Chemistry
The reddish brown coloured gas formed when nitric acid reacts with carbon is
- N2O5
- N2O4
- NO2
- N2O3
Related Questions
Ammonia can be obtained by adding water to
- ammonium chloride
- ammonium nitride
- magnesium nitride
- magnesium nitrate
A few drops of universal indicator is added to four colourless solutions, A, B, C and D having pH 2, 10, 9 and 7, respectively. Which of the following test tube is labelled with incorrect colour.
- A
- B
- C
- D
2 mL of ethanoic acid was taken in test tube I and test tube II each. A red litmus paper was introduced in test tube I and a pH paper was introduced in test tube II. The experiment was performed by four students W, X, Y and Z; and they reported their observation as given in the table.
Students Action on red litmus paper Action on pH paper W Turned blue Turned pink X Remains unchanged Turned green Y Turned blue Turned blue Z Remains unchanged Turned pink Which students observation is correct?
- W
- X
- Y
- Z
In the electrolysis of alumina, cryolite is added to
- lower the melting point of alumina
- decrease the electrical conductivity
- minimize the anode effect
- remove impurities from alumina