Given below is an approximate composition of a substance: Ca0-60-70% Si02-20-25% Al20-5-10% Fe203-2-3% The substance is

examrobotsa's picture

Submitted by examrobotsa on

Q: 84 (NDA-II/2012)
Given below is an approximate composition of a substance: Ca0-60-70% Si02-20-25% Al20-5-10% Fe203-2-3% The substance is

question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,4,7,5,4,2,0

keywords: 

{'approximate composition': [0, 0, 0, 1], 'plaster': [0, 0, 1, 0], 'cement': [0, 0, 1, 4], 'quartz': [0, 0, 0, 1], 'substance': [2, 1, 7, 7], 'marble stone': [0, 0, 0, 1], 'ca0': [0, 0, 0, 1]}

The given composition of the substance consists of the elements Ca, Si, Al, and Fe, along with their respective percentages.

Option 1: Plaster of Paris

Plaster of Paris mainly consists of calcium sulfate hemihydrate, which does not match the composition mentioned. Therefore, option 1 is not the correct answer.

Option 2: Cement

Cement is mainly composed of calcium, silicon, aluminum, and iron, which aligns with the provided composition. The given percentages of Ca, Si, Al, and Fe fall within the range of the approximate composition mentioned. Therefore, option 2 is the correct answer.

Option 3: Marble stone

Marble stone mainly consists of calcium carbonate, which does not match the composition mentioned. Therefore, option 3 is not the correct answer.

Option 4: Quartz

Quartz is composed mainly of silicon dioxide (SiO2). While the composition does mention SiO2, the presence of other elements like Ca, Al, and Fe does not align with the composition of quartz. Therefore, option 4 is not the correct answer.

In conclusion, the correct answer is option 2: cement, as it matches the given composition of the substance.