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SURFACE CHEMISTRY QUIZ-7

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IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies. Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Q1. Statement 1: The concentration of sulphide ores by froth floatation is based on emulsification. Statement 2: Pine oil in water forms emulsion.
  •  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is False
  •  Statement 1 is False, Statement 2 is True
Solution
(c). Explanation is correct reason for statement.
Q2.  Statement 1: Physical adsorption is weaker than chemical adsorption.
Statement 2: Activated complex formed during adsorption possess lower energy level in chemisorption as it is more exothermic.
  •  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is False
  •  Statement 1 is False, Statement 2 is True
Solution
(c). Explanation is correct reason for statement.
Q3.Statement 1: Micelles are formed by surfactants above CMC. Statement 2: The conductivity of a solution having surfactant molecule decreases sharply at CMC.
  •   Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is False
  •  Statement 1 is False, Statement 2 is True
Solution
(d) Both are facts.

Q4. Statement 1: The presence of a catalyst increases the speed of the forward and backward reactions to the same extent.
Statement 2: Activation energy for both the forward and backward reactions is lowerd to same extent.
  •  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is False
  •  Statement 1 is False, Statement 2 is True
Solution
(a). Catalyst does not change the equilibrium point.

Q5.Statement 1: According to Freundlichx/m=K.P 1/n. Statement 2: The isotherm shows variation of the amount of gas adsorbed by the adsorbent with temperature.
  •  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
  •  c) Statement 1 is True, Statement 2 is False
  •  Statement 1 is False, Statement 2 is True
Solution
 (c). Freundilch adsorption isotherm gives an empirical relationship between the quality of gas adsorbed by unit mass of solid adsorbed and pressure at a particular temperature.

Q6. Statement 1: Enzymes are proteins and enzyme catalysed reactions are called biological catalysis. Statement 2: The activity of enzyme as catalyst is increased in presence of vitamins.
  •  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
  • Statement 1 is True, Statement 2 is False
  •  Statement 1 is False, Statement 2 is True
Solution
(d). Both are different facts but true.

Q7.Statement 1: According to Freundlich, x/m=k.p^(1/n) Statement 2: The isotherm shows variation of the amount of gas adsorbed by the adsorbent with temperature.
  •  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is False
  •  Statement 1 is False, Statement 2 is True
Solution
(c). Freundlich adsorption isotherm gives an empirical relationship between the quantity of gas adsorbed by unit mass of solid adsorbent and pressure at a particular temperature.

Q8.Statement 1: Medicines are more effective in colloidal form than in tablet form. Statement 2: The colloidal state possess larger surface area than coarse form.
  •  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is False
  •  Statement 1 is False, Statement 2 is True
Solution
(c). Larger surface area provides more pronounced adsorption of medicine over tissues and thus effectiveness increases.

Q9.Statement 1: The blue colour of sky is due to scattering of light by dirt or dust particles present in air. Statement 2: Larger size of dispersed phase particles show more scattering as well as higher is the wavelength of light longer is scattering.
  •  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is False
  •  Statement 1 is False, Statement 2 is True
Solution
(c). Explanation is correct reason for statement.

Q10. Statement 1: Lyophilic colloids are called reversible sols.
Statement 2: Lyophilic sols are liquid loving.

  •  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
  •  Statement 1 is True, Statement 2 is False
  • Statement 1 is False, Statement 2 is True
Solution
(b). If the dispersion medium is separated from the dispersed phase, the lyophilic sol can be reconstituted by simply remixing with the disperson medium. That is why these sols are also called reversible sols

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