Question # 1

Calcium cyanamide on treatment with steam under pressure gives NH₃and

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Calcium carbonate

Calcium hydroxide

Calcium oxide

Calcium bicarbonate

Aldehydes are produce in atmosphere by

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Oxidation of secondary alcohols

Reduction of alkenes

Reaction of oxygen atoms with hydrocarbons

Reaction of oxygen atoms with ozone.

The mass of the neutron is of the order of

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10^-23kg

10^-24kg

10^-26kg

10^-27kg

Gooch Crucible used to filter the solution of

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H₂SO₄

HCI

KMnO₄

Both B & C

The credit of discovering neutron goes to

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Rutherford

Langmuir

Chadwick

Austen

The reagent which forms crystalline osazone derivation when treated with glucose is

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Fehling solution

Phenyl hydrazine

Benedict solution

Hydroxyl amine

When KClO₃is heated, it decomposes into KCl and O_{2. If some MnO2 is added, the reaction goes much faster because}

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MnO₂decomposes to give O₂

MnO₂provide heat by reacting

Better contact is provided by MnO₂

MnO₂acts as a catalyst.

Vitamin A is present in

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Liver

Milk

Green vegetables

All

Which of the following elements is most electronegative?

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Oxygen

Chlorine

Nitrogen

Fuorine

Which one of the following elements occurs free in nature?

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N

P

As

Sb

Acid rains are produced by

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Excess NO₂ and SO₂from burning fossil fuels

Excess production of NH₃ by industry and coal gas

Excess release of carbon monoxide by incomplete combustion

Excess formation of CO₂ by combustion and animal respiration

Which one is not usually used for the crystallization?

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Acetone

Acetic acid

Sulphuric acid

Chloroform

The density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepare by a chemical reaction form a compound of nitrogen due to the presence of the following in aerial nitrogen.

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Argon

CO₂

Some nitrogen molecules analogous to O2

Greater amount of nitrogen molecules derived from N¹⁵isotope.

The most reactive compound for electrophilic nitration will be

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Benzyl chloride

Benzoic acid

Nitrobenzene

Chlorobenzene

Heating a mixture of sodium benzoate and soda lime gives

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Methane

Benzene

Sodium benzoate

Calcium benzoate

Crystal can be classified in to -------------- basic crystal habits

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7

3

14

3

The total number of protons in 10 g of calcium carbonate is (N₀= 6.023 x 10²³)

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1.5057 x 10²⁴

2.0478 x 10²⁴

3.0115 x 10²⁴

4.0956 x 10²⁴

Aluminothermy used for on the spot welding of large iron structure is based upon the fact that

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As compared to iron, aluminium has greater affinity for oxygen

As compared to aluminium, iron has greater affinity for oxygen

Refraction between aluminium and oxygen is endothermic

Reaction between iron and oxygen is endothermic.

Fluorine does not show positive oxidation states due to the absence of

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d-orbitals

s-orbitals

p-orbitals

None

Iron, once dipped in concentrated H₂SO₄, does not displace copper from copper sulphates solution, because

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It is less reactive than copper

A layer of sulphates is deposited on it

An inert layer of iron oxide is deposited on it.

All valence electrons of iron are consumed.

Sulphure dioxide affects

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Cell wall

Plasmodesmata

All membrane systems

Nucleus

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