ICSE CHEMISTRY - PRACTICE PAPER 7

ICSE CHEMISTRY - PRACTICE PAPER 7

Question 1                                                                                                                             2+3+5

a)      Define the following terms

i) Acid                         ii) Basicity of an acid

b)      Complete and balanced equations:

i)     CO₂ + H₂O à

ii)   SO₃ + H₂O à

iii)    S + HNO₃ à

c)      i) State any two uses of acids.

ii) Give any two examples of oxyacids.

iii) Strong acids dissociate completely/partially to a high concentration of hydronium ions.

Question 2

a)      i) dil.HCl turns blue litmus to ______________.                                                        4+4+2

ii) State the colour of Nitrogen dioxide.

iii) Write the electronic configuration Carbon.

iv) An element X has 2 electrons in its valence shell. Is it a metal or nonmetal?

b)      Correct the following statements and rewrite.

i) HNO₃ is an organic acid.

ii) A monobasic acid gives two Hydronium ions in its aqueous solution.

c)      i) Metal oxides dissolve in water to produce bases/acids.

ii) The basicity of a dibasic acid is _________.

iii) Citric acid is an inorganic/organic acid.

iv) Organic acids are strong/weak acids.