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प्रश्न
Compare the effect of soaps and detergents on hard water.
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उत्तर
Water that contains and ions is called hard water. When soap is added to hard water, insoluble compounds form which appears as sticky scum. This scum leaves a deposit on clothes, skin, and hair. You could have a ring around the collar. Detergents have replaced soap for many cleaning jobs around the home.
The development of synthetic detergents by chemists was a great advantage for people with relatively hard tap water in their homes.
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संबंधित प्रश्न
Name the gas produced when steam is passed over hot coke.
Give the molecular formula of water ?
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 |
Give one word for the following statement:
Water fit for human consumption .
Give balanced chemical equations to show the reaction between Magnesium and water.
Give a reason why alcohol and water form a miscible mixture while oil & water do not.
Select the correct answer of the following statement:
A decahydrate crystal.
From where do the following usually get water? In which form is water present in them?
Animals
What is water?
Look at the figure.
Write down activities shown in this figure in which water is being used.
