Q. No.
"Metals are usually not found as nitrates in their ores". Out of the following two (a and b) reasons which is/are true for the above observation?
I. Metal nitrates are highly unstable.
II. Metal nitrates are highly soluble in water.
1. I and II are true
2. I and II are false
3. I is false but II is true
4. I is true but II is false
I. Metal nitrates are highly unstable.
II. Metal nitrates are highly soluble in water.
2. I and II are false
3. I is false but II is true
4. I is true but II is false
In the extraction of copper from its sulphide ore, the metal finally obtained by the reduction of cuprous oxide with
1. Iron (II) sulphide
2. Carbon monoxide
3. Copper (I) sulphide
4. Sulphur dioxide
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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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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 is correct match?
1. Aluminium : Calamine
2. Copper : Malachite
3. Magnesium : Bauxite
4. Zinc : Carnallite
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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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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 method is based on distribution law?
1. Mond's process
2. Parke's process
3. Cupellation
4. Polling process
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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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
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