Q: 29 (NDA-II/2018)
question_subject:
Science
question_exam:
NDA-II
stats:
0,2,8,2,2,4,2
keywords:
{'nitric oxide': [0, 0, 0, 1], 'reactions': [1, 0, 0, 4], '3cu': [0, 0, 0, 1], 'gas': [9, 1, 9, 27], 'dilute': [0, 0, 0, 4], 'zn': [0, 0, 1, 5], 'products': [1, 3, 4, 8]}
Option 1: 3Cu + 8HNO3 (dilute)
In this reaction, copper (Cu) reacts with dilute nitric acid (HNO3). The balanced equation for this reaction is:
3Cu + 8HNO3 [REPLACEMENT] 3Cu(NO3)2 + 2NO + 4H2O
As we can see from the balanced equation, the reaction produces nitric oxide (NO) gas as one of the products.
Option 2: Cu + 4HNO3 (Conc.)
In this reaction, copper (Cu) reacts with concentrated nitric acid (HNO3). The balanced equation for this reaction is:
Cu + 4HNO3 [REPLACEMENT] Cu(NO3)2 + 2NO2 + 2H2O
The product of this reaction is not nitric oxide (NO) gas, but nitric dioxide (NO2) gas.
Option 3: 4Zn + 1OHNO3 (dilute)
This equation appears to be incorrect. It should be written as:
4Zn + 10HNO3 [REPLACEMENT] 4Zn(NO3)2 + N2O + 5H2O
In this reaction,