Pick up the correct statement from the following:

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Question:
Pick up the correct statement from the following:

1.The percentage of absorption for firebricks varies from 5 to 10

2.The percentage of silica in silica bricks is to the extent of about 95 to 97 percent

3.Roughly 1 to 2 percent of lime in silica bricks is added to act as binding material

4.All the above.

Posted Date:-2021-03-26 07:40:44

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