First this first, bitcoin can never remove any kind of poverty from a society. Poverty will exist as long as there are different class of people. If everyone becomes the same class, everything will come to a halt.
-Corruption
Corruption occurs when a system lacks transparency and efficiency. Bitcoin uses a decentralized peer-to-peer transaction system where every transaction is recorded in the system and no transaction can be made without being verified by the mediator (miners). Blockchain consists of an ongoing chain of blocks that act as ledgers for every transaction. These blocks are there for ever. The records can never be deleted or tempered. This process ensures transparency and enhances reliability.
Corruption will still exist even if bitcoins or any other crypto currency is used. We need to change the people in order to remove corruption, not the financial system. Though it will help us to minimize the corruption to some extent.
-Financial Exclusion
Financial institutes, specifically banks, at present provide a lot of useful services but with high interest rates. These services then become meaningless or unattainable for the middle class people and impossible to avail for the poorer. Hence the poor are never able to attain any of the banking or financial services due to high rates of interest. Bitcoin has a solution to this as well. Bitcoin do not require you to pay any high interests or transaction fees to avail financial services. You simply join in and have a software wallet (or any other as there a number of different wallets to keep your money). You just need to pay a very little fee on transactions otherwise no charges. Hence poor people are not excluded from the system.
Not sure what do you mean by this. You are saying they provide "useful services". What kind of services do you mean? Is it the loans you are talking about? Then how is bitcoin going to help in this case? If someone lends you bitcoin, they will be looking for interest for their own profit. The price fluctuation might also mess up everything between the lender and the borrower.