Question
Fertilizers are used to provide three of the elements needed for plant growth.
Which two compounds would give a fertilizer containing all three of these elements?
- Ca(NO3)2 and (NH4)2SO4
- Ca(NO3)2 and (NH4)3PO4
- KNO3 and (NH4)2SO4
- KNO3 and (NH4)3PO4
Answer/Explanation
Ans:
D
Question
Which statements about sulfur dioxide are correct?
- Sulfur dioxide decolourises acidified potassium manganate(VII).
- Sulfur dioxide forms when acids react with carbonates.
- Sulfur dioxide is used as a bleach.
- Sulfur dioxide is used to treat acidic soil.
A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4
Answer/Explanation
Ans:
A
Question
Which combination of chemical compounds can be used to produce the fertiliser shown?
A \((NH_4)_3PO_4, KCl\)
B \(NH_4NO_3, Ca_3(PO_4)_2\)
C \(NH_4NO_3, CO(NH_2)_2\)
D \(NH_4NO_3, K_2SO_4, (NH_4)2SO_4\)
Answer/Explanation
Ans: A
Question
Fertilisers are mixtures of different compounds used to increase the growth of crops.
Which pair of substances contain the three essential elements for plant growth?
A ammonium nitrate and calcium phosphate
B ammonium nitrate and potassium chloride
C ammonium phosphate and potassium chloride
D potassium nitrate and calcium carbonate
Answer/Explanation
Ans: C