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JEE 2020 Chemistry : Practical Chemistry (12.08.2019)

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Question 1

Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown- red vapours of :

Question 2

In a complexometric titration of metal ion with ligand
M(Metal ion)+L(Ligand) → C(Complex) end point is estimated spectrophotometrically (through light absorption).
If ‘M’ and ‘C’ do not absorb light and only ‘L’ absorbs, then the titration plot between absorbed light (A) versus volume of ligand ‘L’ (V) would look like :

Question 3

When

is fused with an alkali metal hydroxide in presence of an oxidizing agent such as KNO₃ ; a dark green product is formed which disproportionates in acidic solution to afford a dark purple solution. X is :

Question 4

For standardizing NaOH solution, which of the following is used as a primary standard?

Question 5

An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination?

Question 6

When metal 'M' is treated with NaOH, a white gelatinous precipitate 'X' is obtained, which is soluble in excess of NaOH. Compound 'X' when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal 'M' is :

Question 7

In an organic compound of molar mass 108 g mol^-1 C, H and N atoms are present in 9 : 1 : 3.5 by weight. Molecular formula can be:

Question 8

Silver Mirror test is given by which one of the following compounds?

Question 9

Which of the following reagents may be used to distinguish between phenol and benzoic acid?

Question 10

Which one of the following compounds will not be soluble in sodium bicarbonate?

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Aug 12JEE & BITSAT