#9 | n Factor or Valence Factor
(Chemistry) > Some Basic Concepts Of Chemistry
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H3PO4 is a tribasic acid and one of its salts is NaH2PO4. What volume of 1 M NaOH should be added to 12g NaH2PO4 (Molar mass 120) to exactly convert it into Na3PO4?

(a) 100 mL

(b) 300mL

(c) 200mL

(d) 80mL

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A metal M forms a compound M2HPO4. The formula of the metal sulphate is:

(a) M2SO4 

(b) MSO4

(c) M(SO4)2

(d) M2(SO4)3

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One mole of a mixture of CO and CO2 requires exactly 20g of NaOH in solution for complete conversion of all the CO2 into Na2CO3. How much NaOH would it require for conversion into Na2CO3, if the mixture (one mole) is completely oxidised to CO2?

(a) 60g

(b) 80g

(c) 40g

(d) 20g

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The oxide of a metal contains

40% by mass of oxygen. The percentage of chlorine in the chloride of the metal is

1) 84.7

(2) 74.7

(3) 64.7

(4) 44.7

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Copper forms two oxides. For the same amount of copper, twice as much oxygen was used to form first oxide than to form second one. What is the ratio of the valencies of copper in first and second oxides?

1. 2:5

2. 1:6

3. 2:1

4. 1:2

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