Class 11th
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a year agoContributor-Level 10
(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.
New answer posted
a year agoContributor-Level 10
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 increases the average kinetic energy of the molecules increases. Thus, there is a decrease in intermolecular force of attraction which decreases the surface tension.
(ii) Nature of the liquid: Greater the magnitude of intermolecular forces of attraction in the liquid, greater will be the value of surface tension.
New answer posted
a year agoContributor-Level 10
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.
New answer posted
a year agoContributor-Level 10
5.39. In liquids, the molecules are more compact in comparison to gases.
New answer posted
a year agoContributor-Level 10
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 above redox reaction may be depicted as:
Zn|Zn2+ (aq) | Ag+ (aq) | Ag
(i) Zinc electrode is negatively charged because oxidation occurs at the zinc electrode (i.e. electrons accumlulate on the zinc electrode)
(ii) The ions carry current. The electrons flow from Zn to Ag electrode while the current flows from Ag to Zn electrode.
New answer posted
a year agoContributor-Level 10
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.
New answer posted
a year agoContributor-Level 10
5.37. (i) Surface tension decreases with increase of temperature.
(ii) Viscosity decreases with increase of temperature.
New answer posted
a year agoContributor-Level 10
Lower the electrode potential, better is the reducing agent. Since the electrode potentials increase in the order: K+/K (-2.93 V), Mg2+/Mg (-2.37 V), Cr3+/Cr (-0.74 V), Hg2+/Hg (0.79 V), Ag+/Ag (0.80 V), therefore, reducing power of metals decreases in the same order, i.e., K, Mg, Cr, Hg, Ag.
New answer posted
a year agoContributor-Level 10
Based on the relative positions of these metals in the activity series, the correct order is Mg, Al, Zn, Fe, Cu.
New answer posted
a year agoContributor-Level 10
5.36. Avogadro law states that equal volumes of all gases under same conditions of temperature and pressure contain equal number of molecules.
Dalton's law of partial pressure states that total pressure exerted by a mixture of non-reacting gases is equal to the sum of partial pressures exerted by them.
Boyle's law states that under isothermal condition, pressure of a fixed amount of a gas is inversely proportional to its volume.
Charles' law is a relationship between volume and absolute temperature under isobaric condition. Itstates that volume of a fixed amount of gas is directly proportional to its absolute temperature (V? T)
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