Which of the statements about glass are correct?1. glass is a super-cooled liquid having infinite viscosity.2. violet coloured glass is obtained by adding MnO2.3. glass is a man-made silicate.4. glass is a crystalline substance. Select the correct answer using the codes given below.

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Which of the statements about glass are correct?<br />1. glass is a super-cooled liquid having infinite viscosity.<br />2. violet coloured glass is obtained by adding MnO<sub>2</sub>.<br />3. glass is a man-made silicate.<br />4. glass is a crystalline substance. Select the correct answer using the codes given below.