Allotropes of Sulphur

Q.

Define allotropy. Give examples of elements that exhibit allotropy.

Q. A copper complex crystallising in a CCP lattice with a cell edge of $0.4518nm$ has been revealed by employing X-ray diffraction studies. The density of a copper complex is found to be $7.62gc{m}^{-3}.$
The molar mass of copper complex is __________
$gmo{l}^{-1}.$ (Nearest integer) [Given : $N_A=6.022\times {10}^{23}mo{l}^{-1}]$

Q. How many $P-H$ bonds does hypophosphorous acid contain?

Q. Which is the most stable allotrope of sulphur?

1. Octahedral sulphur
2. Monoclinic sulphur
3. Plastic sulphur
4. Colloidal sulphur

Q.

Nitration of anisole gives majorly:

1. meta-Nitroanisole

2. Nitroanisole

3. para-Nitroanisole

4. ortho-Nitroanisole

Q.

What is the oxidation state exhibited by Boron?

Q.

The allotrope of sulphur that is more stable at room temperature is:

1. Monoclinic sulphur

2. Rhombic sulphur

3. Beta sulphur

4. None of these

Q.

The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniform. White metallic tin buttons got converted to grey powder. This transformation is related to:

1. an interaction with N₂ of air at low temperature

2. a change in the partial pressure of O₂ in air

3. an interaction with water vapour contained in humid air

4. a change in crystalline structure of tin

Q.

Existence of an element in more than one form in the same physical state is called _________.

Q. The stable allotropic form of sulphur at room temperature is:

1. Rhombic sulphur
2. Monoclinic sulphur
3. Plastic sulphur
4. $\beta -$ sulphur

Q. Which of the following are correct axial distance and axial angles for a orthorhombic system?

1. $a=b=c,\alpha =\beta =\gamma ={90}^o$
2. $a=b\ne c,\alpha =\beta =\gamma ={90}^o$
3. $a\ne b\ne c,\alpha =\beta =\gamma ={90}^o$
4. $a=b\ne c,\alpha =\beta ={90}^o,\gamma ={120}^o$

Q.

Which of the following is not a chemical method for preparation of colloids?

1. Reduction

2. Electrical disintegration

3. Hydrolysis

4. Oxidation

Q.

Charcoal is ______ (a crystalline/an amorphous) form of carbon.

Q. Lassaigne’s test is used for the detection of which of the following element(s):

1. Nitrogen
2. Sulphur
3. Chlorine
4. Oxygen

Q. Thermocol is produced from which material?

Q.

-------------- is an amorphous form of Sulphur(S).

Q. Which of the following Chalcogens shows the highest tendency for catenation?

1. Tellurium
2. Sulphur
3. Oxygen
4. Polonium

Q.

Define allotropy.

Q. Which of the following atoms has been assigned only single oxidation number?

1. H
2. N
3. F
4. O

Q. In a rock salt structure $NaCl$ :

1. $N{a}^{+}$ ions form a ccp aarangment
2. All the octahedral voids are vacant.
3. $C{l}^{-}$ ions form a ccp aarangment
4. All the tetrahedral voids are filled

Q. $FeS{O}_4\bullet 7H_{2}O$ (Green vitriol) represents which type of crystal system?

1. Hexagonal
2. Tetragonal
3. Monoclinic
4. Cubic

Q. Rhombic sulphur is the most stable allotropic form of sulphur.

1. True
2. False

Q. What is allotropy? Name allotrops forms of sulphur.

Q. From the two allotropes of sulphur, Rhombic sulphur and Monoclinic sulphur, which is more stable?

1. Rhombic
2. Monoclinic
3. Both are equally stable
4. None

Q.

The allotropic forms are physically………but chemically …………….

Q. $S_8$ is an allotropic form of sulphur which has a crown structure.

1. True
2. False

Q.

Answer the following question.

Define the term allotropy.

Q. The most stable allotropic form of sulphur is :

1. rhombic
2. monoclinic
3. colloidal
4. plastic

Q.

Which element has the highest number of allotropes?

1. Carbon

2. Selenium

3. Sulphur

4. Phosphorus

Q. Account for the following:
(i) Helium is used in diving apparatus.
(ii) Flourine does not exhibit positive oxidation state.
(iii) Oxygen shows catenation behaviour less than sulphur.