52. The density of Al metal is 2.7
A. 14.8mL
B. 79.6mL
C. 64.8mL
D. 50mL
Answer : Option C
Explanation :
→
→
→ Water level in cylinder = 50+ 14.8 = 64.8 mL
53. A sample of clay after drying partially was found to contain 50% silica and 7% water.The original sample of clay had 12% water, What is the percentage of silica in the original sample?
54. In which of the following pairs percent composition of element is not same ?
A. Benzene and ethyne
B. But - 2 - ene and Cyclobutane
C. Glucose and fructose
D. Phenol and ethanol
Answer : Option D
55. What weight of CuO will be required to provide 200Kg copper
Choose the proper option after studying following statement (T = True, F = False)
1. The percent composition of vinyl chloride and its polymer PVC are same.
2. The perecent compostion of phosphorous trioxide
57. Impure sample of ZnS contains 42.34% Zn. What is the percentage of pure ZnS in the smaple ?
58. If the atomic mass of carbon were set at 50 amu, what would be the value of Avogadro’s number ?
59. For which of the following compounds molecular weigh cannot be determined from atomic weights ?
60. Which one of the following contains greatest number of oxygen atoms ?
A. 1.0 g of O atoms
B. 1.0 g of
C. 1.0 g of
D. All have same number of atoms
Answer : Option D