All categories

3 years ago

Which of the following ions is in the lowest oxidation state?

Chemistry

2 answers:

hodyreva [135]3 years ago

7 0

Answer:

B. Cr in $Cr_{2}O_{7}^{-2}$

Explanation:

Let us first find the oxidation numbers in each of the following scenarios

A. The oxidation number of P in $H_{2}PO_{4}^{-} \\$ is +5

because 2H + 4O + P = -1

2(1) +4(-2) + P = -1

P = 5

B. The oxidation number of Cr in $Cr_{2}O_{7} ]^{-2} \\$ is

2Cr + 7O = -2

2Cr + 7(-2) = -2

Cr = 6

C. The oxidation number of Fe in $Fe_{2}O_{3}$ is +3

2Fe + 3O = 0

2Fe + 3(-2) = 0

Fe = 3

The final answer is Cr

bulgar [2K]3 years ago

5 0

Answer:

I believe it is a hope this helps

You might be interested in

A sample of O2 gas (2.0 mmol) effused through a pinhole in 5.0 s. It will take __________ s for the same amount of CO2 to effuse

ludmilkaskok [199]

Answer:

$\large \boxed{\text{5.9 s}}$

Explanation:

Graham’s Law applies to the effusion of gases:

The rate of effusion (r) of a gas is inversely proportional to the square root of its molar mass (M).

$r \propto \dfrac{1}{\sqrt{M}}$

If you have two gases, the ratio of their rates of effusion is

$\dfrac{r_{2}}{r_{1}} = \sqrt{\dfrac{M_{1}}{M_{2}}}$

The time for diffusion is inversely proportional to the rate.

$\dfrac{t_{2}}{t_{1}} = \sqrt{\dfrac{M_{2}}{M_{1}}}$

Let CO₂ be Gas 1 and O₂ be Gas 2

Data:

M₁ = 44.01

M₂ = 32.00

Calculation

$\begin{array}{rcl}\dfrac{t_{2}}{t_{1}} & = & \sqrt{\dfrac{M_{2}}{M_{1}}}\\\\\dfrac{t_{2}}{\text{5 s}}& = & \sqrt{\dfrac{44.01}{32.00}}\\\\& = & \sqrt{1.375}\\t_{2}& = & \text{5 s}\times 1.173\\& = & \mathbf{5.9 s} \\\end{array}\\\text{It will take $\large \boxed{\textbf{5.9 s}}$ for the carbon dioxide to effuse.}$

4 0

3 years ago

Among the following, which element has the lowest ionization energy? Question 2 options: Cs Na Cl I

marissa [1.9K]

The element with the lowest ionization energy is CESIUM, CS.
Ionization energy is the energy required to remove the most loosely bound electron in an atom of an element. The higher the number of shells in an atom of an element, the lower the ionization energy that will be required to remove the valence electron.

7 0

3 years ago

Read 2 more answers

Which of the following are required for plants to carry out photosynthesis?

Vika [28.1K]

Answer:

Carbon dioxide, water, and sunlight

Explanation:

3 0

2 years ago

Which of the following is not part of protozoa?

Serga [27]

Answer: A. Cilla Is Correct.

4 0

3 years ago

The secondary structure of a protein is distinct from the tertiary structure of a protein mainly because the secondary structure

mixer [17]

Answer:

False

Explanation:

The primary structure of a protein refer to the amino acid sequence. The secondary structure of a protein refer to the alpha helices, beta sheets and turns, while the tertiary structure refer to folding of the sheets due to hydrogen bonding or other bonding interaction between them.

4 0

3 years ago