Tag: simple oxides

Questions Related to simple oxides

The species that do not contain peroxide ions is :

chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. $PbO _2$

  2. $H _2O _2$

  3. $SrO _2$

  4. $BaO _2$

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Correct Option: A
Explanation:

Only true peroxides which have -O-O- bond give hydrogen peroxide with dilute acids.
$PbO _2$ does not give hydrogen peroxide with dilute acids. So it is not a true peroxide.

Hence option A is correct.

Which one of the following statement is true?

chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. According to the modern atomic theory, atoms of the same element may have different atomic weights

  2. Reduction is the process of electron loss

  3. Acidic oxide are the non-metallic oxides

  4. The solubility of all substances decreases with increase in temperature

Show answer
Correct Option: C
Explanation:

Acidic oxides are the oxides which reacts with water to form an acid. Acidic are non- metallic oxides. Some of the examples are ${ SO } _{ 3 }$ forms sulphuric acid and ${ CO } _{ 2 }$ forms carbonic acid. 

So, correct answer is option C.

Which choice or choices demonstrate amphoterism?
i. $HCl + H _{2}O \rightarrow H _{3}O^{+} + Cl^{-}$ and $H _{2}O + N _{3} \rightarrow OH^{-} + NH _{4}^{-}$
ii. $HS^{-} + HCl \rightarrow Cl^{-} + H _{2}S$ and $HS^{-} + NH _{3} \rightarrow NH _{4}^{+} + S^{2-}$
iii. $HCl + NaOH \rightarrow NaCl + H _{2}O$ and $NaCl + H _{2}O \rightarrow HCl + NaOH$

chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. i only

  2. ii only

  3. iii only

  4. i and ii only

  5. i and iii only

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Correct Option: D
Explanation:

Amphoteric compound or ion is a molecule that cn act as both acid as well as base.

In the first reaction, $H _2O$ acts as both acid and base.It accepts proton and loses proton. Hence. it shows amphoterism.
In the second reaction, ${ HS }^{ - }$ does the same thing.
It accepts and loses proton. 
Hence, both shows amphoterism.

Which one among the following can be classified as amphoteric?

chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. $Na _3PO _4$

  2. HCl

  3. NaOH

  4. $HSO^- _4$

  5. $C _2O^{2-} _4$

Show answer
Correct Option: D
Explanation:

$\displaystyle HSO^- _4$ can be classified as amphoteric. It can donate a proton and act as an acid. At the same time, it can accept a proton and act as a base.
$\displaystyle HSO^- _4 \rightarrow H^+ + SO _4^{2-}$
$\displaystyle HSO^- _4 + H^+ \rightarrow H _2SO _4$

Amphoteric species is:
chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. $Na _3PO _4$

  2. $HSO _4^-$

  3. $KOH$

  4. $HNO _3$

  5. $C _2O^{2-} _4$

Show answer
Correct Option: B
Explanation:

Amphoteric specie is $\displaystyle HSO _4^-$.
It reacts with acid as well as base.
$\displaystyle HSO _4^- + H^+ \rightarrow H _2SO _4$
$\displaystyle HSO _4^-+ OH^- \rightarrow SO _4^{2-} + H _2O$

Which of the following is not a neutral oxide?

chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. $CO$

  2. $N _2O$

  3. $H _2O$

  4. $SO _2$

Show answer
Correct Option: D
Explanation:

Sodium sulphite is formed by passing sulphur dioxide gas through the solution of sodium hydroxide because sulphur dioxide is an acidic oxide.

Which of the following is a neutral oxide?

chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. $NO$

  2. $NO _2$

  3. $N _2O _3$

  4. $N _2O _5$

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Correct Option: A

Which of the following constitutes a set amphoteric species.?

chemistry p-block elements oxides of elements simple oxides oxygen

  1. $H _3O^+, H _2PO^- _4, HCO^- _3$

  2. $H _2O, HPO^{2-} _4, H _2PO^- _2$

  3. $H _2O, H _2PO^- _3, HPO^{2-} _4$

  4. $HC _2O^- _4, H _2PO^- _4, SO^{2-} _4$

Show answer
Correct Option: C

Which of the following oxides is nuetral?

chemistry p-block elements oxides of elements simple oxides oxygen

  1. CO

  2. $SnO _2$

  3. ZnO

  4. $SiO _2$

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Correct Option: A
Explanation:
  • Neutral oxides show neither basic nor acidic properties and hence do not form salts when reacted with acids or bases.
  • Carbon and oxygen together have a total of 10 valence electrons in carbon monoxide. To satisfy the octet rule for the carbon, the two atoms form a triple bond, with six shared electrons in three bonding molecular orbitals, rather than the usual double bond found in organic carbonyl compounds. Since four of the shared electrons come from the oxygen atom and only two from carbon, one bonding orbital is occupied by two electrons from oxygen, forming a dative or dipolar bond. This causes a $C\leftarrow O$ polarization of the molecule, with a small negative charge on carbon and a small positive charge on oxygen. Overall the molecule is neutral.
  • Hence option A is correct answer.

Which one of the following is an amphoteric oxide?



chemistry chemistry of non-metals oxides of elements simple oxides oxygen

  1. $MnO _{2}$

  2. $ZnO$

  3. $CaO$

  4. $CO _{2}$

Show answer
Correct Option: B
Explanation:

ZnO is amphoteric because it can act with acid as well as base.
$ZnO + NaOH \rightarrow Na _2ZnO _2$
$ZnO+HCl \rightarrow ZnCl _2$