Question # 1

Which of the following fluorides does not exists?

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NF₅

PF₅

AsF₅

SbF₅

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

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 element is not alkali metal

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Lithium

Rubidium

Francium

Magnesium

Alkaline earth metals posses two electrons in their outermost

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F-orbital

D-orbital

S-orbital

P-orbital

What is going to replace the petroleum?

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Silica

Silicates

Silicones

Silicon

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

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Iron

Copper

Alumnium

Zinc

Which of the following element is most reactive

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Li

Na

K

Cs

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

Baking powder has which one of the following formula

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Na₂CO₃

Na₂SO₄

NaHCO₃

K₂CO₃

Chile saltpetre has the chemical formula

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NaNO₃

KNO₃

Na₂B₄O₇

Na₂CO₃H₂O

The metal with highest electrical resistance at room temperature is

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Pb

Te

Po

Fe

Phosphide ion has the electronic structure similar to that of

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Nitride ion

Fluoride ion

Sodium ion

Chloride ion

Boric acid cannot be used:

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An antiseptic in medicine

For washing eyes

In soda bottles

For enamels and glazes

Which of all following compound is not possible

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Which is an essential constituent of chlorophyll

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Be

Fe

Mg

Ca

Polyanion formation is maximum in

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Nitrogen

Oxygen

Sulphur

Boron

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

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Barium

Iodine

Lead

Oxygen

Which is not the form of silica?

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Amethyst quatz

Rose quatz

Smoky

None of these

Crystalline form of sulphur stable at room temperature is

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Rhombic sulphur

Monoclinic sulphur

Plastic sulphur

Prismatic sulphur

Which element forms an iron with charge 3+?

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Berylium

Aluminium

Carbon

Silicon

Which of the following is a tetrabasic acid?

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ORthophosphoric acid

Hyposphosphorus acid

Metaphosphoric

Pyrophosphoric acid

The oxide of beryllium is

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Acidic

Amphoteric

Superoxide

Basic

Ozone is not

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An allotrope

A powerful oxidizing agent

Paramagnetic

A bent molecule

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

Al is the most element in earth crust:

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O

Si

Al

Pb

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

Alkali metals react violently with halogens to form

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Hydrides

Halides

Anyhydrides

None of these

Which shows maximum catenation property?

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S

Se

Te

O

Which of the following compounds is explosive in nature?

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Phosphorus trichloride

Nitrogen trichloride

Hyponitrous acid

Nitrosyl chloride

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