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USHA PUBLICATION-P-BLOCK ELEMENTS( GR-15,GR16,GR17,GR18)-EXERCISE
- Explain why a blue litmus dipped into a solution of hypochlorous acid ...
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- What is etching of glass ?
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- What is the action of hydrochloric acid on potassium permanganate ?
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- What happens when ammonia is heated with cupric oxide ?
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- What happens when ammonium hydroxide is added to sulphate solution fir...
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- Write the structural formula of H3PO3 and H3PO4 .
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- Why NO2 dimerise to N2O4 ?
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- What are the favourable conditions for synthesis of NH3 by Haber's pro...
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- Why is PCI5, more covalent than PCI3 ?
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- Explain why the reducing power for the hydrides of Gr-15 increases dow...
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- Why does Nitrogen exist as N2 white phosphorus as P4 ?
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- Why does ozone act as a powerful oxidant?
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- List the important sources of sulphur.
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- Name two poisonous gases which can be prepared from Cl2.
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- Write the anomalous properties of fluorine.
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- Mention some important uses of sulphuric acid.
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- Explain, that in SO2 the two S-O bonds are equal in length.
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- Why does NH3 form hydrogen bond but PH3 does not ?
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- How copper metal gives different products with nitric acid ?
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- Write three difference in properties of white phosphorus and red phosp...
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