50-100

Which shows variable valency

• d - block elements

• a - block elements

• c - block elements

• e - block elements

Most reducing agent is

• D

• K

• F

• G

If the valency shell electronic structure for an element is ns² np⁵, this element will belong to the group of

• Alkaline earth metals

• Noble gases

• Halogens

• Alkali metals

If the valency shell electronic structure for an element is ns¹, this element will belong to the group of

• Noble gases

• Alkaline earth metals

• Halogens

• Alkali metals

If the valency shell electronic structure for an element is ns²np⁶, this element will belong to the group of

• Halogens

• Alkali metals

• Alkaline earth metals

• Noble gases

Which will show maximum non-metallic character

• B

• F

• N

• O

Which of the following halogen acids is least acidic

• HI

• HF

• HBr

• HCl

Variable valency in general, is exhibited Ьу

• Alkaline earth metals

• Noble gases

• Transition elements

• Alkali metals

An element of atomic weight 40 has 2, 8, 8, 2 as the electronic configuration. Which one of the following statements regarding this element is correct

• It belongs to group 2 of the periodic table

• It is a non-metal.

• . It is an alkali metal.

• The formula of its oxide is MO

Which of the following oxides is most basic

• Al₂O₃

• MgO

• SiO₂

• Na₂O