Download App

The s-block Elements — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThe s-block Elements2 Marks
Question
Find out the oxidation state of sodium in $\mathrm{Na}_2 \mathrm{O}_2$.
✓

Answer

Let the oxidation state of Na be x. The oxidation state of oxygen, in case of peroxides, is –1.
Therefore,
2(x) + 2(-1) = 0
2x - 2 = 0
2x = 2
x = +1
Therefore, the oxidation sate of sodium is +1

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from The s-block Elements→The s-block Elements — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

The enthalpy of formation of carbon monoxide and steam are -110.5 and -243.0 kJ respectively. Calculate the heat of the reaction when steam is passed over coke as $\mathrm{C}(\mathrm{s})+\mathrm{H}_2 \mathrm{O}(\mathrm{g}) \rightarrow \mathrm{CO}(\mathrm{g})+\mathrm{H}_2(\mathrm{~g})$.
→
Name the organic products of the reaction of but-2-ene with each of the following reagents and write a balanced equation for each reaction.
  1. Hydrogen bromide.
  2. Bromine dissolved in tetrachloromethane.
→
Calculate the pH of the resultant mixtures:
10 mL of $0.1 \mathrm{M} \mathrm{~H}_2 \mathrm{SO}_4+10 \mathrm{~mL}$ of 0.1 M KOH
→
Like CO, why its analog of SiO is not stable?
→
The species: $\text{H}_2\text{O}$, $\text{HCO}_3^-,$ $\text{HSO}_4^-$ and $\text{NH}_3$ can act both as Brönsted acids and bases. For each case give the corresponding conjugate acid and base.
→
Calculate the wavelength of the radiation which would cause photochemical dissociation of a chlorine molecule.
The bond dissociation energy $Cl - Cl$ of bond is $245 kJ mol ^{-1}$.
→
Justify that the following reactions are redox reactions:$4 \mathrm{BCl}_{3(\mathrm{~g})}+3 \mathrm{LiAlH}_{4(\mathrm{~s})} \rightarrow 2 \mathrm{~B}_2 \mathrm{H}_{6(\mathrm{~g})}+3 \mathrm{LiCl}_{(\mathrm{s})}+3 \mathrm{AlCl}_{3(\mathrm{~s})}$
→
Define oxidaiton number.
→
In a reaction
$\mathrm{A}+\mathrm{B}_2 \rightarrow \mathrm{AB}_2$
Identify the limiting reagent, if any, in the following reaction mixtures. $2 \mathrm{~mol} \mathrm{~A}+3 \mathrm{~mol} \mathrm{~B}$.
→
Why are alkali metals always univalent? Why are they good reducing agents?
→