Processing math: 100%

Home / Aptitude Tests / Chemistry / The oxidation state ...

The oxidation state of Cr in K $_2$ Cr $_2$ O $_7$ is?...

The oxidation state of Cr in K $_2$ Cr $_2$ O $_7$ is?

A.

+7

B.

+6

C.

+5

D.

4

View answer & explanation

Correct answer is B

Potassium dichromate, K $_2$ Cr $_2$ O $_7$

→ [1 * 2] + [Cr * 2] + [-2 * 7] = 0

→ 2 + 2Cr - 14 = 0

→ 2Cr = 12

→Cr = $\frac{12}{2}$ → 6

See all Chemistry questions & answers

See more JAMB questions & answers

Similar Questions

Which of the curves in the above graph illustrates the behaviour of an ideal gas?...

In dilute solution the heat of the reaction NaOH + HCl = NaCl + H2O is - 57.3kJ. Therefore the heat ...

Which of the following pairs has compounds that are isomers? ...

Sodium sulphate decahydrate (Na2SO4.10 H2O) on exposure to air loses all its water of crystallizatio...

Which of the following statements is not true of halogens? ...

Sulphur (IV)oxide is a strong reducing agent in the presence of water due to the formation of ...

The fourteen elements (atomic number 90-103) after actinium are called? ...

Which of the following statements applies during the electrolysis of sodium hydroxide solution using...

Which of the following will produce a solution with pH less than 7 at equivalent point? ...

Which of the following industrial processes depends on the action of enzymes? ...

Aptitude Tests

Puzzles Questions and Answers

Typing Speed and Accuracy Test

Situational Judgement Questions and Answers

Data Interpretation Questions and Answers

Personality Test

Microsoft Office Questions and Answers

Spatial Reasoning Questions and Answers

Numerical Reasoning Questions and Answers

Verbal Reasoning Questions and Answers

Quantitative Reasoning Questions and Answers

Abstract Reasoning Questions and Answers

Logical Reasoning Questions and Answers

Nigeria General Knowledge Questions and Answers

View latest jobs in Nigeria today