51. Which of the following has maximum calorific value?
A. Hydrogen
B. Natural Gas
C. Gasoline
D. Charcoal
52. Oxygen and Ozone are –
A. Allotropes
B. Isotopes
C. Isobars
D. Isomers
53. Which of the following is not a mixture?
A. Toilet Soap
B. Baking Soda
C. Vinegar
D. Toothpaste
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