Reactivity with Air and Water (Group 2)

Q.

What coefficient of ${\mathrm{AgNO}}_3$ is required to balance the following equation? $\mathrm{Cu}+{\mathrm{AgNO}}_3\to \mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2+\mathrm{Ag}$

Q.

The exact volumes of 1 M $\mathrm{NaOH}$ solution required to neutralize 50 mL of 1 M ${\mathrm{H}}_3{\mathrm{PO}}_3$ solution and 100 mL of 2 M ${\mathrm{H}}_3{\mathrm{PO}}_2$ solution, respectively, are:

1. 100 mL and 50 mL

2. 50 mL and 50 mL

3. 100 mL and 100 mL

4. 100 mL and 200 mL

Q. The basic character of hydroxides of alkaline earth metals increase in the order:

1. $Mg(OH{)}_2<Be(OH{)}_2<Ca(OH{)}_2<Ba(OH{)}_2$
2. $Be(OH{)}_2<Mg(OH{)}_2<Ca(OH{)}_2<Ba(OH{)}_2$
3. $Ba(OH{)}_2<Ca(OH{)}_2<Be(OH{)}_2<Mg(OH{)}_2$
4. $Ba(OH{)}_2<Ca(OH{)}_2<Mg(OH{)}_2<Be(OH{)}_2$

Q. Among the following oxides, the one which is most basic is

1. MgO
2. ZnO
3. 
4. 

Q.

What is the name of $\mathrm{Ca}{\left({\mathrm{HCO}}_3\right)}_2$?

Q. Magnesium powder burns in air to give

1. $MgO$ and $M{g}_3{N}_2$
2. $Mg(N{O}_3{)}_2$ and $M{g}_3{N}_2$
3. $MgO$ only
4. $MgO$ and $Mg(N{O}_3{)}_2$

Q.

Which of the following compounds is a peroxide?

1. $K{O}_2$

2. $Ba{O}_2$

3. $Mn{O}_2$

4. $N{O}_2$

Q. A metal $M$ readily forms water soluble sulphate $MS{O}_4$, water insoluble hydroxide $M(OH{)}_2$ and oxide $MO$ which becomes inert on heating. The hydroxide is soluble in $NaOH$. The $M$ is

1. $Be$
2. $Mg$
3. $Ca$
4. $Sr$

Q.

Why does Beryllium not react with water?

Q. A metal M readily forms water soluble sulphate $MS{O}_4$ water insoluble hydroxide $M(OH{)}_2$ and oxide MO which becomes inert on heating.The hydroxide is soluble in NaOH. The metal is

1. Be
2. Mg
3. Ca
4. Sr

Q. Hydrogen peroxide molecules are:

1. Diatomic and form $H{O}_2^{-}$ ions
2. Diatomic and form $X^{-}$ ions
3. Monatomic and form $X^{2-}$ ions
4. Monoatomic and form $X^{-}$ ions

Q. Which of the following does not react with water?

1. Ba

2. Ca

3. Sr

4. Be

Q. Oxides and hydroxide of beryllium in group 2 is

1. Acidic
2. None of these
3. Basic
4. Amphoteric

Q.

Explain why reactivity of lithium with water is less vigorous than sodium

Q.

Metals form basic hydroxides. Which of the following metal hydroxide is the least basic?
(a) $Mg(OH{)}_2$ (b) $Ca(OH{)}_2$ (c) $Sr(OH{)}_2$ (d) $Ba(OH{)}_2$

Q.

What would you observe in each of the following cases?
Water is added to the product formed, when aluminium is burnt in a jar of nitrogen gas.

Q.

The species that does not contain peroxide ions is:

1. $Pb{O}_2$

2. $H_2{O}_2$

3. $Sr{O}_2$

4. $Ba{O}_2$

Q.

Name an element from group 2 Which forms an amphoteric oxide and a water soluble

Q. Which of the following is an amphoteric hydroxide?

1. $Sr(OH{)}_2$
2. $Ca(OH{)}_2$
3. $Mg(OH{)}_2$
4. $Be(OH{)}_2$

Q.

Which one of the following is an amphoteric oxide?

1. Al₂O₃

2. SO₂

3. CO₂

4. CaO

Q.

Give reasons:

(i) Conc. $HN{O}_3$ can be transported in aluminium container.

(ii) A mixture of dilute NaOH and aluminium pieces is used to open drain.

(iii) Graphite is used as lubricant.

(iv) Diamond is used as an abrasive.

(v) Aluminium alloys are used to make aircraft body.

(vi) Aluminium utensils should not be kept in water overnight.

(vii) Aluminium wire is used to make transmission cables.

Q. Which one of the following compounds is a peroxide?

1. $N{O}_2$
   
2. $K{O}_2$
   
3. $Ba{O}_2$
   
4. $Mn{O}_2$
   

Q.

Be and Mg do not react with water. This is because of?

Q. A metal $M$ readily forms water soluble sulphate $MS{O}_4$, water insoluble hydroxide $M(OH{)}_2$ and oxide $MO$ which becomes inert on heating. The hydroxide is soluble in $NaOH$. The $M$ is

1. $Be$
2. $Mg$
3. $Ca$
4. $Sr$

Q. Which of the following elements are inert to Oxygen?

1. Be
2. Mg
3. Ca
4. Sr

Q.

Magnesium burns in the presence of oxygen to from _______.

Q. Which one of the following alkaline earth metal are inert toward water?

1. Be
2. Mg
3. Ca
4. (a) and (b) above.

Q. Which of the followings are readily react with cold water?

1. Ba
2. Be
3. Mg
4. (a) and (b) above.

Q. Which one of the following alkaline earth metal are inert toward oxygen?

1. Be
2. Ba
3. Ca
4. Sr

Q.

An element is placed in 2nd Group and 3rd Period of the Periodic Table and burns in presence of oxygen to form a basic oxide. (e) Draw the electron dot structure for the formation of this oxide