Given the redox reaction:
cr3+ + al--> cr + al3+
as the reaction takes place, there is a transfer of
(1) electrons from al to cr3+
(2) electrons from cr3+ to al
(3) protons from al to cr3+
(4) protons from cr3+ to al

(1) electrons from Al to

Explanation: Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.

Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.

Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.

For the given reaction:

The oxidation state of chromium reduces from +3 to 0, it is getting reduced and gains electrons. The oxidation state of aluminium increases from 0 to +3. Thus, it is getting oxidized and it loses electrons. Thus electrons are transferred from to

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explanation:

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.