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What to do in free time?(Productive and Effective) What to do in free time?(Productive and Effective) What to do in free time?(Productive and Effective) People always ask each other : Hey what are you doing this summer? How will you use your free time ? Some people get bored in their free time so they take up activities such as chatting with their mates , hanging out 24 x 7 on social media sites like insta , facebook , making up their contacts and what not. Some of the geeky ones in their free time involve themselves in doing some tech works , grooming up their skills and galvanizing others to follow their examples. People always cherish the time when they are free i.e. when they do not have any work to do but have a lot of time which they could spend superfluously .  But we all know that time once gone doesn't come back . Don't you think the same ? I have got a lot of experiences on which I could just keep on bragging and explaining how I lost

     JEE Mains -Mole Concept and Stoichiometry Previous Year Questions (with Answers)   JEE Mains - Mole Concept and Stoichiometry Previous Year Questions (with Answers)                                                             JEE Mains -Mole Concept and Stoichiometry Previous Year Questions (with Answers) These are Jee Mains previous year questions for chemistry - MOLE CONCEPT, BALANCING OF REDOX REACTION and STOICHIOMETRY 1.        25 ml of a solution of barium hydroxide on titration with 0 .1 molar solution of hydrochloric acid gave a litre value of 35 ml. The molarity of barium hydroxide solution was  (1) 0.14   (2) 0.28 (3) 0.35 (4) 0.07                                                                                    (MAINS-2003) Ans :   (4.) 2.        The ammonia evolved from the treatment of 0.30 g of an organic compound for the estimation of nitrogen was passed in 100 mL of 0.1 M sulphuric acid. The excess of acid required 20 mL of 0.5 M sodium h

Solid state previous year questions CBSE with answers( Two and Three Mark ) Solid state previous year questions CBSE with answers( Two and Three Mark ) These are Solid   State   previous year questions for CBSE . Two Marks Question: 1.        An element having bcc structure has atomic mass 50u and density 6.81 gcm -3 Calculate the edge length of the unit cell. (N A =6.02 * 10 23 mol -1 )                                                                             (AI 2001 C) 2.        Unit cell of an element (atomic mass 108u and density 10.5g cm -3 )has an edge length 409pm Deduce the type of crystal lattice . (N A =6.02 * 10 23 mol -1 ) 3.        Nacl crystals are doped with 2*10 -3 mol percent of SrCl 2 , calculate the cation vacancies per mole. (N A   =6.02 * 10 23 mol -1 ) (Delhi 2001C) 4.        Lithium metal crystal has body centred   cubic structures   density is 0 53 g cm -3 and   its atomic mass is 6.94 g mol -1 .Calculate the volume   o