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4 years ago

9

Which of the following elements is very reactive and needs to lose one electron to have a full outermost shell?

2 answers:

Elina [12.6K]4 years ago

8 0

Cesium because it is the only one that belongs to the alkali group.

Lubov Fominskaja [6]4 years ago

3 0

Xenon has no reactivity so you know it can't be that one. Lodine has very low reactivity so it also can't be that one. Both Cesium and Scandine have high reactivity so it would have to be one of these two. And since Cesium is in the alkalai group you know it has to be that one.

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2 years ago

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Data has been collected to show that at a given wavelength in a 1 cm pathlength cell, Beer's Law for the absorbance of Co2 is li

White raven [17]

Answer : The concentration of a solution with an absorbance of 0.420 is, 0.162 M

Explanation :

Using Beer-Lambert's law :

$A=\epsilon \times C\times l$

As per question, at constant path-length there is a direct relation between absorbance and concentration.

$\frac{A_1}{A_2}=\frac{C_1}{C_2}$

where,

A = absorbance of solution

C = concentration of solution

l = path length

$A_1$ = initial absorbance = 0.350

$A_2$ = final absorbance = 0.420

$C_1$ = initial concentration = 0.135 M

$C_2$ = final concentration = ?

Now put all the given value in the above relation, we get:

$\frac{0.350}{0.420}=\frac{0.135}{C_2}$

$C_2=0.162M$

Thus, the concentration of a solution with an absorbance of 0.420 is, 0.162 M

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3 years ago

During the electrolysis of cryolite ,aluminium and fluorine are formed in.......molar ratio

PtichkaEL [24]

${\huge{\boxed{\sf{\pink{☛Answer࿐}}}}}$

From the first mechanism, it can be seen that the Aluminum is reduced at cathode and Florine is oxidized at anode.

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3 years ago

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