Question # 1

Atomic volume of C, N, O and F are in the order

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C > N > F > O

C > N > O > F

F > O > N >C

N > C > O >F

The shape of SO₄^2-ion is.

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Tetrahedral

Trigonal planar

Square planar

Octahedral

Among all halogens no oxyacid of the following is known

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F

Cl

Br

I

Mostly used solvents for ionic compounds.

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Liquid ammonia

Liquid SO2

Liquid HF

All above

Among alkali metals, the least metallic element is.

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Li

Na

Rb

Cs

Of the molecules, SF4, XeF4, and CF which has square planar geometry.

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SF4, XeF4 and CF4

Sf4 only

CF4 only

XeF4

Gases and dust particles are removed from H2SO4 by

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Tydal effect

Drying tower

Absorption tower

Contact converter

Which group contains elements that exist as monoatomic molecules.

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1

2

14

18

In bi sulphate ion, the formal charge on sulphru atom is.

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+1

+2

+4

+6

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

Copper is resistant to

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Air

Water

Acid and Alkali

All of the above

In group theory the triple degenerate set is denoted by

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eg

t2g

e2g

tg

Chlorine gas acts as a bleaching agent only in presence of.

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dry air

Moisture

Sunlight

Pure oxygen

The value of Kw increase with temperature because the ionization of water.

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Positive

Negative

Endothermic

Exothermic

Valences bond theory was put forward by

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Pauling and Slatter

Heitler and London

Lewis

Pauli

Diamond and carbon are the _________ forms of carbon

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Isotropic

amorphous

Allotropic

Isomeric

A general trend in the properties of elements of carbon family shows that with increase in atomic number.

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The tendency towards concatenation increases

The tendency to show +2 oxidation state increase

Metallic character decreases

The tendency to form complexes with convalency higher than four decreases.

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

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Li, Na, K

F, Cl, Br

Be, Mg, Ca

O, S , Se

Which one of the following ionsis colourless.

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Cu+

Ni2+

Co2+

Fe3+

In the metallurgy of iron, when limestone is added to the blast furnaced, the calcium ion ends up in

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Slag

Gangue

Metallic calcium

Calcium carbonate

Which can be purified by sublimation

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F2

Cl2

Be2

I2

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