Which of the following equations is balanced correctly?

i. 2 ag2o → 4 ag + o2

ii. cu + h2o → cuo + h2

iii. zn + hcl → zncl2 + h2

iv. 2 c4h10 + 13 o2 → 8 co2 + 10 h2o

The infrared (ir) and the ultraviolet(uv) represent the two extremities of the visible spectrum (400-700nm). while ir represents electromagnetic radiation with wavelengths longer than those of visible light, uv represents wavelengths shorter than visible light

The salt in the sea water dehydrated the sailor because her body could not take in the amount to salt in the sea water