The atoms of same element having same atomic number but different mass number are called____________________?

A. Isobars
B. Isomers
C. Isotopes
D. Isotropes

Which of the following ion is stable in aqueous solution ?

A. H+
B. H-
C. Cl-
D. All are stable

An element has electronic conviguration 1s2 2s2 2p2. It belongs to__________________?

A. Group ii-a
B. Group iv-a
C. Group vii-a
D. Group vi-a

The atomic radii decreases by increasing atomic number in________________?

A. Alkali metal
B. Alkaline earth metal
C. Elements from li to ne
D. Halogens

Shielding effect across the period_________________?

A. Increases
B. Decreases
C. Can not be predicted
D. Remains constant

Higher value of electron affinity means__________________?

A. Atom will lose electron easily
B. Atom will gain electron easily
C. Atom may form di-positive ion
D. The reason is unknown

Melting points of VII-A group elements down the group ____________________?

A. Increase
B. Decrease
C. Remain constant
D. No regular trend

Many properties of an element and its compounds can be predicted from the position of the element in the periodic table. What property could not be predicted in this way ?

A. The nature of its oxides
B. The charge on its ions
C. The formula of its oxide
D. Its number of isotopes

The Distance of Neptune From Sun is ________ astronomical unit.

A. 28
B. 30
C. 32
D. None of these

Deficiency of vitamin B1 is causes__________?

A. Rickets
B. Bone infection
C. Beriberi
D. Myopia