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1261. Which of the following is the second most abudant metal in the earths crust ?
A. Copper
B. Aluminium
C. Iron
D. Zinc
Explanation:
1262. Which of the following is the lightest gas ?
A. Nitrogen
B. Hydrogen
C. Ammonia
D. Carbon dioxide
Explanation:
1263. In addition to the idea that matter consists of molecules, the kinetic theory of matter assumes that these molecules :
A. are perfectly stationary in solids
B. are always in motion
C. move only when strck by other molecules
D. are usually closer together in a gas than in liquid
Explanation:
1264. The high-temperature superconductors are :
A. metal alloys
B. ceramic oxides
C. inorganic polymers
D. pure rare earth metals
Explanation:
1265. The symbols used to denote different elements are generally the first or the first two letters of the name by which the particular element is commonly known. Which of the following elements do not fall in this category ? 1. Osmium 2. Tungsten3. Silver 4. Antimony
A. 1, 2 and 3
B. 1, 2 and 4
C. 2, 3 and 4
D. 1, 3 and 4
Explanation: