SOME BASIC CONCEPTS OF CHEMISTRY Quiz-17

 

SOME BASIC CONCEPTS OF CHEMISTRY Quiz-17

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.In the decomposition of 10 g of MgCO_3,0.1 mole CO_2 and 4.0 g MgO are obtained. Hence, percentage purity of MgCO_3 is  :

•  50%
•  60%
•  40%
•  84%

Solution

 

Q2.2C+O_2→2CO. In this reaction the mass of carbon will be used up in forming 11.2 L of CO at NTP is

•  0.6 g
•  6 g
•  12 g
•  24 g

Solution

Q3.The molarity of a solution obtained by mixing 750 mL of 0.5 (M) HCl with 250 mL of 2 (M)HClwill be  

•  0.875 M
•  1.00 M
•  1.75 M
•  0.0975 M

Solution

Q4.Equivalent weight of Mn〖O_4〗^⊖ in acidic, neutral and basic media are in ratio of:

•  3:5:15
•  5:3:1
•  5:1:13
•  3:15:5

Solution

Q5.TA colourless gas is dissolved in water and the resulting solution turns red litmus blue, the gas may have been which one of the following?

•  

  HCl

•  H_2 S
•  SO_2
•  NH_3

Solution
 

Q6.The volume of oxygen liberated at STP from 0.68 g of H_2 O_2 is 2H_2 O_2→2H_2 O+O_2

•  112 mL
•  224 mL
• 56 mL
•  336 mL)

Solution

Q7.An organic compound contains 4% sulphur. Its minimum molecular weight is

•  200
•  400
•  800
•  1600

Solution

Q8.Cu^(2+) and Ag^+ are both present in the same solution. To precipitate one of the ions and leave the other in solution, add

•  H_2 S(aq)
•  HCl(aq)
•  HNO_3
•  NH_4 NO_3 (aq)

Solution

Q9.Which set does not contain amphoteric species?

•  Al(OH)_3,Zn(OH)_2
•  SnO_2,Al_2 O_3
•  Fe(OH)_3,Ni(OH)_2
•  All of these

Solution

Q10.If an ore sample containing Mn is treated with 50 mL of 0.2750 M Na_2 C_2 O_4 aqnd the unreached Na_2 C_2 O_4 required 18.28 mL of 0.1232 M KMnO_4 in acidic medium, the number of moles of Mn in the ore is  

•  1.38×10^(-2)
•  1.49×10^(-3)
•  1.15×10^(-2)
• 8.12×10^(-3)

Solution

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