Select the statement(s) which are NOT correct with respect to burnt clay bricks.
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- Lime (<10% of clay) in carbonated form lowers the fusion point of bricks.
- Magnesia (>1% of clay) imparts red colour to the bricks.
- Iron Pyrites tend to oxidize and decompose the brick during burning.
- Alkalis (alkaline salts) when present in excess (>10% of clay) decrease the probability of efflorescence.
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