Chemistry · JEE Advanced

JEE Advanced 2021 · Paper 1

202160 marks19 questions

5 of its 19 questions are here. The rest have a figure or are still being checked, so for now they're only in the official PDF.

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Source: JEE (Advanced) 2021, Paper 1, Chemistry, published by JEE (Advanced). The official PDF

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5 questions

Q4Section Section 13 marks
$The calculated spin only magnetic moments of [Cr(NH₃)₆]³⁺ and [CuF₆]³⁻ in BM, respectively, are (Atomic numbers of Cr and Cu are 24 and 29, respectively)$
1. A $3.87 and 2.84$
2. B $4.90 and 1.73$
3. C $3.87 and 1.73$
4. D $4.90 and 2.84$
Q13Section Section 34 marks
$The correct statement(s) related to colloids is(are)$
1. A $The process of precipitating colloidal sol by an electrolyte is called peptization.$
2. B $Colloidal solution freezes at higher temperature than the true solution at the same concentration.$
3. C $Surfactants form micelle above critical micelle concentration (CMC). CMC depends on temperature.$
4. D $Micelles are macromolecular colloids.$
Q15Section Section 34 marks
$The correct statement(s) related to the metal extraction processes is(are)$
1. A $A mixture of PbS and PbO undergoes self-reduction to produce Pb and SO₂.$
2. B $In the extraction process of copper from copper pyrites, silica is added to produce copper silicate.$
3. C $Partial oxidation of sulphide ore of copper by roasting, followed by self-reduction produces blister copper.$
4. D $In cyanide process, zinc powder is utilized to precipitate gold from Na[Au(CN)₂].$
Q17Section Section 44 marks
$The maximum number of possible isomers (including stereoisomers) which may be formed on mono-bromination of 1-methylcyclohex-1-ene using Br₂ and UV light is ___.$
Q19Section Section 44 marks
$The total number of possible isomers for [Pt(NH₃)₄Cl₂]Br₂ is ___.$