Explain the exceptions in Section 494.
The exceptions to Section 494 are as follows: This section does not apply to a person whose marriage with such husband or wife has been declared void by a Court of competent jurisdiction. It also doesn't apply to a person who contracts a marriage during the life of a former husband or wife if, at the time of the subsequent marriage, the former spouse has been continually absent for seven years and has not been heard of as being alive within that time. The person contracting the subsequent marriage must inform the other party of the real state of facts before the marriage takes place.