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CBSE Class 11 Some Basic Concepts of Chemistry — practice questions

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The molecular mass of water H$_2$O (using H = 1, O = 16) is:One mole of any substance contains:In the reaction $2H_2 + O_2 \to 2H_2O$, $4$ moles of $H_2$ are mixed with $1$ mole of $O_2$. The mass of waterA solution contains $0.5$ mol NaCl in $2$ L of solution. Its molarity is: