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The p-Block Elements (Group 13 and 14)
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Taking stability as the factor, which one of the following represents correct relationship?A $TlI>TlI_3$B $TlCl_3>TlCl$C $InI_3>InI$D $AlCl>AlCl_3$
Thallium is more stable in the +1 state because of the inert pair effect.
$Tl^{+3}$ is less stable than $Tl^{+1}$ (inert pair effect). Going down group 13, stability of lower oxidation state increases. In case of B, Al, Ga and In, higher O.S. +3 remains more stable than lower O.S. +1. But in the last element, thallium (Tl), lower O.S. +1 becomes more stable than higher O.S. +3. -
Match List-I with List-II
Column I
- A. Coke
- B. Diamond
- C. Fullerene
- D. Graphite
Column II
- I. Carbon atoms are $sp^3$ hybridised.
- II. Used as a dry lubricant
- III. Used as a reducing agent
- IV. Cage like molecules
Correct answer: A → III, B → I, C → IV, D → II
Coke is a reducing agent, diamond is sp3, fullerene is cage-like, graphite is a lubricant.
Coke – reducing agent Diamond – $sp^3$ carbons Fullerenes – cage like structure Graphite – used as lubricant -
Amongst the given options, which of the following molecules/ion acts as a Lewis acid?A $OH^-$B $NH_3$C $H_2O$D $BF_3$
BF3 has an incomplete octet on boron, so it accepts a lone pair.
$BF_3$ behaves as Lewis acid due to incomplete octet in valence shell of Boron. Hence it can accept a lone pair of electrons. -
Choose the correct statement.A Both diamond and graphite are used as dry lubricants.B Diamond and graphite have two dimensional networkC Diamond is covalent and graphite is ionicD Diamond is $sp^3$ hybridised and graphite is $sp^2$ hybridized.
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Which of the following statement is not correct about diborane?A Both the Boron atoms are $sp^2$ hybridised.B There are two 3-centre-2-electron bonds.C The four terminal B-H bonds are two centre two electron bondsD The four terminal Hydrogen atoms and the two Boron atoms lie in one plane
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Identify the correct statements from the following: (a) $CO_2(g)$ is used as refrigerant for ice-cream and frozen food. (b) The structure of $C_{60}$ contains twelve six carbon rings and twenty five carbon rings. (c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline. (d) CO is colorless and odourless gas.A (a) and (c) onlyB (b) and (c) onlyC (c) and (d) onlyD (a), (b) and (c) only
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Which of the following is not correct about carbon monoxide?A It reduces oxygen carrying ability of blood.B The carboxyhaemoglobin (haemoglobin bound to CO) is less stable than oxyhaemoglobin.C It is produced due to incomplete combustion.D It forms carboxyhaemoglobin.
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Which of the following species is not stable?A $[SiF_6]^{2-}$B $[GeCl_6]^{2-}$C $[Sn(OH)_6]^{2-}$D $[SiCl_6]^{2-}$
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Which of the following is incorrect statement?A $PbF_4$ is covalent in natureB $SiCl_4$ is easily hydrolysedC $GeX_4$ (X = F, Cl, Br, I) is more stable than $GeX_2$D $SnF_4$ is ionic in nature