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Give reasons : Apparatus for laborator...

Give reasons :
Apparatus for laboratory preparation of hydrogen should be air tight and away from a naked flame.

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ICSE-STUDY OF THE FIRST ELEMENT - HYDROGEN-EXERCISE 6(D)
  1. Give reasons : Hydrogen is collected by the downward displacement of...

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  2. Give reasons : A candle brought near the mouth of a jar containing ...

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  3. Give reasons : Apparatus for laboratory preparation of hydrogen shou...

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  4. Select the odd one out and justify your answer. Zn, Fe, Mg and Na

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  5. Select the odd one out and justify your answer. SO2, H2 S, NH3 and C...

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  6. Select the odd one out and justify your answer. Fe, Zn, Cu and Mg

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

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

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  9. Reacting with water, an active metal produces

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

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

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

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

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

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

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  16. Hydrogen is.......... soluble in water.

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

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  18. Sodium ............... reacts smoothly with cold water.

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

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

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