Whether law of conservation of linear momentum remas conserved in case of internal explosion
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ORIGINAL ANSWER :
Neglecting air resistance, and until any of the fragments of the bomb reach the ground, the centre of mass of the bomb follows the same trajectory as it would if the bomb did not explode - ie part of a parabola.
Conservation of linear momentum does not apply here because there is an outside force (gravity) which changes the magnitude and direction of the total momentum. However, all of the forces in the explosion are internal forces (action/ reaction) which do not alter the motion of the centre of mass and do not affect total momentum.
The explosion does not change the total mass of the bomb.
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