Chemical Reactions and Equation-Chemical Equations (CBSE (Central Board of Secondary Education- Board Exam) Class-10 Science): Questions 33 - 39 of 42

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Question number: 33

» Chemical Reactions and Equation » Chemical Equations » Writing a Chemical Equation

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

One Liner Question▾

Write in Brief

What does the symbol (g) used with water represents?

Question number: 34

» 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: 35

» 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: 36

» 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

Question number: 37

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

MCQ▾

Question

A shorthand representation of a chemical reaction in terms of symbols and formulae of the substance involved is called as:

Choices

Choice (4) Response

a.

Balanced chemical equation

b.

Skeleton equation

c.

Chemical reaction

d.

None of the above

Question number: 38

» Chemical Reactions and Equation » Chemical Equations » Balanced Chemical Equations

MCQ▾

Question

Hit and Trial method is also called as:

Choices

Choice (4) Response

a.

Trial- and – error method

b.

Material or mass balance

c.

Inspection Method

d.

All a. , b. and c. are correct

Question number: 39

» Chemical Reactions and Equation » Chemical Equations » Balanced Chemical Equations

MCQ▾

Question

Balancing of a chemical equation is necessary because:

Choices

Choice (4) Response

a.

No atom is lost or gained during the chemical reaction

b.

No matter is lost or gained during chemical reaction

c.

Both a. and b. are correct

d.

Question does not provide sufficient data or is vague

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