Chm 205 inorganic chemistry li tma1
Question 1 ______is a compound of coal and petroleum?
Answer is carbon
Question 2 the ability of the molecule of graphite held together to slide past one another impart in it_____?
Answer is lustre
Question 3____ is used for making crucible as a lubricant in heavy machine and as pencil lead?
Answer is graphite
Question 4 which of the following statement is correct?
Answer is hydrolysis of silicon tetrachloride give silicic acid
Question 5 commercial form of silicon can be obtained by_______?
Answer is reductions of silicon dioxide with calcium II carbide in an electric furnace
Question 6 diamond behave as an insulator because of_____?
answer is strong covalent bond formed within its molecule restricting mobility of election.
Question 7 although diamond occur in nature but it can be obtained artificially by_______?
Answer is subjecting cabin to high temperature and pressure
Question 8____ is used to strengthen rubber as a pigment, in ink, paint, paper and plastic?
Answer is carbon black
Question 9 diamond is one of the hardest substance known due to the present of _____in the structure?
Answer is 3-dimensional linkage
Question 10 diamond is not a conductor of electricity because of_____?
Answer is it does not have delocalised electron
Question 11_____ occur the elemental state as diamond and graphite?
Question 12 among the group 4 element moving from carbon to silicon the covalent radius increase sharply afterward the increase is gradually this is attributed to______?
Answer is as you move down the group up to silicon effective nuclear charge out balance the effect of additional shell leading to a sharp increase and afterward gradually increase in size.
Question 13 which of the following option is used in glass and cement manufacture?
Answer is silicate
Question 14_____ is formed when petroleum gas or natural gas is burnt in a limited supply of air?
The answer is carbon black
Western 15 group 4 elements form mostly covalent compounds because of_______?
Answer is generations energy required to form the m4 + is low
Question 16 the element of group 4 sho oxidation state of?
Answer is + 2 and + 4
western 17 germanium is obtained by________?
Answer is reduction of germanium dioxide with carbon or hydrogen
Question 18 tin is obtained by_________?
Answer is reduction of oxide of tin with carbon
Question 19 the different layers or molecules of graphite are held together by_____?
Answer is van der waal force
Question 20 diamond and silicon carbide have the same structure but they are differ in that_______?
Answer is in diamond each carbon is tetrahedral bonded to four other carbon why in silicon carbide silicon is tetrahedral bonded to four other carbon