GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS Quiz-15
Dear Readers,
The one subject in NEET which is candidates who can easily attain good marks is Chemistry. That's the reason, often, one doesn’t pay notice and choose to compromise it. But if one wants to rank above others, the tip is to be thorough with NEET chemistry concepts. The understanding of reactions and definite basic understanding is what requires major attention in Chemistry but once done it only gets simpler from there. The main focus on the to-do list should be on getting a hang of the NCERT syllabus of NEET chemistry.
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Q1. In the formation of Al2 O3 large amount of heat is evolved. This property is used in:
Solution
It is a fact.
It is a fact.
Q2. Heating mixture of Cu2 O and Cu2 S will give
Solution
Following reaction takes place during bessemerisation 2Cu2 O+Cu2 S→6Cu+SO2
Following reaction takes place during bessemerisation 2Cu2 O+Cu2 S→6Cu+SO2
Q3. Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?
Solution
2MS+C→2M+CS2 ∆G1=positive 2MO+C→2M+CO2 ∆G2=negative The value of ∆G for the9 formation of CO2is negative, ie, it is thermodynamically more than CS2.Also metal sulphides are thermodynamically more stable than CS2.Metal sulphides are more stable than the corresponding oxides, so they are roasted to convert into less stable oxides
2MS+C→2M+CS2 ∆G1=positive 2MO+C→2M+CO2 ∆G2=negative The value of ∆G for the9 formation of CO2is negative, ie, it is thermodynamically more than CS2.Also metal sulphides are thermodynamically more stable than CS2.Metal sulphides are more stable than the corresponding oxides, so they are roasted to convert into less stable oxides
Q4. Extraction of silver from its ore ore involving NaCN, air and an active metal is known as:
Solution
Follow Mc Arthur-Forest process for Ag.
Follow Mc Arthur-Forest process for Ag.
Q5.Stainless steel has iron and
Solution
Stainless steel is an alloy of iron with chromium and nicl Its composition is 82% Fe and 18% (Cr+Ni). It res corrosion and used for making automobile parts and utensils
Stainless steel is an alloy of iron with chromium and nicl Its composition is 82% Fe and 18% (Cr+Ni). It res corrosion and used for making automobile parts and utensils
Q6. Which of the following is a metal?
Solution
Metallic character increases down the gp.
Metallic character increases down the gp.
Q7.Carnallite is a mineral of
Solution
It is a fact.
It is a fact.
Q8.Which is not an iron ore?
Solution
Cassiterite is SnO2.
Cassiterite is SnO2.
Q9.The second most common element on the earth is:
Solution
It is a fact.
It is a fact.
Q10. When MnO2 is fused with KOH, a coloured compound is formed, the compound and its colour is:
Solution
2MnO2+4KOH+O2⟶2K2 MnO4+2H2 O Purple green
2MnO2+4KOH+O2⟶2K2 MnO4+2H2 O Purple green
