(A) The mass percentage of a solution is calculated using the formula:$\text{Mass } \% = \frac{\text{mass of solute}}{\text{mass of solute} + \text{ma

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$0.01 \, g$ of $NaCl + 99.99 \, g$ of water

(A) The mass percentage of a solution is calculated using the formula:$\text{Mass } \% = \frac{\text{mass of solute}}{\text{mass of solute} + \text{mass of solvent}} \times 100$Given that the concentration is $0.01\%$ by mass,we test option $(a)$:$\text{Mass } \% = \frac{0.01 \, g}{0.01 \, g + 99.99 \, g} \times 100$$= \frac{0.01}{100} \times 100 = 0.01\%$Thus,option $(a)$ correctly represents the composition of the solution.

Class 9 Science IS MATTER AROUND US PURE?Mix Example - IS MATTER AROUND US PURE?

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Arun has prepared a $0.01\%$ (by mass) solution of sodium chloride in water. Which of the following correctly represents the composition of the solution?

A
$0.01 \, g$ of $NaCl + 99.99 \, g$ of water
B
$0.11 \, g$ of $NaCl + 100 \, g$ of water
C
$1.00 \, g$ of $NaCl + 100 \, g$ of water
D
$0.10 \, g$ of $NaCl + 99.90 \, g$ of water

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IS MATTER AROUND US PURE?

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Mix Example - IS MATTER AROUND US PURE?

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Arun has prepared a $0.01\%$ (by mass) solution of sodium chloride in water. Which of the following correctly represents the composition of the solution?

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State whether the following statement is true or false:The properties that can be observed and specified are called physical properties.

What would you observe when:$(a)$ a saturated solution of potassium chloride prepared at $60^{\circ} C$ is allowed to cool at room temperature?$(b)$ an aqueous sugar solution is heated to dryness?$(c)$ a mixture of iron filings and sulphur powder is heated strongly?

Tincture of iodine has antiseptic properties. This solution is made by dissolving

The substances that sublime can be made to liquefy by

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State whether the following statement is true or false:
The properties that can be observed and specified are called physical properties.

What would you observe when:
$(a)$ a saturated solution of potassium chloride prepared at $60^{\circ} C$ is allowed to cool at room temperature?
$(b)$ an aqueous sugar solution is heated to dryness?
$(c)$ a mixture of iron filings and sulphur powder is heated strongly?