chemistry most important questions for class 12th : बोर्ड परीक्षा 2021 के लिए

CHEMISTRY MOST IMPORTANT QUESTIONS FOR CLASS 12TH 

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TOP – 30 QUESTIONS :


1]. Explain analgesics and write any two example .


2]. write down the names of four medicinal plants and diseases cured by them ?


3].draw the diagram of caesium chloride and describe the structure brief ?


4]. write differences between positive and negative deviation ?


5]. what is the differences between physical and chemical adsorption ?


6]. give the manufacture of nitric acid by ostwald process with labelled diagram and equation involved in the reaction ?


7]. what are interhalogen compounds ? give the structures of two interhalogen compounds ?


8]. give the main differences between d and f-block elements ?


9]. what are transition elements ? in how many series are they divided ? explain .


10]. haloarenes are less reactive than haloalkanes , why ? explain .


11]. write the differences between aldehyde and ketone ?


12]. write four differences between DNA and RNA .


13]. what are carbohydrates ? give types of carbohydrates .


14]. what are preservatives ? give any two examples with name and formula ?


15]. write differences between ideal and non ideal solution ?


16]. what is standard hydrogen electrode ? how is it prepared ?


17]. define :-

peptization

coagulation


18]. write any four differences between phenols and alcohol ?


19]. write the laboratory method of preparation of acetone . give chemical equation and labelled diagram of the process ?


20]. explain the following reactions :-

carbylamine reaction

hoffman’s bromide reaction

mustard oil reaction 


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