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Helium is preferred to hydrogen for fill...

Helium is preferred to hydrogen for filling balloons because it is :

A

lighter than air

B

almost as light as hydrogen

C

non-combustible

D

inflammable.

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ICSE-STUDY OF THE FIRST ELEMENT - HYDROGEN-EXERCISE 6(D)
  1. Select the odd one out and justify your answer. Fe, Zn, Cu and Mg

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  2. Select the odd one out and justify your answer. Fe, Pb, Al and Zn

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  3. Helium is preferred to hydrogen for filling balloons because it is :

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  4. Reacting with water, an active metal produces

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  5. Name the following A metal oxide that can be reduced by hydrogen.

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  6. Which of the following statements about hydrogen is incorrect?

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  7. For the reaction PbO + H2 to Pb + H2 O, which of the following stateme...

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  8. Which metal gives hydrogen with all of the following: water, acids, al...

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  9. Which of the following metals does not liberate hydrogen from acids?

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  10. When CuO reacts with hydrogen, .............. is reduced and ............

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  11. Hydrogen is.......... soluble in water.

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  12. Metals like …………. , …………. and ........... give H2 with steam.

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  13. Sodium ............... reacts smoothly with cold water.

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  14. A metal.. hydrogen in the activity series gives hydrogen with ...........

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  15. Correct the following statements : Hydrogen is separated from CO by...

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  16. Correct the following statements : All metals react with acids to g...

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  17. Correct the following statements : Hydrogen is dried by passing it t...

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  18. Correct the following statements : Very dilute nitric acid reacts wi...

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  19. Correct the following statements : Conc. H2 SO4 reacts with zinc to ...

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  20. Name : an oxidizing agent that does not contain oxygen.

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