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

The species that do not contain peroxide ions is :

  1. $PbO _2$
  2. $H _2O _2$
  3. $SrO _2$
  4. $BaO _2$
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Which one of the following statement is true?

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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 $NaCl + H _{2}O \rightarrow HCl + NaOH$

  1. i only

  2. ii only

  3. iii only

  4. i and ii only

  5. i and iii only
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Which one among the following can be classified as amphoteric?

  1. $Na _3PO _4$

  2. HCl

  3. NaOH
  4. $HSO^- _4$
  5. $C _2O^{2-} _4$
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
$\displaystyle HSO^- _4 \rightarrow H^+ + SO _4^{2-}$
$\displaystyle HSO^- _4 + H^+ \rightarrow H _2SO _4$

Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen
Amphoteric species is:
  1. $Na _3PO _4$
  2. $HSO _4^-$
  3. $KOH$
  4. $HNO _3$
  5. $C _2O^{2-} _4$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

Multiple choice chemistry p-block elements oxides of elements simple oxides oxygen

Which of the following constitutes a set amphoteric species.?

  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. $HC _2O^- _4, H _2PO^- _4, SO^{2-} _4$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Amphoteric species can act as both acids and bases. H2O, H2PO3-, and HPO4(2-) can all donate or accept protons depending on the reaction environment.

Multiple choice chemistry p-block elements oxides of elements simple oxides oxygen

Which of the following oxides is nuetral?

  1. CO
  2. $SnO _2$

  3. ZnO
  4. $SiO _2$
Reveal answer Fill a bubble to check yourself
A Correct answer
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.