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Statement 1 is correct. Iltutmish was the Sultan of Delhi from 1211 to 1236, and during his reign, the Mongol ruler Chengiz Khan attacked the Khwarezmian Empire, which was located in present-day Iran and Central Asia. The Khwarezm prince, Jalal ad-Din Mingburnu, sought refuge in India, and Iltutmish allowed him to settle in India. In pursuit of the Khwarezm prince, Chengiz Khan and his forces reached the Indus River, which marks the eastern boundary of present-day Pakistan.
Statement 2 is also correct. Muhammad bin Tughlaq was the Sultan of Delhi from 1325 to 1351. In 1398, Taimur, also known as Timur or Tamerlane, a Turco-Mongol conqueror, invaded India and occupied Multan, which was then part of the Delhi Sultanate. Taimur then crossed the Indus River and proceeded to sack Delhi, which was then the capital of the Delhi Sultanate.
Statement 3 is incorrect. Deva Raya II was a ruler of the Vijayanagara Empire, which was located in the Deccan region of South India. He ruled from 1424 to 1446. Vasco da Gama, the Portuguese explorer, reached the coast of Kerala in 1498, which was more than 50 years after the death of Deva Raya II.