Question # 1

The colour of calcium metal flame is

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Golden yellow

Brilliant white

Brick red

Light green

Sodium - potassium alloy is used in nuclear reactor as a:

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catalyst

coolant

reactant

absorber

Sodium is exterminate reactive metal, but it does not react with:

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Hydrogen

Nitrogen

Sulphur

Phosphorus

Which one metal is least reactive?

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K

Fe

Cu

AI

Which one is least reactive non-metal?

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P

C

CI

F

Halogens with metals for

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Ionic bond

Covalent bond

Dative covalent bond

Metallic bond

Metals lose their electrons easily because:

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They are electronegative

They have electron affinity

They are electropositive

Good conductors of heat

Pure alkali metals can be cut simply by knife but iron cannot because of alkali metals have:

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Strong metallic bonding.

Weak metallic bonding

Non- metallic bonding

Moderate metallic bonding

The core of the earth is ____________ than crust.

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LIghter

Heavier

Both

Nil

Gold can only be dissolved by:

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Acids

Bases

Aqua Regia

Nil

Non-metals are generally soft, but which one of the following is extremely hard?

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Graphite

Phosphorus

Iodine

Diamond

Which one is least oxidizing agent?

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F

CI

I

Br

All metals are solid except

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AI

Mg

Na

Hg

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Chemistry 9th Class English Medium Unit 8 Online Test MCQs With Answers

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