Tag: chemistry

Questions Related to chemistry

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

Show answer
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

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

Show answer
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