Question # 1

Which property is not present in Al?

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Reacts with acid

Reacts with bases

Changes litmus paper

Changes methyle orange colour

Sometimes a yellow turbidity appears while passing H₂S gas even in the absence of II group radicals. This is because

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Sulphur is present in the mixture as impurity

IV group radicals are precipitated as sulphides

Of the oxidation of H₂S gas by some acid radicals

III group radicals are precipitated as hydroxides

Which one of the following elements occurs free in nature?

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N

P

As

Sb

The metal with highest electrical resistance at room temperature is

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Pb

Te

Po

Fe

Which one of the following does not belong to alkaline earth metals

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Be

Ra

Ba

Rn

Crystalline form of sulphur stable at room temperature is

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Rhombic sulphur

Monoclinic sulphur

Plastic sulphur

Prismatic sulphur

______ reacts with alkalis to give hydrogen

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Be

Mg

Ca

None

The ore CaSO₄2H₂O has the general name

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Gypsum

Dolomite

Calcite

Epsom salt

The oxidation number of each element of group ll-A is

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0

+1

+2

-1

Corrundam is ore of:

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Li

Be

B

Al

Gypsum is a common mineral of

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Magnesium

Strontium

Calcium

Barium

Which of the following compound is industrially prepared by the electrolysis of solution of NaCl

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Na₂CO₃

NaHCO3

NaOH

NaOCl

______ is used in breathing equipments for mountaineers and in space craft

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Li₂O

BeO

N₂

KO₂

Which of the following is not the reactions of lithium

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Some of the elements of a period show similar behavior with the elements of next group in next period this is called

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Vertical relationship

Oblique relationship

Diagonal relationship

None

Tincal is a mineral of:

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Al

B

Si

C

Which of the following oxides is peroxide?

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Na₂O₂

MnO₂

BaO

SO₂

Which one of the following is not an alkali metal

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Francium

Caesium

Rubidium

Radium

Pb has inert pair of electrons:

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One

Two

Three

Four

Silicon atom is hybridized:

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sp

sp²

sp³

dsp²

Aluminium oxide is:

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Acidic oxide

Basic oxide

Amphoteric oxided

None of these

Ozone is not

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An allotrope

A powerful oxidizing agent

Paramagnetic

A bent molecule

Which one of the following properties is not correct for ozone?

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It oxidizes lead sulphides

It oxidizes potassium iodide

It oxidizes mercury

It cannot act as a bleaching agent

Which of the following equations represents the action of heat on NaHCO₃

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______ is called milk of magnesia

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NaOH

KOH

LiOH

None

Hypo is used in photography for

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Developing picture

Picture printed

The colour of picture

The fixation of picture

What is going to replace the petroleum?

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Silica

Silicates

Silicones

Silicon

Heavy water is obtained by

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Prolonged electrolysis of water

Dissolving heavy salt in water

Simple distillation of water

Removing impurities of calcium and magnesium form water

Bond angle is minimum for

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H₂O

H₂S

H₂Se

H₂Te

Which one of the following pentafluorides cannot be formed?

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PF₅

AsF₅

SbF₅

BiF₅

Which metal is used in the thermit process because of its activity?

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Iron

Copper

Alumnium

Zinc

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