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Acids, Bases and Salts

Nikhil Jain
23/07/2019 0 0

                                        SULPHURIC ACID

  • Why is H2SO4 not a drying agent for H2S?

Ans)     H2SO4 brings about a chemical change as well as change in chemical composition when reacted with H2S to form S02and free sulphur. Hence it is not a drying agent for H2S.

 

  • Why Sulphuric acid does forms two types of salts with NaOH?

Ans)  Sulphuric acid does forms two types of salts with NaOH since its basicity is 2.

 

NaOH+H2SO4 ---->NaHS04+H20

2NaOH+H2SO4---->Na2SO4+2H20

 

  • Write the Equation for the reaction by which Sulphur dioxide is converted is converted into Sodium Sulphite?

Ans)   S02+2NaOH---->Na2S03+H2O

 

  • Name a gas that can be oxidized to Sulphur?

Ans) H2S

Equation:   H2S+H2S04--->S+2H20+S02

 

  • What are the chemical names given to salts of Sulphurous and Sulphuric Acid?

Ans)  i) Sulphuric Acid-------Sulphate

E.g.     2KOH+H2S04---->K2SO4+2H2O

 

  1. ii) Sulphurous Acid-------Sulphite

E.g.      2NaOH+H2SO3----->Na2SO3+ 2H20

 

 

ACIDS, BASES & SALTS

 

  • What is the difference between Alkali and metal Hydroxide?

Ans) 

 

  • Define Acid/Alkali in terms of Ionisation:

Ans) 

 

  • Name the ions furnished by Weak Alkali:

Ans)

 

  • Name the Hydrogen containing compound which is not an acid:

Ans)

 

  • C2H5OH & C6H2O6 do not show Acidic while HCl & HNO3 show acidic character:

Ans)

 

  • Dry HCl gas does not change the colour of dry litmus. Why?

Ans)

 

  • Is PbO2 a base or not? Comment:

Ans)

 

  • Universal Indicator solution of different acids produce different colours, but Solution of same acid with different concentration produce different colours. Why?

Ans)

 

  • How to Form PbO2 from Pb & Mg2CO3 from MgCl2?

Ans)

 

  • Sodium Hydroxide Sulphate is not an acid but it dissolves in water to give H+ Ions, according to Eq. NAHSO4-----> H+ +Na+ + SO4-2

Ans)

 

  • Name a substance which changes the blue colour of copper sulphate to white:

Ans)

 

 

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