Q1.This section contians 8 Questions of multiple choice /filll in the blanks/true/false .Match correct answer type questions. Attempt all parts of this section.
i.The colour of eriochrome black-T indicator at pH10
a)blue b)wine red c)red d)colourless
ii.equivalent weight of OH- is
a)18 b)17 c)16 d)none of these.
the oxidation state of Cr in K2Cr2O7-------------------------------------------
iii. Unit of hardness is expresed in terms of -----------------------
iv. The reddish brown precipitate obtained in Argentimetric titration ---------------------------.
v. Mohr's method is used for determination of ferrous ion (True/False)
vi. DIlute mineral acid is used for removal of chlorine from bleaching powder (True/False).
vii. Na2S2O3 is a primary standard solution .(True/False).
Q2. Write the procedure involved in the determination of hardness of water by complexometric titration.
OR
Write the principle involved in estimation of % of Cl2 from bleaching powder.
Q3. Why starch is to be added at the end of the titration while estimating % Cl2 in bleaching powder ?
OR
Why H2SO4 is added in the determination of ferrous content on the given ore solution ?
