51.  The unit is equivalent to

A.

B.

C.

D. None of these

Answer : Option A

Explanation :

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52.  The density of Al metal is 2.7 . An irregularly shaped piece of aluminium weighing 40.0g is added to a 100mL graduated cylinder containing 50.0mL of water. upto what height the water level will rise in the cylinder ?

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

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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?

A. 50%

B. 5%

C. 43%

D. 47%

Answer : Option D

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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

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55.  What weight of CuO will be required to provide 200Kg copper

A. 200Kg

B. 79.5Kg

C. 250Kg

D. 100Kg

Answer : Option C

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56.  

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 is half than that of its dimer phosphoroushexoxide for each of the elements present in them.

A. T, F

B. F, T

C. T, T

D. F, F

Answer : Option A

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57.  Impure sample of ZnS contains 42.34% Zn. What is the percentage of pure ZnS in the smaple ?

A. 67%

B. 63%

C. 58%

D. 37%

Answer : Option B

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58.  If the atomic mass of carbon were set at 50 amu, what would be the value of Avogadro’s number ?

A.

B.

C.

D. None of these

Answer : Option B

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59.  For which of the following compounds molecular weigh cannot be determined from atomic weights ?

A.

B.

C.

D. None of these

Answer : Option D

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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

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