Question Paper Chemistry Practical 2010

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 K_{2­­­­­­­}Cr₂O_{7-------------------------------------------}

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. Na₂S­₂O_­3­ 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 ?

Physics Question Paper

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