Match the following property.
A B
(i) Law of Multiple proportions. (p) Richter
(ii) Law of Combining volumes (q) Proust
(iii) Law of Reciprocal proportions. (r) GayLussac
(iv) Law of Constant composition. (s) Dalton
A. i - s, ii - p, iii - r, iv - q
B. i - s, ii - r, iii - p, iv - q
C. i - s, ii - r, iii - q, iv - p
D. i - q, ii - r, iii - p, iv - s
Answer : Option B
32. Two oxides of a metal ‘M’ contain 27.6% and 30.0% of oxygen respectively. If the formula of the first oxide is
A.
B.
C.
D.
Answer : Option A
Explanation :
Let ‘x’ be the atomic mass of metal ‘M’
In the oixde
For second oxide, the mass of ‘M’ = 70 and that of ‘O’ =30
33. Naturally occuring Boron consists of two isotopes having atomic masses 10.01 and 11.01 respectively. Calculate the percentage of both the isotopes in natural Boron (Atomic mass of natural Boron = 10.81)
A. 20% and 80%
B. 80% and 20%
C. 25% and 75%
D. 75% and 25%
Answer : Option A
Explanation :
Let the % of isotope with atomic mass 10.01 be ‘x’
⇒ Avg at mass =
34. Calculate the mass percent of Na and S in sodium sulphate.
A. Na = 16.2%, S = 22.54%
B. Na = 32.39%, S = 11.26%
C. Na = 22.54%, S = 32.39%
D. Na = 32.39%, S = 22.54%
Answer : Option D
35. Determine the empirical formula of an oxide of iron which has 69.9% iron and 30.1% oxygen by mass.
36. Calculate the amount of carbon dioxide that can be produced when 1 mole of carbon is burnt in 16 g of dioxygen.
37. Calculate the concentration of nitric acid in moles per liter which has a density , 1.41 g/mL. %W/W of nitric acid is
A. 15.44M
B. 0.064M
C. 0.077M
D. 12.87M
Answer : Option A
Explanation :
→ 69% w/w means 100 g nitric acid soution contain 69 g of nitric acid by mass.
→ Vol. of 100 g nitric acid solution =
38. In a reaction :
A.
B.
C.
D.
Answer : Option D
Explanation :
28 g 6 g
2000 g (?)
→ But we are given 1000 g
39. Calculate the number of sulphate ions in 100mL of 0.001M ammonium sulphate solution.
A.
B.
C.
D.
Answer : Option B
Explanation :
→ No of moles of
= 0.001 x 0.1 = 0.0001
40. Calculate the molarity of a solution of ethanol in water in which mole fraction of ethanol is 0.040.