THE S-BLOCK ELEMENTS Quiz-5

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. The deliquescent among the following is

•  CaCl2
•  FeSO4.7H20
•  CuSO4.5H20
•  BaCl2.2H20

Solution
(a) PART

Q2.Out of the following statements
I. Cs^+ is highly hydrated
II. Li has highest melting point among Li, Na, K and Rb
III. Only Li forms nitride out of alkali metals
The correct statements are

•   1 and 2
•  2 and 3
•  1 and 3
•  1 , 2 and 3

Solution
(b) Smaller the size of cation, larger the hydration; size of Li+ < Na+ < K+ < Rb+ < Cs+ Thus, Cs+ is least hydrated Thus, I is incorrect Li has closed packed structure. Thus, II is correct Only Li forms nitride. Thus, III is correct Thus, II and III are correct

Q3.  Select the correct statement

•   Be and Al show diagonal relationship
•  Be form tetrahedral complexes [Be(C2O4)2](2-)
•  Al forms AlF6(2-), on octahedral complex
•  All of these

Solution
(d) part

Q4. Which is most stable out of the following?

•  [Be(H2O)4 ](2+)
•  [Mg(H2O)4 ](2-)
•  [Ca(H2O)4](2+)
•  [Sr(H2O)4](2+)

Solution
(a) Smaller the size of cation, larger the hydration, hence, larger the stability of hydrated ion

Q5. Which of the following is/are correct statement(s)?

•  Ca3(PO4)2 in part of bones
•  3Ca3(PO4)∙CaF2 is part of enamel of teeth
•  Ca(2+) ions are important in blood clotting
•  All the above

Solution
  a part

Q6. What is impurity (as a salt) associated with table salt obtained from sea-water?

•   NaHCO3
•  MgCO3
• MgCl2
•  NaI

Solution
(c) part

Q7. Which disproportionate into M_2 O_2 (peroxide) and M(metal) on heating?

•  Li2O
•  Na2O
•  Both a and b
•  None of the above

Solution
(b) 2Na_2 O→Na_2 O_2+2Na

Q8.Epsom Salt is :

•  BaSO4∙2H2O
•  TCaSO4∙2H2O
•  MgSO4∙2H2O
•  MgSO4∙7H2O

Solution
(d) part

Q9.Which are involved in various physiological functions in animals?

•  Na+
•  TK+
•  Both a and b
•  None of these

Solution
(c)Part

Q10. Setting of cement is

•  Exothermic reaction
•  Endothermic reaction
•   Neither endothermic nor exothermic
• None of the above

Solution
(a) It involved hydration hence exothermic