Question # 1

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

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Graphite

Phosphorus

Iodine

Diamond

Metals lose their electrons easily because:

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They are electronegative

They have electron affinity

They are electropositive

Good conductors of heat

Gold can only be dissolved by:

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Acids

Bases

Aqua Regia

Nil

Which one metal can be cut with a knife?

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Na

Mg

AI

Ca

Halogens with metals for

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Ionic bond

Covalent bond

Dative covalent bond

Metallic bond

All are noble metals except:

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Silver

Gold

Hydrogen

Platinum

The colour of calcium metal flame is

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Golden yellow

Brilliant white

Brick red

Light green

Which one of the following is brittle?

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Sodium

Aluminum

Selenium

Magnesium

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

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catalyst

coolant

reactant

absorber

The core of the earth is ____________ than crust.

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LIghter

Heavier

Both

Nil

Silver is a ____________ metal.

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Pure

Noble

None

All

Hydrogen is a ____________

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Metal

Non metal

Metalloids

Nil

Which of the following is less malleable?

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Sodium

Iron

Gold

Sliver

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