Consider the following reactions-i Cu -HNO3dil-ii Cu -HNO3conc-iii Zn -HNO320-iv Zn -HNO360- Total number of reactions in which N2 is released is-are-

The corresponding reactions are: 3Cu+dilute8HNO_3→ 2NO+3Cu(NO_3)_2+4H_2O Cu+Conc.4HNO_3→ 2NO_2+Cu(NO_3)_2+2H_2O 4Zn+10HNO_3 (20%)→ 4Zn(NO_3)_2+N_2O+5H_2O Zn+4HN ...

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Byju's Answer

Standard XII

Chemistry

Hardness of Water and Treatment

Consider the ...

Question

Consider the following reactions:
$(i) C u + H N O_{3} (d i l .) \to$
$(i i) C u + H N O_{3} (c o n c .) \to$
$(i i i) Z n + H N O_{3} (20 %) \to$
$(i v) Z n + H N O_{3} (60 %) \to$
Total number of reactions in which $N_{2}$ is released is/are:

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Solution

The corresponding reactions are:
$3 C u + 8 H N O_{3} dilute \to 2 N O + 3 C u (N O_{3})_{2} + 4 H_{2} O$
$C u + 4 H N O_{3} Conc. \to 2 N O_{2} + C u (N O_{3})_{2} + 2 H_{2} O$
$4 Z n + 10 H N O_{3} (20 %) \to 4 Z n (N O_{3})_{2} + N_{2} O + 5 H_{2} O$
$Z n + 4 H N O_{3} (60 %) \to Z n (N O_{3})_{2} + 2 N O_{2} + 2 H_{2} O$
So, total number of reactions in which $N_{2}$ is released is $0$ .

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Similar questions

Consider the following reaction which of the following statement is true for this cell reaction.

(Zn + Cu²⁺ → Zn²⁺ + Cu)

E_{1}, E_{2}, E_{3}

are the emf values of the three galvanic cells respectively.
(i)

Z n | Z n_{1 M}^{2 +} | | C u_{0.1 M}^{2 +} | C u

(ii)

Z n | Z n_{1 M}^{2 +} | | C u_{1 M}^{2 +} | C u

(iii)

Z n | Z n_{0.1 M}^{2 +} | | C u_{1 M}^{2 +} | C u

Which one of the following is true?

Below given are emf of three galvanic cells, represented by $E_{1}$ , $E_{2}$ and $E_{3}$ . Which of the following is true?

I. $Z n | Z n^{2 +} (1 M) | | C u^{2 +} (1 M) | C u$

II. $Z n | Z n^{2 +} (0.1 M) | | C u^{2 +} (1 M) | C u$

III. $Z n | Z n^{2 +} (1 M) | | C u^{2 +} (0.1 M) | C u$

Q. The emf of the following three galvanic cells are represented by

E_{1}, E_{2}

and

E_{3}

respectively. Which of the following is correct?

(i)

Z n | Z n^{2 +} (1 M) | | C u^{2 +} (1 M) | C u

(ii)

Z n | Z n^{2 +} (0.1 M) | | C u^{2 +} (1 M) | C u

(iii)

Z n | Z n^{2 +} (1 M) | | C u^{2 +} (0.1 M) | C u

Consider the cell:

Z n | Z n^{2 +} (a q) (1.0 M) | | C u^{2 +} (a q) (1.0 M) | | C u

The standard reduction potential are

0.350

V for

C u^{2 +} (a q) + 2 e^{-} \to C u

and

- 0.763

V for

Z n^{2 +} (a q) + 2 e^{-} \to Z n

The cell reaction is:

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Consider the following reactions: (i) Cu+HNO3(dil.)→ (ii) Cu+HNO3(conc.)→ (iii) Zn+HNO3(20%)→ (iv) Zn+HNO3(60%)→ Total number of reactions in which N2 is released is/are:

The corresponding reactions are: 3Cu+8HNO3dilute→2NO+3Cu(NO3)2+4H2O Cu+4HNO3Conc.→2NO2+Cu(NO3)2+2H2O 4Zn+10HNO3 (20%)→4Zn(NO3)2+N2O+5H2O Zn+4HNO3 (60%)→Zn(NO3)2+2NO2+2H2O So, total number of reactions in which N2 is released is 0.

Consider the following reactions:
$(i) C u + H N O_{3} (d i l .) \to$
$(i i) C u + H N O_{3} (c o n c .) \to$
$(i i i) Z n + H N O_{3} (20 %) \to$
$(i v) Z n + H N O_{3} (60 %) \to$
Total number of reactions in which $N_{2}$ is released is/are: