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NEET Chemistry MCQ
Carbon Family Mcq Neet Chemistry
Quiz 4
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Q.1
Which of the following conceivable structures for CCL4 will have a zero dipole moment?
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a) Square planar
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b) Square pyramid ( Carbon at apex
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c) Irregular tetrahedron
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d) Regular tetrahedron
Explanation
In CCL4 C is sp3 thus have regular tetra hedron shape and net moment is zero because of symmetric distribution of Cl Answer: (d)
Q.2
The soliders of Nepolean army while at Alps during freezing winter suffered a series problem as regards of the tin buttons of their uniforms. White metallic tin buttons got converted to gray powder. This transformation is related to .. [ AIEEE2004]
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a) An interaction with nitrogen of the air at very low temperature
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b) A change in crystalline structure of tin
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c) A change in the partial pressure of oxygen in air
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d) An interaction with water vapour contained in humid air
Explanation
At low temperature tin converted to gary tin which is very brittle and easily crumbles to powder Answer: (b)
Q.3
[SiO4]4- has tetrahedral structure, the silicate formed by using the three oxygen has
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a) Two dimension; sheet structure
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b) Pyrosilicate structure
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c) Linear polymer structure
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d) Three dimensional structure
Explanation
Answer: (a)
Q.4
Which does not exists
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a) Si2O76-
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b) [CCl6]2-
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c) [SiCl6]2-
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d) [GeCl6]2-
Explanation
Due to non availability of d orbital C can not expand its oxidation state Answer:(b)
Q.5
The oxide which can not act as reducing agent is ...
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a) SO2
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b) NO2
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c) CO2
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d) PCl3
Explanation
Carbon in CO2 can not have oxidation sate more than +4 Answer: (c)
Q.6
In silicon dioxied [ AIEEE 2005]
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a) Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bounded to two silicon atoms
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b) Each silicon atom is surrounded by two Oxygen atom and each oxygen atom is bonded to two silicon atoms
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c) Silicon is bonded to two silicon atoms
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d) There are double bonds between silicon and oxygen atoms
Explanation
Answer: (a)
Q.7
The stability of carbon tetrahalides of carbon decreases in the order
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a) CF4 > CCl4 >CBr4 > CI4
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b)CI4 > CBr4 > CCl4 > CF4
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c) CI4 >CCl4 > CBr4 > CF4
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d) CF4 >CBr4 > CCl4 > CI4
Explanation
Down the groups of halides electronegativity decreases, hence difference in electronegativity of C and halide decreases so the stability Answer: (a)
Q.8
Water gas is a mixture of
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a) H2 and Air
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b) CO and H2
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c) CO2 and H2
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d) H2O and CO
Explanation
Answer:(b)
Q.9
Which of the following is amphotoric
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a) CO2
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b) SiO2
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c) SnO2
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d) CaO
Explanation
SnO2 is amphotoric down the group basic character increases Answer: (c)
Q.10
The stability of dihalides of Si, Ge, Sn and Pb increases steadly in sequence... [ AIEEE 2007]
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a) PbX2 << SnX2 << GeX2 << SiX2
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b) GeX2<< SiX2 << SnX2 << PbX2
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c) SiX2 << GeX2 << PbX2 << SnX2
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d) SiX2 << geX2 << SnX2 << PbX2
Explanation
For group 14 stability of dihalid increases down the group Answer: (d)
Q.11
Which of the following is the most ionic?
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a) CCl4
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b) SbCl4
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c) PbCl4
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d) SbCl2
Explanation
In group 14 oxidation state give ionic compounds while +4 oxidation states gives covalent compounds SbCl4 is covalent compound Answer: (d)
Q.12
Which one of the following is not a property of carbon
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a) It exhibits catenation
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b) It forms multiple bonds
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c) Its melting point and boiling points are very high
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d) It is a semi-metal
Explanation
Carbon is non metal Answer:(d)
Q.13
Which of the following is most allotropes of carbon is isomorphous with crystalline silicon?
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a) Coke
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b) Diamond
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c) Graphite
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d) Coal
Explanation
Diamond and crystalline Si have three dimensional tetrahedral structure Answer: (b)
Q.14
Carborundum is obtained when silica is heated at high temperature with .. [ IIT 1982]
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a) Carbon
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b) Carbon monoxide
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c) Carbon dioxide
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d) Calcium carbonate
Explanation
SiO2 + 3C → SiC + 2CO Answer: (a)
Q.15
In the carbon family the elements other than carbon do not form pπ-pπ bonds because the atomic orbitals are to
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a) small and diffuse to under go sideways overlap
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b) large and diffuse to under go sideways overlap
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c) small and far to under go sideways overlap
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d) large and far to under go sideways overlap
Explanation
Answer: (b)
Q.16
Which of the following gas has highest calorific value?
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a) Coal gas
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b) Water gas
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c) Producer gas
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d) Carbon dioxide gas
Explanation
Answer:(a)
Q.17
Out of following which do not form mono-oxide ..
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a) Lead
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b) Tin
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c) Germanium
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d) Silicon
Explanation
Answer: (d)
Q.18
Moderate electrical conductivity is shown by .. [ IIT 1982]
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a) Silica
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b) Graphite
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c) Diamond
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d) Carborundum
Explanation
Answer: (b)
Q.19
Which of the following statements is correct?
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a) Graphite is thermodynamically more stable than diamond
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b) Diamond is thermodynamically more stable than graphite
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c) Graphite changes spontaneously to diamond
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d) Diamond changes to graphite spontaneously
Explanation
Answer: (a)
Q.20
Carbogen is
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a) Pure form of carbon
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b) CPOCl2
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c) Mixture of CO and CO2
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d) Mixture of O2 and CO2
Explanation
Answer:(d)
Q.21
SiO2 is reacted with sodium carbonate, What is the gas liberated/
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a) CO
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b) O2
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c) CO2
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d) O3
Explanation
SiO2 + Na2CO3 → Na2SiO3 + CO2 Answer: (c)
Q.22
The species that does not contain peroxide ions is .. [ IIT 1992]
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a) PbO2
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b) H2O2
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c) SrO2
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d) BaO2
Explanation
PbO2 is ionic compound Answer: (a)
Q.23
Chemically zeolites are
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a) Aluminosilicate
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b) Calcium aluminosilicate
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c) Hydrated aluminosilicate
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d) None
Explanation
Answer: (c)
Q.24
HCOOH reacts with concentrated H2SO4 to produce
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a) CO
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b) CO2
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c) SO2
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d) NO2
Explanation
HCOOH + H2SO4 → CO + H2O Answer:(a)
Q.25
Thomas slag is ..
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a) Ca3(PO4)2
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b) CaSiO3
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c) Mixture of a and b
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d) Na2SiO3
Explanation
Answer: (c)
Q.26
(Me)SiCl2 on hydrolysis will produce .. [ IIT 2003]
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a) (Me)2Si(OH)2
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b) (Me)2Si = O
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c) -[(Me)2Si - O]-n
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d) (Me)2SiCl(OH)
Explanation
Dialkyl dichlorosilanes on hydrolysis followed by polymearization produce silicones Answer: (c)
Q.27
CCl4 does not show hydrolysis but SiCl4 is readily hydrolyzed because
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a) Carbon cannot expand its octet but silicon can expand
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b) Electronegativity of carbon is higher than silicon
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c) Ionization energy of carbon is higher than of silicon
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d) Carbon form double and triple bonds but not silicon
Explanation
Answer: (a)
Q.28
Carbon monoxide reacts with Cl2 in presence of sunlight to give
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a) Phosgene
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b) COCl
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c) Phosphine
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d) CCl4
Explanation
Phosgene is COCl2 Answer:(a)
Q.29
Which one of the following is correct set for SiO2
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a) Linear, acidic
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b) Linear, basic
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c) Tetra hedral, acidic
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d) Angular, basic
Explanation
O-Si-O angles are perfectly tetrahedral (109.5°) because due to repulsion between the lone pair and bond pairs the bonds are shifted slightly away from the lone pair, thus in retrospect they are shifted towards each other. SiO2 is not formed of molecules, but is a giant covalent lattice. In it every silicon atom is surrounded by four oxygen atoms, while each oxygen atom is surrounded by two silicon atoms. Answer: (c)
Q.30
A metal, M forms chlorides in +2 and +4 oxidation states. Which of the following statements about these chlorides is correct? [ AIEEE 2006]
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a) MCl2 is more volatile than MCl4
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b) MCl2 is more soluble in anhydrous ethanol than MCl4
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c) MCl2 is more ionic than MCl4
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d) MCl2 is more easily hydrolyzed than MCl4
Explanation
Compounds of metal in lower oxidation state are more ionic than those in higher state. This is in accordance with Fajan's rule Answer: (c)
0 h : 0 m : 1 s
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