An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following
(a) Mg
(b) Na
(c) P
(d) Ca

NCERT Class X
Science - Exemplar Problems

Chapter_Metals and Non Metals

1

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2015-05-29T14:14:02+05:30

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(b) Na

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