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WBJEE 2015 Solved Chemistry Question Paper – Part 8

Mar 8, 2017 18:32 IST

    Find WBJEE 2015 Solved Chemistry Question Paper – Part 8 in this article. This paper consists of 5 questions (#76 to #80) from WBJEE 2015 Physics paper. Detailed solution of these questions has been provided so that students can match their solutions.

    Importance of Previous Years’ Paper:

    Previous years’ question papers help aspirants in understanding exam pattern, question format, important topics and assessing preparation. It has also been seen that sometimes questions are repeated in WBJEE Exam. So, this paper will certainly boost your confidence.

    About WBJEE Exam

    WBJEE is a common entrance examinations held at state level for admission to the Undergraduate Level Engineering and Medical courses in the State of West Bengal. The Chemistry section of WBJEE 2015 engineering entrance exam consists of 40 questions.

    76. Ionization potential values of noble gases decrease down the group with increase in atomic size. Xenon forms binary fluorides by the direct reaction of elements. Identify the correct statement(s) from below

    (A) Only the heavier noble gases form such compounds

    (B) It happens because the noble gases have higher ionization energies.

    (C) It happens because the compounds are formed with electronegative ligands.

    (D) Octet of electrons provide the stable arrangements.

    Ans : (A, C)

    Sol:

    Noble gases have higher ionization energies this is the reason why inert gases will not form compound. So, B is not correct option.

    Option D is also not possible becauses the compounds are hypervalent.

     

    77. Optical isomerism is exhibited by (ox = oxalate anion; en = ethylenediamine)

    (A) cis-[CrCl2(ox)2]3–

    (B) [Co(en)3]3+

    (C) trans-[CrCl2(ox)2]3–

    (D) [Co(ox)(en)2]+

    WBJEE 2016 Solved Physics and Chemistry Question Paper

    Ans : (A, B, D)

    Sol:

    Optical isomers are those molecules which differ three-dimensionally by the placement of substituents around one or more atoms in a molecule. Trans-[CrCl2(ox)2]3– has plane of symmetry.

    78. The increase in rate constant of a chemical reaction with increasing temperature is (are) due to the fact(s) that

    (A) the number of collisions among the reactant molecules increases with increasing temperature.

    (B) the activation energy of the reaction decreases with increasing temperature.

    (C) the concentration of the reactant molecules increases with increasing temeprature.

    (D) the number of reactant molecules acquiring the activation energy increases with increasing temperature.

    Ans : (A, D)

    Sol:

    The increase in rate constant of a chemical reaction with increasing temperature is due to the facts that:

    (i) the number of collisions among the reactant molecules increases with increasing temperature.

    (ii) the number of reactant molecules acquiring the activation energy increases with increasing temperature.

    79. Within the list shown below, the correct pair of structures of alkaline in pH ranges 2-4 and 9-11 is

    (I) H3N+ – CH(CH3)CO2H

    (II) H2N – CH(CH3)CO2

    (II) H3N+ – CH(CH3)CO2

     (IV) H2N+ – CH(CH3)CO2H

    (A) I, II

    (B) I, III

    (C) II, III

    (D) III, IV

    Ans : (A)

    Sol:

    The correct pair of structures of alkaline in pH ranges 2-4 is:

    Acidic medium H3N+ – CH(CH3)CO2H

    The correct pair of structures of alkaline in pH ranges 9-11 is:

    Basic medium H2N – CH (CH3)CO2

    WBJEE 2015, Chemistry

    Identify the correct method for the synthesis of the compound shown above from the following alternatives

    WBJEE 2015, Chemistry

    Ans: (B)

    Sol:

    WBJEE 2015, Chemistry

    Also Get:

    WBJEE Sample Papers

    WBJEE Previous Years' Question Papers

    WBJEE Online Test

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