46. Who was the inventor of Atomic theory?
A. John Dalton
B. Albert Einstein
C. Rutherford
D. Madam Curie
47. What is the oxidation state of Oxygen in OF2?
A. -1
B. 1
C. 2
D. -2
48. Which one of the following is brown coal?
A. Peat
B. Lignite
C. Anthracite
D. Bituminous
49. The element radium is extracted from?
A. Rutile
B. Haematite
C. Pinch Blend
D. Limestone
50. A gaseous mixture of CO and Nitrogen is called?
A. Natural Gas
B. Water Gas
C. Coal Gas
D. Producer Gas