91) Which of the following is a non metal?
92) Which of the following process is used for the purification of crude metal?
A) Roasting
B) Poling
C) Calcination
D) Froth flotation
93) Which one of the following metal occurs in the native form?
94) The more reactive metal in the activity series is
A) Potassium
B) Zinc
C) Iron
D) Platinum
95) The carbonate ore among the following is
A) Bauxite
B) Magnesite
C) Haematite
D) Carnalite
96) Identify an acidic flux among the following
A) SiO2
B) CaO
C) MgO
D) CaCO3
2
97) Which of the following electronic configuration violating Hund’s rule?
98) The classification of elements which is based on atomic number is
A) Dobereiner’s law of Triads
B) Newland’s law of octaves
C) Modern periodic table
D) Mandeleeff’s periodic table
99) Four quantum numbers of valence electron of sodium
A) 3,0,0,+½
B) 2,1,0,-½
C) 3,0,-1,+½
D) 2,0,0,-+½
100) Which of the following electromagnetic radiation has more frequency?
A) Cosmine rays
B) X-rays
C) U.V. rays
D) Radio waves
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