Question # 1

Which of the following is monoatomic?

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Oxygen

Neon

Fluorine

Nitrogen.

What quantity of limestone (CaCO₃) on heating will give 56 kg of CaO?

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1000 kg

56 kg

44 kg

100 kg

Which of the following is different from the other three oxides?

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MgO

SnO

ZnO

Cr₂O₃

The percentage of oxygen in NaOH is

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40

60

8

10

Most common reactions of benzene and its derivatives are

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Electrophilic addition reactions

Electrophilic subsitution reactions

Nucleoophilic addition reactions

Nucleophilic substitution reactions

The total pressure exerted by a number of non-reacting gases is equal to the sum of partial pressure of the gases under the same conditions is known as

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Boyle's law

Charle's law

Avogadro's law

Dalton's law

Which of the following nitrogen fertilizer contain more nitrogen

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NaNO₃

KNO₃

NH₄NO₃

Urea

The essential component of organic compound is

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O

C

P

N

Which of the following imparts violet colouration to non-luiminous flame of Bunsen burner?

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NaCl₂

BaCl₂

CaCl₂

KCl

Among alkali metal salts, the lithium salts are the poorest conductors of electricity in aqueous solution because of

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Easy diffusion of Li⁺ions

Lower ability of Li⁺ions to polarize water molecules

Lowest charge to radius ratio

Higher degree of hydration of Li⁺ions

How many kinds of space lattices are possible in a crystal?

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23

7

230

14

Which of the following reaction is used for detecting presence of carbonyl group?

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Reaction with hydroxylamine

Reaction with hydrazine

Reaction with phenyl hydrazine

All

Ionic solids with defects, contain

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Equal number of cation and anion vacancies

Interstitial anions and anion vacancies

Cation vacancies only

Cation vacancies and interstitial cations

Minamata disease is due to pollution of

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Organic waste

Oil spill in water

Industrial waste containing mercury into fishing water

Arsenic into the atmosphere

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

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d-orbitals

s-orbitals

p-orbitals

None

Calcium acetate when dry distilled

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Formaldehyde

Acetaldehyde

Acetone

Acetic anhydride

Which of these is the most widely used nitrogen fertilizer in Pakistan

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Urea

Ammonium nitrate

Ammonium Sulphate

Ammonium chloride

The osmotic pressure of solution increases if

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Temperature is decreased

Solution constant is increased

Number of solute molecules are increased

Volume is increased

The number of atoms in 0.004 g of magnesium is close to

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24

2 x 10²⁰

10²⁰

6.02 x 10²³

If the solvent is inflammable for heating purpose we use

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Ice bath

Water bath

Wire gauze

Thermostat

Given below are some statements concerning formic acid, which of them is true?

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It is a weaker acid than acetic

it is a reducing agent

When its calcium salt is heated, it forms a ketone

It is an oxidizing agent

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