Chemical reactions and Acids, bases and Salts

Which is a base and not an alkali?

• NaOH

• KOH

• Fe(OH)₃

• None is true

Acids gives

• OH− in water

• Both the above

• None of these

• H+ in water

Caustic soda is the common name for

• NaOH

• Ca(OH)2

• Mg(OH)2

• KOH

The raw materials required for the manufacture of by Solvay process are

• CaCl2,(NH4)2CO3,NH3

• NaCl,NH3,CaCO3,H2O

• NH4Cl,NaCl2Ca(OH)2

• NaCl2,(NH4)2CO3,NH3

Chemical formula of baking soda is

• MgCO3

• NaHCO3

• MgSO4

• Na2CO3

Which type of ions are produced by bases when they are mixed with water?

• OH^-

• H⁺

• H₂O

• HCl

A weak base will have a pH close to

• 8

• 6

• 0

• 14

A very strong acid will have a pH of

• 0

• 14

• 5

• 9

An aqueous solution turns red litmus blue, excess addition of which of the following would reverse the change?

• baking powder

• lime

• ammonium hydroxide solution

• HCL

Sodium hydrogen carbonate when added to acetic acid evolves a gas . Which of the statement is true about the gas evolved?

• it turns lime water milky

• it burns with a pop sound

• it changes the solution colourless

• it has a pungent smell