SOME BASIC CONCEPTS OF CHEMISTRY Quiz-22

 

SOME BASIC CONCEPTS OF CHEMISTRY Quiz-22

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 containing one mole borax reacts with two moles of acids. This is because of  :

•  Formation of 2 moles of B(OH)_3 only -
•  Formation of 2 moles of [B(OH)_4 ]^- only
•  Formation of mole each of [B(OH)_3 ] and [B(OH)_4 ]^-
•  Formation of 2 mol each of [B(OH)_4 ]^- and B(OH)_3, of which only [B(OH)_4 ]^- reacts with acid

Solution

Q2.Mixture of 1 g each of Na_2 CO_3 and NaHCO_3 is reacted with 0.1 N HCl.The mL of 0.1 N HCl required to react completely with the above mixture is

•  15.78 mL
•  157.8 mL
•  198.4 mL
•  307.7 mL

Solution

Q3.10 mL of NaHC_2 O_4solution is neutralized by 10 mL of 0.1 M NaOH solution.10 mL of same NaHC_2 O_4 solution is oxidized by 10 mL of KMnO_4solution in acidic medium. Hence, molarity of KMnO_4is  

•  0.1 M
•  0.2 M
•  0.04 M
•  0.02 M

Solution

Q4.In the following reaction, MnO_2+4HCl→MnCl_2+2H_2 O+Cl_2 2 moles MnO_2 react with 4 moles of HCl to form 11.2 L Cl_2 at STP. Thus, per cent yield of Cl_2 is

•  25%
•  50%
•  100%
•  75%

Solution

Q5.An aqueous solution of glucose is 10%. The volume in which 1 g mol of it is dissolved will be

•  0.9 L
•  9 L
•  1.8 L
•  18 L

Solution
 

Q6.100 mLof solution of CaCl_2is evaporated to dryness; residue obtained is 0.111g Molarity of CaCl_2 solution is

•  0.1 M
•  1.0 M
• 0.01 M
•  0.001 M

Solution

Q7.Colourless salt (A)+dil.H_2 SO_4+KI□(→┴Starch ) blue colour. (A) can be

•  K_2 Cr_2 O_7
•  MnO_2
•  NH_4 NO_2
•  NH_4 Cl

Solution

Q8.The mass of 70% H_2 SO_4 required for neutralization of one mole of NaOH is

•  30 g
•  70 g
•  35 g
•  95 g

Solution

Q9.A gaseous mixture contains O_2 and N_2 in the ratio of 1:4 by wight. The ratio of their number of molecules is

•  1:4
•  1:8
•  7:32
•  3:16

Solution

Q10.A mineral consists of an equimolar mixture of the carbonates of two bivalent metals. One metal is present to the extent of 15.0% by weight, 3.0 g of the mineral on heating lost 1.10 g of CO_2. The percent by weight of other metal is  

•  65
•  25
•  75
• 35

Solution

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