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Question

Which combination cannot be used for the preparation of hydrogen gas in the laboratory?

I. Zn/conc.H2SO4,
II. Zn/dil.HNO3,
III. Zn/dil.H2SO4

Zinc in I and II is not very pure while in III, it is very pure.

  1. I and II
  2. I, II and III
  3. III only
  4. I and III

A
I, II and III
B
I and II
C
I and III
D
III only
Solution
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Similar Questions
Q1
Which combination cannot be used for the preparation of hydrogen gas in the laboratory?

I. Zn/conc.H2SO4,
II. Zn/dil.HNO3,
III. Zn/dil.H2SO4

Zinc in I and II is not very pure while in III, it is very pure.

View Solution
Q2

Which combination cannot be used for thepreparation of hydrogen gas in the
laboratory?

I.Zn/conc.H2SO4(Impure Zinc is used)

II.Zn/dil.HNO3 (Impure Zinc is used)

III.Zn/dil.H2SO4 (Very highly pure Zn is used)


View Solution
Q3
Consider the following reactions,
(I) Zn+dil.H2SO4ZnSO4+H2
(II) Zn+conc.H2SO4ZnSO4+SO2+H2O
Oxidising agents in I and II are _______ respectively
View Solution
Q4

Question 11
Which of the following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (iii) and (iv)

View Solution
Q5
Solubility of CuS(I), ZnS(II) and Na2S(III) in water is in order?
View Solution