Commercial sodium hydroxide weighing 30 g has some sodium chloride in it. The mixture on dissolving in water and subsequent treatment with excess silver nitrate solution formed a precipitate weighing 14.3 g. What is the percentage of sodium chloride in the commercial sample of sodium hydroxide? The equation for the reaction is

Nacl + AgNO₃→ AgCl + NaNO₃

18.22%

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14.33%

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16.11%

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19.33 %

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12.10 %

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Solution

The correct option is D
19.33 %

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(a) A gas cylinder contains 24 × 10²⁴ molecules of nitrogen gas. If Avogadro's number is 6 × 10²³ and the relative atomic mass of nitrogen is 14, calculate:
(i) Mass of nitrogen gas in the cylinder.
(ii) Volume of nitrogen at STP in dm³.

(b) Commercial sodium hydroxide weighing 30 g has some sodium chloride in it. The mixture on dissolving in water and subsequent treatment with excess silver nitrate solution formed a precipitate weighing 14.3 g.What is the percentage of sodium chloride in the commercial sample of sodium hydroxide? The equation for the reaction is
NaCl + AgNO₃ → AgCl + NaNO₃.
[Relative molecular mass of NaCl = 58; AgCl = 143]

(c) A certain gas 'X' occupies a volume of 100 cm³ at S.T.P. and weighs 0.5 g. Find its relative molecular mass.

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(a) A gas cylinder of capacity of $20 d m^{3}$ is filled with gas X the mass of which is 10 g. When the same cylinder is filled with hydrogen gas at the same temperature and pressure the mass fo the hydrogen is 2 g, hence the relative molecular mass of the gas is :
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(b) (i) Calcium carbide is used for the artificial ripening of fruits. Actually the fruit ripens beause fo the heat evolved while calcium carbide reacts with and acetylene gas is formed. If $200 c m^{3}$ of acetylene is formed from a certain mass of calcium carbidem, find the volume of oxygen required and carbon dioxide formed during the complete combustion. The combustion reaction can be represented as below.
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(c) (i) A gas cylinder contains $24 \times 10^{24}$ moleules of nitrogen gas. If avogadro's number is $6 \times 10^{23}$ and the relative atomic mass of nitrogen is 14, calculate:
(1) Mass of nitrogen gas in th ecylinder
(2) Volume of nitrogen at STP in $d m^{3}$
(ii) Commercial sodium hydroxide wieghing 30 g has some sodium chloride in it. The mixture on dissolving in water and subsequent treatment with excesss silver nitrate solution formed a precipitate weighing 14.3 g. What is the percentage fo sodium chloride in the commercial sample of sodium hydroxide? The equation for the reaction is
$N a C l + A g N O_{3} \to A g C l + N a N O_{3}$
[Relative molecular mass of $N a C l = 58; A g C l = 143$ ]
(iii) A certain Gas 'X' occupies a volume of $100 c m^{3}$
at S.T.P. and weighs 0.5 g. Find its relative moleular mass.

Q. 3.6 g mixture of sodium chloride and potassium chloride is dissolved in water. The solution is treated with excess of silver nitrate solution. 7.74 g of silver chloride is obtained. Find the percentage of sodium chloride and potassium chloride in the mixture.

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The correct option is D 19.33 %

The correct option is D
19.33 %