ISC syllabus 2025 features a marking scheme and exam sample for each of the subjects. Pupils need to get nicely acquainted Using the ISC syllabus class 12 to attain nicely in the ultimate board examination.
Reply: The molecular orbital formed via the subtractive impact with the electron waves on the combining atomic orbitals, is called antibonding molecular orbital.
Explanation: A switch controls the stream of existing in a circuit by developing or breaking the link. It doesn’t make a difference if it’s linked to the neutral or Are living wire; The real key is completing or interrupting the circuit. The Operating of swap isn't depending on the potential of Neutral wire.
(b)The best increase in ionization enthalpy is seasoned on removal of electrons from Main noble gas configuration.
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A various bond is handled as if it is one bond as well as remaining electron pairs which constitute the bond can be considered to be single Tremendous pair.
Problem four. Name different blocks of factors in the periodic desk. Give standard electronic configuration of each block.
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Issue two. Present by a chemical response with drinking water that Na20 can be a simple oxide and Cl207 is an acidic oxide.
Answer: The electron pair linked to sharing amongst two atoms for the duration of covalent bonding is called shared pair or bond pair. Concurrently, the electron pair which isn't involved in sharing known as lone pair of electrons.
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Solution: (i) In case of h2o hydrogen bonding brings about association of your H2O molecules. There is not any this sort of hydrogen bonding in H2S, that’s why It's a fuel.