Tag: oxygen

Questions Related to oxygen

Which one of these is basic?

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

  1. $ CO _2 $

  2. $ SnO _2$

  3. $ NO _2 $

  4. $ SO _2 $

Show answer
Correct Option: B
Explanation:
All others are nonmetals oxide they are all acidic oxides.

And Sn is an amphoteric both basic and acidic oxide.

Option B is correct.

(1) $N _2 + 2O _2 \leftrightarrow 2NO _2; K _e = 2 \times 10^{-31}$
(2)  $2NO ^+  \leftrightarrow N _2 + O _2;K _e = 2.2 \times 10^{-31}$
(3)  $2N _2O _5 \leftrightarrow 2N _2 + 5O _2 ; K _e = 3.8 \times 10^{-32}$
(4)  $2N _2 + O _2 \leftrightarrow 2N _2O ; K _e = 4 \times 10^{-32}$
From the above data, the most stable oxide is:

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

  1. $NO _2$

  2. $NO$

  3. $N _2O _5$

  4. $N _2O$

Show answer
Correct Option: C
Explanation:

Most stable oxide is that whose  formation const, $K _f$ is largest 

$(1)\ N _2 + 2O _2 \leftrightarrow 2NO _2 $   $K _e = 2 \times 10^{-31}$
                                          $K _f = \sqrt{K _e}$  {$\because$ one mole $NO _2$ must be formed}
                                                $= \sqrt{0.2} \times 10^{-15}$
                                                $\approx 0.44 \times 10^{-15}$
$(2)\ 2NO^+ \leftrightarrow N _2 + O _2 $   $K _e = 2.2 \times 10^{-31}$
                                          $K _f = \dfrac{1}{\sqrt{K _e}} = \dfrac{10^{15}}{\sqrt{0.22}}$
                                                 $\approx 0.13 \times 10^{15}$
$(3)\ 2N _2 O _5 \leftrightarrow 2N _2 + 5O _2$     $K _e = 3.8 \times 10^{-32}$
                                                $K _f = \dfrac{1}{\sqrt{K _e}} \approx 0.512 \times 10^{16}$
$(4)\ 2N _2 + O _2 \leftrightarrow 2N _2O $   $K _e = 4 \times 10^{-32}$
                                          $K _f = \sqrt{K _e} = 2 \times 10^{-16}$
$\therefore N _2O _5$ is most stable.

Which of the following oxides is amphoteric in character?

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

  1. $CaO$

  2. $CO _2$

  3. $SiO _2$

  4. $SnO _2$

Show answer
Correct Option: D
Explanation:

$SnO _2$ shows both acidic and basic properties $\therefore$ it is amphoteric in nature.

Which of the following metals produces acidic oxide ?

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

  1. $Fe$

  2. $Cu$

  3. $Mn$

  4. $N$

Show answer
Correct Option: C
Explanation:

Mn forms acidic oxide $MN _2O _7$ and it is a transtition metal.

$MN _2O _7+H _2O\longrightarrow 2HMNO _4$

Among :   


$a) Na {2}O  \quad  b)MgO \quad c)Al _{2}O _{3}\quad  d)P _{2}O _{5}\quad  e)Cl _{2}O _{7} \quad $  

the most basic, most acidic and amphoteric oxide can be _______.

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

  1. a,b,c

  2. b,e,c

  3. a,e,c

  4. e,c,a

Show answer
Correct Option: C
Explanation:

Metal being electropositive in nature form basic oxide .non metals being electronegative in nature from acidic oxides .


so the extent of acidity and basicity in oxide depends on electropositive and electronegative nature of elements.


most basic oxide: $Na _2O$
most acidic oxide $Cl _2O _7$
amphoteric oxide: $Al _2O _3$

Which of the following is not amphoteric ?

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

  1. $HS{O _4}$

  2. ${H _2}P{O _2}$

  3. ${H _2}O$

  4. non of these

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Correct Option: D

Which of the following are amphiprotic in nature?

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

  1. $OH^-$

  2. $H _2PO^- _2$

  3. $HSO _3^-$

  4. $HF$

Show answer
Correct Option: C

Which of the following oxide having ${{\text{O}} _{\text{2}}}^{{\text{ - 2}}}\,\,\,$

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

  1. ${\text{Na}}{{\text{O}} _{\text{2}}}\,\,\,$

  2. ${\text{Ba}}{{\text{O}} _{\text{2}}}\,\,\,$

  3. ${\text{Rb}}{{\text{O}} _{\text{2}}}\,\,\,$

  4. ${\text{R}}{{\text{O}} _{\text{2}}}\,\,\,$

Show answer
Correct Option: C

Match the following,regarding nature of the oxides
Column-I                                               Column-II
a. ${ N } _{ 2 }O$                         $       (i)Basic$

b. $ BaO$                                       $  (ii)Amphoteric $
            
c. $ { As } _{ 2 }{ O } _{ 3 }$            $     (iii)Acidic$

d. $ { Cl } _{ 2 }{ O } _{ 7 }$           $      (iv) Neutral$

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

  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)

Show answer
Correct Option: B

Amphoteric oxides are:

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

  1. $SnO, SnO _2$

  2. $GeO, GeO _2$

  3. both (a) and (b)

  4. None of these

Show answer
Correct Option: A
Explanation:

 Amphoteric oxide is one that reacts with both acids and bases to form salt and water. Thus,  SnO and SnO2 react with both HCl (an acid) and NaOH (base) to give salt and water.


GeO and GeO2 are not well characterized. It is amphoteric dissolving in acids to form germanium(II) salts and in alkali to form trihydroxy germanates or germinates and the GeO has not reacted both the acid and base so GeO is not an Amphoteric.

So the correct answer is A