10 Question MCQ (including Assertion)

Assertion (A): Carbon dioxide turns lime water milky.  
Reason (R): Carbon dioxide sullies the water.

Which of the following are exothermic processes?
(i) Reaction of water with quicklime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)

The following reaction 
\(4 \mathrm{NH}_2(\mathrm{~g})+5 \mathrm{O}_2(\mathrm{~g}) \rightarrow 4 \mathrm{NO}(\mathrm{g})+6 \mathrm{H}_2 \mathrm{O}(\mathrm{g})\)
is an example of a 
(i) displacement reaction
(ii) combination reaction
(iii) redox reaction
(iv) neutralisation reaction

Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH , anhydrous \(\mathrm{CuSO}_4\) and NaCl were added to the beakers \(\mathrm{A}, \mathrm{B}\) and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B , whereas in case of beaker \(C\), the temperature of the solution falls. Which one of the following statement(s) is(are) correct?
(i) In beakers A and B , an exothermic process has occurred.
(ii) In beakers A and B , an endothermic process has occurred.
(iii) In beaker C exothermic process has occurred.
(iv) In beaker C endothermic process has occurred.

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?
(i) It is an endothermic reaction
(ii) It is an exothermic reaction
(iii) The pH of the resulting solution will be more than seven
(iv) The pH of the resulting solution will be less than seven

Which one of the following processes involve chemical reactions?

Which of the following are combination reactions?
(i) \(2 \mathrm{KClO}_3 \xrightarrow{\text { Heat }} 2 \mathrm{KCl}+3 \mathrm{O}_2\)
(ii) \(\mathrm{MgO}+\mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{Mg}(\mathrm{OH})_2\)
(iii) \(4 \mathrm{Al}+3 \mathrm{O}_2 \longrightarrow 2 \mathrm{Al}_2 \mathrm{O}_3\)
(iv) \(\mathrm{Zn}+\mathrm{FeSO}_4 \longrightarrow \mathrm{ZnSO}_4+\mathrm{Fe}\)

Assertion (A): Sodium metal is stored under  kerosene.  
Reason (R): Metallic sodium melts when exposed  to air.

Assertion (A): After white washing the walls, a shiny white finish on walls is obtained after two to  three days.  
Reason (R): Calcium oxide reacts with carbon  dioxide to form calcium hydrogen carbonate  which gives a shiny white finish.