Question

Which of the following elements form water? *
1 point
i)carbon, oxygen
ii)nitrogen, carbon
iii)hydrogen, nitrogen
iv)oxygen, hydrogen​

Answer 1

Answer:

Which of the following elements form water? *

1 point

i)carbon, oxygen

ii)nitrogen, carbon

iii)hydrogen, nitrogen

iv)oxygen, hydrogen✔️

Explanation:

Water is made up of hydrogen and oxygen, and it exists in solid, liquid, and gaseous states.

Answer 2

Answer:

iv) oxygen, hydrogen

Explanation:

• Two molecules of hydrogen reacts with one molecule of oxygen to form two molecules of water.
• The reaction is direct combination.
• A direct combination reaction is the one in which two or more substances combined together to form a single substance.
• Here, oxygen and hydrogen the combined together to form a single substance, water.

Reaction:

• 2H₂ + O₂ ⇾ 2H₂O

Why other options are wrong?

➤ Carbon burns in oxygen to form a gaseous compound, carbon dioxide.

➤ Nitrogen combines with carbon to form cyanide.

➤ Hydrogen gas combines with nitrogen to form ammonia.

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