Recent questions tagged liquids-solids-and-phase-change

A mixture contains 9 gram each of $H_2O$ and $NaCl,$ what is the mole fraction of NaCl?

asked Aug 13, 2018 by meena.p

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A solution has $25\%$ w/w solution of Sodium Chloride in 10 grams of water what is the mole fraction of Sodium Chloride?

asked Aug 13, 2018 by meena.p

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The mass fraction of KCl in its aqueous solution is 0.051. What is the mole fraction of sodium chloride in the solution?

asked Aug 13, 2018 by meena.p

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The mole fraction of NaCl in water is 0.22. What is its mass percent?

asked Aug 13, 2018 by meena.p

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Which of the following choices is characteristic of molality?

asked Aug 13, 2018 by meena.p

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Calculate the molality of a solution of sodium hydroxide which contains 0.2 g of NaOH in 50 grams of the solvent

asked Aug 13, 2018 by meena.p

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The solution which is obtained after filtration is

asked Aug 10, 2018 by meena.p

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The solution of impure compound and solvent is concentrated to get

asked Aug 10, 2018 by meena.p

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At room temperature, the impure compound in crystallisation is

asked Aug 10, 2018 by meena.p

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Select the correct statement from the following options.

asked Aug 10, 2018 by meena.p

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The molar heat of vaporisation $(\Delta \;H_{vap})$ for water is

asked Aug 10, 2018 by meena.p

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An octahedral void is present at each edge of the FCC lattice. How much of each of these voids belong to each unit cell?

asked Aug 10, 2018 by meena.p

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If N is the number of tetrahedral voids in a close-packed structure, then the number of octahedral voids is:

asked Aug 10, 2018 by meena.p

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The density of a solution prepared by dissolving $120 \;g$ of urea (mol.mass = 60 u) in 1000 g of water is 1.15 g/mL. The molarity of this solution is:

asked Aug 10, 2018 by meena.p

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The density $(in\; g\; mL^{–1})$ of a $3.60\; M$ sulphuric acid solution that is $29\%\; H_2SO_4$ (Molar mass =$ 98\; g\; mol^{–1})$ by mass will be:

asked Aug 10, 2018 by meena.p

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Calculate the molality of a solution containing $6.3$ grams of Oxalic acid crystals dissolved in $0.5$ kilograms of solvent. Molecular weight of Oxalic acid = 126 grams/mole.

asked Aug 9, 2018 by meena.p

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What is the molality of a solution of $0.540\; M \;HCl$ present in $155\; ml$ of solution. The weight of the solute, water, is $0.150 \;kg.$

asked Aug 9, 2018 by meena.p

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Co-ordination number of a crystalline solid is

asked Aug 9, 2018 by meena.p

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The edge length of an FCC lattice is X times the atomic radius. Value of X is:

asked Aug 9, 2018 by meena.p

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The void fraction is the ratio of unfilled volume to total volume of a structure. For ideal metallic FCC crystal, it is:

asked Aug 9, 2018 by meena.p

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Number of particles in one unit cell of HCP lattice is:

asked Aug 9, 2018 by meena.p

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With increase in temperature, which of these changes?

asked Aug 9, 2018 by meena.p

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Two solutions of a substance are mixed in the following manner. $480 \;ml $ of $1.5\;M$ First solution +$520\;ml\;of\;1.2 M$ second solution . What is the molarity of the final mixture?

asked Aug 9, 2018 by meena.p

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A solid of density d is dropped in a liquid of density D, if d>D then,

asked Aug 9, 2018 by meena.p

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What is the molar concentration of a solution with 32 grams of $SO_2$ in 0.5 liter solution?

asked Aug 9, 2018 by meena.p

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What is the concentration of a solution with 10 grams of calcium in $1000\; m^{3}$ of water?

asked Aug 9, 2018 by meena.p

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Which of the following is not the unit of concentration?

asked Aug 9, 2018 by meena.p

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What is the mass fraction of 4 moles of Sodium in 8 moles of Hydrogen chloride?

asked Aug 9, 2018 by meena.p

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How many atoms of carbon represent 1.5 mole?

asked Aug 9, 2018 by meena.p

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Which of the following is heat required in phase transitions?

asked Aug 9, 2018 by meena.p

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A solution has $25\%$ w/w solution of Sodium Chloride in 10 grams of water what is the mole fraction of Sodium Chloride?

asked Aug 9, 2018 by meena.p

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If the mole fraction of 4.5 moles of solute is 0.5, what is the number of moles of solvent?

asked Aug 9, 2018 by meena.p

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What is the mole fraction of sodium with moles n in a solution with moles of solvent N?

asked Aug 9, 2018 by meena.p

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Number of particles in one unit cell of HCP lattice is:

asked Aug 7, 2018 by meena.p

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Coordination number of HCP and FCC lattices respectively are

asked Aug 7, 2018 by meena.p

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The edge length of $NaCl$ unit cell is $500\; pm$. What is the density of $NaCl$ in $g/cm^3 ?$ [NA = 6.02 x 1023, Na = 23.0, Cl = 35.5 a.m.u.]

asked Aug 7, 2018 by meena.p

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Copper crystallises in face-centred cubic lattice and has a density of $8.930\; g\; mol^{-3}$ at 293 K. Calculate the edge length of unit cell. [At. mass of Cu = 63.5 a.m.u, Avogadro's constant NA = 6.02 x 1023].

asked Aug 7, 2018 by meena.p

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Crystallisation is based on the

asked Aug 7, 2018 by meena.p

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Which of the following is not a common method used for purification?

asked Aug 7, 2018 by meena.p

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Calculate the molarity of a solution created by pouring $7.62\; grams$ of $MgCl_2$ into enough water to create 400 mL of solution.

asked Aug 7, 2018 by meena.p

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Calculate the molarity of a solution containing 100 gr of $NaCl\; (Mw = 58.5)$ in 1.5 liters of water.

asked Aug 7, 2018 by meena.p

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Calculate the ml of a 1 M solution of NaCl needed to prepare 100 ml of a 0.2 M solution.

asked Aug 7, 2018 by meena.p

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A solution of $NaOH (mw = 40)$ is prepared by dissolving 20 grams of the base in enough water to make one liter of solution. Calculate the molarity of this solution.

asked Aug 7, 2018 by meena.p

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What are the disadvantages of using high alkaline water?

asked Aug 7, 2018 by meena.p

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With respect to the constituents causing alkalinity in water, which of the following situation never arises?

asked Aug 7, 2018 by meena.p

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The normal boiling point of a liquid is the temperature at which it boils when the external pressure is

asked Aug 7, 2018 by meena.p

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The boiling point and molar heat of vaporisation is dependent on

asked Aug 7, 2018 by meena.p

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The process of distillation is used for the liquids having

asked Aug 7, 2018 by meena.p

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Porcelain pieces are put into the distillation flask to avoid

asked Aug 6, 2018 by meena.p

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State true or false. Alkalinity is a measure of the ability of water to neutralize the acids.

asked Aug 6, 2018 by meena.p

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