|
|
| 1 |
Ammonium sulphate is the only source of nitrogen in a certain brand of fertilizer. If 15.0% by mass of the fertilizer is nitrogen, what is the mass of ammonium sulphate required to make 1000 kg of the fertilizer?
( relative atomic mass: H=1.0, N=14.0, O=16.0, S=32.0 ) |
|
|
|
219kg |
|
|
|
355kg |
|
|
|
708kg |
|
|
|
985kg |
|
|
|
|
|
|
| 2 |
A certain fertilizer is made up of ammonium sulphate only. It contains 90.0% by mass of ammonium sulphate. The rest are impurities. What is the percentage by mass of nitrogen in the fertilizer?
( relative atomic mass: H=1.0, N=14.0, O=16.0, S=32.0 ) |
|
|
|
9.6% |
|
|
|
19.1% |
|
|
|
20.2% |
|
|
|
33.2% |
|
|
|
|
|
|
| 3 |
The cost of diammonium hydrogenphosphate is $140 per kg. What is the cost of 1 kg of nitrogen in this compound?
( relative atomic mass: H=1.0, N=14.0, O=16.0, P=31.0 ) |
|
|
|
$150 |
|
|
|
$220 |
|
|
|
$450 |
|
|
|
$660 |
|
|
|
|
|
|
| 4 |
Which of the following is not a property of ammonia? |
|
|
|
It is colourless |
|
|
|
It is toxic |
|
|
|
It is an alkaline gas |
|
|
|
It is denser than air |
|
|
|
|
|
|
| 5 |
Which of the following is not a use of ammonia? |
|
|
|
As a preservative |
|
|
|
As a cleansing agent |
|
|
|
Making the nitric acid |
|
|
|
Making the fertilizer |
|
|
|
|
|
|
| 6 |
Which of the following statements concerning the Haber process is correct? |
|
|
|
The reaction between nitrogen and hydrogen is reversible |
|
|
|
The percentage yield of ammonia is about 50% |
|
|
|
Same number of moles of nitrogen and hydrogen are mixed |
|
|
|
The mixture is passed in the catalytic chamber under atmospheric condition |
|
|
|
|
|
|
| 7 |
Which of the following are the suitable conditions for the Haber process? |
|
|
|
10atm, 500K, iron as the catalyst |
|
|
|
100atm, 1000K, iron as the catalyst |
|
|
|
200atm, 737K, iron as the catalyst |
|
|
|
200atm, 500K, iron as the catalyst |
|
|
|
|
|
|
| 8 |
Which of the following is not a common use of the nitric acid? |
|
|
|
Making nylon |
|
|
|
Making paints |
|
|
|
Making drugs |
|
|
|
Making fertilizers |
|
|
|
|
|
|
| 9 |
Which of the following elements, when burnt in air, forms an oxide which is used in the making of an important acid? |
|
|
|
Copper |
|
|
|
Sulphur |
|
|
|
Iron |
|
|
|
Nitrogen |
|
|
|
|
|
|
| 10 |
A plant producing fertilizer needs to make 264 tonnes of the ammonium sulphate per month. What mass of ammonia is required for production each month?
( relative atomic mass: H=1.0, N=14.0, O=16.0, S=32.0 ) |
|
|
|
15.0 tonnes |
|
|
|
30.0 tonnes |
|
|
|
50.0 tonnes |
|
|
|
68.0 tonnes |
|
|
|
|
|
|
| 11 |
Which of the following nutrients is necessary for the formation of amino acids in plant? |
|
|
|
P |
|
|
|
N |
|
|
|
K |
|
|
|
Ca |
|
|
|
|
|
|
| 12 |
Which of the following are the reasons for using nitrates and ammonium salts as fertilizers?
1. They are easier to handle
2. They consists of more nitrogen
3. They are insoluble in water |
|
|
|
1 and 2 |
|
|
|
1 and 3 |
|
|
|
2 and 3 |
|
|
|
all the options |
|
|
|
|
|
|
| 13 |
In the Laboratory, ammonium sulphate is usually prepared by |
|
|
|
liquid ammonia and concentrated sulphuric acid |
|
|
|
ammonia solution and dilute sulphuric acid |
|
|
|
ammonia solution and sodium sulphate |
|
|
|
ammonium chloride and sodium sulphate solution |
|
|
|
|
|
|
| 14 |
X gives out a gas when heated with dilute sodium hydroxide. X gives out a different gas when reacted with dilute hydrochloric acid. What is X? |
|
|
|
ammonium sulphate |
|
|
|
ammonium chloride |
|
|
|
ammonium carbonate |
|
|
|
sodium sulphite |
|
|
|
|
|
|
| 15 |
Ammonium carbonate and sodium carbonate can be distinguished by |
|
|
|
their smell |
|
|
|
using red litmus paper |
|
|
|
using sodium hydroxide solution |
|
|
|
all the methods listed above |
|
|
|
|
|
|