Which of the following is important component of chlorophyll?
a) beryllium
b) barium
c) calcium
d) magnesium
Calcium is found in nature in the form of……
a) sulphate
b) fluoride
c) phosphate
d) both b and c
Calcium is the important constituent of living organism and is found in………
a) bones
b) teeth
c) egg shells
d) all of these
Which of the following alkaline earth metal is rare?
a) barium
b) calcium
c) radium
d) magnesium
Which of the following alkaline earth metal is radio active in nature?
a) barium
b) calcium
c) radium
d) magnesium
Why lithium has higher ionization energy than other alkali metals?
a) smaller size
b) less shielding effect
c) greater nuclear charge
d) both a and b
