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S-Block Quiz-2

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..



Q1. Na2 CO3+Fe2 O3⟶A+CO2;A is:
  •  NaFeO2
  •  Na3 FeO3
  •  Fe3 O4
  •  Na2 FeO2
Solution
(a) Na2 CO3+Fe2 O3⟶2NaFeO2  

Q2.The compound insoluble in acetic acid is:
  •  Calcium oxide
  •  Calcium carbonate
  •  Calcium hydroxide
  •  Calcium oxalate
Solution
(d) CaC2 O4 is insoluble in acetic acid.

Q3. When hydrated MgCl2.6H2 O is strongly heated: 
  •  MgO is formed
  •  Mg(OH)2 is formed
  •  Mg(OH)Cl is formed
  •  Anhydrous MgCl2 is formed
Solution
(a)MgO is formed

Q4. Mortar is a mixture of
  •  Cement, sand and water
  •  MgCl2, tar and lime
  •  Lime, Portland cement and water
  •  None of the above
Solution
(a)Cement, sand and water

Q5.Which one of the following on hydrolysis, gives the corresponding metallic hydroxide, H2 O2 and O2?
  •  Li2 O
  •  Na2 O2
  •  NaO2
  •  Na2 O
Solution
 

Q6. When carbon monoxide is passed over solid caustic soda heated to 200℃, it forms
  •  Na2 CO3
  •  NaHCO3
  •  HCOONa
  •  CH3 COONa
Solution
 

Q7.NaOCl is used as a bleaching agent and sterilising agent. It can be synthesised by the action of
  •  NaCl with H2 O
  •  NH4 Cl with NaOH
  •  Cl2 with cold and dilute NaOH
  •  Cl2 with hot and concentrated NaOH
Solution

Q8.Among the following, which is water insoluble?
  •  Sodium fluoride
  •  Potassium fluoride
  •  Beryllium fluoride
  •  Magnesium fluoride
Solution
(d)Magnesium fluoride 

Q9.Carnallite is
  •  MgCO3 .CaCO3
  •  MgSO4 .7H2 O
  •  KAlSi3 O8
  •  KCl .MgCl2 .6H2 O
Solution
(d) Carnallite is an ore of potassium and magnesium i.e., KCl .MgCl2 .6H2 O.

Q10. The element that forms a solid basic oxide at room temperature is:
  •  Mg
  •  S
  •  H
  •  P
Solution
(a) Metal oxides are basic; non-metal oxides are acidic.


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