Question

a) Potassium reacts with cold water to give a base and a gas which gives a pop sound.

b) Molten Zinc at high temperatures, burn in air to give Zinc oxide.​

Answer 1

Answer:

$Sodium metal is very reactive. It reacts vigorously with oxygen and water. A lot of heat is generated in this reaction. Hence, it is stored in kerosene. To test for the release of hydrogen gas, place a lighted splint over the reacting metal - if it "pops" then hydrogen is present.$

Sodium metal is very reactive. It reacts vigorously with oxygen and water. A lot of heat is generated in this reaction. Hence, it is stored in kerosene. To test for the release of hydrogen gas, place a lighted splint over the reacting metal - if it "pops" then hydrogen is present.

Explanation:

I hope it helps u ☺️✌️✌️(◍•ᴗ•◍)❤

Answer 2

Answer:

1) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

Chemical equation:

2K(s)+2H2O(l)→2KOH(aq)+H2(g)

2) Zinc metal burns in air only on strong heating to form zinc oxide.

zinc+oxygen→ zincoxide

2Zn+O2→2ZnO

hope it helps you....