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81.

What is magnesia cement or Sorel's cement?

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82.

What happens when a burning magnesium ribbon is introduced into a jar of carbon dioxide?

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83.

Bones contain calcium ions. What do you think which anions are associated with them?

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When calcium oxide(quick lime) is heated with coke in an electric furnance at 2273- 3273 K, calcium carbide (CaC₂) is formed.

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85.

Why is calcium preferred over sodium to remove last traces of moisture from alcohol?

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86.

What is concrete?

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87.

What is fly ash?

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88.

What are representative elements?

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89.

Name the elements of group 1. Write their electronic configurations.

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90.

Discuss the general trends in atomic and ionic radii of alkali metals.

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