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Science Class 8th

401. When _____ is heated at very high temperature CO2 and CaO are formed.

A) Sulpher Oxide

B) Marble

C) Cement

D) Calcium  Carbonate

Answer
D

402. During a chemical reaction heat is ______.

A) Absorbed

B) Released

C) Both A and B

D) None of the above

Answer
C

403. Heat evolved or absorbed during a chemical reaction is called the ______.

A) Specific Heat

B) Heat Capacity

C) Heat of Reaction

D) Total Heat

Answer
C

404. There are ____ types of reaction with respect to the energy changes.

A) Two

B) Three

C) Six

D) Seven


Answer
A

405. Chemical reactions in which heat is released.

A) Endothermic

B) Exothermic

C) Both A  and B

D) None of the above

Answer
B

406. Chemical reactions in which heat is absorbed.

A) Endothermic

B) Exothermic

C) Both A and B

D) None of the above

Answer
A

407. Which of the following occurs at the SUN:

A) Endothermic Reaction

B) Exothermic Reactions

C) Both A and B

D) None of the above

Answer
A

408. Breakdown of glucose inside the body is an _____ reaction.

A) Endothermic

B) Exothermic

Answer
B

409. Rusting of iron is an example of chemical reaction:

A) True

B) False

Answer
A

410. Symbols is the best way to express a chemical reaction:

A) True

B) False

Answer
B

411. What changes occur in the solution of AgNO3 and NaCl in the presence of sunlight.

A) Gas Evolved

B) Heat is produced

C) Precipitate is formed

D) No Change is observed

Answer
D

412. The total energy of the product in an ______ reaction is less than that of the reactant.

A) Exothermic

B) Endothermic

C) Both A and B

D) Addition

Answer
A

413. When Iron rusts, it reacts with:

A) Carbon

B) Oxygen in the Air

C) Nitrogen in Air

D) Chlorine

Answer
B

414. Common Table Salt:

A) Sodium Chloride

B) Calcium Carbonate

C) Magnesium Carbonate

D) None of the above

Answer
A

415. Which of the following is present in vinegar?

A) Lactic Acid

B) Acetic Acid

C) Hydrochloride Acid

D) Citric Acid

Answer
B

416. There are _____ main types of chemical compounds.

A) Two

B) Three

C) Four

D) Five

Answer
B

417. The _____ taste in fruits is due to acids.

A) Salty

B) Sugary

C) Bitter

D) Sour

Answer
D

418. The word acid is derived from a ______ word.

A) English

B) Roman

C) French

D) Latin

Answer
D

419. Alkalis are sweet in taste and rough in touch.

A) True

B) False

Answer
B

420. Salts are formed by the reaction of acids and alkalis.

A) True

B) False

Answer
A
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