Formatting page ...
electrolyte at afions. DELHIPUBLIC SCHOOL NEWTOWN SESSION 2024-25 PRE BOARD EXAMINATION FULL MARKS: 80 CLASS: X TIME: 2HOURS SUBJECT: CHEMISTRY .SET A) Maximum Marks: 80 Tine allowed: Two hours Answers to this Paper must be written on the paperprovided separately. You will not be allowed to write during first 15 minutes. This time is to be spent in reading the question papet he time given at the head of thisPaper is the time allowed for writing the answers. Decton A is compulsory, Attempt amy four guestions from Section B. The intended marks jor questions or parts of questions are given in brackets [|. (This paper consists of seven printed pages) SECTION A Question 1 (Attempt all questions from this Section) Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.) () A mnetal spoon is to electroplated with nickel. Which of the following could be the electrodes? P. anode: spoon; cathode: nickel Q. anode: nickel; cathode: nickel R. anode: nickel; cathode: spoon (a) both P andQ [15| (b) only Q (c) onlyP (d onlyR ( ) A student did an activity in which he added bicarbonate to hydrochloric acid. The gas released was passed through lime water.sodium What change would be observed in lime water? (a) bubbles were formed b white turbid was formed (c) the solution became colourless (d) the colour of the solution became red (i )) Which of the following has higher number of molecules? (a) 20 gram of oxygen (b) 5 gram of nitrous oxide (c) 2.24 litres of sulphur dioxide at STP 2 gram atoms of chlorine [At. Wt:- 0-16, N=14, (iv)The reaction taking place at anode during silver plating is: (a) 40H-4e- 2H20+ 02 (bj Ag-e Agt (c) 2CN-2e+2C+ N2 (d) Agt te Ag A/1 S=32,Cl=35.5]
|
