Question # 1

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

Inert pair effect is best shown by

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Si

Z

Sn

Pb

Which of the following impurities are present with the bauxite.

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Silica

Ferric oxide

Alumina

Both silica and ferric oxide

Which of the following iso -electronic ion would require least energy for the removal of electron.

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Ca2+

Cl-

Ar-

K+

For covalent bond to form between two atoms A and B

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Transference of electrons must take place from A to B

A pair of electrons of A is shared by both A and B

A and B contribute equal no. of electrons for mutual sharing by A and B

One of the atom A or B must already have octet of electrons.

Finely divided iron combines with CO to give.

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Fe(CO)5

Fe2(CO)9

Fe(CO)12

Fe(CO)6

pKa value of hyponitrous acid is.

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-7.0

8.9

4.1

6.6

Which of the following configuration of an ionic species represents psedue noble gas configuration.

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ns2

ns2 np6

ns2 np6 nd 10

ns2 np3

Which of the following statements is wrong.

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Covenant compounds are generally soluble is polar solvents.

Covalent compounds have low melting and boiling points

Lower than that of separate H atoms

Sometimes lower and sometimes higher than that of separate H

Gases and dust particles are removed from H2SO4 by

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Tydal effect

Drying tower

Absorption tower

Contact converter

The halide which is inert to water is

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PCl5

SiCl4

BCl3

SF3

Which among the following elements has the highest value of IE.

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Mg

Na

Ca

Sr

By applying an external force the ionic solid can be easily broken to powder form so the ionic solid are highly

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Hard

Brittle

Tough

Soft

Co ordinate covalent bond found is formed by the

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Transference of electrons

Sharing of electrons

Donation of electrons

None of these

H-Bond has more energy than the van der Waals forces i.e.

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1.0 kcal/mole

2.0 k cal/mole

10.0 kcal/mole

20. 0 kcal mole

Bases and reducing agents are electron giving agents and also called as.

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Electrodotic

Electrophile

Nucleophile

None of above

The electromagevitiy of the following elements increase in the order

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F > Cl > O > S

S > Cl > O > F

F > O > N > C

C > O > N > F

Argon is used in filling of.

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Discharge tubes

Luminous tube

Fluorescent tubes

None of above

Principal constituents of noble gases is

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Argon

Neon

Xenon

Helium

The fluoride tooth paste contains

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SnF2 and Sn2P2O7

NaF

CaF2

None of these

The most stable oxidation state shown by lead is.

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+2 , +4

+2 only

+3 , +4

+4 only

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