Ncert Solutions Chemistry Class 11th
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5.42. State and explain Dalton’s law of partial pressures. Can we apply Dalton’s law of partial pressures to a mixture of carbon monoxide and oxygen?
5.42. State and explain Dalton’s law of partial pressures. Can we apply Dalton’s law of partial pressures to a mixture of carbon monoxide and oxygen?
5.42. Dalton's law of partial pressure: When two or more non-reacting gases are enclosed in a vessel, the total pressure of the gaseous mixture is equal to the sum of the partial pressures that each gas will exert when enclosed separately in the same vessel at constant temperature.
P= P1 + P2 +
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8.35. Assertion: ClO4– does not show disproportionation reaction.
Reason: In ClO4–, chlorine is in minimum oxidation state of +1.
8.35. Assertion: ClO4– does not show disproportionation reaction.
Reason: In ClO4–, chlorine is in minimum oxidation state of +1.
(c) In ClO4–, chlorine is in maximum oxidation state of +7. So, it does not show the disproportionation reaction.
Upvote 5.41. What are ideal and real gases? Out of CO2 and NH3 gases, which is expected to show more deviation from the ideal gas behaviour.
5.41. What are ideal and real gases? Out of CO2 and NH3 gases, which is expected to show more deviation from the ideal gas behaviour.
5.41. Ideal Gas: A gas that follows Boyle's law, Charles' law and Avogadro law strictly, is called an ideal gas. It is assumed that intermolecular forces are not present between the molecules of an ideal gas.
Real Gases: Gases which deviate from ideal gas behaviour are known as real gases. NH3 is exp
Upvote 8.34. Assertion: While H2O2 can only act as oxidising agent in their reactions.
Reason: In H2O2 oxidation number of O is -1 and can vary from 0 to -2
8.34. Assertion: While H2O2 can only act as oxidising agent in their reactions.
Reason: In H2O2 oxidation number of O is -1 and can vary from 0 to -2
(d) In H2O2 oxidation number of O = -1 and can vary from 0 to -2 (+2 is possible in OF2). The oxidation number can decrease or increase, because of this H2O2 can act both asoxidising and reducing agent.
Upvote 8.33. Assertion: The highest value of oxidation number exhibited by an atom of an element generally increases across the period in the periodic table.
Reason: The oxidation number denotes theoxidation state of an element in a compound.
8.33. Assertion: The highest value of oxidation number exhibited by an atom of an element generally increases across the period in the periodic table.
Reason: The oxidation number denotes theoxidation state of an element in a compound.
(b) Both are correct statements but reason is not correct for the assertion. The highest oxidation number of a representative element is the group number for the first two groups and the group number minus 10 (following the long form of periodic table) for the other groups.
Upvote 5.40. (a) What do you mean by Surface Tension of a liquid?
(b) Explain the factors which can affect the surface tension of a liquid.
5.40. (a) What do you mean by Surface Tension of a liquid?
(b) Explain the factors which can affect the surface tension of a liquid.
5.40. (a) Surface tension: It is defined as the force acting per unit length perpendicular to the line drawn on the surface.
(b) Surface tension of a liquid depends upon following factors.
(i) Temperature: Surface tension decreases with rise in temperature. As the temperature of the liquid
Upvote Assertion and Reason:
Directions:
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
8.31. Assertion: Standard hydrogen electrode is called as reversible electrode.
Assertion and Reason:
Directions:
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
8.31. Assertion: Standard hydrogen electrode is called as reversible electrode.
Reason: It can react both as an anode as well a cathode in an electrochemical cell.
Answer: (a) A standard hydrogen electrode is called a reversible electrode because it can react both as anode as well as cathode in an electrochemical cell.
Upvote 5.39. In liquids, the molecules are more compact in comparison to gases.
Upvote 8.30. Depict the galvanic cell in which the reaction, Zn(s) + 2Ag+(aq) → Zn2+(aq) + 2Ag(s)
takes place. Further show:
(i) Which of the electrode is negatively charged.
(ii) The carriers of current in the cell and
(iii) Individual reaction at each electrode. (Advance)
8.30. Depict the galvanic cell in which the reaction, Zn(s) + 2Ag+(aq) → Zn2+(aq) + 2Ag(s)
takes place. Further show:
(i) Which of the electrode is negatively charged.
(ii) The carriers of current in the cell and
(iii) Individual reaction at each electrode. (Advance)
The given redox reaction can be depicted as
Zn (s) + 2Ag+ (aq) → Zn2+ (aq) + 2Ag (s)
Since Zn gets oxidised to Zn2+ ions, and Ag+ gets reduced to Ag metal, therefore,
Oxidation occurs at the zinc electrode and reduction occurs at the silver electrode. Thus, galvanic cell corresponding to the
Upvote 5.38. The temperature at which a real gas obeys ideal gas law over an appreciable range of pressure, is called Boyle temperature or Boyle point.
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