Question # 1

Which of all following compound is not possible

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The ore CaSO₄2H₂O has the general name

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Gypsum

Dolomite

Calcite

Epsom salt

Which element has highest oxidation potential

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Li

Be

Ba

Ra

Alkali metals react violently with halogens to form

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Hydrides

Halides

Anyhydrides

None of these

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

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0

+1

+2

-1

The number of unpaired electrons in the p-subshell of oxygen atom

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1

2

3

4

Density of aluminium is (g cm^-3):

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B

Al

Si

Ge

The alkaline earth elements have in their s-orbital

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One electron

Two electron

No electron

Three electron

Which of the following elements is not present abundantly in earth's crust?

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Silicon

Aluminium

Sodium

Oxygen

Which is litharge or massicot?

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PbO

Pb₂O

Pb₃O₄

PbO₂

Which is used in navigational equipments?

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B

Be

Mg

Al

Which of the following oxides is peroxide?

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Na₂O₂

MnO₂

BaO

SO₂

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

Polyanion formation is maximum in

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Nitrogen

Oxygen

Sulphur

Boron

Corrundam is ore of:

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Li

Be

B

Al

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

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 element forms an iron with charge 3+?

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Berylium

Aluminium

Carbon

Silicon

Marble is chemically

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CaCl₂

CaCO₃

Na₂CO₃

NaHCO₃

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

The acid used in lead storage cells is

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Phosphoric acid

Nitric acid

Sulphuric acid

Hydrochloric acid

LiOH ______ soluble than NaOH

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More soluble

Less soluble

Equally soluble

None

NaHCO₃is prepared by

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Down's process

Solvay's process

Nelson's process

None of these

Red P can be obtained form white P by

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Heating it with a catalyst in an inert atmosphere

Distilling it in an inert atmosphere

Dissolving it in CS₂and crysllizing

Melting it ad pouring the liquid into water

Calcium carbide reacts with water to produce

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Acetylene

Methane

Ethylene

Ethane

Carbonates of alkali metals dissolves freely in water to form

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Acidic solutions

Neutral solution

Alkaline solution

None of these

Which of the following compounds is explosive in nature?

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Phosphorus trichloride

Nitrogen trichloride

Hyponitrous acid

Nitrosyl chloride

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

Which of the following form normal oxide

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K

Li

Na

None

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

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Na₂CO₃

NaHCO3

NaOH

NaOCl

What is going to replace the petroleum?

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Silica

Silicates

Silicones

Silicon

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ECAT Chemistry Chapter 14 Group IIIA & IVA Elements Online Test MCQs With Answers

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