Question # 1

Which of the following reactions is employed to produce ozone in the laboratory.

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Exposure of air to UV light

Reaction of F2 with H2O at low temperature

Reaction SO2 with H2O2

Passage of silent electric discharge through oxygen

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 halide has lowest melting point.

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NaCl

NaF

NaBr

NaI

At high temperature nitrogen combines with calcium carbide to give

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Calcium cyanide

Calcium cyanamide

Calcium nitride

Calcium cabonate

Which of the following is an allotrops of hydrogen.

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0- H2

P-H2

Both A and B

None of these

What types of bonding occurs in d-block elements.

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Ionic

Covalent

Metallic

Both B and C

Pig iron is also called.

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Cast iron

Steel

Wrought iron

Stainless steel

Which of the following is the active ingredient in ordinary household bleach.

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HCl

Cl2

NaCl

NaCIO

Aluminum occurs in nature as.

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Native

Combined form

Both native and combined

Free

Group VII A of periodic table consist of elements.

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4

5

6

7

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

Fluorine form Fluorides reacting with

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Metals

Non metals

Metalloide

Any of above

Which element out of the following can exhibit a maximum co valency of seven.

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Chlorine

Fluorine

Sulphur

Both Cl and F

In the Lewis formula of which of the following species, the number of single double and dative bonds are equal.

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N2O3

HNO3

SO2

SOCl2

The Lewis formula of SOCl2, the total number of bond pairs and lone pairs of electron around sulphur are.

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2 ,1

2,2

3,1

3,0

Which of the following elements has the highest melting point.

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Magnesium

Calcium

Strontium

Berylliium

Molecule is a diatomic

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Nitrogen

Phosphorous

Arsenic

Antimony

Formula of orthophosphoric acid

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H2PO4

H3PO2

H2P2O5

The law of trinds was proposed by

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Dobereiner

Newlands

Lother Mayer

Chancourtois

Pick out the incorrect statement for SO2

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It turns filter paper moistened with acidified K2Cr2O7

It turns starch iodate paper blue

It does not react with chlorine in presence of charcoal

It decolourises acidified KMnO4 solution.

Zeigler Natta catalyst is.

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Pt/PtO

TiCl4/Al(C2H5)3

Pt/Rh

Pt

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