Question # 1

Aluminium oxide is:

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Acidic oxide

Basic oxide

Amphoteric oxided

None of these

Bond angle is minimum for

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H₂O

H₂S

H₂Se

H₂Te

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

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Li₂O

BeO

N₂

KO₂

Which of the following phosphorus is most reactive?

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Red phosphorus

White phosphorus

Scrlet phosphorus

Violet phosphorous

NaHCO₃is prepared by

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Down's process

Solvay's process

Nelson's process

None of these

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

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 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

Which on of the following compounds does not exist?

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NCl₅

AsF₅

SbCl₅

PF₅

Sulphuric acid has great affinity for water because

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It hydrolyses the acid

It decomposes the acid

Acid forms hydrates with water

Acid decomposes water

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

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Na₂CO₃

NaHCO3

NaOH

NaOCl

Which of all following compound is not possible

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Phosphine is not obtained by the reaction when

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White P is heated with NaOH

Red P is heated with NaOH

Ca₂P₂reacts with water

PH₄l is boiled with water

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

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Alkaline earth metals are usually

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Reducing agent

Oxidizing agent

Amphoteric

Acidic

The alkaline earth elements have in their s-orbital

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One electron

Two electron

No electron

Three electron

The chemical formula of magnesite is

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MgCl₂

Mg(HCO₃)₂

MgCO₃

None of these

Which of the following sulphates is not soluble in water

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Sodium sulphate

Potassium sulphate

Zinc sulphate

Barium sulphate

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

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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 one of the following is not an alkali metal

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Francium

Caesium

Rubidium

Radium

Alkaline earth metals posses two electrons in their outermost

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F-orbital

D-orbital

S-orbital

P-orbital

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

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0

+1

+2

-1

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

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H₂

N₂

O₂

CO₂

Crystalline form of sulphur stable at room temperature is

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Rhombic sulphur

Monoclinic sulphur

Plastic sulphur

Prismatic sulphur

What causes nitrogen to be chemically inert?

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Multiple bond formation in the molecule

Absence of bond distance

Short internuclear distance

High bond energy

Each of the following is true of white and red phosphours except that they

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Are both soluble in CS₂

Can be oxidized by heating in air

Consist of the same kind of atoms

Can be converted into one another

Which of the following sulphates has the highest solubility in water

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BaSO₄

CaSO₄

MgSO₄

BeSO₄

Which of the following form normal oxide

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K

Li

Na

None

Which has soapy touch?

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Na2B4O7

H3BO3

Ca2B6O11

HBO2

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