Question # 1

Potassium crystallizes in a body centered lattice. Hence, the coordination number of potassium in potassium metal is.

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4

6

8

12

Which type of elements form ionic hydrides.

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Transitionelements

Metalloids

Elements with high electronegativity

Elements with high electropositivity.

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.

Most electronegative element is.

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C

Si

Pb

Sn

The correct order of thermal stabilities of hydriedes of group 15 is.

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NH3 > PH3 > AsH3 > BiH3> SbH3

NH3 > PH3 >AsH3 > SbH3> BiH3

NH3 < PH3 < SbH3 > AsH3 > BiH3

BiH3 > Sb H3 > AsH3 > PH3 > NH3

Among alkali metals, the least metallic element is.

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Li

Na

Rb

Cs

The noble gases which does not I do not form any clathrates is.

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He

Ne

Argpm

Both He and Ne

Dry ice is

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Solid CO

Solid CO2

Solid NH3

Solid SO2

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

Gold dissolves in aqua regia forming

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AuCl

Au(NO3)3

AuCl3

HAuCl4

Group IV A consist elements.

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3

4

5

6

Principal constituents of noble gases is

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Argon

Neon

Xenon

Helium

H2SO4 is manufactured by

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The lead chamber process

The contact process

Both A and B

The Ostwald's process

Ionization potential of carbon is.

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11.2

7.8

8.1

7.3

The geometry of Xe F2 is

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Triangular planar

Square planar

Linear

Trigonal bipyramidal

Which among the following is least soluble in water.

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NaF

LiF

KF

CsF

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

Which of the following carbonates decomposes at the highest temperature.

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Mg CO3

CaCO3

Sr CO3

Ba CO3

Amorphous boron on burning in air form

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B(OH)3

Only B2O3

Only BN

Mixture of B2O3 and BN

Which one of following is non polar

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CH2Cl2

CCl4

CHCl3

CH3Cl

Helium is used for

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The preservation of food

Filling electrical transformer

Pressuring agent in rockets

All of above

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