Some Basic Concepts of Chemistry MCQ for NEET with Answers

Some Basic Concepts of Chemistry MCQ: Some Basic Concepts of Chemistry is an important part of the Class 11 curriculum. For those preparing for the NEET exam, grasping these fundamental concepts is essential. Some Basic Concepts of Chemistry MCQ NEET provided are designed according to the NEET exam format, helping students become familiar with the types of questions they might face in NEET exam.

Some Basic Concepts of Chemistry MCQ NEET

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Some Basic Concepts of Chemistry MCQ with Solutions

Some Basic Concepts of Chemistry MCQ Class 11

1. Which of the following statements is/are true for pure substances?

1. An element of a substance contains only one kind of atom.
2. A compound can be decomposed into its components.
3. All homogeneous mixtures are solutions.
4. All of these

2. Which of the following is a solution?

1. Heterogeneous mixture
2. Homogeneous mixture
3. Partially Homogeneous & Heterogenous
4. Both (1) and (2)

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3. When two or more atoms of different elements combine with each other in a fixed ratio, the molecule of _____ is obtained.

1. A compound
2. An elements
3. An atom
4. An ion

4. Air is a/an:

1. Heterogeneous mixture.
2. Element.
3. Compound.
4. Homogeneous mixture.

5. Which of the following mixtures is/are homogeneous?

1. Tincture of iodine
2. Smoke
3. Brass
4. Sugar solution

6. The number of significant figures in 0.06900 is:

1. 5
2. 4
3. 2
4. 3

7. Taking into account the significant figures, what is the value of 9.99 m –0.0099 m?

1. 9.9801 m
2. 9.98 m
3. 9.980 m
4. 9.9 m

8. Determine the number of significant figures in the following:

1. 1005000 cm
2. 1.005 g
3. 0.000125 m
4. 10000 km
5. 0.02002 s
6. 2002 mL
7. 200.200 days

1. 1005000 cm = 4
2. 1.005 g = 4
3. 0.000125 m = 3
4. 10000 km = 4
5. 0.02002 s = 4
6. 2002 mL = 4
7. 200.200 days = 6

9. How many significant figures are in the number 0.00150?

1. 5
2. 3
3. 6
4. 2

10. Calculate and give the answer with the correct number of significant figures. (0.05 + 0.123) × (1.02 + 0.9)

1. 0.3321
2. 0.332
3. 0.3
4. 0.33

11. The sum of the numbers 436.32,227.2 and 0.301 in appropriate significant figures is:

1. 663.821
2. 664
3. 663.8
4. 663.82

12. 2.34 is obtained by rounding off the number.

1. 2.346
2. 2.355
3. 2.335
4. 2.334

13. When energy is expressed in erg the number of significant figures is four. If it is expressed in joule the no. of significant figures will become?

1. 9
2. 5
3. 1
4. 4

14. What weight of BaCl2 would react with 24.4 g of sodium sulphate to produce 46.6 g of barium sulfate & 23.4 g of sodium chloride?

1. 29.8
2. 56.1
3. 45.6
4. 46.4

15. An unbalanced chemical equation is against the law of:

1. The law of gaseous volumes
2. The law of constant proportions
3. The law of mass action
4. The law of conservation of mass

16. All samples of carbon dioxide contain carbon & oxygen in the mass ratio of 3:8. This is in agreement with the law of:

1. Conservation of mass
2. Constant composition
3. Multiple proportions
4. Constant volume

17. In one sample of a compound of A and B, 2.50 gA combines with 8.00 g B. In another sample of a compound of A and B, 1.20 g of A combines with 3.84 g of B. These results illustrate:

1. Law of conservation of mass
2. Law of definite proportions
3. Law of multiple proportions
4. Law of gaseous volumes

18. A sample of pure carbon dioxide, irrespective of its source contains 27.27% carbon and 72.34% oxygen. The data support:

1. Law of constant composition
2. Law of conservation of mass
3. Law of reciprocal proportions
4. Law of multiple proportions

19. The law of definite proportions is not applicable to nitrogen oxide because:

1. Nitrogen atomic weight is not constant
2. Nitrogen molecular weight is variable
3. Nitrogen forms multiple compounds with oxygen
4. Oxygen atomic weight is variable

20. The oxides of nitrogen contain 63.65%, 46.69% & 30.46% of nitrogen by weight, respectively. This data illustrates the law of:

1. Constant proportions
2. Multiple proportions
3. Law of gaseous volumes
4. Conservation of mass

21. Cu forms two oxides cuprous and cupric oxides, which law can be proved by the weights of Cu and O?

1. Constant composition
2. Multiple proportions
3. Reciprocal proportions
4. Definite proportions

22. A sample of pure nitrogen dioxide, irrespective of its source contains 27.27% nitrogen and 72.34% oxygen. The data support:

1. Law of constant composition
2. Law of conservation of mass
3. Law of reciprocal proportions
4. Law of multiple proportions

23. The law of conservation of mass holds good for all of the following except.

1. All chemical reactions
2. Nuclear reaction
3. Endothermic reactions
4. Exothermic reactions

24. The % of copper and oxygen in samples of CuO obtained by different methods was found to be the same. This proves the law of:

1. Constant Proportion
2. Reciprocal Proportion
3. Multiple Proportion
4. Conservation of mass

25. “The total mass of reactants is always equal to the total mass of products in a chemical reaction”. This statement is known as:

1. Law of conservation of mass
2. Law of definite proportions
3. Law of equivalent weights
4. Law of combining masses

26. One sample of atmospheric air is found to have 0.03% of CO2 and another sample has 0.04%. This is evidence that:

1. The law of constant composition is not always true
2. The law of multiple proportions is true
3. Air is a compound
4. Air is a mixture

27. Avogadro’s law states an equal volume of gases that contain the same number of:

1. Crystals
2. Molecules
3. States
4. Pressure units

28. Which of the following represents Avogadro’s hypothesis?

1. Equal volumes of all gases under the same condition of temperature & pressure contain an equal number of atoms
2. Equal volumes of all gases under the same condition of temperature & pressure contain an equal number of molecules.
3. Gases react together in volumes that bear a simple ratio to one another
4. The rates of diffusion of gases are inversely proportional to the square root of densities

29. Assertion (A): At 273 K & 1 bar 22.4 L of both oxygen & CO2 contains an equal number of molecules.

Reason (R): According to Avogadro’s law, at a constant temperature & pressure equal volumes of all gases contain an equal number of molecules.

1. Both Assertion (A) and Reason (R) are true & Reason (R) is the correct explanation of Assertion (A).
2. Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
3. Assertion (A) is true but Reason (R) is false.
4. Assertion (A) is false but Reason (R) is false.

30. Assertion (A): The law of conservation of mass isn’t explained in Dalton’s atomic theory.

Reason (R): Dalton said that the reorganization of atoms is involved in chemical reactions.

1. Both Assertion (A) and Reason (R) are true & Reason (R) is the correct explanation of Assertion (A).
2. Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
3. Assertion (A) is true but Reason (R) is false.
4. Assertion (A) is false but Reason (R) is false.

31. Which idea about Dalton’s atom model is incorrect?

1. Atoms are structureless.
2. Atoms combine by sharing electrons.
3. Atoms cannot be created nor be destroyed.
4. Atoms combine in simple whole-number ratios.

32. Which of the following postulates of Dalton’s atomic theory explains the law of multiple proportions?

1. Atoms of two elements may combine with one another to form more than one compound.
2. Atoms combine in the ratio of small whole numbers to form compounds.
3. The relative number and kinds of atoms are constant in a given compound.
4. All of these

33. In water, the ratio of hydrogen to oxygen by mass is given as 1: 8. The mass of oxygen required for 5 g of hydrogen is?

1. 10gm
2. 20gm
3. 40gm
4. 5gm

34. Indium (atomic mass = 114.82) has two naturally occurring isotopes, the predominant one form has an isotopic mass of 114.9041 and an abundance of 95.72%.

Which of the following isotopic masses is most likely for the other isotope?

1. 112.94
2. 115.90
3. 113.90
4. 114.90