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

Which of the following compounds is amphoteric?

  1. $Cr{(OH)} _{2}$
  2. $Fe{(OH)} _{2}$
  3. $Cr{(OH)} _{3}$
  4. $Fe{(OH)} _{3}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$ Cr(OH) _3$ reacts with bases (hydroxide ions) to give $ [Cr(OH) _6]^{3-}$. It also reacts with acids (hydrogen ions) to give $ [Cr(H _2O) _6]^{3+}$ 


Hence,it act as amphoteric dissolve in both acid and base.

Thus,option C is correct.

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

Which of the following set contains oxide in the sequence, basic, amphoteric and acidic respectively?

  1. $SO _2,\, P _2O _5,\, CO$
  2. $BaO,\, Al _2O _3,\, SiO _2$
  3. $CaO,\, SiO _2,\, Al _2O _3$
  4. $Al _2O _3.\, CO _2,\, CO$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Generally Group 1 and Group 2 elements form bases called base anhydrides or basic oxides. Basic oxides are the oxides of metals. If soluble in water, they react with water to produce hydroxides. These metallic oxides are known as basic anhydrides. They react with acids to produce salts
E.g.-$BaO$
Acidic oxides are the oxides of non-metals (Groups 14-17) and these acid anhydrides form acids with water.
$SiO _2$
An amphoteric solution is a substance that can chemically react as either acid or base. For example, when $HSO _4^-$ reacts with water it will make both hydroxide and hydronium ions:
$Al _2O _3$
Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen

Which of the following set contains only amphoteric oxides?

  1. $ZnO,\, PbO,\, SnO,\,Al _2O _3$
  2. $ZnO,\, BaO,\, SO _2, CO$
  3. $CO,\, PbO,\, BaO _2,\, SO _2$
  4. $P _2O _5,\, N _2O _5,\, CI _2O _7,\, BaO$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An amphoteric solution is a substance that can chemically react with either acid or base. For example, when $HSO _4^-$ reacts with water it will make both hydroxide and hydronium ions. Amphoteric oxides are metallic oxides, which show both basic as well as acidic properties. When they react with an acid, they produce salt and water, showing basic properties. While reacting with alkalies they form salt and water showing acidic properties.  A common example of an amphoteric oxide is aluminium oxide, Zinc Oxide, SnO, PbO.

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

The metals which can produce amphoteric oxides are:

  1. sodium and aluminium

  2. zinc and potassium

  3. calcium and sodium

  4. aluminium and zinc
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

'$Al$' and '$Zn$' reacts with both acids and bases. So, these are amphoteric in nature. So, oxides of these elements are amphoteric oxides. 

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

Out of the following oxides, the amphoteric oxide is:

  1. $Fe _2O _3$
  2. $Al _2O _3$
  3. $P _2O _5$
  4. $N _2O$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Aluminium reacts with acids and bases. So, it is amphoteric in nature. The oxide of an amphoteric element is called amphoteric oxide. So, $Al _{2}O _{3} $ is an amphoteric oxide.