Solid calcium oxide was taken in a container and water was added slowly to it-
(i) State two observations made in the experiment.
(ii) Write the name and the chemical formula.

Open in App

Solution

(i) Two observations made in the experiment are:-
(a) Temperature is raised due to the vigorous reaction.
(b) It is an exothermic reaction, heat is observed.

(ii) $C a O q u i c k l i m e (s) + H_{2} O w a t e r (l) ⟶ C a (O H)_{2} C a l c i u m H y d r o x i d e + Δ (h e a t)$
$∴$ Calcium Hydroxide is produced.

Suggest Corrections

Similar questions

Solid calcium oxide was taken in a container and water was added slowly to it
(i) State two observations made in the experiment.
(ii) Write the name of the chemical formula of the product.

Sarath decided to paint his house.He mixed moderate quantity of calcium oxide with water in a plastic container. He observed that the container was warm, got curious and started adding more and more of CaO in the water. What will he observe?

Q. A piece of zinc metal was dipped into a beaker containing aqueous lead(II) nitrate. After a few minutes, a grey solid was formed.
a) i) Name the grey solid.
ii) Write an ionic equation to show the formation of the grey solid.
iii) If 0.02 moles of a grey solid was formed, what mass of zinc was dissolved?
b) Name another metal which can produce the same grey solid when added to aqueous lead(II) nitrate.
c) Describe what is observed when aqueous ammonia is added slowly to the resulting solution in the beaker.

Write down the changes that will be seen in each instance and explain the reason behind it.

(a) 50ml water is added to 50ml solution of copper sulphate.

(b) Two drops of the indicator phenlphthalein were added to 10ml solution of sodium hydroxide.

(d) A litmus paper was dropped into 2ml dilute HCl. Then 2ml concentrated NaOH was added to it and stirred.

(e) Magnesium oxide was added to dilute HCl and magnesium oxide was a added to dilute NaOH.

(f) Zinc oxide was added to dilute HCl and zinc oxide was added to dilute NaOH.

(g) Dilute HCl was added to limestone.

(h) Pieces of blue vitriol were heated in a test tube. On cooling, water was added to it.

(i) Dilute H 2 SO 4 was taken in an electrolytic cell and electric current was passed through it.

Q. Write the chemical equations for the following activities.
(a) NaOH solution was added to HCI solution.
(b) Zinc dust was added to dilute