Advertisements
Advertisements
प्रश्न
A student prepared 20% sodium hydroxide solution in a beaker containing water. The observations noted by him are given below.
I. Sodium hydroxide is in the form of pellets.
II. It dissolves in water readily.
III. The beaker appears cold when touched from outside.
IV. The red litmus paper turns blue when dipped into the solution.
The correct observations are:
(A) I, II, and III
(B) II, III and IV
(C) III, IV and I
(D) I, II and IV
उत्तर
(D)
Sodium hydroxide is in the form of pallets and it readily dissolves in water to form a solution. As it is basic in nature, it turns red litmus paper blue.
APPEARS IN
संबंधित प्रश्न
We need 20% aqueous solution of sodium hydroxide for the study of saponification reaction. When we open the lid of the bottle containing solid sodium hydroxide we observe it in which form?
(A) Colourless transparent beads
(B) Small white beads
(C) White pellets/flakes
(D) Fine white powder
Write the chemical name and formula of caustic soda.
The electrolysis of an aqueous solution of sodium chloride gives us three products. Name them.
During the electrolysis of a saturated solution of sodium chloride, where is:
hydrogen formed?
During the electrolysis of a saturated solution of sodium chloride, where is:
sodium hydroxide formed?
Answer the following question:
List the important products of the Chlor-alkali process. Write one important use of each.
An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
Sodium hydroxide turns phenolphthalein solution.
The Salt Story
From: The New Indian Express 9 March 2021
The salt pans in Marakkanam, a port town about 120 km from Chennai are the third largest producer of salt in Tamil Nadu. Separation of salt from water is a laborious process and the salt obtained is used as raw materials for manufacture of various sodium compounds.
One such compound is Sodium hydrogen carbonate, used in baking, as an antacid and in soda acid fire extinguishers.
The table shows the mass of various compounds obtained when 1litre of sea water is evaporated.
| COMPOUND | FORMULA | MASS OF SOLID PRESENT /g |
| Sodium Chloride | NaCl | 28.0 |
| Magnesium Chloride | MgCl2 | 8.0 |
| Magnesium Sulphate | MgSO4 | 6.0 |
| Calcium Sulphate | CaSO4 | 2.0 |
| Calcium Carbonate | CaCO3 | 1.0 |
| TOTAL AMOUNT OF SALT OBTAINED | 45.0 | |
What is the saturated solution of Sodium Chloride called?
Sodium hydroxide is termed an alkali while Ferric hydroxide is not because ______.
