Fill in the blanks with the choices given in brackets.
(i) Metals are good _______ (oxidizing agents / reducing agents) because they are electron _ (acceptors /donors).
(ii) Electrovalent compounds have _ (high / low) melting points.
(iii) Higher the pH value of a solution, the more (acidic / alkaline) it is.
(iv) ______ ( $A g C l$ / $P b {C l}_{2}$ ), a white precipitate is soluble in excess $N H_{4} O H$ .
(v) Conversion of ethene to ethane is an example of _________ (hydration / hydrogenation).

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Solution

(i) Metals have 1,2 or 3 valence electrons hence it is easy for they to donate these valence electrons and so they are electron donars. Also they are good reducing agents as they oxidize themselves by donating electrons.

(ii) Electrovalent compounds are formed when ions of different charges are attracted towards each other. So, stronger the attraction between them more energy is required to break the bonds and hence high melting points.

(iii) The pH rang below 7 is acidic and that above 7 is alkaline.

(iv) When $A g N O_{3}$ reacts with HCl, white precipitate of AgCl is obtained which are soluble in excess $N H_{4} O H$
$A g C l + 2 N H_{4} O H \to A g (N H_{3})_{2} C l + 2 H_{2} O$

(v) Hydrogenation means of addition of hydrogen.
For conversion of ethene to ethane addition of hydrogen is to be done.

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