Question # 1

Aluminium is in Group lll, its oxide will have the formula.

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AlO

AlO₂

Al₂O₃

Al₃O₂

Benedict solution gives a positive test with but catalyze the same reaction:

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fructose

glucose

starch

sucrose

During the manufacturing process of cement the temperature of the decomposition zone goes up to

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600°C

800°C

1000°C

1200°C

Newspaper can be recycled again and again by how many times?

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2

3

4

5

Organic pollutants in water are measured by

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DO

COD

Water logging

PH

The largest item which is recycled is

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newspaper

plastic

aluminium

oil

Which if the following will have the same number of molecules at S.T.P?

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280cm³ of CO₂ and 280cm³ of N₂O

11.2dm³ of O₂and 32g of O₂

44g of CO₂and 11.2dm³ of CO

28g of N₂and 5.6dm³ of oxygen

Which gas produces air pollution?

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oxides of sulphur

oxides of carbon

all of these

Gases are good conductor of electricity at

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Low temperature

Low pressure

High pressure

Low temperature and high pressure

Li resembles with Mg, because

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the ratio of their charge to size is nearly the same

both have nearly same size

both are metallic in nature

both are found together in nature

Surface and ground water sources are contaminate by various human activity. which of the following is not a human activity that causes contamination in fresh water?

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rain

live stock waste

oil leaks and spills

disposal of industrial effluents

The hydration energy is the heat evolved when one mole of gaseous ion is dissolved in water. The hydration energy of an ion

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Increases with increase of charge to mass ratio

Decreases with increase of charge to mass ratio

Depends on sign of charge +ve or -ve

Depends upon the solvent

Azeotropic mixture of HCl and water has

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48% HCl

22.2% HCl

36% HCl

20.2% HCl

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Forward

Backward

Already in equilibrium

K_cis never less

Acetamide is

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Highly acidic

Highly basic

Neutral

amphoteric

Formic Acid is obtained from Red out by:

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Distillation

Crystallization

Filtration

sublimation

Which of the following oxides is peroxide?

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Na₂O₂

MnO₂

BaO

SO₂

A transition metal complex can be recognized by various terms. Which is not the proper term

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Central metal ion

Coordination number

Ligand

Geometry of complex

Which of the following is an ortho-para directing group

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Objects of the size of an atom can be observed in

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An electron microscope

An x-ray spectrum

Atomic absorption spectrum

A visible spectrum

Permonosulphuric acid is known as

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Marshall's acid

Carlo's acid

Sulphuric acid

None of these

The best buffer is prepared when molar concentrations of the salt and acid are equal, then its pH and pKa value are related

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pH = pKa

pH < pKa

pH > pKa

pH x pKa = 14

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