Applications of Agriculture Chemistry

Q.

What do you mean by hydrolith?

Q.

List the disadvantages of using pesticides.

Q.

What is the chemical formula of Chile saltpeter?

Q.

Do algae grow at high pH?

Q.

Name two pests which damage crops?

Q.

What are the side effects of pesticides and insecticides?

Q.

Give example of an insect pest of paddy.

Q.

Is sodium bicarbonate an Arrhenius base?

Q.

Name two pest which spoil food grains in stores.

Q.

What is the need for chemical fertilizers in crop fields?

Q.

Write the formula superphosphate of lime.

Q. What are fertilizers?

Q. Name the following compound.

Q. An insecticide extracted from the leaves of neem is

1. Aldicarb
2. Malathion
3. Rotenone
4. Azadirachtin

Q. Name the most important elements required for a plant growth.

1. potassium , nitrogen, and phosphorus
2. nitrogen , mercury and hydrogen
3. zinc , lead and mercury
4. oxygen , iodine and potassium

Q.

Ammonia is a major component of :

1. Organic Acids

2. Fertilizers

3. Mineral acids

4. Acid rain

Q.

Give one harmful effect of fertilizer over manure.

Q.

In the laboratory, a steady stream of ammonia can be prepared by reaction between ammonium sulfate and an alkali.
(a) Name the alkali that is used.
(b) State whether it is necessary to heat the mixture.
(c) Write an equation for this reaction.
(d) Name the reagent used to dry the gas and explain why it is used.
(e) State how you will collect a sample of dry ammonia.

Q.

Write the chemical formula and name the element present in the sodium bicarbonate.

Q. A fertilizer which supplies only nitrogen to the soil is:

1. urea
2. organic manure
3. ammonium nitrate
4. ammonium chloride

Q. Dinesh is a farmer. He got pH of his soil tested and found out that is pH of the soil is less than 7. Which chemical should Dinesh use to make soil neutral?

1. Ammonium sulphate
2. Ammonium chloride
3. Salt
4. Calcium carbonate

Q.

Which of the following is incorrect regarding essential elements and their role in plants?

1. Chlorine: splitting of water during light reaction.

2. Magnesium: Constituent of chlorophyll.

3. Manganese: splitting of water during light reaction.

4. Sulphur: activates catalase enzyme.

Q. An example for nitrogenous fertilizer is _________.

1. potassium chloride
2. super phosphate
3. potassium sulphate
4. urea

Q.

How can you name chemical compounds from their formulae in the following cases?

Give examples in support of your answer

If the compound is base

Q. Tobacco extract and garlic extract are replaced by chemical pesticides like endosulfan. Write any two harmful effects of the use of chemical pesticides.

Q.

Question 15
Give the formulae of the compounds formed from the following sets of elements

(a) Calcium and fluorine
(b) Hydrogen and sulphur
(c) Nitrogen and hydrogen
(d) Carbon and chlorine
(e) Sodium and oxygen
(f) Carbon and oxygen

Q. Fertilizers are materials which supply only nitrogen to the soil.

1. True
2. False

Q. Which one of the following substances is used as a fertilizer?

1. $K_{2}S{O}_4.A{l}_2(S{O}_4{)}_3.24H_{2}O$
2. $Ca(CN{)}_2$
3. $Ca\left(H_{2}P{O}_4{)}_2{H}_{2}O.2\right(CaS{O}_4.2H_{2}O)$
4. $CaS{O}_4$

Q.

What to feed Hydroponic Plants?

Q. Give two examples of the following?