Tag: chemistry of non-metals

Quizzes (6) Questions (122)

Questions Related to chemistry of non-metals

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

Which of the following is not a normal oxide?

  1. $\mathrm{N}\mathrm{a} _{2}\mathrm{O}$
  2. $\mathrm{Al} _{2}\mathrm{O} _{3}$
  3. $\mathrm{K}\mathrm{O} _{2}$
  4. $\ \mathrm{M}\mathrm{g}\mathrm{O}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$KO _2 \rightarrow K^+ O _2^-$
Hence, $KO _2$ is a super oxide with $O _2^-$ ion.
$Na _2O, Al _2O _3, M _gO$ are normal oxides with $O^{2-}$ ion.

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

Which of the following elements forms amphoteric oxides?

  1. Beryllium

  2. Aluminium

  3. Zinc

  4. All
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An amphoteric species is a molecule or ion that can react as an acid as well as base. The word amphoteric means both. Many metals such as copper, zinc, tin, lead, aluminium and beryllium form amphoteric oxides or hydroxides.

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

Metal oxide which show basic as well as acidic behaviour are known as:

  1. neutral oxide

  2. amphoteric oxide

  3. metalloid oxide

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Metal oxides which shows basic as well as acidic behaviour as known as amphoteric oxides. Thus aluminium metal and zinc metal form amphoteric oxides.

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

Which of the following oxide is thermally least stable?

  1. $CaO$
  2. $Al _2O _3$
  3. $Fe _2O _3$
  4. $Ag _2O$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The melting points and thermal stability of the oxides are determined by the nature of the distribution of valent electrons from the components over localized and nonlocalized ones and by the probability of the formation of stable electron configurations of transition metal and oxygen atoms. The drop in statistical weight of stable configurations and increase in proportion of nonlocalized electrons results in a drop in melting point and thermal stability of the oxides.

Calcium oxide is thermally least stable as it reacts exothermically with water producing hydroxide.
$CaO +H _2O \rightleftharpoons Ca(OH) _2$

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

Match the following, regarding nature of the oxides.

Column -I Column-II
a. $N _2O$ (i) Basic
b. BaO (ii) Amphoteric
c. $As _2O _3$ (iii) Acidic
d. $Cl _2O _7$ (iv) Neutral

  1. a(ii), b(i), c(iii), d(iv)

  2. a(iv), b(i), c(iii), d(ii)

  3. a(iv), b(i), c(ii), d(iii)

  4. a(ii), b(i), c(iv), d(iii)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

(A) $N _2O\longrightarrow$ (iv) Neutral as it neither shows properties of a base nor acid.

(B) $BaO\longrightarrow$ (i) Basic; Metallic oxides are basic oxides.
(C) $As _2O _3\longrightarrow$ (ii) Amphoteric as it can act both as a base and an acid.
(D) $Cl _2O _7\longrightarrow$ (iii) Acidic as non-metallic oxides are acidic in nature.

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

A light metal M is a good conductor of electricity. It forms a layer when exposed to air, which is an amphoteric oxide of the formula $M _2O _3$. Identify M.

  1. Ca

  2. Al

  3. Mg

  4. Ba
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Here, only $Al$ forms amphoteric oxide of formula $Al _2O _3$.

It forms protective layer of $Al _2O _3$ when exposed to air.

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

$Na _2O$, $MgO$, $Al _2O _3$ and $SiO _2$ have heat of formation equal to $-416,\ -602,\ -1676$ and $-911$ $ kJ mol^{-1}$ respectively. The most stable oxide is:

  1. $Na _2O$
  2. $MgO$
  3. $Al _2O _3$
  4. $SiO _2$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
$(B)$ A smaller higher charged ion will be closer to the oxide ions $(O^{2-})$, which means the thermal stability of $MgO$ is more or it takes more energy to break the crystal structure of $MgO$
Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen

Which one of the following oxides in neutral?

  1. $SiO _7$
  2. $SnO _2$
  3. $ZnO$
  4. $CO$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The correct answer is $(B),SnO _2$ 

Because its react with acids as well as with bases to form corresponding salt,
$Sn{O _2} + 2{H _2}S{O _4}\left( {conc.} \right) \to Sn{\left( {S{O _4}} \right) _2} + 2{H _2}O$
and $Sn{\left( {S{O _4}} \right) _2} + 2NaOH \to N{a _2}Sn{O _3} + {H _2}O$ 

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

Acidic oxides react with water to give ________.

  1. base

  2. acids

  3. salt

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Acids are formed by reacting acidic oxides with water. $CO _2$ is acidic oxide. On reacting it with water, $H _2CO _3$, which is an acid forms.
$CO _2 + H _2O \rightarrow H _2CO _3$
                                 $acid$