s-Block elements

Which of these elements has the greater melting point?

• Aluminium

• Phosphorus

• Magnesium

• Silicon

Going across Period 3 from Na to Cl,

• the atomic radius of the elements increases

• the ionisation energy of the element decreases

• the electropositivity of the elements decrease

• the reducing power of the elements increases

What is the trend of acid-base nature with increasing atomic number of Period 3 oxides?

• Acidic, basic, amphoteric

• Basic, amphoteric, acidic

• Basic, acidic, amphoteric

• Acidic, amphoteric, basic

The decrease in the ionic radius from P^3- to Cl^- is caused by

• the increase in nuclear charge and increase in the number of electrons

• the increase in nuclear charge while the electrons remains constant

• the increase in the number of electrons while the nuclear charge remains constant

• the decrease in the number of electrons while the nuclear charge remains constant

Which of the following statements is false?

• Group 1 and Group 2 oxides reacts with water to form metal hydroxide only

• Group 1 and Group 2 metals reacts with water to form metal hydroxide only

• Group 1 and Group 2 hydroxides reacts with acid to form salt and water only

• Group 1 and Group 2 oxides reacts with water to form salt and water only

M is an amphoteric oxide of Period 3. The first three ionisation energy of M increase gradually but the fourth ionisation energy increase sharply. Why the fourth ionisation energy of M is higher than expected?

• M has four valence electrons.

• The electronic configuration of M is 1s²2s²2p⁶3s²3p¹

• M is a s-block element

• M is a non-metal

Alkaline earth metals P and Q have 4 shells and 5 shells respectively. Choose correct statement about P and Q.

• P has a larger atomic radius than Q

• P has a higher ionisation energy than Q

• P is more reactive than Q

• P is a better conductor than Q

Which of the following statements is not true about Group 1 elements?

• The elements form basic oxides

• The elements have the same oxidation number

• Reactivity of elements increases down the group

• The ionisation energy increases down the group

The following properties are the properties of Magnesium and its oxides except

• Magnesium reacts with cold water to produce magnesium hydroxide and hydrogen gas

• Magnesium oxide is a basic oxide

• Magnesium oxide used as refractory lining of for furnace

• Magnesium can conduct electricity

The following uses of the elements are correct except for

• CaO - Spread on agricultural land to neutralise excess basicity

• CaSO4- Used as plaster for broken limbs

• Mg- Used in aircraft as it has lightweight and low density

• NaOH- Used in the manufacture of soaps