HYDROGEN - NCERT
periodic table (Unit 3). 9.2 DIHYDROGEN, H 2 9.2.1 Occurrence Dihydrogen is the most abundant element in the universe (70% of the total mass of the universe) and is the principal element in the Property Hydrogen Deuterium Tritium Relative abundance (%) 99.985 0.0156 10–15 Relative atomic mass (g mol–1) 1.008 2.014 3.016
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www.ncert.nic.in317 Alcohols, Phenols and Ethers Allylic and benzylic alcohols may be primary, secondary or tertiary. (ii) Compounds containing C OHsp2 − bond: These alcohols contain —OH group bonded to a carbon-carbon double bond i.e., to a
Model Question Paper Mathematics Class XII
www.ncert.nic.inModel Question Paper Mathematics Class XII Time Allowed : 3 hours Max: Marks: 100 General Instructions (i) The question paper consists of three parts A, B and C.
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www.ncert.nic.inPriority Areas : Fellowship will be given for research pertaining to the following priority areas: Rashtriya Madhyamik Shiksha Abhiyan (RMSA) : This scheme was launched in March, 2009 with the objective to enhance access to secondary education and to improve its quality.
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