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NEET Chemistry MCQ
Carbon Family Mcq Neet Chemistry
Quiz 5
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Q.1
The oxidation number of C in CH2O is
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a) -1
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b) +2
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c) zero
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d) -4
Explanation
Answer: (c)
Q.2
Chrome yellow is
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a) PbCrO4
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b) Cr2O72-
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c) PbCl2
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d) PbCO3
Explanation
Answer:(a)
Q.3
What happened when SiO4 4- is heated
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a) Si2O76-
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b) Changes to Si4O116-
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c) Changes to SiO2
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d) Nothing will happen
Explanation
Answer: (a)
Q.4
Reaction of tin with excess nitric acid gives
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a) stanic nitrate
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b) stanus nitrate
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c) three wont be any reaction
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d) metastannic acid
Explanation
Sn + 4HNO3→ SnO2 + 4NO2 + 2H2O SnO2 is also known as metastannic acid Answer: (d)
Q.5
The compound form when stannic chloride is treated with Con HCl is ..
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a) SnCl2
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b) (SnCl6)2-
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c) (SnCl4)2-
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d) Reaction wont take place
Explanation
In SnCl2, Sn has vacant d-orbitals which can accommodate two pairs of electrons from two Cl- ions from HCl and thus forms (SnCl6)2- Answer: (b)
Q.6
Carbon can act as an abrasive and also as lubricant because...
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a) It can form three dimensional tetra hedral covalent bond
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b) It have sheet like structure
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c) It can form Sp3 and Sp2 hybridization
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d) because of option (a) and (b)
Explanation
Because of three dimensional tetrahedral covalent bond like diamond carbon is very hard and because sheet like structure in graphite it is shoft Answer:(d)
Q.7
Which of the following compound of lead is explosive ..
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a) PbSO4
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b) PbCl2
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c) CH3COOPb
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d) Pb((N3)2
Explanation
Answer: (d)
Q.8
Carbon suboxide C3O2 has ... [ DCE 2003]
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a) Distorted tetrahedral structure
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b) Trigonal planar structure
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c) Bent structure
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d) Linear structure
Explanation
In carbon suboxide all the carbon atoms are sp-hybridized ∴C3O2 has linear structure Answer: (d)
Q.9
The general trained trend in the properties of elements of carbon family shows that with increases in atomic number?
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a) The tendency towards catenation increases
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b) The metallic character decreases
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c) Stability of +2 oxidation state increases
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d) tendency to form complex compound decreases
Explanation
Answer: (c)
Q.10
Which of the following statement is not true?
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a) Lead is a true metal with +2 electrovalency
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b) Lead reacts with HCl to form PbCl2
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c) PbCl4 is powerful reducing agent
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d) Lead dissolves in water to produce Pb(OH)2 in presence of O2
Explanation
PbCl4 is powerful oxidizing agent Answer:(c)
Q.11
The silicate which do not contain discrete anions are
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a) Ortho silicate
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b) Sheet silicate
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c) Pyro silicate
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d) Cyclic silicate
Explanation
Sheet silica contains extended anions Answer: (b)
Q.12
Graphite is good conductor of electricity because..
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a) C in graphite is sp3 hybridized
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b) it has free electrons
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c) It is crystalline
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d) it has free atoms
Explanation
Graphite is a good conductor of electricity. Its structure is the main reason for this property. Each carbon atom in graphite is directly linked to only three carbon atoms through covalent bonds. Therefore, out of the four valence electrons in a carbon atom, only three are used for bonding and the fourth is relatively free and can move from one carbon atom to the other. These free electrons make graphite a good conductor of electricity. Answer: (b)
Q.13
Which of the following statement is not true?
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a) SnCl4 is oxidizing in nature
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b) SnCl2 is ionic solid
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c) PbCl2 is ionic solid
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d) SnCl4 is reducing in nature
Explanation
Answer: (d)
Q.14
In which colour can PbO exists
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a) Yellow
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b) Orange
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c) Red
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d) All of the above
Explanation
Answer:(d)
Q.15
What is the difference between two successive oxidation state of d block elements
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a) Two units
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b) One unit
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c) Three unit
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d) Different oxidation sates do not exists
Explanation
Answer: (b)
Q.16
The bond dissociation energy of B - F in BF3 is 646 kJ mol-1 whereas that of C - F in CF4 is 515 kJmol-The correct reason for higher B - F bond disassociation energy as compared to that of C - F is ... [ AIEEE 2009]
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a) smaller size of B atom as compared o that of C -atom
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b) Stronger 's' bond between B and F in BF3 as compared to that between C and F in CF4
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c) Significant pπ - pπ interaction between B and F in BF3, whereas there is no possibility of such interaction between C and F in CF
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d) Lower degree of pπ - pπ interaction between B and F in BF3 than between C and F in CF4
Explanation
B in BF3 is sp2 hybridized thus there is pπ - pπ interaction C in CF4 is sp3 hybridized three is only σ bonding Answer: (c)
Q.17
he tetrahalided of group 14 elements except that carbon act as
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a) Strong lewis bases
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b) Strong Lewis acid
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c) Strong reducing agent
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d) Strong oxidizing agent
Explanation
Except carbon all have d orbitals, can accept electrons thus acts as lewis acid Answer: (b)
Q.18
Which of the following is not a compound
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a) White lead
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b) Black lead
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c) Red lead
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d) non of the above
Explanation
Black lead is element Pb not compound Answer:(b)
Q.19
Glass is a homogeneous mixture of
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a) Boron and silicon carbides
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b) Carbonates of alkali and alkaline earth metals
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c) Oxides of alkali and alkaline earth metals
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d) Different silicates and borates
Explanation
Answer: (d)
Q.20
Which is called whitegraphite
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a) SiO2
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b) BN
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c) B2O3
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d) SiC
Explanation
Answer: (b)
Q.21
Which of the following is the reaction for Plumosolvency
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a) 2Pb + O2 → 2PbO
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b) Pb +6 2HCl → PbCl2 + H2
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c) 2Pb + O2 + 2H2O → 2Pb(OH)2
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d) Pb + 2H2O → Pb(OH)2 + H2
Explanation
Answer: (c)
Q.22
hen alkali is added to an aqueous solution of a tin (II) salt, stannous hydroxide gets precipitate. On addition of more alkali, the precipitate dissolves due to the formation of
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a) SnO2. nH2O
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b) SnO22-
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c) SnO32-
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d) Sn(OH)2
Explanation
SnCl2 + 2NaOH → Sn(OH)2 + 2NaCl Sn(OH)2 + NaOH → Na2SnO2 + 2H2O Sodium stannite ( Na2SnO2) is soluble in water Answer:(b)
Q.23
An hydrous Satannic chloride can be prepared by
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a) Heating stannous chloride dihydrate
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b) Passing Cl2 over fused tin
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c) Heating tin in current of HCl gas
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d) Reacting SnO2 with HCl gas
Explanation
Answer: (c)
Q.24
A yellow solid, known to be a single compound is completely insoluble in hot water but dissolves in hot dilute HCl to give orange red solution. When this solution is cooled a white crystalline precipitate is formed. then compound is
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a) Chromium silicate
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b) copper oxide
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c) lead chromate
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d) ferric oxide
Explanation
When HCl is added to lead chromate it turns white, and a yellow solution is leached off. Answer: (c)
Q.25
The glass with smallest coefficient of expansion is ..
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a) Soft glass
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b) Flint glass
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c) Borosil glass
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d) Jena glass
Explanation
Answer: (c)
Q.26
Lead is most readily dissolves in
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a) HCl
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b) H2SO4
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c) HNO3
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d) Acetic acid
Explanation
Pb reacts readily with Acetic acid in presence of Oxygen to give lead acetate Answer:(d)
Q.27
Water transported through lead pipes becomes poisonous due to the formation of
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a) PbO
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b) PbO2
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c) Pb(OH)2
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d) Pb3O4
Explanation
Answer: (b)
Q.28
The order of decreasing ionic character of lead dihalides is
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a) PbF2 > PbCl2 > PbBr2 > PbI2
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b)PbI2 > PbBr2 >PbCl2 > PbF2
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c) PbF2 > PbCl2 >PbI2 > PbBr2
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d) PbI2 >PbCl2 > PbBr2 > PbF2
Explanation
In halides down the group electroneagtivity decreases thus difference between electro negativity of Pb and halid decreases , resulting in lesser ionic character Answer: (a)
Q.29
What is the colour of PbI2
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a) orange
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b) Yellow
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c) Red
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d) Blue
Explanation
Answer: (b)
Q.30
Lead pipe can be used safely for carrying
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a) soft water
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b) soft water first treated with lime stone
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c) Conc HNO3
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d) Soft as well as hard water
Explanation
Soft water first treated with lime stone (CaCO3) contains some CO32- ions in it which can form a coating of insoluble lead carbonate on the surface of lead pipe and protect from water becoming poison Answer:(b)
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