Question

q. 6. nitrogen gas reacts w h ydrogen gas to form ammonia gas.
ans.
q. 7. calcium oxide powder when added to water, solid calcium hydroxide is obtained.
ans.

Explanation:

Q.6

Step1: Identify reactants and products

Reactants: Nitrogen gas ($\ce{N2}$) and Hydrogen gas ($\ce{H2}$); Product: Ammonia gas ($\ce{NH3}$)

Step2: Write unbalanced equation

$\ce{N2 + H2 -> NH3}$

Step3: Balance the equation

Balance N: $\ce{N2 + H2 -> 2NH3}$; Balance H: $\ce{N2 + 3H2 -> 2NH3}$

Step1: Identify reactants and products

Reactants: Calcium Oxide ($\ce{CaO}$) and Water ($\ce{H2O}$); Product: Calcium Hydroxide ($\ce{Ca(OH)2}$)

Step2: Write unbalanced equation

$\ce{CaO + H2O -> Ca(OH)2}$

Step3: Check and balance (already balanced)

Answer:

$\ce{N2 + 3H2 -> 2NH3}$

Q.7