Question

Explain the following:

(a) Metals like Na, Ca and Mg are never found in the free state in nature.
(b) Solder is used for welding electrical circuits.
(c) Silver ornaments turn blackish after some time.
(d) Gold is used to make jewellery.
(e) Gallium will melt if you keep it on your palm.

Answer 1

Answer✍️✍️✍️

*️⃣A. they are corresive in nature .they are most reactive.

*️⃣B. it is used in a circuit it is alloy tin.

*️⃣C.they are black in colour .

*️⃣D. they are shiny in nature.

*️⃣E they are melt in palm due to high temperature.

Answer 2

a) because the metals in activity series are highly reactive therefore they are not found in free state
b)solder an alloy tin and lead has low melting point so they are used in welding electrical circuits
c)when silver ornaments are kept open in air the article reacts with sulphur present in air and forms blackish substance called silver sulphide therefore silver ornaments turn black
d)gold doesn't react with cold water,hot water or steam and is less reactive therefore gold ornaments are used to make jewellery
e