Nicola Sturgeon said she believes Scotland will be independent by 2025 - amid predictions she could hold the balance of power after June 8.
The Scottish Green Party criticised the channel's decision not to include them in the debate and an STV spokeswoman said the decision was made as, under the Ofcom code, the broadcaster is required to consider historical election performance.
With the Tory lead in the polls shrinking, and with less than a week to go until the election, Ms Sturgeon said Scotland was once again "taking centre stage" in United Kingdom politics.
A spokesman for the Scottish Conservatives said: "This poll shows us up massively from the last General Election, and that we're receiving the backing of voters right across Scotland".
However Ms Sturgeon said she was "sceptical" about the prospect of a hung parliament.
"In seats across the country it is the Liberal Democrats that are set to sweep the SNP out and in these key areas people should back the Liberal Democrats to change the direction of this country and send a message to the SNP that they can not keep sweeping our problems under the carpet". Last week Mr Murray told i: "We need to work as a team to get a Labour government". So, Scotland voted No to - amongst other things - to protect its place in the EU.
"As this campaign has gone on, I think more and more people have seen what the consequences of a Tory government with an increased majority would be and they don't like that".
The SNP candidate for Paisley and Renfrewshire South, who has been the constituency MP since her headline-making victory in 2015, warned that the only way to secure free university education and youth employment in Scotland was to vote for her party.
She told BBC's Newsbeat: 'I have to try and ration myself and pull myself off of Twitter.
Draymond Green's Mom Involved In Altercation With Cavs Fans After Game 3
Of course, nothing Babers yelled, said or tweeted during the game excuses the arguments and scuffles that occurred afterwards. Even better than good behavior would be good basketball, and Green hasn't provided much in this series.
As she campaigned in Bishopbriggs, East Dunbartonshire, the First Minister said: "There is a possibility as we see the polls narrow that we could deny Theresa May a majority, and certainly deny her a bigger majority, which is why she called this election".
She also confirmed that plans to fast-track graduates into teaching roles could soon be put into place to help ease teacher shortages.
"However this year people in Scotland are not buying it".
She said teacher recruitment challenges were "not unique to Scotland".
The idea of a so-called progressive alliance involving Labour and the SNP in the event of a hung parliament is "absolute nonsense", Alistair Darling has said.
She described Theresa May as "the queen of u-turns" and said "a strong block of SNP MPs will demand that she u-turn on her austerity agenda and start investing in our public services, our businesses and our people".
Last week's Ipsos/Mori survey saw net satisfaction with how Ms Sturgeon is doing her job dip into negative territory for the first time, with 50 per cent of respondents saying they were dissatisfied compared to 46 per cent who were satisfied.
During a Question Time election special, where both Jeremy Corbyn and Theresa May faced questions from audience members on Friday evening, the Labour leader insisted he would not strike a deal with Ms Sturgeon and was working for a majority Labour government.
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