Tag: simple oxides

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Questions Related to simple oxides

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

$Pb{O} _{2}$ oxide is:

  1. basic

  2. acidic

  3. neutral

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

The $Pb{ O } _{ 2 }$ behaves as acidic and basic property so it is called as amphoteric.

When $Pb{ O } _{ 2 }$ dissolved in a strong base $Pb{ O }{ H } _{ 6 }$ is obtained so it is an acidic property.
when $Pb{ O } _{ 2 }$ dissolved in HCl,$PbCl _{ 6 }$ is formed so it is a basic property.
Thus $PbO _{ 2 }$ behaves as amphoteric in nature.

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

Two oxides of a metal contain $50$% and $40$% metal (M) respectively. If the formula of first oxide is $MO _2$, the formula of second oxide will be:

  1. $MO _2$
  2. $MO _3$
  3. $M _2O$
  4. $M _2O _5$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
$\text{Compound } 1\quad\quad\quad\quad 50\% M+50\% O$
$\text{formula}\quad\quad\quad\quad MO _2$
Let atomic weight of metal be $X,$
$\Longrightarrow MO _2:$    $\cfrac{16}{X}=\cfrac{1}{2}$
Hence atomic weight of metal $=32$
$\text{Compound }2:$ $40\% M=\cfrac{40}{32}=1.25=1\\60\%O=\cfrac{60}{16}=3.75=3$
$\therefore$ Formula is $MO _3$.
Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen

Which of the following oxide is an amphoteric oxide?

  1. $Bi _{2}O _{3}$
  2. $N _{2}O _{3}$
  3. $P _{4}O _{10}$
  4. $Sb _{2}O _{3}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Those metal oxides which show basic as well as acidic behavior are known as amphoteric oxide
Here ${ Sb } _{ 2 }{ O } _{ 3 }$ oxide is an amphoteric oxide.
Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen

Two metallic oxides contain $27.6$% and $30$% oxygen respectively. If the formula of the first oxide is ${X} _{3}{O} _{4}$, that of the second will be ?

  1. $XO$
  2. $X{O} _{2}$
  3. ${X} _{2}{O} _{5}$
  4. ${X} _{2}{O} _{3}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Solution:

Given that, formula of first oxide = $\\ { M } _{ 3 }{ O } _{ 4 }$

Let mass of the metal = x


% of metal in  $M _{ 3 }O _{ 4 }$ $=\dfrac { 3x }{ 3x+64 } \times 100$


but as given percentage$ =(100-27.6) = 72.4 %$ $\left( \dfrac { 3x }{ 3x+64 }  \right) \times 100=72.4$ or $x=56$


in 2nd oxide

$oxygen$ $=30%$

so for the metal $=70%$


so the ratio is,


$M:O=\dfrac { 70 }{ 56 } :\dfrac { 30 }{ 161.25 } :1.8752:3$ 


 so the second oxide is,


${ M } _{ 2 }{ O } _{ 3 }$


Hence the answer is

${ M } _{ 2 }{ O } _{ 3 }$.(${ X } _{ 2 }{ O } _{ 3 }$)

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

Two oxides of a metal contain 72.4% and 70% of metal respectively? If formula of 2nd oxide is $ M _{2}O _{3} $, find that of the first ?

  1. MO
  2. $ M _{3}O _{4} $
  3. $ M _{3}O _{2} $
  4. $ MO _{2} $
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For the second oxide M2O3, 70% is metal, so 30% is oxygen. The ratio of moles M:O is (70/M) : (30/16) = 2:3. Solving gives M = 56 (Iron). For the first oxide (72.4% metal), ratio is (72.4/56) : (27.6/16) = 1.29 : 1.725 = 3:4. Thus, M3O4.

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

Which of the following is the most acidic?

  1. ${ P } _{ 2 }{ O } _{ 5}$
  2. ${ N } _{ 2 }{ O } _{ 5 }$
  3. ${ Sb } _{ 2 }{ O } _{ 5 }$
  4. ${ As } _{ 2 }{ O } _{ 5 }$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As the electronegativity value of the element increases. the acidic character of the oxide also increases.

Here among $N,P,SI$ and $As$ the most electronegative is $N$.

Thus the most acidic is $N _2O _5$.

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

The most acidic oxide among the following is:

  1. $Cl _2O _5$
  2. $Cl _2O$
  3. $Cl _2O _3$
  4. $Cl _2O _7$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$Cl _2O _7$ is most acidic because on reacting with water , it gives  most strongest acid than the other three i.e., $HClO _4$ .

So, $Cl _2O _4$ is most acidic 

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

Which of the following statements are not correct ?

  1. All C - O bonds in $CO _3^{2-}$ are equal but not in $H _2CO _3$
  2. All C - O bonds in $HCO _2^-$ are equal but not in $HCO _2H$.
  3. C - O bond length in $HCO _2^-$ is longer than C - O bond length in $CO _3^{2-}$
  4. C - O bond length in $HCO _2^-$ and C - O bond length in $CO _3^{2-}$ are equal
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In HCO2- (formate ion), the C-O bond length is an average due to resonance, but it is generally shorter than a single bond and longer than a double bond. Comparing it to CO3(2-), the bond lengths are similar due to resonance, making statement C incorrect.

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

The type of ions responsible for scum formation are:

  1. oxides

  2. hydroxides

  3. chlorides

  4. carbonates
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The scum is formed when soap is used in hard water and hard water consists of carbonate. For this process $Oxides$ ions responsible for scum formation.

Hence,
The option $(A)$ is correct.

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

Which of the following oxide is least basic?

  1. $CrO$
  2. $Cr _2O _3$
  3. $CrO _3$
  4. $Cr _2O _4$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As the oxidation state of a metal increases, its metallic character decreases and the covalent character of its oxide increases, leading to more acidic behavior. In CrO3, chromium is in the +6 oxidation state, making it acidic rather than basic, and thus it is the least basic among the choices.