Q. The valency of an element depends upon the -
1) Total number of protons in an atom
2) Mass number of an atom
3) Total number of neutrons in an atom
4) Total number of electrons in the outer most shell of an atom
Q. Molecules of which of the following has cage like structure ?
1. Diamond
2. Graphite
3. Fullerenes
Select the correct answer using the code given below :
1) 1, 2 and 3
2) 2 and 3 only
3) 2 only
4) 3 only
Q. Temporary hardness in water is due to which one of the following of Calcium and Magnesium?
1) Hydrogencarbonates
2) Carbonates
3) Chiorides
4) Sulphates
Q. Which one of the following elements is least reactive with water?
1) Lithium
2) Sodium
3) potassium
4) Cesium
Q. Rutherford's alpha-particle scattering experiment was responsible for the discovery of -
1) Electron
2) Proton
3) Nucleus
4) Helium
Q. How many orbiting electron does the germanium atom have?
1) 4
2) 41
3) 14
4) 32
Q. Intrinsic semiconductor material is charaterized by a valence shell of how many electrons ?
1) 1
2) 6
3) 2
4) 4
Q. The diffused impurities with how many valence electrons are called donor atoms?
1) 4
2) 3
3) 0
4) 5
Q. Zinc is used to protect iron from corrosion because zinc is -
1) more electropositive than iron
2) cheaper than iron
3) a bluish white metal
4) a good conductor of heat and electricity
Q. Which one of the following gases is placed second in respect of abundance in the Earth's atmosphere?
1) Oxygen
2) Hydrogen
3) Nitrogen
4) Carbon dioxide
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