Please select a subject first
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The substance which is chiefly responsible for the depletion of ozone layer is ______.
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Global warming is a phenomenon related to ______.
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Acid rain is caused by the oxides of ______.
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Intake of small quantity of methanol can be lethal. Comment.
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Catenation is the ability of an atom to form bonds with other atoms of the same element. It is exhibited by both carbon and silicon. Compare the ability of catenation of the two elements. Give reasons.
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Match the reactions given in Column (A) with the names given in column (B).
| Column (A) | Column (B) | ||
(a) |
`"CH"_3"OH" + "CH"_3"COOH"overset("H"^+)(->) "CH"_3"COOCH"_3 + "H"_2"O"` | (i) | Addition reaction |
| (b) | `"CH"_3 = "CH"_2 + "H"_2 overset("Ni")(->)"CH"_3 - "CH"_3` | (ii) | Substitution reaction |
| (c) | `"CH"_4 + "Cl"_2overset("Sunlight")(->)"CH"_3"Cl" + "HCl"` | (iii) | Neutralisation reaction |
| (d) | `"CH"_3"COOH" + "NaOH" -> "CH"_3"COONa" + "H"_2"O"` | (iv) | Esterification reaction |
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Depletion of ozone is mainly due to
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How many isomers are possible for the compound with the molecular formula C4H8? Draw the electron dot structure of branched-chain isomer.
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Gas A, found in the upper layers of the atmosphere, is a deadly poison but is essential for all living beings. The amount of this gas started declining sharply in the 1980s.
- Identify Gas A. How is it formed at higher levels of the atmosphere?
- Why is it essential for all living beings? State the cause for the depletion of this gas.
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How will you prove that C4H8 and C5H10 are homologues?
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Why is ozone layer getting depleted at the higher levels of the atmosphere? Mention one harmful effect caused by its depletion.
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In 1987, the United Nations Environment Programme (UNEP) forged an agreement to freeze the production of a certain chemical to the year 1986 level. Name the chemical and the manufacturing companies m which this chemical was being mostly used.
In what way this chemical damage -
- the upper layers of the atmosphere and ultimately
- the organisms on the earth.
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Write general formula for alkynes.
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Write the structures of two compounds having molecular formula C3H6O and give their names.
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State the essential function performed by ozone at the higher levels of the atmosphere.
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Why was there a sharp in the amount of ozone in the atmosphere in 1980’s.
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Write the chemical equation for the following:
Hydrogenation of ethene.
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Draw two structural isomers of butane.
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Draw the structure of propanol.
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Name the following:
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