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STOICHIOMETRY

Stoichiometry
A sample of well water contains 140 gm/m³ Ca²⁺ ions and 345 gm/m³ Na⁺ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO₃ in gm/m³ is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16)

140
350
345
485

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Stoichiometry
The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal __________ in the two phases.

Potential energy
Intermolecular forces
Kinetic energy
Total energy

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Stoichiometry
The total number of atoms in 8.5 gm of NH₃ is __________ x 1023.

9.03
6.02
3.01
1.204

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Stoichiometry
Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing ) ?

ΔH = 0
Both B and C
ΔH = 1 (+ ve)and Δ V = -ve
ΔV = 0

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Stoichiometry
Number of gm moles of solute dissolved in 1 kg of solvent is called its

Molarity
Normality
Formality
Molality

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