VSEPR Theory

Q. Which of the following defects in the crystals may lower the density?

1. Interstitial defect
2. Vacancy defect
3. Schottky defect
4. Frenkel defect

Q.

Why can sulfur bond 6 times?

Q. Find the number of nodal plane in Highest Occupied Molecular Orbital ($HOMO$) of $O_2$ molecule.

1. $0$
2. $2$
3. $3$
4. $1$

Q.

In which of the following chemical equations, do the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

1. $2{\mathrm{H}}_2\left(\mathrm{I}\right)+{\mathrm{O}}_2\left(\mathrm{I}\right)\to 2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)$

2. $2{\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{l}\right)\to 2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{I}\right)$

3. $2{\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{I}\right)$

4. $2{\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)$

Q. The type of defect $NaCl$ crystal can exhibit is:

1. Schottky defect
2. Interstitial defect
3. Frenkel defect
4. Impurity defect

Q.

Schottky defect in a crystal is observed when:

1. Some cations move from their lattice site to interstitial sites

2. Equal number of cations and anions are missing form the lattice

3. Some lattice sites are occupied by electrons

4. Some impurity is present in the lattice

Q.

In ${\mathrm{XeO}}_3{\mathrm{F}}_2$The Number Of Bond Pairs, Pi-bonds, And Lone Pairs On $\mathrm{Xe}$ Atoms Respectively Are?

1. $4,2,2$

2. $4,4,0$

3. $5,2,0$

4. $5,3,0$

Q. A list of species having the formula $X{Z}_4$ is given below: $Xe{F}_4,S{F}_4,Si{F}_4,B{F}_4^{-},Br{F}_4^{-},\left[Cu\right(N{H}_3{)}_4{]}^{2+},[FeC{l}_4{]}^{2-},[CoC{l}_4{]}^{2-}\text{and}[PtC{l}_4{]}^{2-}.$ Defining shape on the basis of the location of X and Z atoms, the total number of species having a square planar shape is

Q. What type of defect is shown in the given crystal lattice?

1. Frenkel defect
2. Schottky defect
3. Metal excess defect
4. Metal deficiency defect

Q. Which of the following is/are correct regarding defects in solids?

1. Stoichiometric defect is also called as intrinsic defect
2. Metal excess defect is a stoichiometric defect
3. Defects in crystal increase thermodynamic stability
4. All point defects results in the decrease in the density of the solid

Q. Which of the following solids will show the given crystal lattice defect?

1. $NaCl$
2. $AgBr$
3. $AgCl$
4. $KCl$

Q. Which of the following statements is true regarding defects in ionic solids?

1. Irregularity around a line is called line defects
2. F-centres are created in Frenkel defect
3. Heating $NaCl$ in sodium vapour atmosphere produces impurity defect
4. All of the above

Q. The corect order of increasing $C-O$ bond lengths in $CO,C{O}_3^{2-}$ and $C{O}_2$ is:

1. $C{O}_3^{2-}<C{O}_2<CO$
2. $CO<C{O}_3^{2-}<C{O}_2$
3. $C{O}_2<C{O}_3^{2-}<CO$
4. $CO<C{O}_3^{2-}<C{O}_2$

Q.

What is the bond angle of the molecule undergoing ${\mathrm{sp}}^2$hybridization?

Q. Which of the following is correct regarding defects in solids?

1. Stoichiometric defect is also called as intrinsic defect
2. Metal excess defect is a stoichiometric defect
3. Defects in crystal decrease thermodynamic stability
4. All point defects results in the decrease in the density of the solid

Q. In Schottky defect, the density:

1. Remains same
2. Decreases
3. Increases
4. Decreases first then increases

Q. The correct statement(s) regarding F-centre is/are?

1. Electron are held in the voids of crystals
2. F-centre produces colour to the crystals
3. Conductivity of the crystal increases due to F-centre
4. None of the above

Q.

What are the differences between the shape and structure of${\mathrm{XeF}}_4$?

Q.

The plots of radial distribution functions for various orbitals of hydrogen atoms against $r$ are given below:

The correct plot for $3\mathrm{s}$ orbital is

1. 

2. 

3. 

4. 

Q.

Below are two statements:

Statement I: Frenkel defect provides colour in a solid.

Statement II: Frenkel defect is an interstitial defect.

1. Statement I is correct, and statement II is correct.

2. Statement I is correct, and statement II is incorrect.

3. Statement I is incorrect, and statement II is incorrect.

4. Statement I is incorrect, and statement II is correct

Q. Which of the following defects has the presence of cations in the interstitial sites?

1. Frenkel defect
2. Metal deficiency defect
3. Schottky defect
4. Vacancy defect

Q.

The number of isomers in ${\mathrm{C}}_4{\mathrm{H}}_{10}\mathrm{O}$ are______.

Q. The correct statement regarding defects in solid is:

1. Schottky defect occurs when large difference in the sizes of cations and anions
2. Frenkel defect is also know as dislocation defect
3. F-centres are formed by cation vacancy of metal excess defect
4. Schottky defect have no effect on the physical properties of solids

Q. what do unders†an d by imperfection ionic crystals name the types of imperfection in ionic crystals

Q. Which of the following statement(s) is/are true regarding defects in ionic solids?

1. Irregularity around a line is called line defects
2. F-centres are created in Frenkel defect
3. Adding $SrC{l}_2$ to molten $NaCl$ produces impurity defect
4. Heating $NaCl$ in sodium vapour atmosphere produces impurity defect.

Q. Number of ${90}^{\circ }$ $F-Br-F$ bond angles in $Br{F}_5$ is:

1. 6
2. 0
3. 8
4. 4

Q. What is the defect exhibted by the ionic crystal when the difference in the size of cations and anions is large?

1. Defectless crystal
2. Schottky defect
3. Both Schottky and Frenkel defects
4. Frenkel defect

Q. In Schottky defect

1. An ion moves to interstial position between the lattice points
2. Electrons are trapped in a lattice site
3. Crystal remains electrically neutral
4. Some extra cations are present in interstitial space

Q. Ionic solids, with Schottky defects, contain in their structure:

1. Cation vacancies only
2. Cation vacancies and interstitial cations
3. Equal number of cation and anion vacancies
4. Anion vacancies and interstitial anions

Q.

The hybridization of xenon in ${\mathrm{XeOF}}_4$is:

1. ${\mathrm{sp}}^3$

2. ${\mathrm{sp}}^3\mathrm{d}$

3. ${\mathrm{sp}}^3{\mathrm{d}}^2$

4. ${\mathrm{sp}}^3{\mathrm{d}}^3$