THE S-BLOCK ELEMENTS Quiz-8

Chemistry Aptitude Quiz

Dear Readers,

IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies. Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Q1. Aqueous solution of Na2S2O3 on reaction with Cl2 gives

•   Na2S4O6
•  NaHSO4
•  NaCl
•  NaOH

Solution
(b)
Sodium thiosulphate, Na2S2O3 gets oxidised by chlorine water.
Na2S2O3 + 4Cl2 + 5H2O → 2NaHSO4 + 8HCl

Q2.Select the incorrect statement

•   Na2CO3 is thermally stable while Ag2CO3 decomposes into Ag.CO2 and O2
•  Ag^+ forms complexes, Na^+ does not
•  NaCl is water soluble, AgCl is insoluble
•  NaCl and AgCl both give colour in flame when lignited

Solution
(d) part
NaCl- golden yellow
AgCl- no flame

Q3.  To an acidified dichromate solution, a pinch ofNa2O2 and ether is added and shaken. What is observed

•   Deep violet colour
•  Red colour changing to green
•  Copious evolution of oxygen
•  Bluish-green precipitate

Solution
(a) part
Na2O2+2H(+)Cl(-) → H2O2 + 2NaCl
H2O2 + Cr2O7^(2-) + 2H(+) → CrO5
Deep violet soluble in ether

Q4. Na and Li are placed in dry air. We get

•   NaOH ,Na2O , Li2O
•  Na2O , Li2O
•  Na2O , Li2O , Li3N , NH3
•  Na2O , Li3N , Li2O

Solution
(d)
Na+O2 → Na2O
Li+O2 → Li2O
Li+Ni → Li3N

Q5.Which of the following is known as dead burnt?

•  Gypsum
•  Plaster of Paris
•  Anyhydrite
•  None of these

Solution
  c part

Q6. A covalent chloride is

•   BeCl2
•  NaCl
• MgCl2
•  CaCl2

Solution
(a) part

Q7. There is loss in weight when mixture of Li2CO3 and Na2CO3.10H2O

•  Li2CO3
•  Na2CO3.10H2)
•  Both a and b
•  None of these

Solution
(c) part
Li2CO3→Li2O+CO2↑
Na2CO3.10H2O→Na2 CO3+10H2O↑

Q8.

Following are the ionization potential values of
(I1)899 kJ mol^(-1),(I2)1757 kJ mol^(-1), (I3)15000 kJ mol^(-1)

•  Na
•  TK
•  Be
•  Ne

Solution
(c) part

Q9.II A (alkaline earth metals) and II B (zinc family) resemble

•  MgSO4∙7H2O is isomorphous with ZnSO4∙7H2O
•  II A and II B cations are not precipitated by H2S in acidic medium
•  Both a and b
•   None of the above

Solution
(c)Part

Q10. Which one among the following is the most soluble in water?

•  LiI
•  LiBr
•   LiCl
• LiF

Solution
(a) part