Advertisements
Advertisements
प्रश्न
Fill in the blank:
The sample of hard water which lathers with soap after boiling and filtration contains _____.
उत्तर
The sample of hard water which lathers with soap after boiling and filtration contains calcium bicarbonate.
APPEARS IN
संबंधित प्रश्न
Match the statements in column A with that in column B.
| Column A | Column B |
| (a) deliquescent substance | (1) sodium bicarbonate |
| (b) hygroscopic substance | (2) magnesium chloride |
| (c) efflorestance substance | (3) conc. sulphuric acid |
| (d) substance causing temporary hardness | (4) washing soda |
Answer the following question:
Name two gases dissolved in natural water.
How is rain produced?
What is the effect of impurities present in the water on the melting point and boiling point of water?
What are stalgmites and stalactites? How are they formed?
Give a balanced equation for the following conversion:
Potassium oxide to a strong alkali.
Name one substance which is ‘deliquescent’.
State the causes and consequences of ‘eutrophication’.
What is needed to construct a rain water harvesting pit?
Water levels in rivers increase greatly during ______.
