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JEE Main Test 41

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JEE Main Test 41
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  • Question 1
    4 / -1

    In which of the following coordination compounds does the transition metal have an oxidation number of+6?

    Solution

    K2 [ Cr(CN)2O2(O2)NH3 ]

    2 × 1 + [ x + 2(-1) + 2(-2) + 2(-1) + 0 ] = 0 ⇒ x = + 6

    The correct answer is: K2 [ Cr ( CN )2 O2 ( O2 ) NH3 ]

  • Question 2
    4 / -1

    Equal volumes of equi-molar solutions of HNO3 and H2SO4 are neutralized by dilute KOH solution and x and y are the respective enthalpy changes. Which of the following is true ?

    Solution

    H2SO4 is a dibasic acid. Equimolar equal volume of H2SO4 contains twice the number of equivalents as compared to HNO3and so also the heat produced.

    The correct answer is: 2x = y

  • Question 3
    4 / -1

     

    Find the amount of work done will be.

    Surface tension of water at 25°C is 7.2 × 10−2Nm−1. In order to increase surface area of water by 100 cm2

    Solution

    Work done = Surface energy × increase in surface area = 7.2 × 10−2×(100 × 10−4m2)=7.2 J

    The correct answer is: 7.2 J

  • Question 4
    4 / -1

    Select the process(es) that take place with increase of entropy

    Solution

    Dissolution of solid in liquid results in more randomness i.e., increase in entropy.

    Mixing of gases results in increase in entropy.

    The correct answer is: Sugar + Water  → Solution

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