Reactivity Trends (Group 2)

Q.

Hydroxides of Alkali Metals And Most Alkaline Earth Metals Are Strong Bases.

1. True
2. False

Q. what is the order of thermal stability of halide of alkali meta

Q. For 2SO2 + O2 <> 2SO3 Initial moles of of SO2 and O2 are 8 and 4 respectively.If degree of dissociation of SO2 is 50% then find degree of dissociation of O2 and mole fraction of SO3 at equilibrium.

Q. Arrange the following alkali metal carbonates in increasing order of their thermal stability:

1. $L{i}_{2}C{O}_3<N{a}_{2}C{O}_3<K_{2}C{O}_3<R{b}_{2}C{O}_3<C{s}_{2}C{O}_3$
2. None of these
3. $L{i}_{2}C{O}_3<K_{2}C{O}_3<N{a}_{2}C{O}_3<R{b}_{2}C{O}_3<C{s}_{2}C{O}_3$
4. $C{s}_{2}C{O}_3<N{a}_{2}C{O}_3<K_{2}C{O}_3<R{b}_{2}C{O}_3<L{i}_{2}C{O}_3$

Q. In the reaction A+2B_ 2C if 2 moles of A and 3 moles of B and 2 moles of C are present in 2 l flask and equilibrium concentration of C is 0.5 moles find the equilibrium constant.hiw to find equilibrium concentration

Q. A metal oxide contains 80% metal. What is the equivalent weight of the metal ?

Q. An alloy of gold and silver contains 38.5% silver by mass and has a density of 14.6 g.mL –1 . What is the molar concentration of silver in this alloy?

Q.

HCl is added to following oxides. Which one would give $H_2{O}_2$?

1. MnO₂

2. PbO₂

3. BaO

4. None of these

Q.

Carbonates of alkali and alkaline earth metals differ in:

1. Stability

2. All the these

3. Solubility

4. Lattice enthalpy

Q. Magnesium combines with nitrogen to form a nitride, which reacts with water to form a colourless gas. The gas is:

1. $N{H}_3$
2. $N_{2}O$
3. $NO$
4. $N{O}_2$

Q. Which one is not true about carbides?

1. $A{l}_4{C}_3$ is methanide and produces methane on hydrolysis
2. $M{g}_2{C}_3$ is propylide and produces propane on hydrolysis
3. $Ca{C}_2$ and $N{a}_2{C}_2$ are acetylides and they produce acetylene on hydrolysis
4. $B{e}_{2}C$ gives methane on hydrolysis

Q.

Use the periodic table to answer the following questions.

(a) Identify an element with five electrons in the outer subshell.

(b) Identify an element that would tend to lose two electrons.

(c) Identify an element that would tend to gain two electrons.

(d) Identify the group having metal, non-metal, liquid as well as gas at the room temperature.

Q.

Which alkaline earth metal sulphates have the highest solubility in water?

Q. arrange in increasing solubility in water : Mg(OH)₂ , Sr(OH)₂, Ba(OH)₂, _​ Ca(OH)₂

Q. What are the reason of thermal stability order, basicity order and Melting point order of group 15 hydride?

Q. if an aqueous solution of Na_2CO_3 , mole fraction of Na_2CO_3 is 0.2, the molality of the solution is

Q.

Among the following oxides, the one which is most basic is:

1. $ZnO$

2. $MgO$

3. $A{l}_2{O}_3$

4. $N_2{O}_3$

Q.

Solubility of alkaline earth metal hydroxides increases down the group. Give reason