Page 145 - ICSE Chemistry 8

E. Match the enzyme with its func on.

Enzyme Func on
1. Pepsin (a) Breakdown of starch, fats and proteins into glucose, fa y
acids and amino acids
2. Trypsin and lipase (b) Conversion of maltose into glucose

3. Carbohydrase (c) Fermenta on of glucose in alcohol
4. Maltase (d) Breakdown of proteins into amino acids

5. Zymase (e) Diges on of carbohydrates

F. Choose the correct op on.
1. Which of the following is a photochemical reac on?
(a) Calcina on (b) Roas ng (c) Photosynthesis (d) None of these
2. Which of the following reac ons represents electric decomposi on?

(a) Decomposi on of limestone (b) Decomposi on of sodium chloride
(c) Decomposi on of silver chloride (d) Decomposi on of silver bromide
3. Which of the following reac ons is a neutralisa on reac on?
(a) H SO + 2KOH K SO + 2H O (b) NaCl + AgNO AgCl + NaNO 3
4
2
2
3
2
4
(c) Pb(NO ) + 2KI PbI + 2KNO 3 (d) CaCO CaO + CO 2
2
3 2
3
4. Calamine solu on contains ________________.
(a) sodium hydrogen carbonate (b) magnesium hydroxide
(c) hydrochloric acid (d) zinc hydroxide
5. Which of the following metals is the most reac ve metal?
(a) Sodium (b) Potassium
(c) Aluminium (d) Silver
6. Which of the following is an amphoteric oxide?
(a) Magnesium oxide (b) Copper oxide

(c) Potassium oxide (d) Aluminium oxide

SHORT AND PRECISE

A. Show the given text in the form of fl owcharts.

1. Condi ons necessary for chemical reac ons
2. Types of chemical reac ons

3. Classifi ca on of oxides

B. Answer in short.
1. What are chemical reac ons?
2. What happens when zinc granules are added to dilute sulphuric acid? Write a chemical reac on for
the same.

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