Question # 1

Washing clothes at 140 ^oF uses almost the energy as at 140 ^oF wash

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Half

Thrice

Twice

None of the above

What is the mass of 4 moles of hydrogen gas.

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1 g

1.008 g

8.064 g

4.032 g

If reversibe reaction useful for preparing compounds on large scale.

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Yes

No

They are useful only when equilirbium lies far to the left side

They are useful only when equilibrium lies far to the right side

A base is a substance which neutralizes an acid. Which of these substances is not aa base.

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Aqueious ammonia

Calcium oxide

sodium Chloride

Sodium carbonate

Whcih one of the following in as electron deficient molecule.

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NH3

O2

BF3

N2

When we mvoe top to bottom in group, ionization energy.

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Increases

No effet

Decreases

None of these

During the formation of ionic bond heat is.

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Remains same

Absorbed

Released

Both a and b

Which one of the following halongesn has lowest electronetivity

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Iodine

Chlorine

Fluorine

Bromine

Why the gas starts coming out when you open a can of fizzy drink.

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Because gteh solubiliyt of the gas increases

Because the gas is dissolved under pressure hence it comes out when pressur eis decreased

Becaue the gas is insoluble in water

Because the solubility of hte gas decreases at high pressure.

Which is the correct formula of calcium phosphide.

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CaP

Ca₃P₂

CaP₂

Ca₂P₃

In chemical reaction, the substances that combine are called.

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Masses

Materials

Products

Reactants

Transfer of electron between elements result in.

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Coordinate covalent bonding

Ionic bonding

Metallic bonding

Covallent bonding

How many electrons are involved in the formation of signle covalent bond

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One

Two

Three

Four

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Chemistry 9th Class English Medium Online Test MCQs With Answers

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