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Q1. What are the elements with eight electrons in their outermost energy shell are called as?

Q2.What are metalloids?

Q3. What is Mendeleeve’s periodic table?

Q4.What is tetravalency of carbon?

Q5. Heating ammonium chloride with sodium hydroxide produces which gas?

Q6. What happens when ammonium sulphate is heated with sodium hydroxide solution ?

Q7. In the presence of a catalyst, nitrogen and hydrogen combine to give a gas. When the same gas is passed through water, it forms a solution, which will be alkaline in nature, and will contain the two types of ions and a coloured precipitate of iron [II] hydroxide is formed when the above solution is added to iron [ll] sulphate solution. Give the stepwise complete reactions.

Q8. Give the balanced chemical equations for the following.

a.      Heating of ammonium nitrate

b.     Heating of magnesium nitrate

c.      Heating of Magnesium nitride

d.     Heating of NH4Cl

Q9. How can Magnesium be converted to ammonia ?

Q 10. What is baking soda ?

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