Question # 1

The element which has a simple cubic lattice in solid state is

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Se

Te

Po

None of these

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

White P when boiled with strong solution of caustic soda produces

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Phosphine

Posh acid

Phosphorous acid

None

Which of the element is not an alkaline earth metal

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Beryllium

Strontium

Barium

Caesium

White phosphorus is

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A mono atomic gas

P₄, a tetrahedral solid

P₈, a crown

A linear diatomic molecule

Which carbonate of alkali metals is insoluble in water

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Na₂CO₃

K₂CO₃

Li₂CO₃

Cs₂CO₃

Chile saltpetre has the chemical formula

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NaNO₃

KNO₃

Na₂B₄O₇

Na₂CO₃H₂O

Which is not the form of silica?

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Amethyst quatz

Rose quatz

Smoky

None of these

The silver bromide in hypo (Na₂S₂O_{3) solution is}

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Soluble

Not soluble

Precipitated

Not effect

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

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Iron

Copper

Alumnium

Zinc

Which of the following fluorides does not exists?

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NF₅

PF₅

AsF₅

SbF₅

Which salt is used for the treatment of hyperacidity in stomach

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NaCl

KCl

NaHCO₃

Na₂CO₃

Permonosulphuric acid is known as

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Marshall's acid

Carlo's acid

Sulphuric acid

None of these

Which shows maximum catenation property?

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S

Se

Te

O

______ is called milk of magnesia

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NaOH

KOH

LiOH

None

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

______ gives peroxide

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Li

Ba

Sr

Be

The alkali metals form

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Ionic bond

Covalent bond

Co-ordinate bond

H-bond

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

Al is the most element in earth crust:

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O

Si

Al

Pb

The oxyacids of phosphorus in which phosphorus has the lowest oxidiation state is

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Hypophosphorus acid

Orthophosphorus acid

Pyrophosphorus acid

Metaphosphorus acid

Alkali metals react violently with halogens to form

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Hydrides

Halides

Anyhydrides

None of these

Which is an essential constituent of chlorophyll

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Be

Fe

Mg

Ca

Which of the following are electropositive in nature

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Alkali metals

Alkaline earth metals

Halogens

Alkali and alkaline earth metals

Borax is a common mineral of alkali metal sodium. Its formula is

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Na₂B₄O₇

Na₂,B₄O₇. 10H₂O

Na₂B₃O₆. 10H₂O

Na₂B₄O₇- 5H₂O

Plaster of pares is obtained by heating

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Gypsum

Epsom

Lime stone

Dolomite

The chemical formula of gypsum is

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CaSO₄. 5H₂O

CaSO₄. 4H₂O

CaSO₄. 2H₂O

None of these

Polyanion formation is maximum in

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Nitrogen

Oxygen

Sulphur

Boron

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

Basicity of orthoposphoric acid is

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2

3

4

5

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

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