Tag: chemistry of non-metals

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Questions Related to chemistry of non-metals

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

The pair of amphoteric oxides is: 

  1. $VO,\,C{r _2}{O _3}$
  2. ${V _2}{O _5},\,C{r _2}{O _3}$
  3. $V{O _2},\,C{r _2}{O _3}$
  4. ${V _2}{O _5},\,Cr{O _3}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
An amphoteric compound is a molecule or ion that can react both as an acid and as a base. Many metals (such as copper, zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. 

Amphoterism depends on the oxidation states of the oxide. Al2O3 is an example of an amphoteric oxide.

 V2O5 and Cr2O3 are amphoteric oxides because both react with alkalies as well as acids.

So, option B is correct
Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen

Which of the following oxide is most acidic? 

  1. $Na _2O$
  2. $MgO$
  3. $SiO _2$
  4. $Cl _2O _7$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$Na _2O$ , MgO are basic oxides.

$Cl _2O _7$  has highest acidity because it is an oxide of non metal .
Non metallic oxides are acidic 
This oxide reacts with water to give $HClO _4$ i,e,. strong acid.
So, 

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

The order in which the following oxides are arranged to decreasing basic nature is $Al _2O _3$<$MgO$<$CuO$<$Na _2O$

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Oxides can be called as binary compounds formed by the reaction of oxygen with other elements.  Oxides are classified as acidic, basic, amphoteric or neutral.  An oxide is a compound that contains at least one oxygen atom and one other element in its chemical formula.  Oxide is a dianion of oxygen.  Examples of oxides are CaO, BaO, ZnO etc.

Na2O, MgO, Al2O3, CuO is the decreasing order of basic nature.

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

An element $X$ which occurs in the second period has an outer electronic structure $s^{2}p^{2}$. The formula and acid-base character of its oxide, respectively are,

  1. $XO _{3}$, basic
  2. $X _{2}O _{3}$, basic
  3. $X _{2}O _{3}$, amphoteric
  4. $XO _{2}$, acidic
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The outer electronic configuration given is $ns^2np^2$. It is the configuration of the Carbon family. So we know that non-metal oxides are acidic and have general formula $XO _2$.
Option D is correct.
Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen

The correct increasing order of acidic strength for the following oxides ${P} _{2}{O} _{3},{N} _{2}{O} _{3},{SO} _{3}$ is

  1. ${P} _{2}{O} _{5}< {N} _{2}{O} _{5}< {SO} _{3}$
  2. ${P} _{2}{O} _{5}< {SO} _{3}< {N} _{2}{O} _{5}$
  3. $ {SO} _{3}< {P} _{2}{O} _{5}< {N} _{2}{O} _{5}$
  4. ${N} _{2}{O} _{5}< {P} _{2}{O} _{5}< {SO} _{3}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Acidic strength increases with oxidation state: P2O5 (P in +5), N2O5 (N in +5), SO3 (S in +6). Higher oxidation states attract electron density more strongly, making oxides more acidic. Order: P2O5 < N2O5 < SO3.

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

Which of the oxide gives two oxyacid in water ?

  1. ${N _2}{O _3}$
  2. $NO$
  3. $N{O _2}$
  4. ${P _4}{O _{10}}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Oxyacid, any oxygen-containing acid. Most covalent nonmetallic oxides react with water to form acidic oxides; that is, they react with water to form oxyacids that yield hydronium ions (H3O+) in solution. There are some exceptions, such as carbon dioxide, CO, nitrous oxide, N2O, and nitric oxide, NO.

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

Which one of the following is normal oxide?

  1. $K{O _2}$
  2. $Ba{O _2}$
  3. $Si{O _2}$
  4. $Cs{O _2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A normal oxide contains the O(2-) ion. SiO2 is a covalent network solid that behaves as a normal acidic oxide. KO2 and CsO2 are superoxides, and BaO2 is a peroxide.