Description : Main constituent of natural gas is (A) CH4 (B) C2H2 (C) C2H4 (D) C2H6
Last Answer : (A) CH4
Description : Arrange the following in the increasing order of C-C bond length- C2H6 , C2H4, C2H2
Last Answer : Ans. C2H2 < C2H4 < C2H6
Description : What is the order of C-H bond length in C2H6 and C2H4 and C2H2 ?
Last Answer : c2h6>c2h4 >c2h2
Description : The triple bond between the carbon atoms causes acetylene, C2H2, to have which of the following shapes? w) trigonal planar (pron: try-gon-al) x) linear y) tetrahedral z) trigonal bipyramidal
Last Answer : ANSWER: X -- LINEAR
Description : Which combination of gases is suitable for fruit ripening? (a) 80% CH4 and 20% CO2 (b) 80% CO2 and 20% O2 (c) 80% C2H4 and 20% CO2 (d) 80% CO2 and 20% CH2
Last Answer : (c) 80% C2H4 and 20% CO2
Description : If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH4(g) + C2H4(g) ⇌ C3H8(g) will be __________ Kcal. (A) -19.4 (B) -30.2 (C) 55.2 (D) -55.2
Last Answer : (A) -19.4
Description : Producer gas consists mainly of (A) CO, CO2 N2 , H2 (B) CO, H2 (C) H2 , CH4 (D) C2H2 , CO2 , H2
Last Answer : (A) CO, CO2 N2 , H2
Description : Apart from tetrahedral geometry another possible geometry for CH4 is square planar with four hydrogen atoms at the corners of the square and the carbon atom at the centre.Explain why CH4 is not square planar?
Last Answer : Ans For square planar arrangement hybridization is dsp2 which is not possible with Carbon as it does not have d orbital with it
Description : Diamond is harder than graphite because of – (1) difference in layers of atoms (2) tetrahedral structure of diamond (3) difference of crystalline structures (4) None of these
Last Answer : (1) difference in layers of atoms Explanation: Diamond is harder than graphite because diamond has a more complex structure. Diamond's structure is like many pentagons connected together, each pentagon ... together in some way. Graphite's structure is very loose, with its bonds forming layers.
Description : (a) If the radius of the Br ion is 0.182 nm, how large a cation can fit in each of the tetrahedral hole. (b) AgI crystallizes in a cubic closed packed ZnS structure. What fraction of tetrahedral site ... Ag ion ? (c) At what temp. range, most of the metals becomes super conductors ?
Last Answer : (a) For a tetrahedron the limiting ratio is 0.225 – 0.414 For largest cation highest value 0.414 would be considered. r + / r– = 0.414 r + = 0.414 × 0.182 = 0.075 nm. (b) In FCC there are 8 tetrahedral voids. Out of this ½ is occupied by Ag cation. (c) 2 k – 5 k.
Description : The structure of an ammonia molecule can best be described as: w) linear x) tetrahedral y) pyramidal z) triagonal planar
Last Answer : ANSWER: Y -- PYRAMIDAL
Description : Diamond is harder than graphite because of : (1) difference in layers of atoms (2) tetrahedral structure of diamond (3) difference of crystalline structures (4) None of these
Last Answer : difference in layers of atoms
Description : Which of the following statements about ethene, C2H4, is incorrect? (a) The H–C–H bond angles are approximately 109.5°. (b) There is a total of five sigma bonds. (c) The carbon atoms are sp2 hybridized. (d) The H–C–H bond angles are approximately 120°.
Last Answer : The H–C–H bond angles are approximately 109.5°.
Description : Point group C2h belong to the molecule a. H2O b. BeH2 c. Cis C2H4 d. Trans C2H4
Last Answer : d. Trans C2H4
Description : Which of the following molecules exhibit resonance w) OF3 x) HNO3 y) C2H4 z) PCl3
Last Answer : ANSWER: X -- HNO3
Description : Diamond structure can be considered as ZnS (Zinc blend) structure in which each `Zn^(2+)` in alternate tetrahedral void and `S^(2-)` in cubic close pa
Last Answer : Diamond structure can be considered as ZnS (Zinc blend) structure in which each `Zn^(2+)` in alternate tetrahedral void ... . 6.92 Å C. 1.73 Å D. 3 Å
Description : Asseration: `SeCl_(4)`, does not havea tetrahedral structure. Reason: `Se` in `SeCl_(4)` has two lone pairs.
Last Answer : Asseration: `SeCl_(4)`, does not havea tetrahedral structure. Reason: `Se` in `SeCl_(4)` has two lone pairs.
Description : In its reaction with silver nitrate, C2H2 shows – (1) Oxidising property (2) Reducing property (3) Basic property (4) Acidic property
Last Answer : (4) Acidic property Explanation: When treated with ammoniacal silver nitrate solution alkynes form white precipitate of silver acetylides.
Description : Point group C2v belong to the molecule a. H2O b. BeH2 c. NH3 d. C2H2
Last Answer : a. H2O
Description : In its reaction with silver nitrate, C2H2 shows (1) Oxidising property (2) Reducing property (3) Basic property (4) Acidic property
Last Answer : Acidic property
Description : The species having tetrahedral shape is
Last Answer : The species having tetrahedral shape is A. `[PdCl_(4)]^(2-)` B. `[Ni(CN)_(4)]^(2-)` C. `[Pd(CN)_(4)]^(2-)` D. `[Ni(Cl)_(4)]^(2-)`
Description : The species having tetrahedral shape is :
Last Answer : The species having tetrahedral shape is : A. `[PdCl_(4)]^(2-)` B. `[Ni(CN)_(4)]^(2-)` C. `[Pd(CN)_(4)]^(2-)` D. `[NiCl_(4)]^(2-)`
Description : All the following complexes show decrease in their weights when placed in a magnetic balance then the group of complexes having tetrahedral geometry i
Last Answer : All the following complexes show decrease in their weights when placed in a magnetic balance then the group of ... III C. I,III,IV D. none of these
Description : For the gaseous phase chemical reaction, C2H4(g) + H2O(g) ↔ C2H5OH(g), the equilibrium conversion does not depend on the (A) Steam to ethylene ratio (B) Temperature (C) Pressure (D) None of these
Last Answer : (D) None of these
Description : How much co2 is produced when 4000g of c2h2 burns completely?
Last Answer : Need answer
Description : Gross calorific value will be equal to the net calorific value for (A) H2 (B) C2H2 (C) CO (D) C2H6
Last Answer : (C) CO
Description : Pick out the exothermic reaction out of the following: (A) C + H2O = CO + H2 (B) CaC2 + H2O = Ca(OH)2 + C2H2 (C) MgCO3 = MgO + CO2 (D) All (A), (B) and (C)
Last Answer : (B) CaC2 + H2O = Ca(OH)2 + C2H2
Description : The substance used as a smoke screen in warfare is (A) C2H2 (B) SiCl4 (C) P2O5 (D) PCl5
Last Answer : Option B
Description : Why are low spin tetrahedral complexes not formed? -Chemistry
Last Answer : Law spin tetrahedral complexes are rarely observed because orbital splitting energies for tetrahedral complexes are sufficiently large for forcing pairing.
Description : What is the hybridization and geometry of the carbonyl carbon in carboxylic acids and their derivatives? (a) sp3, tetrahedral (b) sp2, trigonal planar (c) sp2, tetrahedral (d) sp3, trigonal planar
Last Answer : sp2, trigonal planar
Description : Why do aldehydes undergo nucleophilic addition reactions while esters undergo nucleophilic acyl substitution reactions? (a) The carbonyl carbon of an ester is more electrophilic than that of an aldehyde. (b) ... adds to an aldehyde, neither H− nor R− can be eliminated since they are strongly basic
Last Answer : Once the nucleophile adds to an aldehyde, neither H− nor R− can be eliminated since they are strongly basic
Description : Sp3d2 hybridization of central atom of a molecule would lead to............ geometry. a) square planar b) Tetrahedral c) Trigonal bipyramidal d) Octahedral
Last Answer : d) Octahedral
Description : Which of the following statements is not valid for oxoacids of phosphorus? (1) All oxoacids contain atleast one P = O unit and one P – OH group (2) . (3) Hypophosphorous acid is a diprotic acid. (4) All oxoacids contain tetrahedral four coordinated phosphorous
Last Answer : Orthophosphoric acid is used in the manufacture of triple superphosphate.
Description : What is the molecular geometry of thiocyanate (pron: thie-owe-SIE-a-nate) ion (SCN minus 1)? w) linear x) angular y) tetrahedral z) pyramidal
Last Answer : ANSWER: W -- LINEAR
Description : What is the molecular geometry of the Bromine Tetraflouride ion (B-F-4-minus 1) w) linear x) angular y) tetrahedral z) pyramidal
Last Answer : ANSWER: Y -- TETRAHEDRAL
Description : What is the molecular geometry of XeO2 (Xenon Dioxide)? w) linear x) angular y) tetrahedral z) trigonal planar
Last Answer : ANSWER: X -- ANGULAR
Description : The molecular shape of formaldehyde, H2CO, is: w) linear x) trigonal planar y) bent z) tetrahedral
Last Answer : ANSWER: X -- TRIGONAL PLANAR
Description : Which of the following describes the orientation of bonds in an sp3 hybridized atom? w)triagonal x)linear y)tetrahedral z)planar
Description : Identify the type of reaction(s) in the following equations. (i)CH4 + 2O2 CO2 + 2 H2O (ii) Pb(NO3)2 + 2KI ——–>Pbl2 + 2KNOs (iii) CaO + H2O ——–> Ca(OH)2 (iv) CuSO4 + Zn ——–> ZnSO4 + Cu -Chemistry
Last Answer : Answer. (i) Combustion reaction and oxidation reaction. (ii)Double displacement reaction and precipitation reaction. (iii) Combination reaction. (iv) Displacement reaction.
Description : Which of the following statements is true about Methane? (1) It is widely used as a fuel. (2) It is a major component of bio-gas and Compressed Natural Gas. (3) It has a formula CH4. (4) All of the above
Last Answer : (4) All of the above Explanation: All the statements mentioned above are correct. Furthermore, Hydrogen has a valency of 1 while Carbon has four valence electrons. In order to achieve ... , carbon shares these electrons with four atoms of hydrogen resulting in formation of methane- CH4.
Description : Is the bond energy of all the four C-H bonds in CH4 molecule equal? If not then why ? How is C-H bond energy then reported?
Last Answer : Ans. No because after breaking of C-H bonds one by one, the electronic environments change. The reported value is the average of of the bond dissociation energies of the four C-H bonds.
Description : Apart from tertrahedral geometry ,another possible geometry for CH4 is square planar with the four H atoms at the corners of square and C atom at its centre. Explain why CH4 is not square planar.
Last Answer : Ans. In square planar geometry , the bond angle will be 90 ° which is less than bond angle in tetrahedral geometry ( 109.5 °).Therefore repulsive forces in square planar will be more and it will be less stable as compared to tetrahedral geometry.
Description : Which of the following will have the lowest boiling point? (a) CH3Cl (b) CH4 (c) CH2Cl2 (d) CHCl3
Last Answer : CH4
Description : Marsh gas mainly contains (a) CH2=CH2 (b) CH4 (c) H2S (d) CHCl3
Description : Which of the following is the strongest acid? (a) HI (b) H2O (c) CH4 (d) CH3OH
Last Answer : HI
Description : The number of vibrational modes for CH4 molecule is____. (a) 9 (b) 10 (c) 8 (d) 7
Last Answer : (a) 9
Description : Which of the following molecules has a permanent electric dipole moment? w) H2O x) Cl2 y) CH4 z) N2
Last Answer : ANSWER: W -- H2O
Description : Which of these molecules is bound by ionic bonds? w) H2O x) CH4 y) NaCl z) C6H12O6
Last Answer : ANSWER: Y -- NaCl
Description : Which of the following molecules has a dipole moment? w) BF3 x) NH3 y) CCL4 z) CH4
Last Answer : ANSWER: B -- NH3
Description : For which molecule can the bonding be described in terms of sp3 hybrid orbitals of the central atom? w) CH4 x) SF6 y) BF3 z) PCL5
Last Answer : ANSWER: B -- CH4