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 : The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void. (A) Equal to (B) Greater than (C) Less than (D) Either (A), (B) or (C); depends on the size of atom
Last Answer : (C) Less than
Description : Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure. (A) Hexagonal close, packed (hcp) (B) Face centred cubic (fcc) (C) Body centred cubic (bcc) (D) Simple cubic
Last Answer : (D) Simple cubic
Description : (1) they contain free electrons Explanation: Metals typically consist of closepacked atoms, meaning that the atoms are arranged like closely packed spheres. Two packing motifs are common, one ... surrounded by six neighboring atoms. Several metals adopt both structures, depending on the temperature.
Last Answer : Helium gas is filled in ballons because (1) its atomic number is 2 (2) it is lighter than air (3) it is one of the constitutents of water (4) it is a noble gas
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 : There are one octahedral void and __________ tetrahedral void in the closest packing of atoms. (A) One (B) Two (C) Three (D) None of these
Last Answer : Option B
Description : How many neighboring atoms are in contact with each a in a hexagonal close-packed structure?
Last Answer : ANSWER: 12
Description : How many neighboring atoms are in contact with eac atom in a monatomic body-centered cubic structure. w) 4 x) 6 y) 8 z) 12
Last Answer : ANSWER: Y -- 8
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 : The most common complex ions have octahedral geometry. What is the coordination number of the central ion in an octahedral complex?
Last Answer : ANSWER: SIX
Description : For the octahedral complexes of `Fe^(3+)` in `SCN^(-)`(thiocyanato-S) and in `CN^(-)` ligands environment, the difference between the spin-only magnet
Last Answer : For the octahedral complexes of `Fe^(3+)` in `SCN^(-)`(thiocyanato-S) and in `CN^(-)` ligands ... the nearest integer) is : [Atomic number of Fe=26]
Description : Explain the following : (i) Low spin octahedral complexes of nickel are not known. (ii) The π-complexes are known for transition elements only. (iii) CO is a stronger ligand than NTL, for many metals. -Chemistry
Last Answer : (i) The electronic configuration of Ni is [Ar] 3d8 4s2 which shows that it can only form two types of complexes i.e. square planar (dsp2) in presence of strong ligand and tetrahedral (sp3) in ... more splitting of d-orbitals and moreover it is also able to form π bond due to back bonding.
Description : How many EDTA (lethylendiamine tetra acetic acid) molecules are required to make an octahedral complex with a Ca2+ ion.
Last Answer : EDTA is a hexadentate ligand therefore only one EDTA molecule is required to form octahedral complex.
Description : The equilibrium constant for the gas phase reactio A + B = C + D is 10-3. The rate of the forward reaction is 10-11 cubic centimeters per molecule per second. What is the rate constant of ... second y) 10-10 cubic centimeters per molecule per second z) 10-14 cubic centimeters per molecule per second
Last Answer : ANSWER: Z -- 10-14 CUBIC CENTIMETERS PER MOLECULE PER SECOND
Description : The co-ordination number in simple cubic structure is (A) 4 (B) 6 (C) 8 (D) 12
Last Answer : (B) 6
Description : The co-ordination number of a simple cubic structure is
Last Answer : The co-ordination number of a simple cubic structure is 6.
Description : Pick out the wrong statement. (A) With decrease in feed temperature, the number of plates required for binary distillation decreases for a given L/V' ratio (B) The extraction per unit ... and its crosssection is wider at the bottom (D) Vander wall adsorption is also called chemisorption
Last Answer : (D) Vander wall adsorption is also called chemisorption
Description : The number of geometrical isomers for octahedral `[CoCl_(4)(NH_(3))_(2)]^(-)`, square planar `[AuBr_(2)Cl_(2)]^(-)` and `[PtCl_(2)(en)]` are
Last Answer : The number of geometrical isomers for octahedral `[CoCl_(4)(NH_(3))_(2)]^(-)`, square planar `[AuBr_(2)Cl_(2)]^(-) ... are A. 4,2 B. 2,2 C. 3,2 D. 2,3
Description : The number of unpaired electrons in `d^(6)`, low spin, octahedral complex is :
Last Answer : The number of unpaired electrons in `d^(6)`, low spin, octahedral complex is : A. 4 B. 2 C. 1 D. 0
Description : In molecule of calcium sulfide calcium has two valence electron bonds and a sulfur atom has six valence electrons. How many lone pairs of electrons are present in the Lewis structure of calcium?
Last Answer : What is the answer ?
Description : The ratio of the volume of water present in a given soil mass to the total volume of its voids, is known (A) Porosity (B) Void ratio (C) Percentage voids (D) Degree of saturation
Last Answer : Answer: Option D
Description : The ratio of volume of water present in a given soil sample to the total volume of voids in it is known as a) Percentage of air voids b) Degree of saturation * c) Void rat
Last Answer : b) Degree of saturation *
Description : What is the radius of an imaginary shell around an atom which determines how close two nonbonded atoms may approach each other called?
Last Answer : ANSWER: VAN DER WAALS RADIUS
Description : Pick up the correct statement from the following: (A) Coefficient of compressibility is the decrease in void ratio per unit increase of pressure (B) The percent settlement at any time is called degree of consolidation (C) Time factor is a dimensionless quantity (D) All the above
Description : Materials having __________ lattice structure are usually most ductile. (A) FCC (B) BCC (C) HCP (D) Cubic
Last Answer : (A) FCC
Description : Pick out the wrong statement. (A) Metal/alloys having hexagonal crystal lattice structure are less malleable than those having cubic crystal lattice structure (B) Metal/alloys having body centred cubic ... D) Both ferritic & austenitic stainless steel has a face centred cubic (fcc) crystal structure
Last Answer : (C) Tungsten has a body centred cubic (bcc) crystal lattice structure
Description : Nickel as a material of construction (A) Is used as an alloying element for both ferrous & non-ferrous alloys (B) Is paramagnetic below 415° C (its Curie temperature) (C) Diamagnetic (D) Has a body centred cubic (bcc) crystal lattice structure
Last Answer : (A) Is used as an alloying element for both ferrous & non-ferrous alloys
Description : Most of the common metals have __________ crystal structure. (A) Cubic (B) Hexagonal (C) Orthorhombic (D) None of these
Last Answer : (A) Cubic
Description : The crystal structure of most of the common metals is (A) Orthorhombic (B) Cubic (C) Hexagonal (D) None of these
Last Answer : (B) Cubic
Description : Mild steel has __________ crystal lattice structure. (A) Face centred cubic (fcc) (B) Body centred cubic (bcc) (C) Orthorhombic (D) Cubic
Last Answer : (B) Body centred cubic (bcc)
Description : A packed tower compared to a plate tower for a particular mass transfer operation (A) Incurs smaller pressure drop (B) Allows installation of cooling coils (C) Is less costly when built in large sizes/diameters (D) Is more suitable, if suspended solids are present in fluid stream
Last Answer : (A) Incurs smaller pressure drop
Description : An epithelial tissue which has thin flat cells, arranged edge to edge so as to appear like closely packed tiles, is found to be present at (a) outer surface of ovary (b) inner lining of Fallopian tube (c) inner lining of stomach (d) inner lining of cheeks.
Last Answer : (d) inner lining of cheeks.
Description : Traces of tar fog present in the coke oven gas is removed by (A) Cyclone separator (B) Wet packed scrubber (C) Electrostatic precipitator (D) Washing with monoethanolamine
Last Answer : (C) Electrostatic precipitator
Description : Which of the following same diameter columns gives lowest pressure drop per unit height? (A) Bubble-cap column (B) Sieve-plate column (C) Packed column (stacked)
Last Answer : (C) Packed column (stacked)
Description : For laminar flow of a fluid through a packed bed of spheres of diameter d, the pressure drop per unit length of bed depends upon the sphere diameter as (A) d (B) d 2 (C) d 4 (D) d
Last Answer : (D) d
Description : A yellow coloured crystalline substance gave a colourless gas `X` on reaction with fluorine, which is thermally stable and has octahedral geometry. `X
Last Answer : A yellow coloured crystalline substance gave a colourless gas `X` on reaction with fluorine, which is ... and has octahedral geometry. `X` can be
Last Answer : A yellow coloured crystalline substance gave a colourless gas `X` on reaction with fluorine, which is thermally stable ... `SF_(2)` D. `S_(2)F_(6)`
Description : Crystal field stabilization energy for high spin `d^4` octahedral complex is
Last Answer : Crystal field stabilization energy for high spin `d^4` octahedral complex is A. `-0.6 Delta_(0)` B. `-1. ... `-1.6Delta_(0)+P` D. `-1.2Delta_(0)`
Description : According to the Crystal Field Theory, the energy of `d_(xy)` orbital is lower than `d_(x^(2)-y^(2))` in an octahedral complex because
Last Answer : According to the Crystal Field Theory, the energy of `d_(xy)` orbital is lower than `d_(x^(2)-y^(2))` ... d_(x^(2)-^(2))` orbital is away the ligands.
Description : An octahedral complex of `Co^(3+)` is diamagnetic . The hybridisation involved in the formation of the complex is :
Last Answer : An octahedral complex of `Co^(3+)` is diamagnetic . The hybridisation involved in the formation of the complex is : A. ... `d^(2)sp^(3)` D. `sp^(3)d`
Description : An octahedral complex with molecular composition `M.5NH_(3).Cl.SO_(4)` has two isomers. A and B. The solution A gives a white precipitation with `AgNO
Last Answer : An octahedral complex with molecular composition `M.5NH_(3).Cl.SO_(4)` has two isomers ... isomerism C. coordination isomers D. Geometrical isomerism
Description : The octahedral complex of a metal ion `M^(3+)` with four monodentate ligands `L_(1),L_(2),L_(3) and L_(4)` absorb wavelength in the region of red, gre
Last Answer : The octahedral complex of a metal ion `M^(3+)` with four monodentate ligands `L_(1),L_(2),L_(3) and L_(4)` ... `L_(1) lt L_(2) lt L_(4) lt L_(3)`
Description : In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of `Delta_o` be the highest?
Last Answer : In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of `Delta_o` be the highest? A. ... 3+)` D. `[Co(CN)_(6)]^(3-)`
Description : How many EDTA molecules are required to make an octahedral complex with a `Ca^(2+)` ion?
Last Answer : How many EDTA molecules are required to make an octahedral complex with a `Ca^(2+)` ion? A. Six B. Three C. One D. Two
Description : Addition of excess aqueous ammonia to a pink coloured aqueous solution of `MCl_(2).6H_(2)O(X)` and `NH_(4)Cl` gives an octahedral complex Y in the pre
Last Answer : Addition of excess aqueous ammonia to a pink coloured aqueous solution of `MCl_(2).6H_(2)O(X)` ... solution is pink D. Z is a tetrahedral complex.
Description : Which kind of isomerism is exhibited by octahedral `[Co(NH_(3))_(4)Br_(2)]Cl` ?
Last Answer : Which kind of isomerism is exhibited by octahedral `[Co(NH_(3))_(4)Br_(2)]Cl` ? A. ... and optical C. Optical and ionization D. Geometrical only
Description : How many isomeric forms are possible for the octahedral complex. `[Rh(en)_(2)(NO_(2))(SCN)]^(+)` ?
Last Answer : How many isomeric forms are possible for the octahedral complex. `[Rh(en)_(2)(NO_(2))(SCN)]^(+)` ?
Description : Chromium hexacabonyl is an octahedral compound involving :
Last Answer : Chromium hexacabonyl is an octahedral compound involving : A. `sp^(3)d^(2)` B. `dsp^(2)` C. `d^(2)sp^(3)` D. `dsp^(3)`