+4
+5
+6
+7
Correct answer is C
2 atoms of Cr,
7 X -2 atoms of O
2Cr - 14 = -2
2Cr = -2 + 14
2Cr = 12
Cr = 6
Crude copper can be purified by the electrolysis of CuSO4(aq) if?...
Which of the following modes of motion is exhibited by the particles of a solid? ...
0.0075 mole of calcium trioxocarbonate (IV) is added to 0.015 mole of a solution of hydrochloric aci...
The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the f...
When copper (ll) chloride solution is treated with excess aqueous ammonia, a deep blue solution resu...
Which of the following procedures is suitable for identifying the food colouring added to a pastry s...
30cm3 of hydrogen was collected over water at 27°C and 780 mm Hg. If the vapour pressure of water a...
In the graph above, the activation energy of the catalyzed reaction is...
When a pressure cooker is half filled with water, and heated to boiling point, then the pressure ins...
What is the atomic number of Xenon? ...
Spatial Reasoning Questions and Answers
Quantitative Reasoning Questions and Answers
Microsoft Office Questions and Answers
Puzzles Questions and Answers
Numerical Reasoning Questions and Answers
Abstract Reasoning Questions and Answers
Data Interpretation Questions and Answers
Personality Test
Logical Reasoning Questions and Answers
Verbal Reasoning Questions and Answers
Situational Judgement Questions and Answers
Typing Speed and Accuracy Test
Nigeria General Knowledge Questions and Answers
See all →