CHM205: Inorganic Chemistry Ii TMA3

Question 1 : The difference between silica and silicate is ________.
A. Silica is made of SiO2 units whereas silicate is made of SiO4 units
B. Silica is made of SiO4 units whereas silicate is made of SiO2 units
C. Silica is made of SiO6 units whereas silicate is made of SiO2 units
D. Silica is made of SiO4 units whereas silicate is made of SiO6 units

Answer to question 1 is A. Silica is made of SiO2 units whereas silicate is made of SiO4 units

Question 2 : In the gaseous state phosphorus exist as _________,
A. P2
B. P4
C. P
D. P6

Answer to question 2 is B. P4

Question 3 : Lightning discharge in the atmosphere converts nitrogen to _________.
A. Nitric oxide
B. Nitrate
C. Ammonia
D. Nitrite

Answer to question 3 is B. Nitrate

Question 4 : The tendency of ________ to form multiple bonds easily is due to its high bond energy and small atomic radius.
A. Silicon
B. Germanium
C. Carbon
D. Lead

Answer to question 4 is C. Carbon

Question 5 : Which one of the following compounds is formed when carbides are decomposed by water or dilute acids?
A. Acetylene
B. Propanal
C. Methanol
D. Ethylene

Answer to question 5 is C. Methanol

Question 6 : Superphosphate of lime is a more effective fertilizer than phosphate rock because of _________.
A. Ca(H2PO4)2 is reducing
B. Ca(H2PO4)2 is highly reactive
C. Ca(H2PO4)2 is water soluble
D. Ca(H2PO4)2 is oxidising

Answer to question 6 is C. Ca(H2PO4)2 is water soluble

Question 7 : Hydrazine can act as a coordinating ligand forming complexes with metal ions because of _________.
A. It has lone pairs of electrons
B. Hydrazine is highly reactive
C. Hydrazine is stable
D. The bond energy of N-N bond in hydrazine is very small

Answer to question 7 is D. The bond energy of N-N bond in hydrazine is very small

Question 8 : Silica gel is _____________ form of Silicon dioxide.
A. Semi solid
B. Crystalline
C. Gaseous
D. Amorphous

Answer to question 8 is B. Crystalline

Question 9 : All the elements of Group 5 can expand their octet except _____________.
A. Phosphorus
B. Nitrogen
C. Arsenic
D. Bismuth

Answer to question 9 is B. Nitrogen

Question 10 : The compound among the options below with the least bond energy is ___________.
A. NH3
B. SbH3
C. PH3
D. BiH3

Answer to question 10 is D. BiH3

Question 11 : The purest and most stable form of silica is ____________
A. Tridymite
B. Cristobalite
C. Flint
D. Quartz

Answer to question 11 is D. Quartz

Question 12 : ____________ are formed by combination of carbon with some transition metals.
A. Coordination compounds
B. Alloys
C. Polymers
D. Interstitial carbides

Answer to question 12 is D. Interstitial carbides

Question 13 : Other halogens apart from fluorine exhibit variable oxidation states due to ________.
A. Other halogens have vacant d orbital whereas fluorine doesn’t
B. None of the above
C. Other halogens have vacant p orbital whereas fluorine doesn’t
D. All of the above

Answer to question 13 is A. Other halogens have vacant d orbital whereas fluorine doesn’t
Question 14 : Which of the options below shows how carbon behaves differently from the rest of the elements in its group?
A. Carbon has a much lesser electronegativity than other elements in the group
B. Carbon form both gaseous and solid oxides whereas others form only gaseous oxides
C. Carbon has a maximum covalency of 4 and can therefore form complex compounds
D. Carbon is the only element in the group that can form stable derivatives with double and triple bonds

Answer to question 14 is D. Carbon is the only element in the group that can form stable derivatives with double and triple bonds

Question 15 : Carbon dioxide is used in fire extinguishers because of ________.
A. It can be transformed to solid called dry ice
B. It is an acidic oxide
C. It forms carbonates with bases
D. It does not support combustion

Answer to question 15 is D. It does not support combustion

Question 16 : The chief constituent of glass is ____________.
A. Silicates
B. Silica
C. Silicone
D. Silicon bydrides

Answer to question 16 is B. Silica

Question 17 : The most stable hydride of phosphurous is _________.
A. Phosphide
B. Phosphorus pentahydride
C. Phosphine
D. Phosphorus dihydride

Answer to question 17 is C. Phosphine

Question 18 : The principal constituents of all rocks, clays and soils are ______.
A. Nitrates
B. Nitrates
C. Silicates
D. Phosphorus

Answer to question 18 is C. Silicates

Question 19 : The tetrahedron of the trihydrides of Group 5 elements is distorted due to repulsion between the lone pair of electrons and the bonded pairs giving these hydrides __________ structure.
A. Octahedral
B. Pyramidal
C. Trigonal
D. Linear

Answer to question 19 is B. Pyramidal

Question 20 : Sandstone, granite and slate are examples of ________.
A. Silica
B. Carbides
C. Natural silicates
D. Cristobalite

Answer to question 20 is C. Natural silicates