3. Which of the following contain most number of hydrogen atoms ? (A) 2.0 x 106 mg H2O (B) 10 ppm H2 in 10kg dry ice (C) 1.0 x 104 ng H2 (D) 10-4 mole CH4

9. Which of the following statement is correct when 0.1 M of AgNO3(aq) and 0.1M of KI(aq) are mixed? (A) KNO3 will precipitate; Ag+ and I- will be spectator ions. (B) No precipitate will form (C) AgI will precipitate; K+ and I- will be spectator ions. (D) AgI will precipitate; K+ and NO3- will be spectator ions.