Acidic Character, Basic Character and Nature of Oxides

Q.

Which of the following oxides is amphoteric in character

1. CaO

2. CO₂

3. SiO₂

4. SnO₂

Q.

Which one of the following oxides is neutral

1. CO

2. SnO₂

3. ZnO

4. SiO₂

Q. An element X occurs in short period having configuration $n{s}^{2}n{p}^1$. The formula and nature of its oxide is

1. XO₃, basic

2. XO₃, acidic

3. X₂O₃, amphoteric

4. X₂O_3, basic

Q.

The pair of amphoteric hydroxides is

1. 

2. 

3. 

4. 

Q.

Which is most acidic oxide ?

1. Cl2O

2. ClO2

3. Cl2O6

4. Cl2O7

Q. A molten ionic hydride on electrolysis gives-

1. $H^{+}$ ions moving toward the cathode
2. $H^{+}$ ion moving towards the anode
3. $H_2$ is liberated at anode
4. $H_2$ is liberated at cathode

Q. Most basic oxide out of following is:

1. $N{a}_{2}O$
2. $CaO$
3. $MgO$
4. $FeO$

Q.

Acidity of pentoxides in VA group

1. Increases

2. Decreases

3. None

4. Remains same

Q. With an increase in the extent of penetration of valence electrons, ionization energy

1. Both are not related
2. Increases
3. Remains Constant
4. Decreases

Q.

The correct order of increasing order of oxidising power is

1. 

2. 

3. 

4. 

Q. The acid ionization constant of Zn^(2+) is 2.0 x 10^(-10). What is the basic dissociationconstant of Zn(OH)^(+1)? (a) 5 x 10^(-5) (b) 2.0×10^(4) (c) 2 x 10^(-10) (d) 5 x 10^(9)

Q. Consider the following reaction between zinc and oxygen and choose the correct option out of the options given below:

$2Zn\left(s\right)+O_2\left(g\right)\to 2ZnO\left(s\right);△H=-693.8kjmo{l}^{-1}$

1. $693.8kjmo{l}^{-1}$ energy is evolved in the reaction
2. The enthalpy of two moles of ZnO is less than the total enthalpy of two moles of Zn and one mole of oxygen by $693.8kj.$
3. The enthalpy of two mole of ZnO is more than the total enthalpy of two moles of Zn and one mole of oxygen by $693.8kj.$
4. $693.8kjmo{l}^{-1}$ energy is absorbed in the reaction

Q. Explain why can alkali and alkaline earth metals not be obtained by chemical reduction methods?

Q. The most acidic oxide among the following is:

1. $MgO$
2. $S{O}_3$
3. $N{O}_2$
4. $C{l}_2{O}_7$

Q. Which of the following is the most basic oxide?

1. $N_{2}O$
2. $MgO$
3. $N{a}_{2}O$
4. $FeO$

Q. Arrange the following hydrides in their increasing acid strength $[C{H}_4,H_{2}S,P{H}_{3}andSi{H}_4]$ -

1. H2S < PH3 < SiH4 < CH4

2. CH4 < SiH4 < PH3 < H2S

3. SiH4 < CH4 < PH3 < H2S

4. CH4 < H2S < PH3 < SiH4

Q.

Identify the least stable ion among the following

1. 

2. 

3. 

4. 

Q.

The order of the increasing basicity of the compounds is as follows.

1. B₂O₃> Al₂O₃> Ga₂O₃> In₂O₃

2. Ba₂O₃> Ga₂O₃> Al₂O₃> In₂O₃

3. Ba₂O₃< Ga₂O₃< Al₂O₃< In₂O₃

4. Ba₂O₃< Al₂O₃< Ga₂O₃< In₂O₃

Q. Most basic oxide out of following is:

1. $N{a}_{2}O$
2. $CaO$
3. $MgO$
4. $FeO$

Q. Which of the following is the incorrect reason for anomalous behaviour of Lithium?

1. High polarising power of its ion
2. Exceptionally small size of its atom
3. Exceptionally low ionisation enthalpy
4. High degree of hydration of its ion

Q. Which of the following options has only amphoteric oxides?

1. $Sn{O}_2,PbO,B_2{O}_3$
2. $C{r}_2{O}_3,BeO,Sn{O}_2$
3. $Pb{O}_2,ZnO,NO$
4. $A{l}_2{O}_3,CrO,PbO$

Q. Arrange the following oxides in the decreasing orders of their basic strength.
$I.T{l}_{2}O$ $II.A{l}_2{O}_3$ $III.T{l}_2{O}_3$ $IV.G{a}_2{O}_3$

1. $I>III>IV>II$
2. $II>IV>III>I$
3. $III>I>II>IV$
4. $IV>II>I>III$

Q. The pair of amphoteric hydroxides is:

1. $Al{\left(OH\right)}_3,LiOH$
2. $Be{\left(OH\right)}_3,Mg{\left(OH\right)}_2$
3. $B{\left(OH\right)}_3,Be{\left(OH\right)}_2$
4. $Be{\left(OH\right)}_2,Zn{\left(OH\right)}_2$