Question # 1

Benzene + Ozone → Y. in this sequence Y is

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Benzene monoozonide

Benzene diozonide

Benzene triozonide

Succinic acid

The symbol of the element whose atoms have the outer most electronic configuration 2s² 2p³ is

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N

Li

P

Na

The movement of solvent molecules through a semipermeable membrane is called

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Electrolysis

Electrophoresis

Osmosis

Cataphoresis

Setting of plaster of paris involves

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Oxidation with atmospheric oxygen

Combination with atmosphere CO₂

Dehydration

Hydration to yield another hydrate.

Galena is an ore of

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Gallium

Lead

Tin

Germanium

Which of the following compounds has the lowest anion to cation size ratio?

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LiF

NaF

CsI

CsF

Which of the following is a molecular disease?

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Allergy

Cancer

German measles

Sickle cell anemia

Which has the largest radius?

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CO³⁺

Mn³⁺

Fe³⁺

Cr³⁺

Water (H2O) is liquid while hydrogen sulphide (H₂S) is a gas because

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Water has higher molecular weight

Hydrogen sulphide is a weak acid

Sulphur has high electronegativity than oxygen

Water molecules associate through hydrogen bonding.

Sodium metal cannot be stored under

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Benzene

Kerosene oil

Alcohol

Toluene

Calcium acetate when dry distilled gives

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Formaldehyde

Acetaldehyde

Acetone

Acetic anhydride

Rusting of iron is catalysed by

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Fe

O₂

Zn

H⁺

In which molecule carbon atom is sp²hybridized

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CH₄

C2H₄

C₂H₂

None of the above

ΔH_{neutralisation}is always

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positive

Negative

Zero

Positive or negative

The substance used as a smoke screen in warfare is

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SiCl₄

PH₃

PCl₅

Acetylene

If N_Ais Avogadro's number, then number of valence electrons in 4.2 g of nitride ions N^3-is

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2.4 N_A

4.2 N_A

1.6 N_A

3.2 N_A

Which of the following compounds has the lowest anion to cation size ratio?

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LiF

NaF

Csl

CsF

Phosphide ion has the electronic structure similar to that of

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Nitride ion

Fluoride ion

Sodium ion

Chloride ion

Which of the following species participate in sulphonation of benzene ring?

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H₂SO₄

HSO^-₃

SO₃

SO^-₂

The acid used in lead storage cells is

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Phosphoric acid

Nitric acid

Sulphuric acid

Hydrochloric acid

Benezene is obtained by fractional distillation of

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Heavy oil

Anthracene oil

Middle oil

Light oil

The addition of HBr is easiest with

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CH2 = CHCl

CICH = CHCl

CH3 - CH = CH2

(CH3)2 C = CH2

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