1. Tardigrade
  2. Question
  3. Chemistry
  4. On heating compound (A) gives a gas (B) which is constituent of air. This gas when treated with H 2 in the presence of a catalyst gives another gas (C) which is basic in nature. (A) should not be:

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Q. On heating compound (A) gives a gas (B) which is constituent of air. This gas when treated with $H _{2}$ in the presence of a catalyst gives another gas (C) which is basic in nature. (A) should not be:

JEE MainJEE Main 2020The p-Block Elements - Part2

Solution:

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Basic gas (C) must be ammonia (NH $_{3}$ ). It means (B) gas should be $N _{2}$ which is formed by heating of compound (A).

(1) $\left( NH _{4}\right)_{2} Cr _{2} O _{7} \stackrel{\Delta}{\longrightarrow } N _{2} \uparrow+ Cr _{2} O _{3}+4 H _{2} O \uparrow$

(2) $Pb \left( NO _{3}\right)_{2} \stackrel{\Delta}{\longrightarrow } Pb O +2 NO _{2} \uparrow+\frac{1}{2} O _{2} \uparrow$

(3) $2 NaN _{3} \stackrel{\Delta}{\longrightarrow } 2 Na +3 N _{2} \uparrow$

(4) $NH _{4} NO _{2} \stackrel{\Delta}{\longrightarrow } N _{2} \uparrow+2 H _{2} O \uparrow$

So, (A) should not be $Pb \left( NO _{3}\right)_{2}$