Q. no. 1: Encircle the correct answer.
- Acids react with metal hydroxides to form
A.salt and hydrogen gas
B.salt and water
C.salt and alkali
D.hydrogen and oxygen
2.. When methyl orange indicator is added to a basic solution, the solution turns _.
A.colorless
B.blue
C.yellow
D.brown - Indicators are substances whose solutions change colour due to changes in _.
A.pH
B.temperature
C.density
D.pressure - HCl+NaOH→NaCl+H2O What is the type of this reaction?
A.Elimination reaction
B.Neutralisation reaction
C.Single displacement reaction
D.Combustion - When a few drops of phenolphthalein indicator are added to an acidic solution, the
solution turns _.
A.blue
B.colorless
C.violet
D.light pink
6.Zn+H2SO4→?Which of the following gases releases?
A.O2
B.SO2
C.H2S
D.H2