p-Block elementsHard
Question
Select incorrect statement :
Options
A.Interstitial carbides are formed by metalloids like Si and B
B.SiC is called carborundum
C.CO and CN- both are fatal due to complex formation with Fe(III) present in blood
D.CO is obtained as by-product when carbon and SiO2 is used in reduction processes of phosphate rock to give phosphorus.
Solution
(A) Interstitial carbides are formed by transition elements and lanthanides.
(B) SiC is a covalent carbide known by the name carborundum.
(C) CO is toxic, because it forms a complex with haemoglobin in the blood and this complex is more stable than oxy-haemoglobin. This prevents the haemoglobin in the red blood corpuscles from carrying oxygen round the body. This causes oxygen deficiency, leading to unconsciousness and then death.
Hb - O2 + CO → Hb - CO + O2
(D) 2Ca3(PO4)2 + 6SiO2 + 10C → P2 + 6CaSiO3 + 10CO.
(B) SiC is a covalent carbide known by the name carborundum.
(C) CO is toxic, because it forms a complex with haemoglobin in the blood and this complex is more stable than oxy-haemoglobin. This prevents the haemoglobin in the red blood corpuscles from carrying oxygen round the body. This causes oxygen deficiency, leading to unconsciousness and then death.
Hb - O2 + CO → Hb - CO + O2
(D) 2Ca3(PO4)2 + 6SiO2 + 10C → P2 + 6CaSiO3 + 10CO.
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