CBSE Class 11-science Questions and Answers

If you are looking for Class 11 Science online study materials, you’ve come to the right place. On TopperLearning, you’ll find quality e-learning materials for subjects such as Physics, Chemistry, Biology, Mathematics, and Hindi. These study materials include sample papers, MIQs, textbook solutions, video lessons and more.

Understand the course structure and exam paper pattern by going through the latest CBSE Class 11 Science syllabus. With access to the accurate list of syllabus topics, you’ll be able to create an appropriate study plan for your exams. Revision is key to remembering the key concepts learned in class. Get free access to the important revision notes for CBSE Class 11 science prepared by TopperLearning’s experts. Also, improve your Hindi writing skills with textbook solutions or understand concepts in Physics with our conceptual videos.

You just need to access your TopperLearning dashboard for utilising our compiled CBSE Class 11 Science study resources such as sample papers, NCERT solutions, syllabus, videos, revision notes and online mock tests. Study complex topics as per your convenience with our 24/7 access to CBSE Class 11 Science resources and score well in your CBSE final exams for Class 11.

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CBSE XI Science - Chemistry

When lead sulphide, PbS and lead oxide, PbO, are heated together the products are lead metal and sulphur dioxide, SO2. PbS(s) + 2PbO(s)rightwards arrow with heat on top  3Pb (l) + SO2 (g). If 14.0 g of lead oxide reacts according to the above equation, how many (a) moles of lead (b) grams of lead, (c) atoms of lead and (d) grams of sulphur dioxide are formed?  (Atomic mass : Pb = 207.0, S = 32.1 ; O =16.0)

Asked by seeni2005 | 24th Feb, 2021, 12:34: PM

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CBSE XI Science - Chemistry

  1) Calculate the number of Cl2 molecules and Cl atoms in 0.25 mol of Cl2 gas. 2)  Molar mass of O is 16 g  mol-1. What is the mass of one atom and one molecule of Oxygen?  

Asked by seeni2005 | 19th Feb, 2021, 12:52: PM

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CBSE XI Science - Chemistry

Hello sir Please clarify these two sums 1) Calculate the number of Cl2 molecules and Cl atoms in 0.25 mol of Cl2 gas. 2)  Molar mass of O is 16 g  mol-1. What is the mass of one atom and one molecule of Oxygen?

Asked by seeni2005 | 17th Feb, 2021, 11:19: AM

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CBSE XI Science - Chemistry

Write electronic configuration of following elements in form of orbital notation and orbital diagram C

Asked by salvadormiranda2509 | 13th Feb, 2021, 12:53: PM

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CBSE XI Science - Biology

mention two steps of glycolysis in which ATP is utilised

Asked by mohimpathak8638 | 12th Feb, 2021, 07:41: PM

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CBSE XI Science - Chemistry

what is a bond angle 

Asked by mittalneetu345 | 12th Feb, 2021, 10:23: AM

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CBSE XI Science - Biology

Explain about ascaris lumbriocides?

Asked by khanayan1015 | 10th Feb, 2021, 12:08: PM

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CBSE XI Science - Chemistry

Hello sir, please clarify this question Does the law of multiple proportions hod true for Isotopes also? If not, why? Please explain briefly.  

Asked by seeni2005 | 8th Feb, 2021, 10:52: AM

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CBSE XI Science - Chemistry

Which type of alkane produced by decarbooxylation

Asked by archu312004 | 7th Feb, 2021, 10:21: PM

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CBSE XI Science - Mathematics

If 7th term of a G.P. is 8 times the 4th term, find the common ratio of the G.P.

Asked by minkukumarprasad94839483 | 5th Feb, 2021, 08:49: AM

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