Match the items in Column I with the items in Column II and assign the correct code.

Column I

Column II

A. Pendulum

1. Chrome steel

B. Malachite

2. Nickel Steel

C. Calamine

3. Na3AlF6

D. Cryolite

4. CuCO3. Cu (OH)2

5. ZnCO3


Codes

A B C D
1. 1 2 3 4
2. 2 4 5 3
3. 2 3 4 5
4. 4 5 3 2
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Which of the following is an iron mineral?

1. Malachite

2. Cassiterite

3. Pyrolusite

4. Magnetite

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Roasting of sulphides gives the gas 'X' as a by-product. This is a colourless gas with the choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as an oxidising agent, and its acid has never been isolated. The gas 'X' is:

1. SO2

2. CO2

3. SO3

4. H2S

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From the following, the ores that are concentrated by froth flotation are:

a. Haematite b. Galena
c. Copper pyrites    d. Magnetite

Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d

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What is the fundamental principle of froth flotation?  

1. Impurities and metal ore have different wetting properties
2. Impurities and metal ore have different solubility
3. Impurities and metal ore have different diversity
4. Impurities and metal ore have different compressive powers

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Which are the most abundant elements present inside the earth's crust?

1. Al, and Fe 

2. Al, and Cu

3. Fe, and Cu

4. Cu, and Ag

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The chemical composition of "slag" formed during the smelting process in the extraction of copper is:

1. Cu+ FeS                                    

2. FeSiO3

3. CuFeS                                         

4. Cu2S + FeO

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Consider the following reaction.
  \(\small{Bauxite\ ore\ +\ NaOH\ (conc.) \xrightarrow[\Delta]{Digester} \underset{Soluble}{(A)}\ \\ (A) \xrightarrow{Fresh\ Al(OH)_3}\ \underset{White}{(B)}\ +\ (C) \\ {(B)} \xrightarrow[]{\Delta}\ (D)\ +\ H_2O}\)
What is the molecular formula of compound D?

1. NaAlO2

2. AlOH3

3. Al2O3

4. Na2O

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Reactions among the following that occur during calcination are:

a. CaCO→ CaO + CO2
b. 2FeS2 + \(\frac{11}{2}\)O2 → Fe2O3 + SO2
c. Al2O3.xH2O → Al2O+ xH2O
d. ZnS + \(\frac{3}{2}\)O2 → ZnO + SO2

Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and c

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What is the name of a substance that acts as a collector in the froth flotation method?

1. Sodium xenate           

2. Sodium pyrophosphate

3. Sodium nitroprusside   

4. Sodium ethyl xanthate 

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