#1 | Intro to d-Block
(Chemistry) > The d and f Block Elements
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Related Practice Questions :

Which of the following solid salt on heating with K2Cr2O7 and Conc. H2SO4 orange,red vapours are evolved which turn aquous NaOH solution yellow?

(a) NaBr

(b)NaCl

(c) NaNO3

(d) NaI

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Fe is made passive by :

(a) dil . H2SO4

(b) dil. HCl

(c) Conc. HNO3

(d) Conc. H2SO4

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Which of the following element does not show the variable oxidation state?

1. Fe

2. Mn

3. Cu

4. Zn

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Cr2O72-+XH+Cr3++H2O + oxidized product of X, X in the above reaction cannot be

1. C2O42-

2. Fe2+

3. SO42-

4. S2-

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The basic oxide is:

1. CrO

2. Cr2O3

3. CrO3

4. Cr2O4

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