Question # 1

The maximum number of electrons in the outermost shall of s-black elements is

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One

Two

Three

Four

Sodium should be stored in

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Air free from moisture

Air free form carbon dioxide

Under water

Under kerosene oil

Which of the following is the hardest metal among following

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Li

Na

Rb

K

______ reacts with alkalis to give hydrogen

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Be

Mg

Ca

None

Pb has inert pair of electrons:

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One

Two

Three

Four

Which of the following phosphorus is most reactive?

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Red phosphorus

White phosphorus

Scrlet phosphorus

Violet phosphorous

Which of the following sulphates is not soluble in water

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Sodium sulphate

Potassium sulphate

Zinc sulphate

Barium sulphate

Borax is hydrated:

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Penta

Deca

Hepta

Octa

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

Which of the following element is most reactive

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Li

Na

K

Cs

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

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Be

Ra

Ba

Rn

Which of the following has highest dipole moment?

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NH₃

PH₃

AsH₃

SbH₃

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

Sulphuric acid reacts with PCl₅to give

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Thionyl chloride

Sulphur monochloride

Sulphuryl chloride

Sulphur tetrachloride

Copper oxide is dedected by borax bead test with colour:

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Blue

Red

Yellow

Black

The most acidic of the following compounds is

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P₂O₃

Sb₂O₃

B₂O₃

As₂O₃

______ gives peroxide

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Li

Ba

Sr

Be

Which of the following fluorides does not exists?

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NF₅

PF₅

AsF₅

SbF₅

Oleum is

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Castor oil

Oil of vitriol

Fuming of H₂SO₄

None of them

Hypo is used in photography for

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Developing picture

Picture printed

The colour of picture

The fixation of picture

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

Basicity of orthoposphoric acid is

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2

3

4

5

Ozone is not

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An allotrope

A powerful oxidizing agent

Paramagnetic

A bent molecule

White phosphorus is

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A mono atomic gas

P₄, a tetrahedral solid

P₈, a crown

A linear diatomic molecule

Which of the following oxides is peroxide?

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Na₂O₂

MnO₂

BaO

SO₂

Crystalline form of sulphur stable at room temperature is

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Rhombic sulphur

Monoclinic sulphur

Plastic sulphur

Prismatic sulphur

The alkali metals form

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Ionic bond

Covalent bond

Co-ordinate bond

H-bond

P₂O₅is heated with water to give

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Hypophosphorus acid

Phosphorus acid

Hypophosphorus acid

Orthophosphorus acid

Which of the following salt is used as purgative

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CaSO₄

MgSO₄

BeSO₄

NaCl

Identify the incorrect statement with respect to ozone

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Ozone is formed in the upper atmosphere by a photochemical reaction involving dioxygen

Ozone is more reactive than diaoxygen

Ozone is diamagnetic whereas dioxygen is paramagnetic

Ozone protects the earth's inhabitants by absorbing gamma-radiations

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

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Be

Mg

Ca

Sr

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