JEE Chemistry Online Test Some Basic Concepts Of Chemistry Set G

1. If maximum fluoride ion presence was set to be 4 ppm number of moles of fluoride in 10 ml drinking water ?

2. 10 mL of 2(M) NaOH solution is added to 200 mL of 0.5 (M) of NaOH solution. What is the final concentration ?

3. Which of the following option represents correct limiting reagents in reactions (i), (ii) and (iii) respectively.

4. Fat is an important source of energy and water, this is important for the desert animals like camel which store fat in its hump and provide water and energy. How many grams and moles of H₂O are produced from the combustion of fat C₅₇H₁₁₀O₆ from 450 gram of fat stored in hump of camel ?

5. How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl ?

6.

7. The mass of BaCO₃ produced when excess CO₂ is bubbled through a solution of 0.205 mol Ba(OH)₂ is

8. Assuming fully decomposed, the volume of CO₂ released at STP on heating 9.85 g of BaCO₃ (Atomic mass, Ba = 137) will be

9.

10. Which of the following is the correct empirical and molecular formulae of a compound, if the molecular mass of a compound is 93 and compound containing 77.43% of
C, 7.53% of H and 15.05% of N ?

11. Which of the following is the correct empirical and molecular formulae of a compound, if the molecular mass of a compound is 80 and compound contains 60% of C, 5% of H and 35% of N ?

12. A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g. of CO2. The empirical formula of the hydrocarbon is

13. The empirical formula of an acid is CH₂O₂, the probable molecular formula of acid may be :

14. In a compound C, H and N atoms are present in 9 : 1 : 3.5 by weight. Molecular weight of compound is 108. Molecular formula of compound is

15. Which one of the following is the lightest?

16. If 1.5 moles of oxygen combines with Al to form Al₂O₃, the mass of Al in g [Atomic mass of Al = 27] used in the reaction is

17. Arrange the following in the order of increasing mass (atomic
mass: O = 16, Cu = 63, N = 14) I. one atom of oxygen
II. one atom of nitrogen
III. 1 × 10^–10 mole of oxygen
IV. 1 × 10^–10 mole of copper

18. How much time (in hours) would it take to distribute one Avogadro number of wheat grains if 10²⁰ grains are distributed each second ?

19. 1 c.c. N₂O at NTP contains

20. The number of atoms in 0.1 mol of a triatomic gas is :
(N_A = 6.02 ×10²³ mol^–1)

21. Volume occupied by one molecule of water

22. How many moles of magnesium phosphate, Mg₃(PO₄)2 will contain 0.25 mole of oxygen atoms?

23. The maximum number of molecules are present in

24. If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

25. Which one of the following sets of compounds correctly illustrate the law of reciprocal proportions?

26. What are the significant figure(s) in a broken “ruler” show below?

27. Assertion : The empirical mass of ethene is half of its molecular mass.
Reason : The empirical formula represents the simplest whole number ratio of various atoms present in a compound

28. Assertion : Equal moles of different substances containsame number of constituent particles.
Reason : Equal weights of different substances contain the same number of constituent particles

29. Assertion : Volume of a gas is inversely proportional to the number of moles of gas.
Reason : The ratio by volume of gaseous reactants and products is in agreement with their mole ratio

30. Assertion : One atomic mass unit is defined as one twelfth of the mass of one carbon - 12 atom.
Reason : Carbon-12 isotope is the most abundunt isotope of carbon and has been chosen as standard.