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 Q. During water-gas shift reaction                                                         ( JEE mains 2023) 1. carbon monoxide is oxidized to carbon dioxide.  2. carbon is oxidized to carbon monoxide 3. carbon dioxide is reduced to carbon monoxide. 4.water is evaporated in presence of catalyst. Show Answer Ans:- (1)

 Q. Which of the following statement is correct for paper chromatography?                                                         (JEE mains 2023) 1. Water present in the mobile phase gets absorbed by the paper which then forms the stationary phase. 2. Water present in the pores of the paper forms the stationary phase.  3. Paper sheet forms the stationary phase. 4.Paper and water present in its pores together form the stationary phase. Show Answer Ans: (2) Sol. In paper chromatography, a special quality paper known as chromatography paper is used. Paper contains water trapped in it, which acts as the stationary phase.

 Q. The homoleptic and octahedral complex of Co2+ and H2O has ____unpaired electron(s) in the t2g set of orbitals.                                                          (JEE mains 2023) Show Answer Ans. (1)  Sol. Co2+: 3d configuration t²²¹ e¹¹

   Q. The volume (in mL) of 0.1 M AgNO3 required for complete precipitation of chloride ions present in 20 mL of 0.01 M solution of [Cr(H2O)5Cl]Cl2 as silver chloride is                                                     (jee2023) Show Answer And: 4

    Chemistry PYQ  Q. The rate of hydrolysis of alkyl chloride improves because of better Nucleophilicity of I-. Order of Covalent bond;  A. KF > KI; LiF > KF  B. KF < KI; LiF > KF  C. SnCl4 > SnCl2; CuCl > NaCl  D. LiF > KF; CuCl < NaCl  E. KF <KI; CuCl > NaCl                                                         (jee mains 2024) 1. C, E only  2. B, C only 3. B, C, E only 4. A, B only Show Answer According to Fajan's Rule,  A. KF > KI - False; LiF > KF - True  B. KF <KI-True; LiF > KF - True  C. SnCl4 > SnCl2 - True; CuCl > NaCl - True  D. LiF > KF - True; CuCl < NaCl - False  E. KF <KI - True; CuCl > NaCl - True

  Chemistry PYQ  Q. Which of the Phosphorus oxoacid can create silver mirror from AgNO3 solution ?                                                         (jee mains 2023) 1.  (HPO3)n  2. H4P2O5 3. H4P2O6 4.H4P2O7 Show Answer Oxyacid having P-H bond can reduce AgNO3 to Ag .

  Chemistry PYQ  Q. Decreasing order of the hydrogen bonding in following forms of water is correctly represented by  A. Liquid water  B. Ice  C.Impure water                                                         (jee mains 2023) 1. A = B > C 2 . B > A > C 3. C > B > A 4.A > B > C Show Answer (2) Ice > Liquid water > Impure water  Due to impurity extent of H-Bonding decreases.

Chemistry PYQ   Q. Which of the following statements is not correct about rusting of iron?                                                         (jee mains 2023) 1. Coating of iron surface by tin prevents rusting, even if the tin coating is peeling off.  2. When pH lies above 9 or 10, rusting of iron does not take place.  3. Dissolved acidic oxides SO2, NO2 in water act as catalyst in the process of rusting. 4.Rusting of iron is envisaged as setting up of electrochemical cell on the surface of iron object. Show Answer (1) - As tin coating is peeled off, then iron is exposed to atmosphere.