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                     C lass 12 chapter 10 cbse important questions  1. Out of chlorobenzene and cyclohexyl chloride which one is more reactive towards nucleophilic  substitution reaction and why ?  CBSE 2019  Answer : it is due to resonance the c-cl bond in chlorobenzene having partial double bond character which makes the substitution of chlorine more difficult in chlorobenzene than in cyclohexyl chloride where the c-cl bond has pure single bond character . 2. Why is t-butyl bromide more reactive towards sn1 reaction as compare to n-butyl bromide ?cbse 19  answer : due to higher stability of tertiary carbocation then n-butyl bromide  3. why chloroform is stored in dark coloured bottles completely filled so that air is kept out ? CBSE 2110  Answer: because chloroform is slowly oxides by air and formed poisonous gas phosgene                2CHCl3 +O2 >>...

1. least distance of distinct vision for a normal eye is (a) infinity   (b) 2.5 cm            (c) 205 cm               (d) 25 Cm 2. A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power (a) +0.5 D           (b) -0.5 D     (c) +0.2 D               (d) NONE OF THESE 3. The splitting of white light into different colours on passing through a prism is called (a) reflection         (b) refraction       (c) dispersion      (d)NONE OF THESE 4. At noon, the Sun appears white as (a) blue colour is scattered the most  ...

VIDEO AND DEFINITION GIVEN BELOW WHAT IS REPRODUCTION : Reproduction is the process by which living    organisms  produce new individuals of the same species. Reproduction is not necessary to maintain the life of an organism but is necessary for life on earth  and increase in the population of a species. If organisms do not  reproduce, their population decreases and species will  become extinct.

MOTI LAL NEHRU PUBLIC SCHOOL INTRODUCTION OF ELECTRIC CURRENT .  

MOTILAL NEHRU PUBLIC SCHOOL JIND     Part last   https://youtu.be/DJian0nNLDA part 14  https://youtu.be/yZ2aWAYzyGg part 13  https://youtu.be/wOVpdjYWzwo part 12  https://youtu.be/26ZlxS-I9no part 11  https://youtu.be/mWTy_FTHGv0 part 10  https://youtu.be/W4QUwbJmEog part 9  https://youtu.be/EKPFQjuVWiE part 8  https://youtu.be/YipXmzZOzfA part 7  https://youtu.be/wtoZjMFQ_H8 part 6  https://youtu.be/5y5rnoLvWoA part 5  https://youtu.be/-eT5GZ61VmA part 4  https://youtu.be/A53BmPwS6RU part 3  https://youtu.be/625kH2PKLgY part 2  https://youtu.be/8TQ8yIYuY9E part 1 https://youtu.be/Fjxr27vWDVU

CBSE BIG CHANGES IN SYLLABUS  yellow color not in syllabus  Unit I: Chemical Substances - Nature and Behaviour Chemical reactions :  Chemical equation, Balanced chemical equation, implications of a balanced chemical equation, types of chemical reactions: combination, decomposition, displacement, double displacement, precipitation, neutralization, oxidation and reduction. Acids, bases and salts:   Their definitions in terms of furnishing of H+ and OH- ions, General properties, examples and uses, concept of pH scale (Definition relating to logarithm not required), importance of pH in everyday life; preparation and uses of sodium hydroxide, Bleaching powder, Baking soda, Washing soda and Plaster of Paris. Metals and non metals:   Properties of metals and non-metals, reactivity series, formation and properties of ionic compounds, not in syllabus   metallurgical processes, corrosion and its prevention. Carbon compounds: ...

class 12 capacitor series combination https://youtu.be/2EezZErpkiY      we can join dpp and objective question. please comments