Question # 1

ΔH_{Neutralisation} is always

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Positive

Negative

Zero

Positive or negative

At room temperature formaldehyde is

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Gas

Liquid

Solid

None of the above

Which of the following is acidic?

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SO₃

N₂O

BeO

HgO

A solution of sodium sulphate was electrolysed using some inert electrodes.The products at the electrodes are

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O₂, H₂

O₂, Na

O₂, SO₂

O₂, S₂O²-₈

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

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N

Li

P

Na

Setting of plaster of paris involves

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Oxidation with atmospheric oxygen

Combination with atmosphere CO₂

Dehydration

Hydration to yield another hydrate.

Portland cement is manufactured by using

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Limestone,clay and sand

Limestone,gypsum and sand

Limestone,gypsum and alumina

Limestone,clay and gypsum

The rate of a reaction can be increased in general by all the factors except by

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Using a catalyst

Increasing temperature

Increasing the activation energy

Increasing the conc. of reactants

Hess's law deals with

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Changes in heat or reaction

Rate of reaction

Equilibrium constant

Influence of pressure on volume of a gas

Which of the following belongs to the halogen family?

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Francium

Polonium

Radium

Astatine

The IUPAC name of the compound having the formula (CH3) 3 C - CH = CH2 is

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1, 1 -Dimethyl-3-butene

1,1,1-Trimethyl-3-propene

3,3,-Dimethyl-1-butene

3,3,3-Trimethyl-1-propene

Sea weeds are important source of

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Iron

Chlorine

Iodine

Bromine

Which of the following process is used to separate insoluble particles from liquids?

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Seperation

Filtration

Crystallization

Condensation

Inert pair effect plays an important role in case of

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F

Al

Si

Tl

The unit rate of a reaction can be increased in general by all the factors except by

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Using a catalyst

Increasing temperature

Increasing the activation energy

Increasing the conc. of reactants

BiCl₃on hydrolysis forms a white precipitate of

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Bismuthio acid

Bismuth oxychloride

Bismuth pentachloride

Bismuth hydroxide.

Which of the following has linear shape?

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SP

SP²

SP³

None of the above

The acid used in lead storage cells is

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Phosphoric acid

Nitric acid

Sulphuric acid

Hydrochloric acid

Carbon atom holding halogen in aryl halides is

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sp²-hybridesed

sp³-hybridesed

sp-hybridesed

sp³d-hybridesed

Heating a micture of sodium benzoate and soda lime gives

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Benzene

Methane

Sodium benzoate

Calcium benzoate

Which one of the following elements occurs free in nature?

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N

P

As

Sb

Which of the following with aqueous KOH will give acetaldehyde?

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1, 2-Dichloroethane

1, 1-Dichloroethane

Chloroacetic acid

Ethyl chloride

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