Chemistry Chapter 1 Entry Test MCQs
26. If we take same mass of following elements, largest number of atoms will be in
a. Ni (59)
b. Fe (56)
c. Mn (55)
d. Ca (40)
27. The number of moles of CH4 which contains 3.0g of Carbon
a. 0.5
b. 1.0
c. 0.25
d. 0.75
28. 4g H2 reacts with 32.0g O2 to produce water. Which of the following statements is correct?
a. O2-non-limiting reactant
b. H2-limiting reactant
c. 1 mole water is produced
d. 2.0 mole water is produced
29. 2.8g of N2 molecule contains number of chemical bonds
a. 1.8 × 1023
b. 6.02 × 1022
c. 1.8 × 1022
d. 1.204 × 1023
30. The number of moles of KMnO4 that contain 1 mole of oxygen
a. 0.25 moles
b. 2 moles
c. 1.5 moles
d. 0.5 moles
31. 1 mole of CH3OH and C2H5OH have equal number
a. O-Atoms
b. C-Atoms
c. Electrons
d. H-atoms
32. The number of hydrogen atoms in 36 g of NH4+1 is approximately
a. 4NA
b. 2NA
c. 8NA
d. 6NA
33. A sample of 100cm3 of dilute H2SO4 contains 0.1 moles of acid. What is hydrogen ion concentration in the solution per dm3?
a. 0.25 moles
b. 2 moles
c. 1 mole
d. 0.50 moles
34. The number of oxygen atoms contained in 1000 g of water is
a. 6.692 x 1025
b. 6.02 x 1023
c. 55.5
d. 3.3410 x 1025
35. The ratio of molar mass of a substance and the Avogadro’s number is equal to?
a. molar volume of gas
b. mass of one mole of substance
c. volume of one particle of gas
d. mass of one particle of gas
36. One litre oxygen gas at STP will weigh
a. 11.2g
b. 1.43g
c. 2.4g
d. 5.24g
37. 2.24 dm3 of CO gas has mass
a. 1.2g
b. 28g
c. 2.5g
d. 2.8g
38. The ratio of volume between 4 moles of H2 and 16g of CH4
a. 1:8
b. 1:2
c. 1:4
d. 4:1
39. The no. of valence electrons in 1 mole of He are
a. 1/2×6.02 x 1024
b. 0.25×6.02 x 1022
c. 2×3.01 x 1023
d. 2×6.02 x 1023
40. Which one of the following compounds has highest % of ‘C’?
a. CH4
b. CO
c. HCOOH
d. CO2
41. Molar volume is the volume occupied by 1 mole of
a. methane at STP
b. ammonia at 1000C
c. methane at 500C
d. ammonia at 100C
42. Equal volumes of N2O and CO2 are taken in identical conditions, the correct relation between the masses of two gases is
a. N2O = CO2
b. N2O > CO2
c. N2O = CO2
d. N2O < CO2
43. Which of the following has maximum number of molecules?
a. 23g of NO2
b. 16g of O2
c. 2g of H2
d. 7g of N2
44. Which of the following has same number of moles?
a. 12g of C, 20g of Mg
b. 12g of C, 10g of Mg
c. 15g of C, 24g of Mg
d. 15g of C, 30g of Mg
45. Avogadro’s number is the number of molecules present in
a. Gram molecular mass
b. 1 dm3 of molecule
c. 1 g of atom
d. 1 g of formula mass
46. 4 g of CH4 gas has molar volume at S.T.P
a. 11.2 cm3
b. 22.414 cm3
c. 22414 cm3
d. 5.60 dm3
47. 2.8g of N2 molecules contain number of chemical bonds
a. 6.02 × 1022
b. 1.8 × 1023
c. 1.8 × 1022
d. 1.204 × 1023
48. The total number of atoms in 9g of water are
a. 6.02 × 1023
b. 3.01 × 1023
c. 9.03 × 1023
d. 4.51 × 1023
49. How many moles of neutron are present in one mole of heavy water?
a. 8
b. 10
c. 20
d. 18
50. How many chlorine atoms are in 4 moles of Cl2?
a. 8 × 6.022 × 1023 atoms
b. 4 × 6.022 × 1023 atoms
c. 2 × 6.02 × 1022 atoms
d. 2 × 6.022´1023 atoms