Period Table & Energy Random Retrieval

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Period Table & Energy Random Retrieval

This quiz contains all the questions in the Period Table & Energy section. The website will pick 10 questions at random.

1 / 10

Which of these are examples of heterogeneous equilibria?

(i) CaCO3(s) <=> CaO(s) + CO2(g)

(ii) Fe2+(aq) + Ag+(aq) <=> Fe3+(aq) + Ag(s)

(iii) 3Fe(s) + 4H2O(g) <=> Fe3O2(s) + 4H2(g)

(iv)Br2(aq) + H2O(l) <=> HOBr(aq) + H+(aq) + Br-(aq)

2 / 10

Chlorine disproportionates when it reacts with:

3 / 10

Iodine oxidises thiosulfate ions, S2O32 -, to S4O62- . What is the oxidation number (O.N.) change for each sulfur atom?

4 / 10

The carbonates of group 2 metals (M):

(i) have the formula of the form MCO3

(ii) are insoluble in water

(iii) become more difficult to decompose on heating down the group

(iv) decompose on heating to the metal and carbon dioxide

5 / 10

Bubbling carbon dioxide into an aqueous solution of calcium hydroxide produces a white precipitate of:

6 / 10

The reaction of calcium with water produces:

7 / 10

What is the oxidation number of CARBON in methanoic acid

HCOOH

8 / 10

What is the oxidation number of NITROGEN in

NH4+

9 / 10

What is the oxidation number of CARBON in

C2H6

10 / 10

What is the oxidation number of NITROGEN in

NH3

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