Ncert Solutions Chemistry Class 11th
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9.2. Write the names of isotopes of hydrogen. What is the mass ratio of these isotopes?
9.2. Write the names of isotopes of hydrogen. What is the mass ratio of these isotopes?
9.2.
Mass ratio of the isotopes = Protium: Deuterium: Tritium = 1: 2 :3
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7.93. (i) Define Le Chatelier’s principle.
(ii) Following reactions occur in a Blast furnace.
Fe2O3(s) + 3CO(g) ———–>2Fe(s) + 3CO2(g)
Use Le Chatelier’s principle to predict the direction of reaction when equilibrium mixture is disturbed by
(a) adding Fe2O3 (b) removing CO2.
(c) removing CO.
7.93. (i) Define Le Chatelier’s principle.
(ii) Following reactions occur in a Blast furnace.
Fe2O3(s) + 3CO(g) ———–>2Fe(s) + 3CO2(g)
Use Le Chatelier’s principle to predict the direction of reaction when equilibrium mixture is disturbed by
(a) adding Fe2O3 (b) removing CO2.
(c) removing CO.
(i) Le Chatelier's principle states that the change in any factor such as temperature, pressure, concentration, etc. will cause the equilibrium to shift in such a direction so as to reduce or counteract the effect of the change.
(ii) (a) On adding Fe2O3 (s), the equilibrium will remain unaffected.
Upvote 7.92. Describe the effect of change in temperature on a chemical equilibrium.
7.92. Describe the effect of change in temperature on a chemical equilibrium.
Whenever equilibrium is disturbed by change in the concentration, pressure or volume, the composition of the equilibrium mixture changes because the reaction quotient, Qc no longer equals the equilibrium constant, Kc. However, when a change in temperature occurs, the value of equilibrium constant, K
Upvote 7.91. Describe the effect of addition of inert gas on a chemical equilibrium.
7.91. Describe the effect of addition of inert gas on a chemical equilibrium.
If the volume is kept constant and an inert gas such as argon is added which does not take part in the reaction, the equilibrium remains undisturbed. It is because the addition of an inert gas at constant volume does not change the partial pressures or the molar concentrations of the substance invol
Upvote 7.90 A reddish colour appears on adding two drops of 0.002 M potassium thiocynate solution to 1 mL of 0.2 M iron(III) nitratesolution due to the formation of [Fe(SCN)]2+. Elaborate on the development of the reddish colour.
7.90 A reddish colour appears on adding two drops of 0.002 M potassium thiocynate solution to 1 mL of 0.2 M iron(III) nitratesolution due to the formation of [Fe(SCN)]2+. Elaborate on the development of the reddish colour.
The intensity of the red colour becomes constant on attaining equilibrium. This equilibrium can be shifted in either forward or reverse directions depending on adding a reactant or a product. The equilibrium can be shifted in the opposite direction by adding reagents that remove Fe3+or SCN– ions. Fo
Upvote 7.89. Why does the solubility of salts of weak acids like phosphates increase at lower pH?
7.89. Why does the solubility of salts of weak acids like phosphates increase at lower pH?
This is because at lower pH, the concentration of the anion decreases due to its protonation. This in turn increase the solubility of the salt so that Ksp = Qsp.
Upvote 7.88. Define Buffer Solution. Give two characteristics of a buffer solution.
7.88. Define Buffer Solution. Give two characteristics of a buffer solution.
The solutions which resist change in pH on dilution or with the addition of small amounts of acid or alkali are called Buffer Solutions.
- Its pH does not change on the addition of small amount of acid or base.
- Its pH does not change on dilution or standing.
Upvote 9.1. Justify the position of hydrogen in the periodic table on the basis of its electronic configuration.
9.1. Justify the position of hydrogen in the periodic table on the basis of its electronic configuration.
9.1. Hydrogen has electronic configuration 1s1similar to the outer electronic configuration (ns1) of alkali metals, which belong to the first group of the periodic table. On the other hand, like halogens (with ns2np5) configuration belonging to the seventeenth group of the periodic table, it is
Upvote 7.87. Define solubility product. How does common ion affect the solubility of electrolyte?
7.87. Define solubility product. How does common ion affect the solubility of electrolyte?
It is product of molar concentration of ion raised to the power of number of ions produced per compound in saturated solution.
Solubility of electrolyte decreases due to common ion effect.
Upvote 7.86. What is meant by equilibrium and ionic equilibrium?
7.86. What is meant by equilibrium and ionic equilibrium?
Equilibrium is a state at which rate of forwarding reaction is equal to the rate of backward reaction. The equilibrium between ions and unionised molecules is called ionic equilibrium.
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