Question # 1

Marble is chemically

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CaCl₂

CaCO₃

Na₂CO₃

NaHCO₃

Which is litharge or massicot?

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PbO

Pb₂O

Pb₃O₄

PbO₂

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

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0

+1

+2

-1

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

Permonosulphuric acid is known as

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Marshall's acid

Carlo's acid

Sulphuric acid

None of these

HNO₂acts as an/a

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Acid

Oxidizing agent

Reducing agent

All the three

Which is used to remove air bubbles form metals?

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B

Be

Mg

Al

When SO₂is passed through acidified K₂Cr₂O₇solution

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The solution turns blue

The solution is decolourised

SO₂is reduced

Green Cr₂(SO₄)₃is formed

NaHCO₃is commonly called

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Soda ash

Baking soda

Washing soda

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 one of the following does not belong to alkaline earth metals

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Be

Ra

Ba

Rn

Potassium superoxide has a use in breathing equipment in space crafts. The balanced equation for the reaction is

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The alkali metals form

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Ionic bond

Covalent bond

Co-ordinate bond

H-bond

Which of the following statement is not related to Solvay's process of Na₂CO₃

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Cheap materials

Pure product

Continuous process

Harmful by-products

In a group IIA from top to bottom as the atomic number increases, there is regular decreases in

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Ionic size

Atomic size

Ionization potential

None of these

Which has soapy touch?

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Na2B4O7

H3BO3

Ca2B6O11

HBO2

As a fixing agent in photography, sodium thisoulphate is used for

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Dissolving out unreacted silver bromide

Converting silver

Reducing solubility of AgBr

Preventing overdeveloping and fogging

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

NaHCO₃is prepared by

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Down's process

Solvay's process

Nelson's process

None of these

Silicon atom is hybridized:

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sp

sp²

sp³

dsp²

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

Which of the following elements is most metallic?

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P

As

Sb

Bi

When ammonia is heated with cupric oxide, a molecule of ammonia will

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Gain 3 electrons

Lose 3 electrons

Gain 2 electrons

Lose 2 electrons

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

Alkaline earth metals posses two electrons in their outermost

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F-orbital

D-orbital

S-orbital

P-orbital

Which is an essential constituent of chlorophyll

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Be

Fe

Mg

Ca

Which of the following is the hardest metal among following

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Li

Na

Rb

K

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

Sodium forms largely

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Normal oxides

Per-oxides

Superoxides

None of these

The chemical formula of Epson salt is

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MgSO₄

MgCl₂

MgSO₄. 7H₂O

MgCl₂. 7H₂O

When sulphur is boiled with Na₂SO₃solution, the compound formed is

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Sodium sulphides

Sodiums sulphates

Sodium persulphate

Sodium thiosulphate

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