(A) mg cm-3
(B) g cm-3
(C) g dm-3
(D) kg dm-3
___ is an electron deficient molecule?
(A) NH3
(B) BF3
(C) N2
(D) O2
C2H2 molecule have ___ covalent bonds.
(A) 2
(B) 3
(C) 4
(D) 5
4th and 5th period of the long form of periodic table are called?
(A) Normal periods
(B) Short periods
(C) Long periods
(D) Very long periods
___ halegen have lowest electronegativity?
(A) Chlorine
(B) Fluorine
(C) Bromine
(D) Iodine
Which cell consists of three sub shells?
(A) L
(B) M
(C) N
(D) O
The molar mass of H2SO4 is?
(A) 98 amu
(B) 98 g
(C) 9.8 g
(D) 9.8 amu
___ element is found in most abundance in earth crust.
(A) Oxygen
(B) Aluminium
(C) Silicon
(D) Iron