5. A 42.12% (w/v) solution of NaCl causes precipitation of a certain sol in 10 hours. The coagulating value of NaCl for the sol is [Given molar mass: Na = 23.0g mol; CI = 35.5g mol] (a) 36 mmol L-1 6. 7. (b) 36 moll- (c) 1440 moll-1 (d) 1440 mmolL-1 Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion (A): The first ionization enthalpy for oxygen is lower than that of nitrogen Reason (R): The four electrons in 2p orbitals of oxygen experience more electron electorn repulsion. In the light of the above statements, choose the correct answer from the options given below: (a) Both A and B are correct and R is the correct explanation of A. (b) Both A and R are correct but R is NOT the correct explanation of A. (c) A is correct but R is not correct. (d) A is not correct but R is correct. Match List - I with List - II: List - I (Ore) (A) Siderite (B) Malachite (C) Sphalerite (D) Calamine List - II (Composition) (I) FeCO3 (II) CUCO3. Cu(OH)2 (III) ZnS (IV) ZnCO3 Choose the correct answer from the options given below: (a) (A)-(1), (B)-(II), (C)-(III), (D)-(IV) (b) (A)-(III), (B)-(IV), (C)-(II), (D)-(I) (c) (A)-(IV), (B)-(III), (C)-(1), (D)-(II) (d) (A)-(1), (B)-(II), (C)-(IV), (D)-(III)