Allotropes of Phosphorus

Q. Most reactive form of phosphorus is

1. Red phosphorus
2. Black phosphorus
3. All allotropes are equally reactive
4. White phosphorus

Q. $\beta -$phosphorus is conductor of electricity but white phophorus, red phosphorus and $\alpha -$phophorus are not.

1. True
2. False

Q. Red phosphorus reacts with caustic alkalies.

1. True
2. False

Q.

$P_4$ (white phosphorus) when treated with thionyl chloride produces phosphorus ___. On the other hand if $P_4$ (white phosphorus) is treated with sulphuryl chloride we get phosphorus ___.

Q. Given below are four statements regarding the allotropes of Phosphorus. Which of them is/are incorrect?

1. White Phosphorus is a waxy, molecular solid that has a garlic-like odour
2. Red Phosphorus is more reactive than white phosphorus and it is soluble in carbon disulphide
3. Red Phosphorus can be cut with a knife
4. Red Phosphorus is a non-toxic, odourless polymeric solid at room temperature

Q. Of the given 3 allotropes of Phosphorus – white, red and black, which is the most stable thermodynamically?

1. Both a and c
2. Black Phosphorus
3. White Phosphorus
4. Red Phosphorus

Q. Pure white phosphorus is obtained by heating phosphate rocks with Silica and Coke in an electric furnace - True or False?

1. True
2. False

Q. The P-P-P bond angle in the tetra-atomic $P_4$ molecule is 107 degrees - True or False?

1. True
2. False

Q. White phosphorus is a highly-reactive, molecular solid that melts just above room temperature (melting point = 30 degree Celsius). It subtly glows in the dark emitting light and this phenomenon is called chemiluminescence – True or False

1. True
2. False

Q. Of the two allotropes – white and red phosphorus, __ Phosphorus does not react with alkali solution.