Q.1 In mass spectrometer, detector or collector measures the:
A) Masses of isotopes C) Relative abundances of isotopes
B) Percentages of isotopes D) Mass numbers of isotopes
Q.2 How many 'Cl' (chlorine) atoms are in two moles of chlorine?
A) 2 × 6.02 × 10ˉ23 atoms C) 2 × 1023 atoms
B) 35.5 × 6.02 × 1023 atoms D) 2 × 6.02 × 1023 atoms
2012
Q.3 An organic compound has empirical formula C3H3O, if molar mass of compound is 110.15 gmol-1.
The molecular formula of this organic compound is (A, of C=12, H=1.008 and O=16)
A) C6H6O2 C) C9H9O3
C) C3H3O D) C6H6O3
Q.4 When 8 grams (4 moles) of H2 react with 2 moles of O2, how many moles of water will be
formed?
A) Five C) Six
B) Four D) Three
A) Masses of isotopes C) Relative abundances of isotopes
B) Percentages of isotopes D) Mass numbers of isotopes
Q.2 How many 'Cl' (chlorine) atoms are in two moles of chlorine?
A) 2 × 6.02 × 10ˉ23 atoms C) 2 × 1023 atoms
B) 35.5 × 6.02 × 1023 atoms D) 2 × 6.02 × 1023 atoms
2012
Q.3 An organic compound has empirical formula C3H3O, if molar mass of compound is 110.15 gmol-1.
The molecular formula of this organic compound is (A, of C=12, H=1.008 and O=16)
A) C6H6O2 C) C9H9O3
C) C3H3O D) C6H6O3
Q.4 When 8 grams (4 moles) of H2 react with 2 moles of O2, how many moles of water will be
formed?
A) Five C) Six
B) Four D) Three
Q.5 Hydrogen burns in chlorine to produce hydrogen chloride. The ratio of masses of reactants in
| chemical reaction is: | H2 + Cl2 |
| A) 1:35.5 | C) 1:71 |
2HCl
B) 2:35.5 D) 2:70