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प्रश्न
The pH of soil A is 7.5 while that of soil B is 4.5. Which of the two soils, A or B, should be treated with powdered chalk to adjust its pH and why?
उत्तर
Soil B, with a pH of 4.5, is very acidic and is thus not suitable for the normal growth of plants. Therefore, to reduce its acidity, soil B should be treated with powdered chalk (CaCO3), which is a base.
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संबंधित प्रश्न
Under what soil condition do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?
Fill in the blank in the following sentences:
Those substances whose smell (or odour) changes in acidic or basic solution are called .......................... indicators.
Which of the following types of medicine is used for treating indigestion caused by over-eating?
(a) antibiotic
(b) analgesic
(c) antacid
(d) antiseptic
The indicators which turn red in acid solution are:
(a) turmeric and litmus
(b) phenolphthalein and methyl orange
(c) litmus and methyl orange
(d) phenolphthalein and litmus
Fill in the following blank with suitable words:
The more acidic a solution, the ................. the pH.
Fresh milk has a pH of 6. When it changes into curd (yogurt), will its pH value increase or decrease? Why?
What is a universal indicator? For what purpose is it used?
The colour of methyl orange indicator in a solution is yellow. The pH of this solution is likely to be:
(a) 7
(b) less than 7
(c) 0
(d) more than 7
Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red
What will be action of solution B on litmus?
Turmeric and litmus are _________ acid-base indicators.
