Which alloy is used to prepare surgical instruments?

Which of the following observations are correct when calcium is treated with water?
$(i)$ It reacts violently with water.
(ii) It reacts less violently with water.
(iii) The bubbles of hydrogen gas formed stick to the surface of the calcium.
(iv) The calcium starts floating.

Which of the following elements does not lose an electron easily?

Which metal does not react even with hot water or steam?

Which among the following statements is incorrect for magnesium metal?

Which of the following pairs will give displacement reactions?