Q. No.Which of the following is not an ore of silver?
1. Pyrargyrite
2. Argentite
3. Anglesite
4. All of the above
For which of the following metals, distillation method is used for purification ?
1. Zn
2. Cd
3. Hg
4. All of the above
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Magnesium oxide is used for the lining in steel making furnance because
1. It is reduced to Mg metal easily
2. It acts as a flux
3. It increases oxidizing power of steel
4. All of the above
Carbon cannot be used in the reduction of because
1. The enthalpy of formation of is more than that of
2. Pure carbon is not easily available
3. The enthalpy of formation of is very high
4. It is an expensive process
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Which of the following method is based on distribution law?
1. Mond's process
2. Parke's process
3. Cupellation
4. Polling process
In the blast furnace at lower temperature, following reaction take place
Compound A and B respectively are
1.
2.
3.
4. FeO and CaO
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Which of the following is not an ore of copper?
1. Chalcopyrites
2. Malachite
3. Azurite
4. Epsomite
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Which is correct match?
1. Aluminium : Calamine
2. Copper : Malachite
3. Magnesium : Bauxite
4. Zinc : Carnallite
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When iron is red heated and suddenly cooled in water then iron becomes more hard and brittle. This process is known as
1. Case hardening
2. Nitriding
3. Annealing
4. Quenching
Which of the following is the reaction of calcination?
| 1. | 2Ag + 2HCl + [O] \(\xrightarrow[]{∆}\) 2A gCl + H2O |
| 2. | 2ZnS + 3O2 \(\xrightarrow[]{∆}\) 2ZnO + 2SO2 |
| 3. | MgCO3 \(\xrightarrow[]{∆}\) MgO + CO2 |
| 4. | 2Zn + O2 \(\xrightarrow[]{∆}\) 2ZnO |
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