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USHA PUBLICATION-P-BLOCK ELEMENTS( GR-15,GR16,GR17,GR18)-EXERCISE
- 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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- Arrange H2O,H2S,H2Se,H2Te in order of increasing thermal stability.
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- How does ozone react with silver metal ?
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- What happens when PbS is treated with ozone ?
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- The Halogen which has the highest electron affinity :
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- Which of the halogens (excluding astatine) has highest electronegativi...
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- Which of the halogens (excluding astatine) is strongest oxidant ?
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- Which of the halogens (excluding astatine)has lowest ionisation energy...
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- How is H2S prepared in the laboratory ?
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- How can you prepare HCl gas in the laboratory?
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