Advertisements
Advertisements
प्रश्न
The soil in a field is highly acidic. Name two materials which can be added to this soil to reduce its acidity. Give the reason for your choice.
Advertisements
उत्तर
The soil can be treated with bases such as quick lime (calcium oxide) or slaked lime (calcium hydroxide) to reduce its acidity. These bases react with the excess acid in the soil and neutralise it. This increases the soil pH, making it suitable for the growth of various crops.
APPEARS IN
संबंधित प्रश्न
Name one animal whose stings contain formic acid (or methanoic acid).
Which gas is usually liberated when an acid reacts with a metal? How will you test for the presence of this gas?
How will you test for the presence of this gas?
State some of the uses of mineral acids in industry.
A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing, the yellow stain turns reddish-brown. On rinsing the shirt with plenty of water, the reddish-brown stain turns yellow again.
- Name the natural indicator present in curry stain.
- Explain the changes in colour of this indicator which take place during washing and rinsing the shirt.
- What is the nature of soap (acidic/basic) as shown by the indicator present in curry stain?
What happens during a bee sting? What is its remedy?
Why is it wrong to treat a wasp sting with baking soda solution?
Write any two important uses of bases.
Name a sodium compound which is a constituent of many dry soap powders.
Do basic solutions also have H+(aq)? Why are they basic?
Write balanced equation to satisfy the following statement:
\[\ce{Acid + Sulphite or bisulphite -> Salt + water + sulphur dioxide}\]
You are supplied with five solutions: A, B, C, D and E with pH values as follows: A = 1.8, B = 7, C = 8.5, D = 13, and E = 5
Classify these solutions as neutral, slightly or strongly acidic and slightly or strongly alkaline.
Which solution would be most likely to liberate hydrogen with:
- magnesium powder,
- powdered zinc metal?
Give a word equation for each reaction.
Give the appropriate term defined by the statements given below :
The substance that releases hydronium ion as the only positive ion when dissolved in water.
Name the particles present in :
Weak electrolyte
Give the name and formula of two : Non-volatile acids
Match the acids given in column (A) with their correct source given in column (B)
| Column (A) | Column (B) |
| (a) Lactic acid | Tamarind |
| (b) Acetic acid | Lemon |
| (c) Citric acid | Vinegar |
| (d) Tartaric acid | Curd |
You are provided with four test tubes containing sugar solution, baking soda solution, tamarind solution, salt solution. Write down an activity to find the nature (acidic/basic/neutral) of each solution.
Name the acid present in the given table.
Complete the following equation.
Ca(OH)2 + ______ → ______ + H2O
