SOME BASIC CONCEPTS OF CHEMISTRY Quiz-33

Some basic concepts of chemistry Quiz-33

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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.Assuming fully decomposed, the volume of CO_2 released at STP on heating 9.85 g of BaCO_3 (Atomic mass, Ba = 137) will be

•  1.12 L
•  0.84 L
•  2.24 L
•  4.06 L

Solution

Q2.A gaseous mixture contains oxygen and nitrogen in the ratio of 1:4 by weight. Therefore, the ratio of their number of molecules is

•  1:4
•  1:8
•  7:32
•  3:16

Solution

Q3. An aqueous solution of 6.3 g oxalic acid dihydrate is made upto 250 mL.The volume of 0.1 N NaOH required to completely neutralize 10 mL of this solution is

•  40 mL
•  20 mL
•  10 mL
•  50 mL

Solution

Q4. 100 mL of mixture of NaOH and Na_2 SO_4 is neutralized by 10 mL of 0.5 M H_2 SO_4. Hence, NaOH in 100 mL solution is

•  0.2 g
•  0.4 g
•  0.6 g
•  None

Solution

Q5. Mole fraction of glucose in aqueous solution is 0.5. Hence, molality of glucose solution is

•  55.55
•  1.0
•  0.055
•  90.0

Solution
 

Q6. 0.848 g aqueous solution of a mixture containing Na_2 CO_3, NaOH, and an inert matter is titrated with M/2 HCl. The colour of phenolphthalein disappears when 20 mL of the acid has been added. Methyl orange is then added and 0.8 mL more of the acid is required to give a red colour to the solution. The percentage of Na_2 CO_3 is

•  25
•  12.5
• c) 75
•  50

Solution

Q7. 10 L of hard water required 0.56 g of lime (CaO) for removing hardness. Hence, temporary hardness in ppm (part per million 10^6) of CaCO_3 is:

•  100
•  200
•  10
•  20

Solution

Q8. 

•  
•  (B),(A)
•  Both (A)
•  Both (B)

Solution

Q9. 2.86 g of Na_2 CO_3.xH_2 O in 100 mLsolution is 0.2 N. Hence, x is

•  5
•  10
•  20
•  2

Solution

Q10. [X]+H_2 SO_4→[Y] a colourless gas with irritating smell [Y]+K_2 Cr_2 O_7+H_2 SO_4→ green solution [X] and [Y] aree

•  O_3^(2-),SO_2
•  Cl^-,HCl
•  S^(2-),H_2 S
• CO_3^(2-),CO_2

Solution