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Calcium phosphide is used in smoke scree...

Calcium phosphide is used in smoke screen because it.

A

Burns to form soot

B

Gives phosphine which catches fire to give needed smoke

C

Immediately catches fire in air

D

Is a gas which brings tears in the eyes

Text Solution

Verified by Experts

The correct Answer is:
B
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CENGAGE CHEMISTRY ENGLISH-P-BLOCK GROUP 15 ELEMENTS - THE NITROGEN FAMILY-Exercises (Single Correct)
  1. PCl5 and PH3 exist but PH5 does not because

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  2. The structure of phosphide ion is similar to that of

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  3. Calcium phosphide is used in smoke screen because it.

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  4. Holme's signals produce burning gases which serve as a signal to the a...

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  5. Among the following the strongest acid is

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  6. Basicity of H3 PO4 and H3 PO3 are

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  7. Phosphoric acid is syrupy in nature due to hydrogen bonding. Each mole...

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  8. PCl3, P4 O6 and P4 O10, PCl5 on hydrolysis gives respectivey.

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  9. If phosphorous acid is allowed to react with sufficient quantity of KO...

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  10. Which one of the following pairs is obtained on heating ammonium dichr...

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  11. By mixing ammonium chloride to potassium nitrite and heating, we get

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  12. In which salt,on heating gives a mixture of two gases is

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  13. Ammonia is not used

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  14. Which one of the following is used for drying of ammonia ?

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  15. Phosphorus is kept in

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  16. It is recommended that ammonia bottles be opened after cooling in ice ...

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  17. Silver chloride dissolves in excess of NH4OH. The cation present in so...

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  18. When NH4OH is added to copper sulphate solution, blue colour is obtain...

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  19. A certain element is forms a solid oxide which dissolves in water to f...

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  20. A colourless gas X forms a brown coloured gas when mixed with air. The...

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