s-block-quiz-5

S-Block Quiz-5

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. The process associated with sodium carbonate manufacture is known as ….process.

•  Chamber
•  Haber
•  Leblanc
•  Castner

Solution
(c) Le blanc method is for the manufacture of Na₂ CO₃.  

Q2.Caustic soda solution is an absorbent for:

•  NH₃
•  CO₂
•  CO
•  N₂ O

Solution

(b) Caustic soda (an alkali) can absorb acidic oxides.

Q3. Aqueous solution of Na₂ S₂ O₃ on reaction with Cl₂ gives  

•  Na₂ S₄ O₆
•  NaHSO₄
•  NaCl
•  NaOH

Solution
(b) Sodium thiosulphate, Na₂ S₂ O₃ gets oxidised by chlorine water. 

 Na₂ S₂ O₃+4Cl₂+5H₂ O →2NaHSO₄+8HCl

Q4. Which property of Na₂ S₂ O₃ makes it useful in photography?

•  Photochemical property
•  Complex formation property
•  Oxidising agent
•  Reducing agent

Solution
(b) Sodium thiosulphate (Na₂ S₂ O₃ ) is useful in photography due to its complex formation property. It is used in photography as a fixer since, it dissolves unexposed silver bromide.

Q5.The main constituent of egg-shells is:

•  CaCO₃
•  CaSiO₃
•  CaSO₄∙1/2 H₂ O
•  CaSO₄∙2H₂ O

Solution
  (a) Egg-shells are made up of CaCO₃.  

Q6. The ionic carbide is:

•  CaC₂
•  ZnC
•  SiC
•  TiC

Solution
(a) Ca²⁺ and C₂^2- ions.  

Q7.A metal M readily forms its sulphate MSO₄ which is water soluble. It forms its oxide MO which becomes inert on heating. It forms its insoluble hydroxide M(OH)₂ which is soluble in NaOH solution. Then, M is

•  Be
•  Ba
•  Ca
•  Mg

Solution

(a)Be

Q8.Pick out the statement (s) which is (are) not true about the diagonal relationship of Li and Mg. 

 (i) Polarising powers of Li⁺ and Mg²⁺ are almost same.

 (ii) L like Li, Mg decomposes water very fast. 

(iii) LiCl and MgCl₂ are deliquescent. 

 (iv) Like Li, Mg does not form solid bicarbonates.

•  (i) and (ii)
•  (ii) and (iii)
•  Only (ii)
•  Only (i)

Solution
(c) Lithium and magnesium shows diagonal relationship. Some points of similarity are 

(i) Polarising power of Li⁺ and Mg⁺ are almost same. 

(ii) Like Li, Mg decomposes water very slowly. 

(iii) LiCl and MgCl₂ are deliquescent. 

(iv) Like Li, Mg do not form solid bicarbonates.  

Q9.The hydration energy of Mg²⁺ ions is larger than that of:

•  Al³⁺
•  Na⁺
•  Be²⁺
•  Mg³⁺

Solution

(b) Mg²⁺ is smaller than Na⁺ and larger than all others. Smaller is ion, more is hydration energy.

Q10. An inorganic compound first melts then resolidifies and then liberates a gas. It may be:

•  KClO₃
•  KMnO₄
•  Al₂ O₃
•  MnO₂

Solution

(a)KClO₃