Q1. Asbestos is a silicate mineral of calcium and-
(a) K
(b) Cl
(c) Ba
(d) Mg
Q2. Zone refining is a method to obtain-
(a) High temperature
(b) Ultra pure oxides
(c) Ultra pure metals
(d) All of these
Q3. The reason of floating of the ore particles in concentration by froth floatation process is their-
(a) being light
(b) being insoluble
(c) being charged
(d) being hydrophobic
Q4. Calcination is the process of heating the ore?
(a) in a blast furnace
(b) in absence of air
(c) in presence of air
(d) none
Q5. Pyrolusite is-
(a) MnO
(b) Mn2O3
(c) MnO2
(d) SnO2
Q6. Silver containing lead as an impurity is removed by –
(a) Poling
(b) Cupellation
(c) Lavigation
(d) Distillation
Q7. The process of sudden cooling is known as –
(a) annealing
(b) diffusion
(c) quenching
(d) sedimentation
Q8. The metal which is generally used for the filaments of electric bulb is-
(a) Pt
(b) Fe
(c) W
(d) Cu
Q9. An important ore of iron is-
(a) pitch blende
(b) galena
(c) malachite
(d) hematite
Q10. Purification of aluminum by electrolyte refining is known as–
(a) Hoope’s process
(b) Serpeck’s process
(c) Baeyer’s process
(d) None of these
Solutions
S1. Ans.(d)
S2. Ans.(c)
S3. Ans.(d)
S4. Ans.(b)
S5. Ans.(c)
S6. Ans.(b)
S7. Ans.(c)
S8. Ans.(c)
S9. Ans.(d)
S10. Ans.(a)
