Tag: oxides of elements

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

(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:

  1. $NO _2$
  2. $NO$
  3. $N _2O _5$
  4. $N _2O$
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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 _______.

  1. a,b,c

  2. b,e,c

  3. a,e,c

  4. e,c,a
Reveal answer Fill a bubble to check yourself
C Correct answer
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: $Al _2O _3$

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

Which of the following is not amphoteric ?

  1. $HS{O _4}$
  2. ${H _2}P{O _2}$
  3. ${H _2}O$

  4. non of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

HSO4- and H2PO2- are amphoteric. H2O is amphoteric. Since all options listed are amphoteric, the correct choice is that none of them are 'not amphoteric'.

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

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

  1. ${\text{Na}}{{\text{O}} _{\text{2}}}\,\,\,$
  2. ${\text{Ba}}{{\text{O}} _{\text{2}}}\,\,\,$
  3. ${\text{Rb}}{{\text{O}} _{\text{2}}}\,\,\,$
  4. ${\text{R}}{{\text{O}} _{\text{2}}}\,\,\,$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The superoxide ion is O2(-). RbO2 is rubidium superoxide, which contains the O2(-) ion. BaO2 is a peroxide (O2(2-)), and NaO2 is a superoxide, but RbO2 is the classic example often cited in this context.

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

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$

  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)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Matching the oxide types: N2O is a neutral oxide (iv), BaO is a strong basic oxide (i), As2O3 is an amphoteric/weakly acidic oxide (commonly classed as amphoteric or intermediate, matching ii here), and Cl2O7 is a strong acidic oxide (iii). This correctly aligns with option C.

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

Amphoteric oxides are:

  1. $SnO, SnO _2$
  2. $GeO, GeO _2$

  3. both (a) and (b)

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
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