Explanation:
Oxidizing agent is the reactant in the chemical reaction which oxidizes others and reduces itself.
Reducing agent is the reactant in the chemical reaction which reduces others and oxidizes itself.
(a) In the given reaction :-
Cr exists in +6 oxidation state in and forms in which it has +3 oxidation state.
Thus, it is reduced in the chemical reaction. Thus, is oxidizing agent and is the reducing agent.
(b) In the given reaction :-
Zn exists in 0 oxidation state in and forms in which it has +2 oxidation state.
Thus, it is oxidized in the chemical reaction. Thus, Zn is reducing agent and is the oxidizing agent.
Answer:
Photosynthesis converts carbon dioxide and water into oxygen and glucose. Cellular respiration converts oxygen and glucose into water and carbon dioxide.
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Quantity of K2S m = 0.105 m
Number of ions i = 2(K) + 1(S) = 3
Freezing point depression constant of water Kf = 1.86
delta T = i x m x Kf = 3 x 0.105 x 1.86 = 0.586
Freezing point = 0 - 0.586 = 0.586 C
Boiling point constant of water Kb = 0.512
delta T = i x m x Kb = 3 x 0.105 x 0.512 = 0.161
Boiling point = 100 + 0.161 = 100.161 C