NEET UG, JEE Main Chemistry questions: Online Multiple Choice Questions (MCQs) with answers for NEET and JEE Main aspirants, Chemistry Practice questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, NCERT Exemplar Questions ...
1. Cyclohexanol is dehydrated to cyclohexene on heating with conc H2SO4. The cyclohexene obtained from 100 g cyclohexanol will be-
(If yield of reaction is 75%)
a) 61.5 g
b)75.0 g
c) 20.0 g
d)41.0 g
2. A compound was found to contain nitrogen and oxygen in the ratio, nitrogen 28 g and 80 g of oxygen. The formula of the compound is:
a)NO
b)N2O3
c) N2O5
d)N2O4
3. Versene, a chelating agent having chemical formula C2H4N2(C2H2O2Na)4. If each mole of this compound could bind 1 mole of Ca2 +, then the rating of pure versene expressed as mg of CaCO3 bound per g of chelating agent is:
a) 100 mg
b)163 mg
c) 200 mg
d)263 mg
4. Which of the following is correct?
a) Meq. = N × Vin mL = wt. × 1000 / Eq. wt.
b)Eq. = N × Vin mL = wt. / Eq. wt.
c) Equal equivalent or milli equivalent of reactants react to give same eq. or Meq. of products
d)All of the above
5. 1.0 g of pure calcium carbonate was found to require 50 mL of dilute HCl for complete reactions. The strength of the HCl solution is given by:
a) 4 N
b)2 N
c) 0.4 N
d)0.2 N
6. The number of atoms in 4.25 g of NH3 is approximately
a) 6 × 1023
b)2 × 1023
c) 1.5 × 1023
d)1 × 1023
7. MnO―4 ions are reduced in acidic condition to Mn2+ ions whereas they are reduced in neutral condition to MnO2. The oxidation of 25 mL of a solution X containing Fe2+ ions required in acidic condition 20 mL of a solution Y containing MnO―4 ions. What volume of solution Y would be required to oxidise 25 mL of a solution X containing Fe2+ ions in neutral condition?
a) 11.4 mL
b)12.0mL
c) 33.3 mL
d)35.0 mL
8. Number of atoms of He in 100 u of He (atomic weight of He is 4) are
a) 25
b)100
c) 50
d)100 × 6 × 10―23
9. Total number of atoms present in 1.0 cm3 of solid glucose (density 0.8 g/ cm3) at 25 ͦC are:
a) 2.68 × 1021
b)6.42 × 1022
c) 2.68 × 1022
d)2.68 × 1023
10. For preparing M/ 10 solution of H2SO4 in one litre we need H2SO4:
a) 9.8 g
b)49.0 g
c) 4.8 g
d)0.09 g
11. Given, that the abundances of isotopes 54Fe, 56Fe and 57Fe are 5%,90% and 5%, respectively, the atomic mass of Fe is
a) 55.85
b)55.95
c) 55.75
d)56.05
12. The concentration of solution containing 0.5 mole H3PO4 dissolved in 500 g water:
a) 1 m
b)1 M
c) 1 N
d)0.5 M
13. 100 g of CaCO3 is treated with 1 L of 1 N HCI. What would be the weight of CO2 liberated after the completion of the reaction?
a) 55 g
b)11 g
c) 22 g
d)33 g
14. If an iodized salt contains 1% KI and a person takes 2 g of the salt every day, the iodide ions going into his body every day would be approximately
a) 7.2 × 1021
b)7.2 × 1019
c) 3.6 × 1021
d)9.5 × 1019
15. The mass of 11.2 L of ammonia gas at STP is
a) 8.5 g
b)85 g
c) 17 g
d)1.7 g
16. 0.52 g of dibasic acid required 100 mL of 0.1 N NaOH for complete neutralization. The equivalent weight of acid is:
a) 26
b)52
c) 104
d)156
17. 100 tons of Fe2O3 containing 20% impurities will give iron by reduction with H2 equal to
a) 112 tons
b)80 tons
c) 160 tons
d)56 tons
18. 25 mL of a solution of barium hydroxide on titration with 0.1 M solution of HCl gave a titre value of 35 mL. The molarity of Ba(OH)2 is:
a) 0.28
b)0.35
c) 0.07
d)0.14
19. Volume occupied by one molecule of water (density = 1 g cm―3) is:
a) 6.023 × 10―23cm3
b) 3.0 × 10―23cm3
c) 5.5 × 10―23cm3
d)9.0 × 10―23cm3
Answer Key
1- A , 2- C, 3- D, 4-D , 5-C, 6-A, 7-C, 8-A, 9-B, 10-A,
11-B, 12-A, 13-C, 14-B, 15-A, 16-B, 17-D, 18-C, 19-B
Read 👉👉👉 SOME BASIC CONCEPTS OF CHEMISTRY PART-2
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