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#9 | n Factor or Valence Factor
(Chemistry) > Some Basic Concepts Of Chemistry
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A metal M forms a compound M2HPO4. The formula of the metal sulfate is:

1. M2SO4

2. MSO4

3. M(SO4${\right)}_{2}$

4. 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?

1. 60g

2. 80g

3. 40g

4. 20g

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The oxide of 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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What volume of ${\mathrm{O}}_{2}\left(\mathrm{g}\right)$ measured at 1 atm and 273 K will be formed by the action of 100 mL of 0.5 N KMnO4 on hydrogen peroxide in an acid solution? The skeleton equation for the reaction is
$\to {K}_{2}S{O}_{4}+MnS{O}_{4}+{O}_{2}+{H}_{2}O$

1.  0.12 litre

2.  0.028 litre

3.  0.56 litre

4.  1.12 litre

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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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