## CBSE Class 11 Some Basic Concepts of Chemistry MCQs

**CBSE Class 11 Some Basic Concepts of Chemistry MCQs**. These **MCQs of Some Basic Concepts of Chemistry** chapter are prepared by our Chemistry Expert. By practising following MCQs, students will be able to quickly revise all the concepts of the Some Basic Concepts of Chemistry Chapter. Additionally, **CBSE Class 11 Some Basic Concepts of Chemistry MCQs** will be helpfull for JEE And NEET Aspirants.

Refer to our **Chemistry 11 MCQs** for scoring Excellent Marks in your Exams.

### CBSE Class 11 Some Basic Concepts of Chemistry MCQs (Set A)

1**. The mass of 70% pure H2SO4 required for neutralization of 1 mol of NaOH is(A) 49 gm(B) 98 gm(C) 70 gm(D) 34.3 gm**

Answer=70gm

2. **Which of the following contains maximum number of molecules?(A) 400 cc of O2 at S.T.P.(B) 500 cc of NH3 at S.T.P(C) 250 cc of SO2 at S.T.P.(D) 150 cc of CO2 at S.T.P.**

Answer=150 cc of CO2 at S.T.P

3. **Hydrogen and oxygen combine to form H2O2and H2O containing 5.93% and 11.2% Hydrogen respectively. The data illustrates-(A) Law of conservation of mass(B) Law of constant proportions(C) Law of reciprocal proportions(D) Law of multiple proportions**

Answer=Law of multiple proportions

4.**One of the following combinations illustrates the law of reciprocal proportions -(A) N2O3, N2O4, N2O5(B) NaCl, NaBr, NaI(C) CS2, CO2, SO2(D) PH3, P2O3, PCl**

Answer=PH3,P2O3,PCL

5.**A compound contains 69.5% oxygen and 30.5% nitrogen its molecular weight is 92. The molecular formula of the compound will be-(A) N2O(B) NO2(C) N2O4(D) N2O5**

Answer=N2O4

### CBSE Class 11 Some Basic Concepts of Chemistry MCQs (Set B)

6. **Number of Ca+2 and Cl– ion in 111 g of anhydrousCaCl2 are -(A) NA, 2NA(B)none(C)NA, NA(D)3NA , NA**

Answer=NA,2NA

7. 1.2 gm of Mg (At. Mass 24) will produce MgO equal to -(A) 0.05 mol(B) 40 gm(C) 40 mg(D) 4 gm

Answer=0.05 mol

8.Insulin contains 3.4% sulphur by mass. What will be the minimum molecular weight of insulin?(A) 941.17 gm(B) 1884 gm(C) 941 gm(D) 977 gm

Answer =941.17 gm

9. The percent of N in 66% pure (NH4)2SO4 sample is-(A) 32(B) 28(C) 14(D) None of these

Answer=14

10.An element (A) (at. wt. = 75) and another element (B) (at. wt. = 25) combine to form a compound. The compound contains 75% (A) by weight. The formula of the compound will be-(A) A2B(B) A3B(C) AB3(D) AB

Answer=AB

### CBSE Class 11 Some Basic Concepts of Chemistry MCQs (Set C)

11 .The maximum volume at N.T.P. is occupied by-(A) 12.8 gm of SO2(B) 6.02 × 1022 molecules of CH4(C) 0.5 mol of NO2(D) l gm-molecule of CO2

Answer=1 gm molecule of CO2

12.A compound contains 69.5% oxygen and 30.5% nitrogen its molecular weight is 92. The molecular formula of the compound will be-(A) N2O(B) NO2(C) N2O4(D) N2O5

Answer=N2O4

13.The number of g-atoms of calcium left is (Ca = 40) If ,1.2 × 1019 atoms are removed from 2 mg calcium. (A) 5 × 10^–5 (B) 2 × 10^–5 (C) 3 × 10^–5(D) 5 × 10^–6A

nswer=3×10^-5

14. Hydrazine N2H4 (used as a fuel in rocket system) can be produced according to the following reaction. ClNH2 + 2NH3 —–N2H4 + NH4Cl When 1.0 kg C1NH2 is reacted with excess of NH3, 473 g of N2H4 is produced. What is the percentage yield? (A) 76.12(B) 67.21 (C) 26.17 (D) 16.72

Answer=76.12

15. Two successive reactions, A —-B and B —– C, have yields of 90% and 80%, respectively. What is the overall percentage yield for conversion of A to C? (A) 90% (B) 80% (C) 72% (D) 85%

Answer=72%

### CBSE Class 11 Some Basic Concepts of Chemistry MCQs (Set D)

16. A volume of 10 ml of gaseous C4HX exactly requires 55 ml O2 for complete combustion. The value of ‘x’ is (A) 4(B) 6 (C) 8 (D) 10

Answer=6

17. 0.3 g of an acid is neutralized by 40 cm3 of 0.125 N NaOH. Equivalent mass of the acid is (A) 60 (B) 45 (C) 30 (D) 63

Answer=60

18. The number of molecules in 0.02N H2SO4 in 100ml is (A) 6.02 × 10^22 (B) 6.02 × 10^21(C) 6.02 × 10^20(D) 6.02 × 10^18

Answer=6.02×10^20

19. The number of atoms in 4.25 g of NH3 is approximately:(A) 1 × 10^23(B) 1.5 × 10^23(C) 2 × 10^23(D) 6 × 10^23

Answer=6×10^23

20.The value of x must be If A gas is found to have the formula (CO)x. It’s VD is 70. (A) 7 (B) 4(C) 5 (D) 6

Answer=5

### CBSE Class 11 Some Basic Concepts of Chemistry MCQs (Set E)

21. A hydrocarbon contains 80% of carbon, then the hydrocarbon is-(A) CH3(B) C2H4(C) C2H6(D) C2H2

.Answer=CH3

22.Caffeine has a molecular weight of 194. It contains 28.9% by mass of nitrogen. Number of atoms ofnitrogen in one molecule of it is:(A) 2 (B) 3(C) 4 (D) 5

Answer=C

23. The number of litres of air required to burn 8 litres of C2H2 is approximately:(A) 40 (B) 60 (C) 80 (D) 100

Answer=100

24. If 0.5 mol of BaCl2 is mixed with 0.2 mol of Na3PO4, the maximum number of moles of Ba3(PO4)2that can be formed is:3BaCl2 + 2Na3PO4 → Ba3(PO4)2 + 6NaCl(A) 0.7 (B) 0.5(C) 0.2(D) 0.1

Answer=0.2

25. For the reaction A + 2B → C, 5 mol of A and 8 mol of B will produce(A) 5 mole of C(B) 4 mole of C(C) 8 mole of C(D) 13 mole of C

Answer=4 mole of C

### CBSE Class 11 Some Basic Concepts of Chemistry MCQs (Set F)

26. Molecular weight of tribasic acid is W. Its equivalent weight will be:(A) W/2(B) W/3(C) W (D) 3W

Answer=W/3

27. 0.126 g of an acid requires 20 mL of 0.1 N NaOH for complete neutralisation. Equivalent weight of the acid is:(A) 45 (B) 53 (C) 40 (D) 63

Answer=63

28. What is its gram molecular weight ,If 5 L of gas at STP weighs 6.25 g(A) 1.25 (B) 14 (C) 28 (D) 56

Answer=28

29. At STP 0.44 g of a colourless oxide of nitrogen occupies 224 mL . The compound is(A) N2O (B) NO (C) N2O4(D) NO2

Answer=N2O

30. The number of electrons in 1.6 g of CH4 is approximately(A) 25 × 10^24(B) 1.5 × 10^24(C) 6 × 10^23(D) 3.0 × 10^24

Answer=6×10^23

### CBSE Class 11 Some Basic Concepts of Chemistry MCQs (Set G)

31. The amount of zinc required to produce 1.12 ml of H2 at STP on treatment with dilute HCl will be (A) 65 g (B) 0.065 g(C) 32.5 × 10^–4 g (D) 6.5 g

Answer=32.5×10^-4g

32. Volume of CO2 obtained at STP by the complete decomposition of 9.85 g Na2CO3 is(A) 2.24 litre (B) Zero(C) 0.85 litre (D) 0.56 litre

Answer=zero

33. An organic compound containing C and H gave the following analysis C = 40%, H = 6.7%. Its empirical formula would be(A) CH4(B) CH2O(C) C2H4O2(D) C2H4

Answer=CH2O

34. What is equivalent weight of crystalline oxalic acid is(A) 90 (B) 63(C) 53 (D) 45

Answer=63

35. Which one of the following pairs of compound illustrate the law of multiple proportions?(A) H2O, Na2O (B) MgO, Na2O(C) Na2O, BaO (D) SnCl2, SnCl4

Answer=SnCl2 , SnCl4

### CBSE Class 11 Some Basic Concepts of Chemistry MCQs (Set H)

36. If law of conservation of mass was to hold true, then 20.8 g of BaCl2 on reaction with 9.8 g of H2SO4 will produce 7.3 g of HCl. Determine the weight of BaSO4 produced.(A) 11.65 g (B) 23.3 g(C) 25.5 g (D) 30.6 g

Answer=23.3 g

37. How many grams of NaOH should be added to water to prepare 250 ml solution of 2 M NaOH?(A) 9.6 × 103(B) 2.4 × 103(C) 20(D) 24

38.The volume of concentrated sulphuric acid (98 mass % H2SO4, density 1.84 g cm–3) required to prepare 5 dm3 of 0.5 mol dm–3solution of sulphuric acid is (A) 68 cm3(B) 136 cm3(C) 204 cm3(D) 272 cm3

Answer=136 cm3

39. Mole fraction of the solute in a 1.00 molal aqueous solution is (A) 1.7700 (B) 0.1770(C) 0.0177 (D) 0.0344

Answer=0.0177

40. How many grams of CH3OH should be added to water to prepare 150 ml solution of 2 M CH3OH?(A) 9.6 × 10^3(B) 2.4 × 10^3(C) 9.6 (D) 2.4

Answer=9.6

### CBSE Class 11 Some Basic Concepts of Chemistry MCQs (Set I)

41. Change in volume when 100 mL PH3 decomposed to solid phosphorus and H2 gas.(A) Increase in 50 mL (B) Decrease in 50 mL(C) Increase in 150 mL (D) Decrease in 200 mL

Answer=Increase in 50 mL

42. In the reaction, 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(l), when 1 mole of ammonia and 1 mole of O2are made to react to completion(A) All the oxygen will be consumed(B) none(C) 1.0 mole of H2O is produced(D) All the ammonia will be consumed

Answer=All oxygen will be consumed

43. The volume of 0.1 N dibasic acid is sufficient to neutralize 1 g of a base that furnishes 0.04 mol of OH–in aqueous medium is: (A) 400 mL(B) 600 mL(C) 200 mL(D) 800 mL

Related Links:

**Class 11 Some Basic Concepts of Chemistry Notes**

**Class 12 Chemistry MCQs**

**Class 12 Physics MCQs**