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USHA PUBLICATION-P-BLOCK ELEMENTS( GR-15,GR16,GR17,GR18)-EXERCISE
- What happens when hydrochloric acid is added to silver nitrate solutio...
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- Why does only xenon from stable compounds among the noble gases?
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- What was the first noble gas compound and who prepared it?
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- Write four characteristic properties of noble gases.
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- Why is neon used in beacon light ?
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- Which noble gas is used along with O2 for respiration by sea divers ?
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- What happens when Nal is heated with conc. H2SO4 ?
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- Oxygen exists as O2 while sulphur exists as S8,although they belong to...
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- What happens when Cl2 gas is passed through dry slaked lime?
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- Why HF cannot be stored in glass bottle ?
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- Give one example of each in which SO2 acts as reductant and oxidant re...
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- Why is oxygen a gas sulphur a solid at while room temperature ?
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- Explain why CIF3 exists where as FCI3 does not.
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- What happens when Cl2 gas is passed through a solution of NaI?
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- What is aqua regia? What is its use ?
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- For dilution of H2SO4,H2O should not be added to conc. H2SO4. Give the...
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- Explain why bond angle in H2S is lower than in H2O ?
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- A mixture of three gases A, B, C is passed first through acidified K2C...
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- Why do noble gases have comparatively large atomic size in a particula...
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- Why are halogens coloured ?
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