Question # 1

The maximum covalence of an element equal to.

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The number of unpaired d electrons

The number of paired p electrons

The number of unpaired a and P electors

The actual number of a and P electrons in the outermost shell

Stainless steel consists of which elements.

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Fe only

Cr only

Fe and Ni

Fe ,Ni and Cr

Which metal can produce dihydrogen gas by reaction with dil H2SO4

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Ag

Fe

Cu

Pt

pH of pure water at 25 ^oC. kw = 1 x 10^-4

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0

7

14

None of above

Which of the following hydroxides has the maximum solubility in water.

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Mg (OH)2

Ca (OH)2

Sr (OH)2

Ba (OH)2

Noble gases are sparingly soluble in water owing to.

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Dipole -dipole interactions

Dipole -induced dipole interactions

Hydrogen bonding

Induced dipole -instantaneous dipole interactions

The number of electrons involved in bonding in Lewis structure of oxalate ion is

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20

14

22

18

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

Phosphoric acid is the most important of the phosphorus oxy acids. Industrially phosphoric acid is prepared by.

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The Ostwald process

The Haber's process

The reaction of phosphate rock with sulphuric acid

The reaction P4O10 with water.

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

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Grey

Black

Yellow

Violet

The element with the highest first ionization potential is.

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Boron

Carbon

Nitrogen

Oxygen

The noble gas which was discovered first in the sun and then on the earth is.

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Helium

Neon

Argon

Xenon

Blue color of glass of due to the presence of .

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Cobalt (II)

Chromium (III)

Iron (III)

copper (II)

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

One of the best fluorinating agent is

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XeF2

XeF4

XeF6

None of above

Of the following the commonly used n the laboratory desiccator is.

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Anhyd. Na2Co3

Anhyd Ca Cl2

Dry NaCl

None of the above

Which of the following pentahalides is not formed.

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NF5

PF5

AsF5

BiF5

Which of the following elements would have the lowest first ionization energy

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Mg

Rb

Li

Ca

The geometry of Xe F2 is

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Triangular planar

Square planar

Linear

Trigonal bipyramidal

Which of the following elements with excess oxygen to form proxides.

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Ca

Mg

Li

Ba

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

Separation of isotopes of uranium is carried out by

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CaF2

SF6

HF

All above

The bond formed by complete transfer of electrons from electropositive to more electronegative atom is called.

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Ionic bond

Covalent bond

Mettalic bond

Co ordinates bond

The Lewis structure of which of the following does not have coordinate bond.

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SO2

HNO3

H2SO4

HNO2

The oxidation state of HCiO4

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+ 7

+ 3

+ 5

+ 1

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