s-block-quiz-10

S-Block Quiz-10

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. H₂ O is dipolar whereas BeF₂ is not. It is because:

•  The electronegativity of F is greater than O
•  H₂ O involves H-bonding whereas BeF₂ is discrete molecule
•  H₂ O is linear and BeF₂ is angular
•  H₂ O is angular and BeF₂ is linear

Solution
(d) BeF₂ is linear (sp-hybridization), H₂ O is angular (sp³-hybridization).  

Q2.Which one of the following will dissolve in water most readily?

•  I₂
•  BaCO₃
•  KF
•  PbI₂

Solution

(c) All the alkali halides except lithium fluoride are freely soluble in water. I₂ (non-polar) is least soluble in water. Group IIA carbonates (BaCO₃ ) are insoluble in water. PbI₂ is sparingly soluble in cold water but quite soluble in hot water. KF (most polar) is most readily soluble in water.

Q3. Dead burnt is: 

•  CaSO₄
•  Na₂ CO₃
•  Anhydrous Na₂ SO₄
•  Anhydrous CuSO₄

Solution
(a) Dead burnt is CaSO₄.

Q4. Blanc fixe used in paints is:

•  Finely divided BaSO₄
•  Paste of Ba(OH)₂
•  Suspension of Ca(OH)₂
•  MgCl₂∙5MgO∙5H₂ O

Solution
(a) Blanc fixe is finely divided BaSO₄.

Q5.The most soluble halide in water is:

•  CaF₂
•  CaCl₂
•  CaBr₂
•  CaI₂

Solution
  (d) The solubility order: CaF₂<CaCl₂<CaBr₂<CaI₂.  

Q6. The plaster of Paris is:

•  CaSO₄∙2H₂ O
•  CaSO₄
•  2CaSO₄∙2H₂ O
•  2CaSO₄∙H₂ O

Solution
(d) It is a fact.  

Q7.Limestone is not used in which of the following manufacturing processes?

•  Phosphorus from phosphorite
•  Ordinary (soda lime) glass
•  Iron from haematite
•  Solvay process of sodium carbonate

Solution

(a) Lime stone is not used in the extraction of phosphorus from phosphorite [Ca₃ (PO₄ )₂]

Q8.Which gives apple green colour in fireworks?

•  Na
•  K
•  Ba
•  Ca

Solution
(c) Ba imparts green colour to flame.  

Q9.Which will react with acid and alkalies both i.e., (amphoteric)

•  MgO
•  CaO
•  BaO
•  BeO

Solution

(d) BeO+2HCl⟶BeCl₂+H₂ O; 

BeO+2NaOH⟶Na₂ BeO₂+H₂ O.

Q10. In the manufacture of sodium hydroxide, byproduct obtained is:

•  O₂
•  Cl₂
•  Na₂ CO₃
•  NaCl

Solution

(b) Due to anodic reaction as: 2Cl^-⟶Cl₂+2e.