Question # 1

Which metal of Group-II A of the periodic Table, will form the least ionic chloride

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Be

Mg

Ca

Sr

Which of the following compounds is explosive in nature?

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Phosphorus trichloride

Nitrogen trichloride

Hyponitrous acid

Nitrosyl chloride

Crystalline form of sulphur stable at room temperature is

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Rhombic sulphur

Monoclinic sulphur

Plastic sulphur

Prismatic sulphur

What is going to replace the petroleum?

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Silica

Silicates

Silicones

Silicon

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

Which is not the form of silica?

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Amethyst quatz

Rose quatz

Smoky

None of these

Which of the element is not alkali metal

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Lithium

Rubidium

Francium

Magnesium

Alkali metals react violently with halogens to form

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Hydrides

Halides

Anyhydrides

None of these

The ore CaSO₄2H₂O has the general name

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Gypsum

Dolomite

Calcite

Epsom salt

HNO₂acts as an/a

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Acid

Oxidizing agent

Reducing agent

All the three

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

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Iron

Copper

Alumnium

Zinc

The chemical formula of chile salt peter is

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Na₂CO₃

KNO₃

NaNO₃

NaNO₂

Which of the following is formed by the action of water on sodium peroxide?

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H₂

N₂

O₂

CO₂

White phosphorus is

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A mono atomic gas

P₄, a tetrahedral solid

P₈, a crown

A linear diatomic molecule

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

NaHCO₃is commonly called

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Soda ash

Baking soda

Washing soda

None of these

Chemical composition of colemnite is:

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Ca₂B₆O₁₁.5H₂O

CaB₄O₇ .4 H₂O

Na₂B₇O₇. 4 H₂O

CaNaB₅O₉.8H₂O

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

Which one of the following pentafluorides cannot be formed?

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PF₅

AsF₅

SbF₅

BiF₅

S-block elements consist of

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Alkali metals

Alkaline earth metals

Alkali and alkaline earth metals

None of these

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

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Li₂O

BeO

N₂

KO₂

Lithium reacts with air to form

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Peroxide

Normal oxide

Superoxide

None of these

Orthophosphoric acid is

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Monobasic

Dibasic

Tribasic

Tetrabasic

The number of electron that are paired in oxygen molecule are

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16

12

14

7

P₂O₅is heated with water to give

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Hypophosphorus acid

Phosphorus acid

Hypophosphorus acid

Orthophosphorus acid

Where lime is not used

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In refining or metals

In paper industry

In glass industry

In the preparation of NaOH

The chemical formula of Trona is

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KCl . MgCl₂. 6H₂O

Na₂CO₃. 2NaHCO₃. 2H₂O

Na₂CO₃. H₂O

KCl

Sodium is manufacture by the electrolysis of fused sodium chloride and not from an aqueous solution of sodium chloride because

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Sodium chloride does not ionize in the water solution

Sodium chloride is not soluble in water

Sodium deposited at the cathode may react with water to form sodium hydroxide

Electricity does not pass through aqueous NaCl

______ gives peroxide

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Li

Ba

Sr

Be

Which element among the following belongs to Group IV-A of the periodic table?

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Barium

Iodine

Lead

Oxygen

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

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Be

Ra

Ba

Rn

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