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JEE Main 20202 SeptemberMorning Shift
Exam
JEE Main
Year
2020
Date
2 September
Shift
Morning Shift
Subject
Chemistry
Chapter
p Block Elements (Group 13 & 14)

JEE Main 2020 · 2 September · Morning Shift · Chemistry · p Block Elements (Group 13 & 14)

On heating compound (A) gives a gas (B) which is constituent of...

On heating compound (A)\left(A\right) gives a gas (B)\left(B\right) which is constituent of air. This gas when treated with H2{H}_{2} in the presence of a catalyst gives another gas (C)\left(C\right) which is basic in nature. (A)\left(A\right) should not be :

Options

  1. ANaN3{NaN}_{3}
  2. BPb{\left({NO}_{3}\right)}_{2}
  3. C(NH4)2Cr2O7{\left({NH}_{4}\right)}_{2}{Cr}_{2}{O}_{7}
  4. DNH4NO2{NH}_{4}{NO}_{2}

Correct answer

B. Pb{\left({NO}_{3}\right)}_{2}

Step-by-step solution

Pb(NO3)2⟶ΔPbO+2NO2Pb{\left({NO}_{3}\right)}_{2}\overset{\Delta}{⟶}PbO + 2{NO}_{2}

N2{N}_{2} gas is constituent of air and it produces ammonia gas (basic nature) after reacting with H2{H}_{2} gas.

NH4NO2,(NH4)2Cr2O7andNaN3{NH}_{4}{NO}_{2}, ( {NH}_{4}{)}_{2}{Cr}_{2}{O}_{7}and{NaN}_{3}give nitrogen gas on heating but lead nitrate doesn't give nitrogen gas so it will be answer.

NH4NO2⟶ΔN2+2H2O{NH}_{4}{NO}_{2}\overset{\Delta}{⟶}{N}_{2} + 2{H}_{2}O

(NH4)2Cr2O7⟶ΔN2+Cr2O3+H2O{\left({NH}_{4}\right)}_{2}{Cr}_{2}{O}_{7}\overset{\Delta}{⟶}{N}_{2} + {Cr}_{2}{O}_{3} + {H}_{2}O

NaN3⟶300°C3N2+2Na{NaN}_{3}\overset{300 ° C}{⟶}3{N}_{2} + 2Na

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