Question

in
proteins
E8 Exer
mpler
elp to
le,
2.
d.
into
a
A. Tick the most appropriate answer.
1. Which of the following is a correct word equation?
carbon → oxygen + carbon dioxide
b. magnesium oxide + oxygen magnesium
carbon + oxygen → carbon dioxide
none of these
2. What changes happen when chemical reactions occur?
evolution of a gas
b. change in colour
a formation of a precipitate
d. all of these
3. Which gas is produced when copper(11) carbonate is heated?
b. oxygen
c. carbon dioxide
d. none of these
4. When quick lime is added to water, which of the following does not happen?
b. Light is produced.
d. Carbon dioxide is produced.
5. When potassium iodide and lead acetate solutions are mixed, what colour is the precipitate
a. hydrogen
a.
Heat is evolved.
Heat is absorbed.
formed?
a. white
b. green
d. red
C. yellow
6. When hydrogen gas is bubbled through molten sulphur, which gas is formed?
b. hydrogen sulphide C. sulphur dioxide
a. carbon dioxide
d. nitrogen​

Answer 1

Answer:

1 is a and 2 is d and 3 is c and 4 is d and 5 is a and 6 is d