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Colour changes observed during the react...

Colour changes observed during the reaction between metal oxides and hydrogen are given below
(a) White `to` Bluish white (b) Brown `to ` Grey
(c) Yellow `to` Grey (d) Black `to` Red
Arrange the above colour changes as PbO to Pb , `Fe_(2)O_(3)`, to Fe, CuO to Cu and ZnO to Zn

A

c b d a

B

c d a b

C

c b a d

D

b c d a

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The correct Answer is:
A, C
`PbO + H_(2) to Pb + H_(2)O`
Yellow `" "` Grey
`Fe_(2)O_(3)+H_(2) to Fe + H_(2)O`
Brown `" "`Grey
`CuO + H_(2) to Cu + H_(2)O`
Black `" "` Red
`ZnO + H_(2) to Zn + H_(2)O`
White `" "` Bluish white
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PEARSON IIT JEE FOUNDATION-WATER, SOLUTION, SOLUBILITY AND HYDROGEN-Concept Application Level-1
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  3. Identify the binary solution among the following .

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  4. Hydrogen acts as an oxidizing agent when it

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  5. Tyndal effect cannot be shown by

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  6. Sodium catches fire and burns with a

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  7. Which of the following metals on reaction with steam provides a coatin...

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  8. The brown coloured substance formed when steam is passed over red hot ...

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  9. Which among the following metals react only with steam ?

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  10. Crystals can be made

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  11. Washing soda is an example of a/an substance .

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  12. Which among the following substance acts as a desiccating agent ?

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  13. Which of the following metals is unsuitable for the preparation of hyd...

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  14. The reaction between perfectly dry hydrogen and chlorine take place in...

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  15. Which of the following metals on treatment with concentrated alkali gi...

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  17. The specific heat capacity of water is

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