Chemistry
Study the reaction scheme below and then answer (a), (b) and (c) which follow :
(a) Give the chemical name and formula of (i) marble (ii) gas 'A' (iii) solid 'B'
(b) What would you expect to see (or observe) when drops of water are added to solid calcium oxide?
(c) (i) Rewrite the following sentences filling in the blanks :
Solution C is normally called ……………
When gas 'A' is bubbled through 'C'., a white precipitate of …………… is formed.
(ii) On bubbling excess of gas A through the resulting suspension, the white precipitate dissolves and then reappears on boiling. Suggest an explanation for these observations.
Related Questions
State whether the following conversations are examples of oxidation or reduction :
(a) Na ⟶ Na+ + e-
(b) PbO2 ⟶ PbSO4
Complete the following equations and state in each case if the reaction represents oxidation or reduction :
(a) Fe2+ ⟶ Fe3+
(b) Cl- ⟶ Cl
(c) Cu2+ ⟶ Cu
(d) Ag ⟶ Ag+
(e) H ⟶ H+
(f) Al ⟶ Al3+
Reactions can be classified as follows :
Direct combination, decomposition, simple displacement, double decomposition, redox (oxidation-reduction) reactions.
State which of the above types take place in the reactions given below :
(a) Cl2 + 2KI ⟶ 2KCl + I2
(b) SO2 + 2H2O + Cl2 ⟶ 2HCl + H2SO4
(c) 4HNO3 ⟶ 4NO2 + 2H2O + O2
(d) 2Mg + O2 ⟶ 2MgO
(e) AgNO3 + HCl ⟶ AgCl + HNO3
Express Kelvin Zero in °C