Question # 1

Density of aluminium is (g cm^-3):

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B

Al

Si

Ge

Which element form group 15 gives most basic compound with hydrogen?

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Nitrogen

Bismuth

Arsenic

Phosphorus

Francium is an element at the bottom of Group I in the Periodic Table. Which one of the following predication is likely to be correct?

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It will react with water to liberate oxygen

Its hydroxide will be a strong alkali in water

Its carbonate will decompose on heating to give carbon dioxide

Its nitrate on heating will give nitrogen dioxide and oxygen

Which oxide of nitrogen is obtained on heating ammonium nitrate at 250° C?

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Nitric oxide

Nitrous oxide

Nitrogen dioxide

Dinitrogen tetraoxide

Dipole moment of CO molecule is:

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0.0

1.112 D

0.112 D

2.112 D

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

The acid which has a peroxy linkage is

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Sulphurous acid

Pyrosulphuric acid

Dithionic acid

Caro's acid

______ reacts with alkalis to give hydrogen

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Be

Mg

Ca

None

Which electronic configuration corresponds to an element of Group ||Z-A of the periodic table?

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1s, 2s², 2p⁶, 3s², 3p⁶, 4s²

1s², 2s², 2p⁶

1s², 2s², 2p⁶, 3s², 3p³

1s², 2s² , 2p⁶, 3s², 3p¹

Which of the following oxides is peroxide?

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Na₂O₂

MnO₂

BaO

SO₂

Which property is not present in Al?

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Reacts with acid

Reacts with bases

Changes litmus paper

Changes methyle orange colour

Corrundam is ore of:

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Li

Be

B

Al

Which salt is used for preserving food

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CaCl₂

NaCl

Na₂SO₄

BaCl₂

Al is the most element in earth crust:

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O

Si

Al

Pb

Which colour is imparted by sodium

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Yellow

Violet

Red

Crimson

Where lime is not used

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In refining or metals

In paper industry

In glass industry

In the preparation of NaOH

Which of the element is not alkali metal

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Lithium

Rubidium

Francium

Magnesium

Lime, calcium oxide, is used in agriculture for

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Adding ca metal in soil

Making soil acidic

Neutralizing acidic soil

Adding oxygen to soil

The chemical formula of magnesite is

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MgCl₂

Mg(HCO₃)₂

MgCO₃

None of these

Borax is a common mineral of alkali metal sodium. Its formula is

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Na₂B₄O₇

Na₂,B₄O₇. 10H₂O

Na₂B₃O₆. 10H₂O

Na₂B₄O₇- 5H₂O

Which of the following is a tetrabasic acid?

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ORthophosphoric acid

Hyposphosphorus acid

Metaphosphoric

Pyrophosphoric acid

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