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Q: 50.0 cm³ of a KOH solution is titrated to the phenolphthalein end point with 7.50 cm³ of 1.0 M HCl. The concentration of KOH: (ETEA 2017)

A) 7.5 M

B) 0.75 M

C) 0.15 M

D) 1.5 M

Q: Molality of 10% w/w NaOH solution is: (ETEA 2017)

A) 1.5 m

B) 2.0 m

C) 2.5 m

D) 3.5 m

Q: If the force of attraction exists between the particles of dispersed phase and dispersion medium, the sol is called: (ETEA 2017)

A) Lyophilic

B) Lyophobic

C) Hydrophilic

D) Hydrophobic

Q: The molality of 2.0 g of NaOH [M-wt=40 g/mol] in 250 g of distilled water at 4°C will be exactly equal to: (ETEA 2018)

A) 0.20 m

B) 0.25 m

C) 1.20 m

D) 0.5 m

Q: The elevation in boiling point ΔTb is equal to ebullioscopy constant Kb when the molarity [M] of solution is: (ETEA 2018)

A) 0.1 m

B) 1.0 m

C) 10.0 m

D) Statement is wrong

Q: The mass of NaOH needed to prepare 0.2 molal solution in 500 g pure water at 4°C is: (ETEA 2018)

A) 0.4 g

B) 4.0 g

C) 1.5 g

D) 1.0 g

Q: A student dissolved 50.5 g KNO₃ [KNO₃ =101.0 g/mol] in 1000 g distilled water and allowed to boil. The solution started boiling: (ETEA 2018)

A) 100.52°C

B) 100°C

C) 101.04°C

D) KNO₃ insoluble in water

Q: During the formation of aqueous solution of any electrolyte: (ETEA 2018)

A) Heat is evolved

B) Heat is absorbed

C) Heat may evolve or absorbed

D) Electrolyte do not dissolve in water

Q: Addition of soluble impurities into a liquid and solid respectively causes: (ETEA 2018)

A) Increase in boiling point of liquid and decrease in melting point of solid

B) Increase in both boiling and melting points

C) Decrease in boiling point of liquid and increase in melting point of solid

D) Decrease in both boiling and melting points

Q: Which one of the following concentration units is temperature dependent? (ETEA 2019)

A) Molality

B) Mole fraction

C) Molarity

D) Both (a) & (c)

Q: Phase and dispersion medium for soap lather is respectively: (ETEA 2019)

A) Gas and solid

B) Gas and liquid

C) Liquid and liquid

D) Solid and liquid

Q: Which one is not correct for the stability of colloidal solution? (ETEA 2019)

A) Greater charge density on colloid

B) Less salvation energy

C) More Brownian motion

D) None of the above

Q: Which of the following pair is an example of completely immiscible liquid? (ETEA 2019)

A) Alcohol and water

B) Alcohol and ether

C) Water and ether

D) Carbon disulphide and water

Q: The study of heat changes accompanying chemical reaction is known as: (ETEA 2005)

A) Thermochemistry

B) Thermodynamics

C) Electrochemistry

D) Chemical kinetics

Q: Which of the following ions has largest heat of hydration? (ETEA 2005)

A) Ba²⁺

B) K⁺

C) Li⁺

D) Be²⁺

Q: The net heat change in a chemical reaction is same whether it takes place in one step or several steps. This law is known as: (ETEA 2005)

A) First law of thermodynamics

B) Henry's law

C) Hess's law

D) Joule's law

Q: Which of the following ions has largest heat of hydration? (ETEA 2007)

A) Ba²⁺

B) K⁺

C) Li²⁺

D) Be²⁺

Q: The change of enthalpy is a measure of the reaction at: (ETEA 2008)

A) Constant volume

B) Constant volume & pressure

C) Variable pressure

D) Constant pressure

Q: Ca²⁺ ions are more hydrated than Na⁺ ions because there are: (ETEA 2010)

A) Larger in size

B) Smaller in size

C) Divalent positively charged

D) Small and divalent positively charged

Q: A chemical system is sealed in a strong rigid container at room temperature and then heated vigorously. Change in work done during process is: (ETEA 2010)

A) Positive

B) Negative

C) Zero

D) Constant