The major role of fluorspar (CaF2) which is added in small amount in the electrolytic reduction of alumina dissolved in fused cryolite (Na3AlF6 is
9%
a) as a catalyst
45%
b) to make the fused mixture very conducting
9%
c) to increase the temperature of the melt
36%
d) to decrease the rate of oxidation of carbon at the anode
Q.2.
Hydrogen gas will not reduce
12%
a) heated curic oxide
25%
b) heated ferric oxide
25%
c) heated stannic oxide
38%
d) heated aluminium oxide
Q.3.
In the alumino-thermite process, aluminiium acts as
38%
a) an oxidising agent
25%
b) a flux
38%
c) a reducing agent
0%
d) a solder
Q.4.
Type of bonds present in CuSO4.5H2O are only
0%
a) electrovalent and covalent
62%
b) electrovalent and coordinate covalent
38%
c) electrovalent, covalent and coordinate covalent
0%
d) covalent and coordinate covalent
Q.5.
Assertion : Ethyl xanthate is used as collector in froth floatation process. Reason: Collector depress the floatation property of one of the components of the ore and thus help in the separation of different minerals present in the same ore
67%
a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
22%
b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
11%
c) Assertion is true, but Reason is false
0%
d) Assertion and Reason are false
Q.6.
Iron is renderd passive by treatment with concentrated
14%
a) H2SO4
57%
b) H3PO4
0%
c) HCl
29%
d) HNO3
Q.7.
Assertion: Calcium is extracted by the electrolysis of fused CaCl2 Reason: Addition of CaF2 increases the fusioon temerature of the electrolyte
50%
a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
38%
b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
0%
c) Assertion is true, but Reason is false
12%
d) Assertion and Reason are false
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