[07.06] which of the following chemical reactions is an oxidation-reduction reaction? (2 points) wo3 + 3h2 yields w + 3h2o kno3 + licl yields lino3 + kcl caso4 + 2nacl yields na2so4 + cacl2 mg(no3)2 + 2hbr yields mgbr2 + 2hno3

Oxidation reduction reaction or redox reactions are those in which there is change in oxidation number of any element

In general oxidation is defined as gain of oxygen or loss of electron or hydrogen by an atom. Reduction is defined as gain of electron or hydrogen or loss of oxygen by an atom.

Let us consider each reaction one by one

1)

Here the oxidation number of W changes from +6 to 0 [reduction]

The oxidation number of H changes from 0 to +1 [oxidation]

Hence it is an oxidation reduction reaction

2)

Here there is no change in oxidation number of either element hence it is not oxidation reduction reaction

3)

Here there is no change in oxidation number of either element hence it is not oxidation reduction reaction

4)

Here there is no change in oxidation number of either element hence it is not oxidation reduction reaction

answer: c.

explanation:

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.