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Which of the following statements is/are correct regarding Article 143 of the Indian Constitution?

1. It allows the cabinet ministers to seek the opinion of the Supreme Court for legal advice on questions of law or fact that are of public importance.
2. The opinion given by the Supreme Court under Article 143 is binding on President.
3. The Supreme Court may refuse to answer a reference made under Article 143.
4. It empowers the President to refer matters of public importance to the Supreme Court.
 

With reference to the recent global carbon tax imposed on the shipping industry, consider the following statements.
1. The tax was introduced under the framework of the United Nations Framework Convention on Climate Change (UNFCCC).
2. The revenues from this tax will be used exclusively for decarbonising the maritime sector.
3. The measure is expected to reduce shipping emissions by at least 60% by 2030.
4. India supported the adoption of this carbon pricing mechanism.

How many of the above statements are correct?

The U.S. and Iran have started talks about the latter’s controversial nuclear programme. In this context, which of the following statements are correct?
1. Iran, a signatory of the Nuclear Non-Proliferation Treaty (NPT), ceased to cooperate with the International Atomic Energy Agency after the 1979 revolution.
2. The 2015 Iran nuclear deal (JCPOA), between Tehran, UN Security Council, and the European Union, provided a short-lived solution to the nuclear crisis.
3. U.S. pulled out of the deal in May 2018, and reimposed sanctions on Iran.