Tag: simple oxides

Questions Related to simple oxides

Which of the following are basic oxides? 
$Mn _2O _7$ ,$V _2O _3$, $V _2O _5$, $Cr _2O _3, CrO$ 

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

  1. $Mn _2O _7$ and $V _2O _3$

  2. $V _2O _3$ and $CrO$

  3. $CrO$ and $Cr _2O _3$

  4. $V _2O _5$ and $V _2O _3$

Show answer
Correct Option: B
Explanation:

As metallic character decreases as we move across the period then basicity of oxides increases.

Also, we know oxide in lowest oxidation state of element is more basic. So, in $V _2O _3$ and $CrO$, oxidation state of $V$ and $Cr$ are $+3$ and $+2$ respectively which is lowest among others.

Select the correct option regarding the properties of dioxygen?

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

  1. Dioxygen never reacts with metals.

  2. Dioxygen is diamagnetic in nature.

  3. Combination of dioxygen with other elements is highly exothermic process.

  4. Dioxygen liquefies at 55 K and freezes at 90 K.

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Correct Option: C
Explanation:

Dioxygen reacts with metals and is paramagnetic. It combines with other elements to form oxides where the reaction is highly exothermic.

Which one of the following is an amphoteric oxide?

chemistry p-block elements oxides of elements simple oxides oxygen

  1. $Na _2O$

  2. $SO _2$

  3. $B _2O _3$

  4. $ZnO$

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Correct Option: D
Explanation:

$ZnO$ is an amphoteric oxide. It reacts with both acid and base to produce respective salts. 

A group of acidic oxide is:

chemistry p-block elements oxides of elements simple oxides oxygen

  1. $CrO _{3},Mn _{2}O _{7}$

  2. $ZnO,Al _{2}O _{3}$

  3. $CaO,ZnO$

  4. $Na _{2}O,Al _{2}O _{3}$

Show answer
Correct Option: A
Explanation:

here,${ CrO } _{ 3 }$ are acidic oxides

${ CrO } _{ 3 }+{ H } _{ 2 }O\longrightarrow { H } _{ 2 }{ CrO } _{ 4 }\ { Mn } _{ 2 }{ O } _{ 7 }+{ H } _{ 2 }O\longrightarrow { 2HMnO } _{ 4 }$

Which is most basic oxide of chromium ?

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

  1. $ CrO $

  2. $ CrO _2 $

  3. $ CrO _3 $

  4. $ Cr _2O _3 $

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Correct Option: A

Which of the following oxide can be converted to metal easily ?

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

  1. ZnO

  2. HgO

  3. PbO

  4. $C{u _2}O$

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Correct Option: B

$ZnO+2HCl\longrightarrow  X+{H} _{2}O$
$ZnO+2NaOH\longrightarrow  Y+{H} _{2}O$
Identify $X,Y$ and the nature of $ZnO$ best described by the above reaction

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

  1. $X=Zn{Cl} _{2}$; $Y=NaZn{O} _{2}$; Nature of $ZnO$- Amphoteric

  2. $X=Zn{Cl} _{2}$; $Y={Na} _{2}Zn{O} _{2}$; Nature of $ZnO$- Amphoteric

  3. $X=Zn{Cl} _{2}$; $Y=NaZn{O} _{2}$; Nature of $ZnO$- Acidic

  4. $X=Zn{Cl} _{3}$; $Y=Zn{OH} _{2}$; Nature of $ZnO$- Basic

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Correct Option: B

Which IS BASIC OXIDE

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

  1. $Tl _{2}O _{3}$

  2. $B _{2}O _3$

  3. $Ga _{2}O$

  4. $InO$

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Correct Option: A
Explanation:

As metal oxides are basic and Tl2O3 makes salt and water after reacting with acid. 

An oxide which forms salts when it reacts with both acids and alkali is :

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

  1. acidic oxide

  2. basic oxide

  3. amphoteric oxide

  4. none of the above

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Correct Option: C
Explanation:

An oxide which forms salts when it reacts with both acids and alkali is knwn as amphoteric oxides. $e.g.$ $Al _2O _3$.

Which of the following is an amphoteric oxide?

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

  1. $ MgO $

  2. $ Al _2O _3 $

  3. $ SO _2 $

  4. $ P _2O _5 $

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Correct Option: B