CBSE
For the second period elements the correct increasing order of first ionisation enthalpy is:
Li < B < Be < C < O < N < F < Ne
Li < B < Be < C < N < O < F < Ne
Li < Be < B < C < O < N < F < Ne
Li < Be < B < C < N < O < F < Ne
Which of the following is an amphoteric hydroxide?
Ca(OH)2
Mg(OH)2
Be(OH)2
Sr(OH)2
Which azide is explosive?
Ba(N3)2
NaN3
KN3
Mg3N2
Which of the following is soluble in water?
Br
Sr
Mg
Ba
Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor. M is :
Mg
Ca
Sr
Be