Nuclear

India is not a member of the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) or the Comprehensive Nuclear Test Ban Treaty, though it is a state party to the Partial Test Ban Treaty (PTBT). New Delhi embarked on a nuclear power program in 1958 and a nuclear explosives program in 1968. The latter culminated in the test, in May 1974, of a "peaceful nuclear explosion." Following five nuclear tests in May 1998, India formally declared itself a nuclear weapon state. Reportedly, as of 2010 India had produced between 60 and 80 nuclear devices, with not more than 50 of these operational. [1] Estimates in 2010 put India's highly enriched uranium stockpile at between 0.2 and 0.5 tons, and its weapons-grade plutonium stockpile at between 0.3 and 0.7 tons. [2] Although India is increasingly concentrating on developing missiles for nuclear delivery roles, aircraft such as the Mirage 2000 and the Jaguar remain integral parts of its nuclear delivery force. [3]

India and the United States announced a nuclear cooperation initiative in July 2005 that would permit New Delhi to participate in international nuclear trade, under certain conditions. In 2008, New Delhi negotiated a limited safeguards agreement with the International Atomic Energy Agency (IAEA). [4] Subsequently, in September 2008, the Nuclear Suppliers Group removed the ban on India's participation in international nuclear trade. In October 2008, India and the United States signed a bilateral '123' nuclear cooperation agreement. India has since signed nuclear cooperation agreements with several countries, including Russia, France, Argentina, Kazakhstan, and Namibia. As of December 2011, India is working to conclude agreements to import uranium from Australia and Canada, and nuclear equipment and technology from Canada and Japan. [5]
 

Biological

Although some intelligence estimates suggest that India possesses biological weapons, there is very limited open-source information available about a possible Indian biological weapons program. India has defensive capabilities, and has conducted research on countering various diseases, including plague, brucellosis, and smallpox. India also has an extensive and advanced pharmaceutical industry, and is therefore technically capable of developing biological weapons. India ratified the Biological and Toxic Weapons Convention (BTWC) in 1974.

Chemical

After many years of denying the existence of a chemical weapons program, India disclosed in June 1997 that it possessed chemical weapons. Few details are publicly available concerning Indian chemical weapons stockpiles, though Chinese researchers have suggested that India possessed 1,000 tons of chemical weapon agents—mostly mustard agent—located at five chemical weapon production and storage facilities. Under the terms of the Chemical Weapons Convention (CWC), which India signed in 1993 and ratified in September 1996, India had destroyed approximately 75 percent of its stockpile by the end of 2006. [6] In March 2009, India announced that it had destroyed all of its chemical weapons stocks, in accordance with the CWC. [7]

Missile

For more than two decades, India has sought to develop and deploy ballistic and other types of missiles. India reportedly possessed three nuclear-capable ballistic missiles as of 2008—the Prithvi I (range 150km), the Agni I (700km), and the Agni II (2000km). [8]  The Agni II was successfully test-fired in September 2011, and the Agni I was successfully test-fired in December 2011. [9] September 2011. India successfully tested intermediate range missiles, the Agni III and Agni IV, both with ranges of more than 3000km, in February 2010 and November 2011 respectively. [10] India is expected to test its first ICBM, the Agni V with a range of more than 5000 km, by early 2012. [11] 

New Delhi has also taken steps toward achieving a submarine-launched ballistic missile (SLBM) capability, with the first test of the K-15 (Sagarika) taking place in February 2008 from a submerged barge. [12] India is also in the process of developing newer missile systems. The latest project is the Shourya (Valor), which was successfully tested in November 2008. This 600km range nuclear-capable ballistic missile is intended to enhance India's second-strike capability. [13] India is not a member of the Missile Technology Control Regime (MTCR), but in July 2005 it agreed to comply with MTCR guidelines. [14] In November 2002, New Delhi rejected a draft of the Hague Code of Conduct Against Ballistic Missile Proliferation (HCOC), which it believes is discriminatory and interferes with the peaceful uses of space technology.

India has also focused on cruise missile development in recent years, making significant progress in the development and deployment of the BrahMos supersonic cruise missile, jointly developed with Russia. [15] A second cruise missile, the Nirbhay (Fearless), was announced in 2007; this will be a sub-sonic missile with a range of 1000km, and it is due to be tested in 2012. [16] Increasingly, India is also concentrating on acquiring missile defense capabilities. Since 2006, India has tested components of its missile defense system on several occasions, with the most recent test, in March 2010, ending in failure. [17] New Delhi has discussed possible missile defense cooperation with companies and governments from the United States, Israel, and Russia. [18]
 

Sources:

[1] Robert S. Norris and Hans M. Kristensen, "Indian Nuclear Forces, 2010," Bulletin of the Atomic Scientists, September/October 2010, pp. 76-81.
[2] "Global Fissile Material Report 2010," International Panel on Fissile Materials, p. 117, fissilematerials.org.
[3] Robert S. Norris and Hans M. Kristensen, "Indian Nuclear Forces, 2010," Bulletin of the Atomic Scientists, September/October 2010, pp. 76-81.
[4] "Nuclear Verification: The Conclusion of Safeguards Agreements and Additional Protocols," (Agreement Text), International Atomic Energy Agency, 9 July 2008, www.isis-online.org.
[5] Ravi Velloor, “N-Trade for India, Japan on the Cards; Pact Being Thrashed Out, Say Sources," The Straits Times (Singapore), 24 August 2011, www.lexisnexis.com; David Fickling, “Australia Governing Party Backs End to India Uranium Export Ban,” The Wall Street Journal, 5 December 2011, www.online.wjs.com; "India Courts Canada on Nuclear Partnership," CBC News, 17 July 2011, http://www.cbc.ca.
[6] "India to Destroy Chemical Weapons Stockpile by 2009," Dominican Today, 30 December 2007, www.dominicantoday.com.
[7] "Update on Chemical Demilitarisation," Organisation for the Prohibition of Chemical Weapons, 21 April 2009, www.opcw.org.
[8] Robert S. Norris and Hans M. Kristensen, "Indian Nuclear Forces, 2010," Bulletin of the Atomic Scientists, September/October 2010, pp. 76-81.
[9 ]“India Successfully Test Fires N-Capable Agni II missile,” The Times of India, 30 September 2011, www.indiatimes.com; “India Tests Nuclear-Capable Agni-I Missile,” The Times of India, 1 December 2011, www.indiatimes.com.
[10] T.S. Subramanian and Y. Mallikarjun, "Agni-III launch a complete success," The Hindu, 7 February 2010, www.thehindu.com; Ben Doherty, “China feels India’s Nuclear Heat,” Sydney Morning Herald, 3 December 2011, www.smh.com.
[11] T.S. Subramanian and Y. Mallikarjun, "Agni-III Launch a Complete Success," The Hindu, 7 February 2010, www.thehindu.com.
[12 ] Rahul Bedi, "Sagarika Test Firing Heralds India's SLBM Capability," Jane's Navy International, 1 March 2008.
[13] Manu Pubby, "India Unveils N-Capable Shourya," The Indian Express, 13 November 2008, www.indianexpress.com; "India Test-Fires Shaurya Missile," The Hindustan Times, 12 November 2008, www.hindustantimes.com.
[14] "Arms Control and Proliferation Profile: India," Fact Sheet, Arms Control Association, November 2007, www.armscontrol.org.
[15] Josy Joseph, "Navy Wants BrahMos in Submarines," Daily News & Analysis, 21 June 2008; T.S. Subramanian, "Cruising Along," Frontline, Vol. 24, Issue 13, 30 June-13 July 2007; "Trials of BrahMos Air Version from 2012: Sivathanu Pillai," The Hindu, 5 March 2011, www.thehindu.com.
[16] Radhakrishna Rao, "India Plots First Flight for Nirbhay Cruise Missile," Flightglobal.com, 17 February 2011, www.flightglobal.com.
[17] "India's Missile Defense Test Fails," Rediff.com, 15 March 2010, www.rediff.com.
[18] Siddharth Srivastava, "India and the U.S. Talk Missile Defense," The Asia Times, 15 January 2009, www.atimes.com.