See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

Sol. Rate of photo emission at time t ] 40 3000 [ 10 19840 100 100 1 19 t dt dN      80 0 2 19 ] 20 3000 [ 10 19840 1 t t N     20 19 10 855 .1 10 55 . 18     N This is the number of photoelectron ejected in 1 blinking. In 1 hr, total number of photoelectron ejected is = 1.855 × 1020 × 20 = 3.71 × 1021 AITS-FT-I (Paper-1)-PCM-JEE(Advanced)/22 FIITJEE Ltd., FIITJEE House, 29-A, Kalu Sarai, Sarvapriya Vihar, New Delhi -110016, Ph 46106000, 26569493, Fax 26513942 website: www.fiitjee.com 12 Chemistry PART – II Section – A (Maximum Marks: 12) This section contains FOUR (04) questions. Each question has FOUR options. ONLY ONE of these four options is the correct answer. 20. Which of the following is NOT correct about hydrides ? I. Saline hydrides are stoichiometric and metallic hydrides are non-stoichiometric. II. BeH2 is monomeric whereas MgH2 is polymeric. III. Hydrides of the elements of Group 13 are electron deficient. IV. NaH reacts with water and liberates H2 whereas B2H6 does not react with water. (A) IV only (B) I and III (C) III only (D) II and IV Ans. D Sol. BeH2 is polymetric while MgH2 is monomeric 2 2 2 6 2 3 2 2NaH H O 2NaOH H B H H O B(OH) H       21. What is the major organic product of the following reaction? O O 3 2 4 2 CrO /H SO /H O Acetone  OH (A) O O CHO (B) O O COOH (C) CHO O (D) COOH O Ans. D Sol. O O 3 2 4 2 CrO /H SO /H O Acetone  OH COOH O AITS-FT-I (Paper-1)-PCM-JEE(Advanced)/22 FIITJEE Ltd., FIITJEE House, 29-A, Kalu Sarai, Sarvapriya Vihar, New Delhi -110016, Ph 46106000, 26569493, Fax 26513942 website: www.fiitjee.com 13 22. The solubility product of salt   AB M.W 100  is 10 2 4 10 M   at 25ºC. Loss in weight of precipitate of AB by washing it with 5 litre of water is (A)