can you tell me they are true or false? It is really confusing. Thank you so much.

1.General use software is an amortizable item for a corporation

2.Dividend received deduction is fully deductible even if a corporation has a loss.

3.If a taxpayer is separated from his spouse by a decree of divorce or separate maintenance on Dec 31, he can elect joint return for the year.

4. Estimated tax payment is regarded as prepayment of tax in final tax filing.

5.Charitable contribution is fully deductible even if a corporation has a loss.