Appointments of chairman and other members of UPSC comes under which article of Indian Constitution?

According to which article of the Constitution of India, the Parliament consists of President of India and the two Houses of Parliament?

In which year the British accepted the demand for making the constituent assembly of India ?

The voting age has been reduced from 21 to 18 years by the parliament by 61st Amendment Act in the year

Article 19 of the Indian Constitution is related to___.

Members of the Rajya sabha who retire every second year___.

Legally able to declare war or decide peace—

Under which article of Indian Constitution is there a provision for the formation of Finance Commission?