Question

Subject - Chemistry
Topic - Hydrogen
Class - 8
_________________________
Write chemical equations for the following:

1. Sodium reacts with water.

2. Steam is passed over red hot iron.

3. Hydrogen reacts with nitrogen in presence of catalyst.

4. Hydrogen reacts with chlorine in sunlight.

5. Lead oxide is treated with hydrogen.

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Correct answer will be marked as Brainliest!
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Answer 1

HI Atlas!

$\large{\underline{\sf { Solution-} }}$

GiveN:-

$\bullet$1. Sodium reacts with water.

$\bullet$2. Steam is passed over red hot iron.

$\bullet$3. Hydrogen reacts with nitrogen in presence of catalyst.

$\bullet$4. Hydrogen reacts with chlorine in sunlight.

$\bullet$5. Lead oxide is treated with hydrogen.

To FinD:-

$\bullet$Chemical equations

AnsweR:-

1. Sodium reacts with water

=> Sodium + Water → Sodium hydroxide + Hydrogen. (A)- 2Na(s) + 2H2O(l) →2NaOH(aq) + H2(g)

2. Steam is passed over red hot iron.

=> $\rm{3Fe + 4H_2O → Fe_3O_4 + 4H_2.}$

3. Hydrogen reacts with nitrogen in presence of catalyst.

=> $\rm{N_2 + 3H_2 + \dfrac{Catalyst}{773 K} \implies 2NH_3}$

4. Hydrogen reacts with chlorine in sunlight.

=> $\rm{H_2+ Cl_2 \dfrac{sunlight}{} → 2Hcl}$

5. Lead oxide is treated with hydrogen.

=> PbO² + 2H² -- Pb + 2H²⁰

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HOPE YOU LIKE MY ANSWER!

Answer 2

$\rule{199pt}{2pt}$

$\boxed{ \rm{Na+H_2O\xrightarrow{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: } NaOH +H_2}}$

$\rm{Na_{(sodium)} \xrightarrow{ \: \: \: \: \: \: \: \: \: \: \: } Metal}$

$\rm{Colour \xrightarrow{}silvery \: white}$

$\rm{H_2O_{}\xrightarrow{}water}$

$\rm{NaOH_{(salt)} \xrightarrow{}Sodium \: hydroxide}$

$\rm{Colour \xrightarrow{}white}$

$\rm{H_2{}_{(gas)} \xrightarrow{}Hydrogen}$

$\rule{199pt}{2pt}$

$\boxed{ \rm{ 3Fe + 4H_{2} O \xrightarrow{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: } Fe _{3} O_{4}  + 4H_ 2}}$

$\rm{3Fe_ {(iron)}\xrightarrow{}3 \: Molecules \: of \: iron}$

$\rm{4H_2O_{}\xrightarrow{}4 \: molecules \: ofwater}$

$\rm{ Fe _{3} O_{4} \xrightarrow{}iron \: oxide}$

$\rm{H_2{}_{(gas)} \xrightarrow{}Hydrogen}$

$\rule{199pt}{2pt}$

$\boxed{ \rm{N_{2} + 3H_2\underset{773K}{\xrightarrow{\text{catalyst}}}2NH_3}}$

$\rm{N_{2}{}_{gas}\xrightarrow{} Nitrogen}$

$\rm{H_2{}_{(gas)} \xrightarrow{}Hydrogen}$

$\rm{2NH_3{}_{(gas) } \xrightarrow{}Ammonia}$

$\rule{199pt}{2pt}$

$\boxed{\rm{H_2+Cl_2 \xrightarrow{sunlight}2HCl}}$

$\rm{H_2{}_{(gas)} \xrightarrow{}Hydrogen}$

$\rm{Cl_2{}_{(gas)} \xrightarrow{} Chlorine}$

$\rm{HCl \xrightarrow{} Hydrochloric \: acid}$

$\rule{199pt}{2pt}$

$\boxed{ \rm{ PbO +H _{2} \xrightarrow{ \: \: \: \: \: \: \: \: \: \: \: \:} }Pb + H_{2}O}$

$\rm{PbO \xrightarrow{}Lead \: oxide}$

$\rm{H_2{}_{(gas)} \xrightarrow{}Hydrogen}$

$\rm{Pb \xrightarrow{}Lead}$

$\rm{H_2O_{}\xrightarrow{}water}$

$\rule{199pt}{2pt}$

• Sodium reacts with water-------Exothermic reaction.
• Steam is passed over red hot iron-------Reversible reaction.
• Hydrogen reacts with nitrogen in presence of catalyst-------Exothermic reaction
• Hydrogen reacts with chlorine in sunlight-------Radical substitution reaction
• Lead oxide is treated with hydrogen-------Redox reaction

$\rule{199pt}{2pt}$

$\rule{300pt}{8pt}$