Chemistry
Which of the following is used to increase the anti-knocking property of petrol ?

Trimethyl lead
Triethyl lead
Tetramethyl lead
Tetraethyl lead

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Chemistry
Table salt gets moist during rainy season because

Sodium chloride contains some quantity of sodium iodide
Sodium chloride is hygroscopic
Sodium chloride contains hygroscopic impurities like magnesium chloride
Sodium chloride is deliquescent

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