SOME BASIC CONCEPTS OF CHEMISTRY Quiz-37

Some basic concepts of chemistry Quiz-37

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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.A 20.0 mL solution of Na_2 CO_3required 30 mL of 0.01 M K_2 Cr_2 O_7 solution for the oxidation to Na_2 SO_4.Hence, molarity of Na_2 SO_3solution is

•  0.015 M
•  0.045 M
•  0.030 M
•  .0225 M

Solution

Q2.Four test tubes containing dil. HCl,BaCl_2,CdCl_2 and KNO_3 solution. Which of the following will identify BaCl_2?

•  Dil. H_2 SO_4
•  K_2 CrO_4
•  FeSO_4/H_2 SO_4
•  AgNO_3

Solution

Q3. 5.3 g of M_2 CO_3 is dissolved in 150 mL of 1 N HCl.Unused acid required 100 mL of 0.5 N NaOH.Hence, equivalent weight of M is

•  23
•  12
•  24
•  13

Solution

Q4. 0.45 g of an acid of molecular weight 90 was neutralized by 20 mL of a 0.5 N caustic potash. The basicity of an acid is

•  1
•  2
•  3
•  4

Solution

Q5. 10 mLof a blood sample (containing calcium oxalate) is dissolved in acid. It required 20 mLof 0.001 M KMnO_4(which oxidizes oxalate to carbon dioxide) hence, Ca^(2+) ion in 10 mLblood is

•  0.200 g
•  0.02 g
•  2.00 g
•  0.002 g

Solution
 

Q6. Nine volumes of gaseous mixture consisting of gaseous organic compound A and just sufficient amount of oxygen required for complete combustion yielded on burning 4 volumes of CO_2, 6 volumes of water vapours, and 2 volumes of N_2, at all volumes measured at the same temperature and pressure. If the compounds contains C, H, and N only, the molecular formula of compound A is

•  C_2 H_3 N_2
•  C_2 H_6 N_2
• C_3 H_6 N_2
•  C_3 H_6 N

Solution

Q7. 0.6 g NH_2 CONH_2 is treated with NaOH and NH_3 formed is passed into 300 mL of 0.1 N H_2 SO_4.Unused acid is

•  50 mL
•  25 mL
•  100 mL
•  150 mL

Solution

Q8. The mass of K_2 Cr_2 O_7 required to produce 5.0 L CO_2 at 77℃ and 0.82 atm pressure from excess of oxalic acid and volume of 0.1 N NaOH required to neutralize the CO_2 evolved, respectively, are

•  7 g, 2.86 L
•  5 g, 1.86 L
•  4 g, 0.86 L
•  None

Solution

Q9. In a gas S and O are 50% by mass, hence, their mole ratio is

•  1∶ 1
•  1∶ 2
•  2∶ 1
•  3∶ 1

Solution

Q10. A 4:1 molar mixture of He and CH_4 is contained in vessel at 20 bar pressure. Due to a hole in the vessel the gas mixture leakes out. What is the composition of mixture effusing out initially

•  33.3% He,66.7% CH_4
•  66.7% He,33.3% CH_4
•  40% He,60% CH_4
• 60% He,40% CH_4

Solution