Question # 1

The acid used in lead storage cells is

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Phosphoric acid

Nitric acid

Sulphuric acid

Hydrochloric acid

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

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

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Nitrogen

Bismuth

Arsenic

Phosphorus

Down's cell is used to prepare

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Sodium carbonate

Sodium bicarbonate

Sodium metal

Sodium hydroxide

Which carbonate of alkali metals is insoluble in water

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Na₂CO₃

K₂CO₃

Li₂CO₃

Cs₂CO₃

White P when boiled with strong solution of caustic soda produces

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Phosphine

Posh acid

Phosphorous acid

None

When sulphur is boiled with Na₂SO₃solution, the compound formed is

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Sodium sulphides

Sodiums sulphates

Sodium persulphate

Sodium thiosulphate

Group VA of the periodic table consists of the elements N, P, As, Sb and Bi, On passing from N to Bi, the oxides of the elements of general formula M₂O₃become

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Stronger reducing agents

More ionic

More basic

More volatile

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

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Borax is hydrated:

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Penta

Deca

Hepta

Octa

______ reacts with alkalis to give hydrogen

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Be

Mg

Ca

None

Oleum is

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Castor oil

Oil of vitriol

Fuming of H₂SO₄

None of them

Which of the following phosphorus is most reactive?

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Red phosphorus

White phosphorus

Scrlet phosphorus

Violet phosphorous

The oxyacids of phosphorus in which phosphorus has the lowest oxidiation state is

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Hypophosphorus acid

Orthophosphorus acid

Pyrophosphorus acid

Metaphosphorus acid

Which is an essential constituent of chlorophyll

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Be

Fe

Mg

Ca

Which of the following sulphates is not soluble in water

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Sodium sulphate

Potassium sulphate

Zinc sulphate

Barium sulphate

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

The element caesium bears resemblance with

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Ca

Cr

Rubidium

None of the above

Calcium carbide reacts with water to produce

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Acetylene

Methane

Ethylene

Ethane

Sodium forms largely

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Normal oxides

Per-oxides

Superoxides

None of these

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

Which is litharge or massicot?

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PbO

Pb₂O

Pb₃O₄

PbO₂

Marble is chemically

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CaCl₂

CaCO₃

Na₂CO₃

NaHCO₃

Which of the following element is most reactive

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Li

Na

K

Cs

Basicity of orthoposphoric acid is

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2

3

4

5

The metal with highest electrical resistance at room temperature is

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Pb

Te

Po

Fe

Which of the following oxides is peroxide?

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Na₂O₂

MnO₂

BaO

SO₂

Phosphide ion has the electronic structure similar to that of

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Nitride ion

Fluoride ion

Sodium ion

Chloride ion

Electron affinity of sulphur is

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More than O and Se

More than O but less than Se

Less than O but more than Se

Equal to O and Se

Which one of the following equations represent the reaction that occurs when calcium nitrate is heated strongly

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Which of the following fluorides does not exists?

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NF₅

PF₅

AsF₅

SbF₅

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