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Sample paper 2020
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Q16 of 37 Page 1

Assertion: The two strands in double strand helix structure of DNA are complementary to each other

Reason: Disulphide bonds are formed between specific pairs of bases


DNA is a double stranded helical molecule. The 2 strands are complementary to each other and the bases in DNA are joined or held in position by hydrogen bondings.



Double helical structure of DNA

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Predict the number of ions produced per formula unit in an aqueous solution of [Co(en)3]Cl3


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Assertion: Glucose reacts with hydroxylamine to form an oxime and also adds a molecule of hydrogen cyanide to give cyanohydrin.

Reason: The carbonyl group is present in the open chain structure of glucose.


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Assertion: The acidic strength of halogen acids varies in the order HF>HCl>HBr>HI

Reason: The bond dissociation enthalpy of halogen acids decreases in the order HF>HCl>HBr>HI


Questions · 37
Sample paper 2020
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