Explanation:

• Article 120 (Language to be used in Parliament) provides for use of Hindi or English for transactions of parliament but gives the right to members of parliament to express themselves in their mother tongue. Hence, statement 1 is correct.
• Article XVII of the Indian Constitution deals with the official languages in Articles 343 to 351. Hence, statement 2 is correct.
• The Eighth Schedule recognises following 22 languages as official languages: Assamese, Bengali, Gujarati, Hindi, Kannada, Kashmiri, Konkani, Malayalam, Manipuri, Marathi, Nepali, Oriya, Punjabi, Sanskrit, Sindhi, Tamil, Telugu, Urdu, Bodo, Santhali, Maithili and Dogri.
• English is not part of languages under Eighth schedule.

Hence only statements 1&2 are correct.