Question # 1

Iodine is a grey black solid and its vapours are in color

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Grey

Black

Yellow

Violet

The valence shell electronic configuration of group III A is.

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ns1 p2

ns2 p1

ns3p2

ns2p2

Ionic compounds in general possess both

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High melting point and non -directional bonds

High melting points and low boiling poinits

Directional bonds and low boiling points

High solubility in polar and non -polar bonds.

Boron does not form B3+ ion because.

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It has small size and high ionization energy

It has high electromagnetically

It has high charge density

None of the above

Which trihalide is not hydrolysed by water

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NF3

NCl3

PCl3

AsCl3

Which number of halogen family does not show positive oxidation state.

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Fluorine

Chlorine

Bromine

Iodine

H-Bonding also ox in ling system like

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Protein

DNA

Botha A and B

None of above

The _________ sphere is enclosed in brackets in formulas for complex species, and it includes the central metal ion plus the coordinated group

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Ligand

Donor

Coordination

Oxiation

pKa value of hyponitrous acid is.

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-7.0

8.9

4.1

6.6

Solid sodium chloride does not conduct electricity be cause.

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In solid NaCl, no ions are present

Solid NaCl is covalent in nature

In solid NaCl, there is no mobility of ions

In solid NaCl, there are no electrons.

HCIO4, HNO3 and HCL are all strong acids in aqueous solution inglacial acetic acid medium, their acid strength is such that.

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HCIO4 > HCL > HNO3

HNO3 > HCIO4 > HCl

HCl > HCIO4 > HNO3

The most common oxidation state of alkaline earth metals is.

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+1

+2

-2

-1

The compound insoluble in acetic acid is.

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Calcium oxide

Calcium carbonate

Calcium oxalate

Calcium hydroxide

Ionization potential of carbon is.

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11.2

7.8

8.1

7.3

CCl4 has zero dipole moment because of.

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Planar structure

Tetrahedral structure

Similar size of C and Cl atoms

Similar electrons affinity of C and Cl

Which of the following is not a characteristic of covalent compound.

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They have low melting and boiling points.

They ionize on dissolution in polar solvents

Their molecules have definite geometry

They are generally insoluble in water

CoCl3 ,6NH3 has six NH3 molecules that satisfy the valency of the Cu3+ metal ion

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Primary

Secondary

Both A and B

None of above

The process of heating to redness and then slow cooling in known as

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Tempering

Annealing

Quenching

Hardening

Among the elements A, B,C and D having atomic numbers 7,8,9 AND 12 Respectively, the element with smallest size and highest IE is.

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A

B

C

D

Co ordinate compounds are

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Polar

Non polar

Dem polar

None of above

Which two atoms of hydrogen combine to form a molecule of hydrogen gas. the energy of the hydrogen molecule is.

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Higher than that of separate H atoms

Equal to that of separate H atoms

Lower than that of separate H atoms

Sometimes lower and sometimes higher than that of separate H.

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