1. Those solutions which are standardized by the titration with the primary standard solution are called a secondary standard solution.

    The examples of the secondary standard solution are:

    1. Decinormal H2SO4 solution
    2. Normal NaOH solution

  2. When, Ionic Product > Solubility product, precipitation occurs.

  3. Riemann's green is a green pigment ZnO.CoO, which is obtained by heating a mixture of zinc oxide and cobalt nitrate or by the reaction of cobalt nitrate with either  or zinc sulphate.

  4. Sigma bond is formed due to the overlapping of orbitals along their intermolecular axis. This leads to the effective overlapping and high electron density along intermolecular axis.

    On the other hand, a pi bond is formed due to the sideways overlapping of orbitals. This side-ways overlap is partial and results in low electron density in intermolecular axis.

    This is why, a sigma bond is stronger than pi bond.

  5. Option 2 is correct ans .

    Dissociation of water is an endothermic  reversible reaction.

    When temperature is increased , for an endothermic reaction in equilibrium , it shifts the equilibrium to forward direction i.e. more product is formed which in this case means : more water is dissociated ( more H+  concentration ) is obtained . Ph= negative logarithm of H+ concentration so, more H+ concentration means, lesser Ph. so , whole ph range gets changed when temperature is increased i.e at that time, our neutral point is lesser than 7 but, still water is neutral !

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