Q1- Answer shortly the following questions (1 marks each, Max 2 to 3 lines) (8)

Question

Q1- Answer shortly the following questions (1 marks each, Max 2 to 3 lines) (8) 1- During the reaction: aCH4 b 02cCO2 dH20, the carbon in CH is said to be oxidized. Why? 2- Define Z-scheme in photosynthesis and name the stages involved in the reaction. 3 What are the two main function of electron and proton transfer in photosynthesis? 4- The half-cell reaction of a metal M is: 5- 6- 7- 8- The standard cell potential is highly negative, the electronegativity of the metal will be large or small? What is the role of enzymes in biological processes? What are the different steps in anaerobic digestion and how they differ from fermentation? What is the difference between electronegativity and electron affinity? If you require estimating, the lower heating value of a substance how it is different from HHV estimation method in calorimetry Q2- Answer the following questions: (3) 1- 2- 3- Determine the oxidation number of P in(HPO Determine the oxidation number of Cr in (Cr20 Balance the following reaction (consider that OH ions are present in the solution) [A(OH)4]-+ N2H4 Au + N2

Explanation / Answer

QUESTION 1

          the stages involved are

during second stage,light independent reactions use these products to capture and reduce co2

5. Enzymes acts as biological catalysts and they accelrate chemical reactions

7.   Elecro negativity is the ability to attract elecrons from outside and electron affinity is the energy released when neutral atom gains eletron from outside

E.N is applied for single atom where as E.A is applied for atom /molecule

QUESTION - 2

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