Entry Test MCQ :: s-BLOCK ELEMENTS

@ : Home > Chemistry > s-BLOCK ELEMENTS

21.

Which one of the following carbonate is water insoluble?

A.	Na2CO3	B.	K2CO3
C.	(NH4)2CO3	D.	CaCO3

22.

The deliquescence is a property in which a solid

A.	Absorbs moisture and remains solid	B.	Absorbs moisture and turns to liquid form
C.	Loses water of crystallization	D.	Increases the number of water of crystallization

23.

In diaphragm cell hydrogen is discharged by the reduction of

A.	Water	B.	HCI
C.	Na+	D.	NaCl

24.

In diaphragm cell level of brine in anode compartment is kept slightly higher which prevents

A.	Hydroxide ions to reach anode	B.	Chlorine gas to mix
C.	Cathode to decay	D.	All of the above

25.

Gypsum is applied to the soil as a source of

A.	Ca and P	B.	S and P
C.	Ca and S	D.	we could not apply

26.

Alkali and alkaline earth metals impart colours when heated over burner. It is due to

A.	Smaller electronegativity of alkali metals	B.	Smaller ionic radius of these metals
C.	De-excitation of electrons from higher energy levels to low energy level	D.	Excitation of electrons from low energy levels to higher energy levels

27.

Which one of the following alkali metals forms only normal oxide when it reacts with O2?

A.	Lithium	B.	Sodium
C.	Potassium	D.	Rubidium

28.

First ionization potential of alkaline earth metal is greater than alkali metals because

A.	They are more reactive	B.	They have greater atomic radii
C.	They have smaller atomic sizes	D.	All

29.

Which one of the following pairs shown diagonal relationship in the periodic table?

A.	Sodium and Lithium	B.	Lithium and magnesium
C.	Lithium and beryllium	D.	Boron and Beryllium

30.

NaOH is named as caustic soda because

A.	It corrodes the organic tissues	B.	It is used in soda water
C.	It reacts with chlorine gas	D.	It reacts with fats to form soap