JEE Advanced 2012 · Paper 1

In allene (C₃H₄), the type(s) of hybridisation of the carbon atoms is (are)

1. Asp and sp³
2. Bsp and sp²
3. Conly sp²
4. Dsp² and sp³

The colour of light absorbed by an aqueous solution of CuSO₄ is

1. Aorange-red
2. Bblue-green
3. Cyellow
4. Dviolet

The carboxyl functional group (–COOH) is present in

1. Apicric acid
2. Bbarbituric acid
3. Cascorbic acid
4. Daspirin

The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is [a₀ is Bohr radius]

1. Ah²/(4π²ma₀²)
2. Bh²/(16π²ma₀²)
3. Ch²/(32π²ma₀²)
4. Dh²/(64π²ma₀²)

Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen?

1. AHNO₃, NO, NH₄Cl, N₂
2. BHNO₃, NO, N₂, NH₄Cl
3. CHNO₃, NH₄Cl, NO, N₂
4. DNO, HNO₃, NH₄Cl, N₂

As per IUPAC nomenclature, the name of the complex [Co(H₂O)₄(NH₃)₂]Cl₃ is

1. ATetraaquadiaminecobalt (III) chloride
2. BTetraaquadiamminecobalt (III) chloride
3. CDiaminetetraaquacobalt (III) chloride
4. DDiamminetetraaquacobalt (III) chloride

Choose the correct reason(s) for the stability of the lyophobic colloidal particles.

1. APreferential adsorption of ions on their surface from the solution
2. BPreferential adsorption of solvent on their surface from the solution
3. CAttraction between different particles having opposite charges on their surface
4. DPotential difference between the fixed layer and the diffused layer of opposite charges around the colloidal particles

Which of the following hydrogen halides react(s) with AgNO₃(aq) to give a precipitate that dissolves in Na₂S₂O₃(aq) ?

1. AHCl
2. BHF
3. CHBr
4. DHI