The cordial "handshake" came barely weeks after the duo had been locked in a bitter war of words over Gujarat elections.
Former telecom minister A Raja and DMK MP Kanimozhi were on December 21 acquitted by a special court in the 2G spectrum scam case.
Both Houses of Parliament were repeatedly disrupted over the past week on the issue, with the Opposition demanding an explanation from PM Modi over his "conspiracy with Pak" remarks and seeking an apology.
Speaking in the Rajya Sabha, Jaitley said the perception that PM Modi had insinuated a collusion between Manmohan Singh and Pakistani officials was “erroneous”.
Continuing its protests for the fourth straight day, belligerent Congress members trooped into the Well during the Question Hour and raised slogans, even as Speaker Sumitra Mahajan went ahead with the proceedings.
"I do not want to boast (about) anything. The court's judgement has to be respected. I am glad that the court has pronounced unambiguously. All the massive propaganda which was being done against the UPA was without any foundation. The judgement speaks for itself," Singh said.
The Congress' central election authority (CEA) handed him over the certificate of his elevation to the top post during a grand event held at the lawns of the All India Congress Committee (AICC) headquarters here.
The House witnessed two adjournments in the morning of the first day of the Winter Session. While it saw an adjournment for 20 minutes till noon in the beginning after opposition uproar over disqualification of rebel JD-U leaders Sharad Yadav and Ali Anwar Ansari, the second one was over the Prime Minister's remarks.
Upping the ante two days after his sharp outburst, Singh put out a video message to attack Modi and said it was unfair to question the nationalism of public servants.
Pawar criticised Modi for "deliberately" misconstruing the dinner meeting at Mani Shankar Aiyar's residence on December 6 and presenting it as a conspiracy by Pakistan to interfere in the Gujarat polls.
The prime minister had insinuated that Manmohan Singh was colluding with Pakistan in the Gujarat polls. The former premier responded by saying Modi was setting a "dangerous precedent" and asked him to apologise to the nation.
Modi had stirred a hornet's note with his remarks at an election rally over a meeting between Congress leaders and a Pakistani delegation.
Rejecting the charge as "innuendos and falsehoods", Singh said he was deeply pained by the prime minister's "ill thought transgression".
"Someone who served at a high position in the Air Force has said that after 26/11, they went to the then prime minister with a plan for surgical strikes. Sadly, the then government did not show the courage to do that," Modi said and cited the example of his government's action in the aftermath of the Uri terror attack in September last year.
Accompanied by her mother Sonia Gandhi, Singh and other senior Congress leaders, Rahul Gandhi will file his nomination papers for the election to the top Congress post tomorrow, the last date for filing of nominations.
Manmohan Singh added that he was not a prophet to foresee whether the people's anger against the BJP-led Central government's decision to implement GST and demonetisation would be reflected in the election.
The former prime minister said that the government needed to make a 'frank admission' of its problems.
Speaking to businessmen in Gujarat, Singh said that demonetisation and the shoddy implementation of the GST had pushed millions of Indians into terrible hardship.
His visit comes a day before Congress vice-president Rahul Gandhi's likely tour of Surat as the Congress marks the first demonetisation anniversary on November 8 as 'black day'.
He further said that Prime Minister Narendra Modi must admit that demonetisation was a blunder and called for consensual policy decisions to rebuild the economy.
"The policy planning group will visit Jammu and Kashmir next month. The group will arrive in Srinagar on November 10," Jammu and Kashmir Congress president G A Mir told PTI.
Better known as the father of Indian liberalisation, former PM Manmohan Singh helmed the UPA that winded up as amongst the most disliked governments.
Prime Minister Narendra Modi had announced on November 8 last year scrapping of Rs 500 and Rs 1000 currency notes.
The 'sabha virasat bachao sammelan' in Delhi's Constitution Club is being seen as a show of strength by the Sharad Yadav-group in its fight against Bihar chief minister Nitish Kumar to wrest control of the party.
The PLSI is a comprehensive survey of all living languages of India carried out by a large team comprising volunteers, field activists and experts under G N Devy, the chairman and chief editor of the mammoth study.