JEE Advanced Chemistry Test 2

Result

JEE Advanced Chemistry Test 2

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Weekly Quiz Competition

Question 1
4 / -1

Polyphosphates are used as water softening agent because they -

A
form soluble complexes with anionic species

B
precipitate anionic species

C
form soluble complexes with cationic species

D
precipitate cationic species

Solution

Complex salt of metaphosphoric acid, sodium poly meta phosphate (NaPO₃)_n is known as calgon, where n sometimes as large as 1000

2Ca²⁺ + Na₂ [Na₄(PO₃)₆] →Na₂[Ca₂ (PO₃)₆] + 4 Na⁺

2Mg²⁺ + Na₂ [Na₄ (PO₃)₆] →Na₂[Mg₂ (PO₃)₆] + 4 Na⁺

Polyphosphates are used because they form soluble complex with anionic species.
Question 2
4 / -1

Match the catalyst in column X with their use in column Y.

Column X

(a) TiCl₃

(b) FeSO₄/H₂O₂

(c) Xanthine oxidase (Mo)

(d) Ferredoxin

(e) PdCl₂

Column Y

I. Fenton's reagents for oxidizing R- OH to RCHO

II. Wacker process for converting C₂H₄ to CH₃CHO

III. Photosynthesis

IV. Ziegler - Natta catalyst in production of polythene

V. Metabolism of purines

A
a-I b-IV c-V d-III e-II

B
a-IV b-I c-V d-III e-II

C
a-II b-IV c-III d-V e-I

D
a-IV b-II c-V d-III e-I

Solution

(a) TiCl₄ is the Ziegler-Natta catalyst in production of polyethylene

(b) FeSO₄/H₂O₂ is the Fenton's regent for oxidising ROH to RCHO.

(c) Xanthine oxidase (Mo) – Metabolism of purines

(d) Ferredoxin – photosynthesis

(e) PdCl₂ – Wacker process for converting C₂H₄ to CH₃CHO.