Tag: oxygen

Questions Related to oxygen

Which of the following compounds is amphoteric?

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

  1. $Cr{(OH)} _{2}$

  2. $Fe{(OH)} _{2}$

  3. $Cr{(OH)} _{3}$

  4. $Fe{(OH)} _{3}$

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Correct Option: C
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.

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

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

  1. $SO _2,\, P _2O _5,\, CO$

  2. $BaO,\, Al _2O _3,\, SiO _2$

  3. $CaO,\, SiO _2,\, Al _2O _3$

  4. $Al _2O _3.\, CO _2,\, CO$

Show answer
Correct Option: B
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:
$Al _2O _3$

Which of the following set contains only amphoteric oxides?

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

  1. $ZnO,\, PbO,\, SnO,\,Al _2O _3$

  2. $ZnO,\, BaO,\, SO _2, CO$

  3. $CO,\, PbO,\, BaO _2,\, SO _2$

  4. $P _2O _5,\, N _2O _5,\, CI _2O _7,\, BaO$

Show answer
Correct Option: A
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.

Which of the following is amphoteric in nature?

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

  1. $HClO _4$

  2. $NaOH$

  3. $Zn(OH) _2$

  4. None of these

Show answer
Correct Option: C
Explanation:

$Zn(OH) _2$   amphoteric in nature
$HClO _4$      strong acid
$NaOH$         strong base

A basic oxide will be formed by the element:

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

  1. $K$

  2. $S$

  3. $P$

  4. $Kr$

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Correct Option: A
Explanation:

Basic oxides will be formed by metals. Potassium is a metal and it forms basic oxides.

Which of the following oxides react with both $HCl$ and $NaOH$?

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

  1. $CaO$

  2. ${N} _{2}{O} _{5}$

  3. ${CO} _{2}$

  4. $ZnO$

Show answer
Correct Option: D

The metals which can produce amphoteric oxides are:

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

  1. sodium and aluminium

  2. zinc and potassium

  3. calcium and sodium

  4. aluminium and zinc

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Correct Option: D
Explanation:

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

Out of the following oxides, the amphoteric oxide is:

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

  1. $Fe _2O _3$

  2. $Al _2O _3$

  3. $P _2O _5$

  4. $N _2O$

Show answer
Correct Option: B
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.

One of the following is not a neutral oxide. This is:

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

  1. $CO$

  2. $H _2O$

  3. $N _2O$

  4. $Na _2O$

Show answer
Correct Option: D
Explanation:

Sodium is a metal and metal oxides are basic in nature. So, $Na _{2} O$ is a basic oxide. It is not neutral oxide.

Which oxide is neutral state?

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

  1. $CO _2$

  2. $SO _2$

  3. $P _2O _5$

  4. $N _2O$

Show answer
Correct Option: D
Explanation:

${ N } _{ 2 }O,CO,{ H } _{ 2 }O$ these are some samples of neutral oxides.