MEDIUM
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Conc. H2SO4 chars paper, wood and sugar because it removes (water molecules/ cellulose) from them.

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Important Questions on Elements of Groups 16, 17 and 18

EASY
Which of the following oxoacid of sulphur has OO linkage?
MEDIUM

Which of the following statements is correct?

EASY
What is the precursor which is diluted to make H2SO4?
MEDIUM
In which pair of ions do both the species contain S-S bond?
EASY
Hot concentrated sulphuric acid on reaction with which one of the following elements, produces two gaseous products?
EASY
The structure of Marshall's acid among the following is:
EASY

Match List-I with List-II :

  List-I   List-II
  Industrial process   Application
(a) Haber's process (i) HNO3 synthesis
(b) Ostwald's process (ii) Aluminium extraction
(c) Contact process (iii) NH3 synthesis
(d) Hall-Heroult process (iv) H2SO4 synthesis

 Choose the correct answer from the options given below:

MEDIUM
The oxoacid of sulphur that does not contain bond between sulphur atom is:
HARD
The number of bonds between sulphur and oxygen atoms in S2O82- and the number of bonds between sulphur and sulphur atoms in rhombic sulphur, respectively are:
MEDIUM
The correct sequence of decreasing number of π -bonds in the structure of H2SO3, H2SO4 and H2S2O7 is:
EASY
On treating a compound with warm dil. H2SO4, gas X is evolved which turns K2Cr2O7 paper acidified with dil. H2SO4 to a green compound YX and Y respectively are :
MEDIUM
Which of the following oxyacid of sulphur contains S=S linkage?
MEDIUM
The number of S=O bonds present in sulphurous acid, peroxodisulphuric acid and pyrosulphuric acid, respectively are :
HARD
Write the conditions to maximise the yield of H2SO4 by contact process.
MEDIUM
The catalyst used in the Contact Process is 
MEDIUM
The number of S=O and S-OH bonds present in peroxodisulphuric acid and pyrosulphuric acid respectively are:
EASY
In preparation of sulphuric acid from Sulphur dioxide in lead chamber process. What substance is used as a catalyst?