JEE Advanced Chemistry Question Paper 2020 Download Free PDF
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JEE Advanced Chemistry Question Paper 2020 Download
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Q1. Which of the following liberates O2 upon hydrolysis?
Q2. A colorless aqueous solution contains nitrates of two metals, X and Y. When it was added to an aqueous solution of NaCl, a white precipitate was formed. This precipitate was found to be partly soluble in hot water to give a residue P and a solution Q. The residue P was soluble in aq. NH3 and also in excess sodium thiosulfate. The hot solution Q gave a yellow precipitate with KI. The metals X and Y, respectively, are
(A) Ag and Pb
(B) Ag and Cd
(C) Cd and Pb
(D) Cd and Zn
Q3. Which among the following statement(s) is(are) true for the extraction of aluminium from bauxite?
(A) Hydrated Al2O3 precipitates, when CO2 is bubbled through a solution of sodium aluminate.
(B) Addition of Na3AlF6 lowers the melting point of alumina.
(C) CO2 is evolved at the anode during electrolysis.
(D) The cathode is a steel vessel with a lining of carbon.
Q4. Choose the correct statement(s) among the following.
(A) SnCl2 ×2H2O is a reducing agent.
(B) SnO2 reacts with KOH to form K2[Sn(OH)6].
(C) A solution of PbCl2 in HCl contains Pb2+and Cl−ions.
(D) The reaction of Pb3O4 with hot dilute nitric acid to give PbO2 is a redox reaction.
Q5. With respect to hypochlorite, chlorate and perchlorate ions, choose the correct statement(s).
(A) The hypochlorite ion is the strongest conjugate base.
(B) The molecular shape of only chlorate ion is influenced by the lone pair of electrons of Cl.
(C) The hypochlorite and chlorate ions disproportionate to give rise to identical set of ions.
(D) The hypochlorite ion oxidizes the sulfite ion.