Question # 1

Which salt is used for the treatment of hyperacidity in stomach

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NaCl

KCl

NaHCO₃

Na₂CO₃

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 element is not alkali metal

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Lithium

Rubidium

Francium

Magnesium

Chile saltpetre has the chemical formula

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NaNO₃

KNO₃

Na₂B₄O₇

Na₂CO₃H₂O

Tincal is a mineral of:

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Al

B

Si

C

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

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

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

NaHCO₃is prepared by

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Down's process

Solvay's process

Nelson's process

None of these

Which of the element is not an alkaline earth metal

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Beryllium

Strontium

Barium

Caesium

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

Which one of the following properties is not correct for ozone?

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It oxidizes lead sulphides

It oxidizes potassium iodide

It oxidizes mercury

It cannot act as a bleaching agent

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

Aluminium oxide is:

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Acidic oxide

Basic oxide

Amphoteric oxided

None of these

What is going to replace the petroleum?

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Silica

Silicates

Silicones

Silicon

Carbonates of alkali metals dissolves freely in water to form

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Acidic solutions

Neutral solution

Alkaline solution

None of these

Al is the most element in earth crust:

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O

Si

Al

Pb

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

Which of the following fluorides does not exists?

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NF₅

PF₅

AsF₅

SbF₅

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

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Be

Ra

Ba

Rn

Which one of the following pentafluorides cannot be formed?

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PF₅

AsF₅

SbF₅

BiF₅

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

What is the formula of asbestos?

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CaMg₃(SiO₃)₄

CaSiO₃

Na₂SiO₃

Mg₃H₂(SiO₃)₄

Which of the following is lighter

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Li

k

Na

Ca

The acid used in lead storage cells is

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Phosphoric acid

Nitric acid

Sulphuric acid

Hydrochloric acid

The structure of white phosphorus is

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Square planar

Pyramidal

Tetrahedral

Trigonal planer

Which on of the following compounds does not exist?

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NCl₅

AsF₅

SbCl₅

PF₅

Sodium forms largely

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Normal oxides

Per-oxides

Superoxides

None of these

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

Gypsum is a common mineral of

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Magnesium

Strontium

Calcium

Barium

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

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0

+1

+2

-1

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