CBSE (Central Board of Secondary Education- Board Exam) Class-10 Science: Questions 117 - 123 of 167

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Question number: 117

» Acids, Bases and Salts » Common Characteristics of Acids and Bases » Acid or a Base in a Water Solution

Short Answer Question▾

Write in Short

Write a note on, addition of acids and bases into water. What precautions to be taken and why?

Question number: 118

» Chemical Reactions and Equation » Oxidation Reactions » Corrosion

MCQ▾

Question

Slow destruction of metal due to their interaction with the environment is called as:

Choices

Choice (4) Response

a.

Decomposition

b.

Precipitation

c.

Rancidity

d.

Corrosion

Question number: 119

» Chemical Reactions and Equation » Chemical Equations » Writing Symbols of Physical States

MCQ▾

Question

The chemical reactions in which heat is absorbed are called as:

Choices

Choice (4) Response

a.

Endothermic reactions

b.

Reactions with –Heat term on product side

c.

Both a. and b. are correct

d.

None of the above

Question number: 120

» Acids, Bases and Salts » Salts » Chemicals From Common Salt

MCQ▾

Question

Common salt acts as a raw material for number of chemicals such as:

Choices

Choice (4) Response

a.

Sodium carbonate

AND

Sodium Hydrogen carbonate

b.

Sodium Hydroxide

c.

Bleaching Powder

d.

All a. , b. and c. are correct

Question number: 121

» Chemical Reactions and Equation » Chemical Equations » Writing Symbols of Physical States

MCQ▾

Question

Concentration of the reactants is denoted by the:

Choices

Choice (4) Response

a.

dil. (for dilute)

b.

Conc. (for concentration)

c.

Fast or slow

d.

Both a. and b. are correct

Question number: 122

» Acids, Bases and Salts » Chemical Properties of Acids and Bases » Reaction of Metallic Oxides With Acids

MCQ▾

Question

When dilute Hydrochloric acid added to copper oxide in a beaker:

Choices

Choice (4) Response

a.

Copper oxide dissolves

b.

Colour of solution becomes blue green

c.

Copper II chloride formed in reaction

d.

All a. , b. and c. are correct

Question number: 123

» Chemical Reactions and Equation » Chemical Equations » Writing Symbols of Physical States

MCQ▾

Question

Letters used for giving information regarding the physical states of the reactants and products are:

Choices

Choice (4) Response

a.

S, L, G and Aq

b.

S, l, G and Aq

c.

S, l, g and aq

d.

None of the above

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