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USHA PUBLICATION-P-BLOCK ELEMENTS( GR-15,GR16,GR17,GR18)-EXERCISE
- Why has it been difficult to study chemistry of radon ?
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- Acidified K2Cr2O7 solution changes to when SO2 gas is passed through i...
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- What is the shape of ozone molecule ?
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- Name two poisonous gases which can be prepared from Cl2.
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- H2O is a liquid while hydrogen sulphide is a gas at room temperature....
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- Write all the members of halogen family.
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- Which noble gas is used along with O2 for respiration by sea divers ?
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- Which noble gas is called as Hidden gas ?
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- Presence of Helium in earth was Ist proved by .
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- What is composition of Oleum ?
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- What is the role of MnO2 in the preparation of Cl2 from HCI?
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- Explain why the ionisation energy of nitrogen is more than that of oxy...
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- Write the equation for the reaction between CI2 and dil. NaOH solution...
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- Name the process employed for manufacture of NH3 from N2 and H2 .
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- Magnesium nitride on bolling with water forms .
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- Why is phosphoric acid syrupy in nature ?
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- Write the product formed when ammonia reacts with excess of chlorine.
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- Why is Iron passive with conc. NHO3 ?
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- What is the compound formed during brown ring test for nitrate.
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- Which oxide of nitrogen is paramagnetic ?
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