Boron and silicon combine with carbon to form ___________.
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_________ are formed by elements of 1,2, 3,11,12 and13 except boron.
A. Ionic carbides
B. Interstitial carbides
C. Covalent carbides
D. Organic carbides
Answer: A
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The element with the highest electron affinity amongst the halogens is ___________.
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The tendency of gaining an electron to acquire a stable noble gas configuration makes the halogens ________.
A. Have low electron affinity
B. High electron affinity
C. Low ionization energy
D. susceptible to oxidation
Answer: B
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The reactivity of the various allotropes of phosphorus towards other substances decreases in the order?
A. brown-white-red-black
B. Black-red-white-brown
C. White-black-brown-red
D. Red-brown-black-white
Answer: A
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Which of the options below indicates how carbon behaves differently from other members of Group 4?
A. Carbon forms complex compounds while the other members do not
B. Carbon forms solid oxides while the other members do not
C. Carbon has a maximum covalency of 6 while other members have 4
D. Carbon has a much higher electronegativity and higher ionisation energy than other elements in the group
Answer: D
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Tin exhibit polymorphism because of _____________ .
A. It exists in two crystalline forms
B. It can function as a conductor and semi-conductor
C. It is a metal as well as a metalloid
D. It has a stable configuration
Answer: A
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________ occurs in the elemental state as diamond and graphite.
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Tin is obtained by the ______.
A. Reduction of oxides of tin with carbon
B. Oxidation of oxides of tin with carbon
C. Reduction of oxides of tin with H
D. Oxidation of oxides of tin with Fe
Answer: A
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Ammonifying bacteria present in the soil decompose plants and animals when they die into ________
A. Nitrogenous and hydrides
B. Nitrogen and oxides
C. Nitrogen and ammonium compounds
D. Ammonium and hydrides
Answer: C
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