Question

Give reasons :
(a) Copper us used to make hot water tanks and not steal
(b) Gold and silver are used to make jewellery
(c) Sodium, potassium and lithium are stored under oil​

Answer 1

Answer:

Platinum, gold and silver are used to make jewellery because they are noble metals and thus dont react with air & moisture. Sodium, potassium and lithium are stored under oil because they are highly reactive with air/water but unreactive with oil.Copper does not react with cold water, hot water or steam. ... If the hot water tanks are made of steel (an alloy of iron), then iron would react vigorously with the steam formed from hot water.Potassium (K), Sodium (Na) and Lithium (Li) are also very reactive to air and water and need to be stored under oil to prevent them from reacting with gases in the air and water vapour.Platinum Gold and silver are used to make jewellery because of the following reasons. They are highly lustrous metals which are resistant to corrosion. They are highly malleable and ductile so can be transformed into any shape or design.

Explanation:

hope it will surely help you

Answer 2

$\huge\tt\underline\pink{ANSWER :-}$

a.)

✒✒Copper does not react with cold water, hot water, or steam. However, iron reacts with steam. If the hot water tanks are made of steel (an alloy of iron), then iron would react vigorously with the steam formed from hot water. That is why copper is used to make hot water tanks, and not steel.

B.)

✒✒Gold and silver are used to make jewellery because, they are highly lustrous metals which are resistant to corrosion. They are highly malleable and ductile so can be transformed into any shape or design.

C.)

✒✒Sodium, potassium, and lithium are stored under oil because metals like sodium and potassium react so, vigorously with oxygen present in air so, that they catch fire if kept in the open.

Hope it helps you✨

тнαηкѕ❤.