Question

Long Answer Type Questions:
1. (a) What are metalloids? Name two metalloids.
(b) Classify the following elements in metals, non-metals and metalloids:
Copper, Sulphur, Aluminum, Oxygen, Silicon, Nitrogen, Germanium, Mercury,
Chlorine, Sodium.
2. What happens when sulphur dioxide is dissolved in water? Write the equation for the
reaction.
HOTS:
1 The metal reacts with dilute hydrochloric acid to form a gas Y. The metal X also reacts with sodium hydroxide solution (on heating ) to form the same gas Y. When a lighted matchstick is applied, this gas burns by producing a 'pop' sound.
(a) Name two metals which could behave like X
(b) Name the gas Y.
2. An element reacts with oxygen to form an oxide. An aqueous solution of this oxide turns red litmus paper blue. Is the element a metal or a non-metal. Give reason for
your answer.
3. Consider the following displacement reaction:
(i) Copper sulphate + Iron ----> Iron sulphate +Copper (solution)

(ii) Iron Sulphate + Zinc ----> Zinc sulphate + Iron
(solution)
On the basis of these two displacement reaction, find out which is the most reactive
metal and which is the least reactive metal out of copper iron and zinc.​

Answer 1

Answer:

1.a) metalloids are those elements which shows the the properties of both metal and nonmetal.

two metalloids are boron and silicon

b) copper aluminium Mercury and sodium are metals

sulphur oxygen chlorine and nitrogen are

non metals

silicon and germanium are metalloids

2. When Sulphur dioxide is added to water the water becomes acidic in nature.

HOTS

1.a) Two metals that can be behave like X are sodium and magnesium

b) the gas Y is hydrogen

3. most reactive metal is zinc

moderate reactive metal is iron

least reactive metal is copper