1. ___ SnO2+ __ H2 → ___ Sn + ___ H2O 2 SnO2 + 2 H2 → 2 Sn + H2O
SnO2 + 2 H2-Sn + 2 H2O
SnO2 + Hz-Sn + 2 H2O
2 SnO2 + H22Sn + H2O

answer; i believe that the correct answer is (a); a large rock being weathered by wind and rain;

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.