

Which group contains elements that exist as monoatomic molecules.

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1

2

14

18

Sulphate ores of aluminium

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Alumite

Cryolite

Fekdsper

Kaolin

Which of the following impurities are present with the bauxite.

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Silica

Ferric oxide

Alumina

Both silica and ferric oxide

Oxygen and sulphur exist in state

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Free

Combined

_{Both free & combined}

None of above

Mangalium is an alloy of.

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Al + Mg

Mg + Ai + Mn

Mg + Ai + Cu

Mg + Ai + Cu + Mn

HCIO evolves Cl2 and O2 when dissolve

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Ca

Ni

Cu

Any of above

Neon is used in neon signs for advertising purpose because.

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Neon lights are visible from long distance

Neon light are visible though fog & mist

Both A and B

None of the above

The bond between two identical non metal atoms has a pair of electrons.

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Unequally shared between the two

Transferred fully from one atom to another

With identical spins

Equally shared between them

The formula of borax glass is.

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Na2B4O7 10H2O

Na2B4O7 5H2O

Na B4 O7

None of above

Pick out the incorrect statements for transition metals.

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They have low melting and boiling points

5d-element have higher energies than 3d or 4 d elements

Zr and Hf have almost identical atomic and ionic radii

They form interstitial compounds.

Dibornae is used

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Fro high energy fuel

For welding torches

as reducing agent

All above

The compound which does not act as Lewis acid is.

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BF3

AlCl3

BeCl2

SnCl4

The polarity of bonds can lead to polarity of molecules and affect

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Melting point

Boiling point

Solubility

All of above

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