Metallic Bond

Q. Which of the following metals have higher melting points?

1. Caesium
2. Gallium
3. Mercury
4. Gold

Q.

Why except certain Zn, Cd, Hg, Mn other metals have one or more typical metallic structure at normal temperature?

Q.

In ICl4, the shape is square planar. The number of bond pair-lone lone pair repulsion at 90^{o are :}

^{A) 6. B) 8. C) 12. D) 4}

Q. Which of the following statement is correct?

1. Down the group strength of metallic bonds increases nearly in all transition elements
2. Down the group strength of metallic bonds increases in alkali metals
3. Down the group strength of metallic bonds decreases in transition metals
4. None of the above

Q. Which of following physical properties can be explained by electron sea model?

1. Electrical conduction
2. Thermal conduction
3. Melleability
4. All of these

Q.

Which among the following can form the strongest metallic bond?

1. Sodium

2. Potassium

3. Magnesium

4. Aluminium

Q. The correct order of boiling point of $K,Ca,Sc$ is:

1. $K>Ca>Sc$
2. $Sc>Ca>K$
3. $K>Sc>Ca$
4. $Ca>K>Sc$

Q. What is forbidden zone ?

Q. Which of the following is observed in metallic bonds?

1. Mobile valence electrons
2. Localised electrons
3. Highly directed bond
4. None of these

Q.

Which of the following does not apply to metallic bond ?

1) Overlapping valence electrons

2) Mobile valence electrons

3) Delocalized electrons

4) Highly directed bonds

Q. Which of the following charecteristics of metals can not be explained by Electron sea model of metals?

1. Sonorousness
2. Hardness
3. Malleability
4. Electrical conductivity

Q. The metal-metal bond is strongest in case of

1. Cs
2. Li
3. Na
4. K

Q. Which of the following statement is incorrect regarding band theory?

1. For insulators, large energy gap is there between conduction band and valence band
2. None of these
3. For conductors, no energy gap is there between conduction band and valence band
4. For semiconductors, small energy gap is there between conduction band and valence band

Q. Which of the following statements is incorrect regarding metallic bonds?

1. Mobile valence electrons
2. It is stronger than covalent bonds.
3. Lack of bond directionality
4. none of the above

Q. The correct order of melting point will be:

1. $Be>Li$
2. $Be<Li$
3. $Be=Li$
4. Can not be predicted

Q. Which of the following is true for a metallic solid?

1. They are malleable and ductile.
2. They possess lusture
3. The do not conduct electricity in solid state, but conduct electricity in molten state.
4. Both (a) and (b)

Q.

Electronegativity from boron to aluminium decreases and then increases marginally due to discrepancy in atomic raddi of elements what does it mean ( meaning of discrepancy in this context) ?

Q. Carbon has the highest catenation character because

1. ‘C’ is more electronegative
2. C - C bond is strong
3. C has high ionization energy
4. C is a non - metal

Q. Assertion: Malleabilty of a metal is due to the presence of metallic bond
Reason: Metallic bond is non - directional

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. The force that binds a metal atom to a number of electrons within its sphere of influence is known as a metallic bond.
From the above mentioned statement which of these is false?

1. The valence electrons in a metallic bond are mobile.
2. Metallic bond is non-directional in nature.
3. Metallic bonds are weaker than covalent bonds.
4. Energy required to vaporise a mole of metal (say, copper) to the vapour state is larger than the energy required to vaporise a mole of a covalent substance (say, graphite)

Q. Which of the following is not poisonous?

1. $H_{2}O$
2. $H_{2}S$
3. $H_{2}Se$
4. $H_{2}Te$

Q.

In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of

Q. Which of the following metals have higher melting points?

1. Caesium
2. Gallium
3. Gold
4. Mercury

Q.

Which of the following alkali metals has the highest melting point?

1. $\mathrm{K}$

2. $\mathrm{Li}$

3. $\mathrm{Na}$

4. $\mathrm{Rb}$

Q.

Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements.

Q. Outline the principles of refining of metals by the following methods:
(i) Zone refining
(ii) Electrolytic refining
(iii) Vapour phase refining

Q.

Both zinc and mercury belong to the same group in which differentiating electron enters into d - sub shell of the penultimate shell. But zinc is a solid while mercury is a liquid. How do you justify this?

Q. Which of the following metals have higher melting points?

1. Caesium
2. Gallium
3. Gold
4. Mercury

Q. Which of the following statements are correct regarding band theory of metallic bond ?

1. Valence band is empty or half filled in metal
2. Conduction band is empty in metal
3. Energy gap between conduction and valence band is very less in non-conductors
4. Overlapping of conduction & valence band occurs in semiconductors

Q.

Which metal has the highest melting point

1. Copper

2. Silver

3. Aluminium

4. Tungsten