Question # 1

On hybridization of one s and one p orbitals we get.

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Two mutualy perpendicular orbitals

Two orbitals at 180^o

Four orbitals directed tetrahedrally

Three orbitals in a plane

The gases that are responsible for green house effect are.

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CO2 & CH4

CFC

N2O

All above

XeF4 is obtained, when a mixture of Xenon and fluorine in the ratio is heated in a nickle vessel at 400 ^oC

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1 : 3

5 :1

1 :20

1 :5

Group IV A consist of elements

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3

4

5

6

The process in which ore is heated generally in the absence of air, to expel water from a hydrated oxide at temperature below their melting points is called.

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calcination

Roasting

Froth floatation

Bessemerization

Which of the following statements false about transition metals.

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They form complexes

They show variable valency

All transiting metal compounds are paramagnetic

They form coloured ions

Which of the following compounds liberates CO2 on heating.

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Li2CO3

Na2CO3

K2CO3

All liberate CO2 on heating.

Aluminothermy used for on the spot welding of large iron structures is based upon the fact that.

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As compared to iron, aluminium has greatest affinity for oxygen.

As compared to aluminium, iron has greater affinity for oxygen

Reaction between aluminim and oxygen endothermic

Reaction between iron and oxygen is endothermic

Inert pair effect is that

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When an element shows incertness in chemical combination

When higher oxidation state is more stable than lower oxidation state

When an elecrron pair is present on the atom of an element

When two s -electrons or outermost shell remain paired and do not participate in bonding.

Principal constituents of noble gases is

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Argon

Neon

Xenon

Helium

A molecule the cannot be susperimposed on its mirror image is said to exhibit which of the following.

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Geometrical isomerism

Optical isomerism

Linkage isomerism

Reactive isomerism

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

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He

Ne

Argpm

Both He and Ne

The compound which does not act as Lewis acid is.

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BF3

AlCl3

BeCl2

SnCl4

The bond along Sp2 hybridization is.

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180^o

120^o

109.5^o

160^o

BCl3 is an example of hybridization

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sp

sp2

sp3

None of above

Among the elements of second period the element with highest melting point belongs to group.

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1

14

17

18

The noble gases are used due to having property

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Chomical inertness

Low boiling point

Any of a or b

Both a and b

Which of the following steps are involved in the extraction of copper.

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Roasting

Smelting

Refining

All

VBT is unable to explain the nature of some of the complexes of.

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Cobalt

Copper

Nickle

Manganese

In a period, the element with biggest electron affinity belong to.

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Group 1

Group 2

Group 17

Group 18

Which of the following compound does not following octet rule.

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CS2

PBr3

IBr

Br F3

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