Description : Write shape of following molecules: a) Ammonia b) Phosphorous Pentachloride
Last Answer : Ans: a) Pyramidal b) Trigonal bipyramidal
Description : Give reasons i) H2O is a liquid but H2S a gas. ii) Ammonia has higher boiling point than phosphine ii) Krypton & xenon make compounds.
Last Answer : Ans: i) Hydrogen bond is found in H2O but not in H2S. ii) Hydrogen bond is found in NH3 but not in PH3. iii) Because they have low ionization energy.
Description : Which aerosol deplete ozone layer ?
Last Answer : Ans C.F.C
Description : Write the formula of tear gas .
Last Answer : Ans : CCl3 NO2
Description : Why is helium used in diving apparatus ?
Last Answer : Ans: Because heliun is very low solubility in blood
Description : Why H3 PO3 is dibasic and H3PO4 is tribasic ?
Last Answer : Ans In H3PO3 only two replacable hydrogen but inH3PO4 , three hydrogens are replacable .
Description : Are all the five bonds in PCl5 molecule equivalent ?
Last Answer : Ans – PCl5 has a trigonal bipyramidal structure and the three equatorial p-cl bonds are equivalent . while trhe two axial bonds are different and longer than equatorial bonds.
Description : How is the presence of SO2 detected ?
Last Answer : Ans : 1. It has pungent characteristic smell . 2. It decolourises KMn O4 solution 3. It turns acidified K2 Cr2 O7 green
Description : Why is fluorine stronger Oxidising agent ?
Last Answer : Ans: Due to (a) Low enthalpy of dissociation (b) high enthalpy of Hydration of F-
Description : Halogens have maximum negative electron gain enthalpy in the respective periods in the P. T Why ?
Last Answer : Ans Due to smallest size and high effective nuclear charge , readily accept one electron to acquire noble gas electronic configuration
Description : Which forms of Sulphur show paramagnetic behaviour ?
Last Answer : Ans : In Vapour State sulphurPartly exists as S2 molecule which has two unpaired electrons in the * Orbitals hence exhibit paramagnetic
Description : How is ammonia prepared? Write chemical reaction involved in the Haber’s process.
Last Answer : i) Ammonia is prepared by the combination of hydrogen and nitrogen in the ratio of 3:1. ii) The used catalyst is iron oxide. The promotors are potassium and aluminium oxides. iii) The required conditions are high pressure and moderate temperature. N2 + 3H2 → 2NH3
Description : Nitrogen shows anomalous behaviour in the group. Why?
Last Answer : Ans: i) Small size ii) High electro negativity iii) Absence of vacant d-orbital.
Description : Give reasons: a) Phosphorous pentachloride is unstable. b) Phosphorous trichloride fumes in moisture.
Last Answer : Ans: a) Because of two longer axial bonds. b) Because it reacts with water and forms hydrochloric acid.
Description : Ortho phosphoric acid is triprotic but phosphoric acid is diprotic. Why?
Last Answer : Ans: Because of their structures ortho phosphoric acid and phosphoric acid have three and two ionisable hydrogen.
Description : Ammonia is water soluble. Why?
Last Answer : Ans: It forms hydrogen bond with water.
Description : Why is Nitrogen relatively inert?
Last Answer : Ans: Because of a triple bond with high bond energy.
Description : Why Nitrogen is a gas whereas Phosphorous is a solid?
Last Answer : Ans: Nitrogen molecules have less Vander Waal’s forces of attraction whereas molecular phosphorous has more Vander Waal’s forces of attraction.
Description : Why is Ammonia a good complexing agent?
Last Answer : Ans: Because of lone pair of electrons on N.
Description : Why is phosphine weaker base than Ammonia?
Last Answer : Ans: P is bigger than N, therefore lone pair of electrons are less available on P than N.
Description : Which of the following molecules is linear? w) SO2 x) O3 y) XeF2 z) H2S
Last Answer : ANSWER: Y -- XeF2
Description : Is XeF4 molecular or ionic?
Last Answer : This compound has covalent bonds.
Description : What is the predicted shape, bond angle, and hybridization for CH3+? (a) trigonal planar, 120°, sp2 (b) trigonal planar, 120°, sp3 (c) trigonal planar, 109.5°, sp2 (d) trigonal pyramidal, 120°, sp2
Last Answer : trigonal planar, 120°, sp2
Description : 13. Which one of the following pairs is isostructural (i.e. having the same shape and hybridization)? (1) 4 4 [BF and NH ] (2) 3 3 [BCl and BaCl ] (3) 3 3 [NH and NO ] (4) [NF3 and BF3 ] Sol: [1] In both the compounds, central atom i
Last Answer : (1) 4 4 [BF and NH ]
Description : Hybridization and shape of `XeF_(4)` is
Last Answer : Hybridization and shape of `XeF_(4)` is A. `sp^(3)d`, trigonal bipyramidal B. `sp^(3)`, tetrahedral C ... `, square planar D. `sp^(3)d^(2)`, hexagonal
Description : Compare the following complexes with respect to their shape, magnetic behaviour and the hybrid orbitals involved : (i) [CoF4]2- (ii) [Cr(H2O)2(C2O4)2]– (iii) [Ni(CO)4] (Atomic number : Co = 27, Cr = 24, Ni = 28) -Chemistry
Last Answer : (i) [COF4]2_ : Tetrafluorido cobalt (III) ion Coordination number = 4 Shape = Tetrahedral Hybridisation = sp3 Important Questions for Class 12 Chemistry Chapter 9 Coordination Compounds Class 12 Important Questions 7
Description : For the complex [Fe(en)2Cl2], Cl, (en = ethylene diamine), identify (i) the oxidation number of iron, (ii) the hybrid orbitals and the shape of the complex, (iii) the magnetic behaviour of the complex, (iv) ... an optical isomer also, and (vi) name of the complex. (At. no. of Fe = 26) \ -Chemistry
Last Answer : i) [Fe(en)2Cl2] Cl or x + 0 + 2 (-1) + (-1) = 0 x + (- 3) = 0 or x = + 3 ∴ Oxidation number of iron, x = + 3 (ii) The complex has two bidentate ligands and two ... )2Cl2] Cl, only cis-isomer shows optical isomerism. (vi) Name of complex: Dichloridobis (ethane-1, 2- diamine) Iron (III) chloride
Description : What is the hybridization of carbon atoms in alkanes ?
Last Answer : Ans. Sp3
Description : What is the hybridization of carbon in carbon dioxide ?
Last Answer : Ans sp
Description : The hybridization of nitrogen in an amine is (a) sp (b) sp3 (c) sp2 (d) sp4
Last Answer : sp3
Description : What is the hybridization of the carbon atom in CH3NH2? (a) 3sp3 (b) sp (c) sp2 (d) sp3
Description : What is the hybridization of the nitrogen atom in CH3NH2? (a) sp (b) sp2 (c) sp3 (d) s-sp3
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 : What is the hybridization of the carbonyl oxygen in carboxylic acids? (a) sp (b) sp2 (c) sp3 (d) s-sp2
Last Answer : sp2
Description : What is the hybridization of the oxygen atom in CH3CH2OH? (a) sp (b) 4sp3 (c) sp2 (d) sp3
Description : What is the hybridization of the central carbon of allene (1,2-propadiene)? (a) sp (b) sp2 (c) sp3 (d) p
Last Answer : sp
Description : How many atoms are attached to an atom having a sp hybridization? (a) 0 (b) 1 (c) 2 (d) 3
Last Answer : 2
Description : What is the hybridization of the carbon atoms numbered 1 and 2 respectively in the following structure? (a) sp3, sp2 (b) sp2, sp2 (c) sp, sp (d) sp2, sp
Last Answer : sp2, sp
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 : 9. Which one of the following is a case of wrong matching ? (1) Callus - Unorganised mass of cells produced in tissue culture (2) Somatic hybridization - Fusion of two diverse cells (3) Vector DNA - Site for t-RNA synthesis (4) Micropropagation - In vitro production of plants in large number
Last Answer : Vector DNA - Site for t-RNA synthesis
Description : What is the hybridization assumed for phosphorus in PCl5?
Last Answer : ANSWER: d sp3
Description : Which of the following phrases is NOT appropriate for a description of benzene? w) characteristic reactivity of an alkene x) volatile liquid y) aromatic hydrocarbon z) resonance hybridization
Last Answer : ANSWER: W -- CHARACTERISTIC REACTIVITY OF AN ALKENE
Description : The strength and quality of concrete depends upon (i)Grading of aggregates (ii)Shape of aggregates (iii)Surface area of aggregates (iv)Surface texture of aggregates [ A ] i, ii and iv [ B ] ii, iii and iv [ C ] i, iii and iv [ D ] i, ii, iii and iv
Last Answer : [ D ] i, ii, iii and iv
Description : State the function and shape of following parts used in induction type energy meter: i) Series magnet ii) Shunt magnet iii) Al disc iv) Brake magnet
Last Answer : i) Series magnet: produce flux proportional to current (load current) of circuit and interact in the aluminum disc with flux produced by voltage magnet for torque production. Its shape is like letter U. ii) ... : brakes the motion of the aluminum disc or slows it down. Its shape is like letter C.
Description : What is somatic hybridization in plants? -Biology
Last Answer : answer:
Description : What is the role of polyethylene glycol in somatic hybridization? -Biology
Description : What is interspecific hybridization? -Biology
Description : What are the main steps that are involved in the hybridization process? -Biology
Description : Difference between hybridization and inbreeding? -Biology