NSO Level 1- Science Olympiad (SOF) Class 10: Questions 631 - 635 of 986

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Question number: 631

» Chemical Reactions and Equation

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MCQ▾

Question

Figure shown the heated the Washing soda(sodium bicarbonate)

Figure Shown the Heated the Washing Soda (Sodium Bicarbonate)

Heating washing soda (sodium bicarbonate) is showing in figure.

What will happen?

First reaction product is sodium oxide

Second products carbon dioxide gas

The reaction is decomposition

Reactions need heat above degrees Celsius

Choices

Choice (4) Response

a.

(1), (2), (3) and (4)

b.

(1), (2) and (3)

c.

(3), (4)

d.

(2), (3) and (4)

Question number: 632

» Our Environment and Its Management

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MCQ▾

Question

Why should we conserve forest and wild life?

Choices

Choice (4) Response

a.

To protect biodiversity

b.

To continue food chain

c.

To maintain balance

d.

To maintain ecosystem

Question number: 633

» Chemical Reactions and Equation

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MCQ▾

Question

Which of the following statements is incorrect?

Choices

Choice (4) Response

a.

Chemical equation inform us about the symbol and formulae of substances involved in a reaction

b.

Reaction that involves the gain of oxygen or loss of hydrogen is called the Reduction

c.

The chemical reactions in which a more reactive element displaces a less reactive element from a compound are known as displacement reactions

d.

The reactions in which two or more substances combine to form a new substance are called combination reaction

Question number: 634

» Sources of Energy

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MCQ▾

Question

Fossil fuels are usually

Choices

Choice (4) Response

a.

Ethanol

b.

Hydrocarbons

c.

Mercury

d.

Potassium nitrate

Question number: 635

» Acids, Bases and Salts

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MCQ▾

Question

On opening the soda water bottle, the dissolved comes out. Would the pH of the solution increase or decrease as the gas comes out?

Choices

Choice (4) Response

a.

Carbonic acid decreases and pH increases

b.

Carbonic acid increases and pH decreases

c.

Carbonic acid and pH both are decreases

d.

None of the above