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Chemistry Test 109
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Chemistry Test 109
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  • Question 1/10
    4 / -1

    In 500 ml of 0.2M-NaCl solution, 1500 ml of 0.4 M-MgCl2 solution is mixed. The only incorrect final concentration of ion is (assume volume to be additive) :

    Solutions

    Total volume = 500 + 1500 = 2000 ml = 2L

    Moles of [Na+] ions = 0.2 × 0.5 = 0.1

    Concentration  of [Na+] ions = 0.1/2 = 0.0M

    Moles of [Mg2+] ions = 0.4 × 1.5 = 0.6

    Concentration of [Mg2+] ions
    = 0.6/2 = 0.3M = 7.2gm/L

    Moles of [Cl–] ions = 0.2 × 0.5 + 2 × 0.4 × 1.5 = 1.3

    Concentration  of [Cl–] ions = 1.3/2  = 0.65 M

     

  • Question 2/10
    4 / -1

    Find enthalpy of neutralisation of NH4OH and HCN in aqueous solution if enthalpy of ionisation of NH4OH and HCN are 7 kJ/mol and 8 kJ/mol. also enthalpy of ionisation of H2O is 57.3 kJ/mole.

  • Question 3/10
    4 / -1

    Calculate the pH at the equivalence point in the titration of 25 mL of 0.10M formic acid with a 0.1M NaOH solution (given that pKa of formic acid = 3.74). [log2 = 0.30]

    Solutions

     

     

  • Question 4/10
    4 / -1

    Copper sulphate solution is electrolysed between two platinum electrodes. A current is passed until 1.6 g of oxygen is liberated at anode. The amount of copper deposited at the cathode during the same period is :  [At. mass of Cu = 63.6]

    Solutions

     

     

  • Question 5/10
    4 / -1

     Product (P) , Product P is :

    Solutions

     

     

  • Question 6/10
    4 / -1

    Major product (P) of given reaction will not give ?

    Solutions

    Phenol does not gives idoform test.

     

  • Question 7/10
    4 / -1

    Give the product of the following reaction sequence- 

    Solutions

     

     

  • Question 8/10
    4 / -1

    Which of the following nitrogen atom is maximum basic ?

    Solutions

    Due to +M effect of both (b) and (c).

    (a) is most basic.

     

  • Question 9/10
    4 / -1

    Which of the following is reducing carbohydrate and show mutarotation :

    Solutions

    Carbohydrates which containing Free –OH group at anomeric carbon shown reducing nature.

     

  • Question 10/10
    4 / -1

    Select correctly matched reaction with major product :

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