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Chemistry Test 95
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Chemistry Test 95
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  • Question 1/6
    4 / -1

    If the amount of radioactive substance is increased three times and simultaneously temperature also increases thrice, the number of atoms disintegrating per unit time would be -

    Solutions

    -dN/ dt = λN

     

  • Question 2/6
    4 / -1

    5 millimoles of SO2Cl2 is completely dissolved in 2 Liters of solution causing the reaction,

    SO2Cl2(aq.) + 2H2O(ℓ) —→ H2SO4 (aq.) + 2HCl(aq.) pOH of the solution is :

  • Question 3/6
    4 / -1

    What will be IUPAC name of compound when allyl and neopentyl joined together :

  • Question 4/6
    4 / -1

    A solution contains one moles each of HA & HB (both are weak acids) in one litre solution. Now one mole of NaOH is added to this solution so that both the acids are partially neutralised. Heat of neutralisation of HA & HB are –11.8 and  –12.4 kcal per mole respectively and heat produced during partial neutralisation of HA & HB is  –12.25 kcal.

    Mole ratio of neutralisation of HA & HB is - 

    Solutions

    a × 11.8 + b × 12.4 = 12.25

    a + b = 1

    a × 11.8 + (1 – a) × 12.4 = 12.25

    a = 1/4 , b = 3 / 4

    mole ratio = 1/3

     

  • Question 5/6
    4 / -1

    A solution contains one moles each of HA & HB (both are weak acids) in one litre solution. Now one mole of NaOH is added to this solution so that both the acids are partially neutralised. Heat of neutralisation of HA & HB are –11.8 and  –12.4 kcal per mole respectively and heat produced during partial neutralisation of HA & HB is  –12.25 kcal.

     

    pH of solution containing mixture of 1 mol of HA & 1 mole of HB in 1 litre solution is Ka(HA) = 1 × 10–5, Ka(HB) = 9×10–5

  • Question 6/6
    4 / -1

    Match the effect of addition of 1(M) NaOH to 100 ml of 1(M) weak acid (HA) in (List-I) with pH in ( List-II)

    List-I List-II
    (P) 25 ml of NaOH (1) Buffer solution
    (Q) 50 ml of NaOH (2) pKa + log3
    (R) 75 ml of NaOH (3) pKa – log3
    (S) 100 ml of NaOH (4) 1/2 [pKW + pKa – log2]

    The CORRECT option is 

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