Description : The number of lone pairs of electrons present in central atom of `CIF_3` is:
Last Answer : The number of lone pairs of electrons present in central atom of `CIF_3` is:
Description : The number of lone pairs on central atom in `XeF_2, XeF_4 and XeF_6` are:
Last Answer : The number of lone pairs on central atom in `XeF_2, XeF_4 and XeF_6` are: A. (A) 1,2,3 B. (B) 3,2,1 C. (C) 2,2,1 D. (D) 1,3,2
Description : Which of the following xenon compound has the same number of lone pairs as in `I_(3)^(-)`? (near central atom)
Last Answer : Which of the following xenon compound has the same number of lone pairs as in `I_(3)^(-)`? (near central atom) ... XeO_(3)` C. `XeF_(4)` D. `XeO_(4)`
Description : How many lone pairs of electrons exist on the central atom in ammonia?
Last Answer : One lone pair. The central atom is N (nitrogen) which has 5valence electrons. Three of them are shared with 3 hydrogen atoms,leaving 2 electrons (1 lone pair) on the N.
Description : Which of the following species contains three bond pairs and one lone pair around the central atom? (1) PCl3 (2) H2O (3) BF3 (4) NH2
Last Answer : PCl3
Description : How many electron lone pairs are on the central atom in Hydrogen Sulfide?
Last Answer : ANSWER: TWO
Description : The number of lone pairs of electrons on xenon atom in `XeF_(4)` molecule is
Last Answer : The number of lone pairs of electrons on xenon atom in `XeF_(4)` molecule is A. 4 B. 3 C. 2 D. zero
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 : Where are the two lone pairs of electrons of the oxygen atom in an alcohol molecule located? (a) in two p orbitals (b) in two sp orbitals (c) in two sp2 orbitals (d) in two sp3 orbitals
Last Answer : in two sp3 orbitals
Description : The Refrigerant 'FREON' is – (1) Calcium Tetra Fluoride (2) Difluoro Dichloro Methane (3) Fluorspar and Felspar (4) Hydrofluosilicic Acid
Last Answer : (2) Difluoro Dichloro Methane Explanation: Dichlorodifluorornethane (R-12), is a colourless gas, and usually sold under the brand name Freon-12, is a chlorofluorocarbon halornethane (CFC), used as a ... 1994 clue to concerns about damage to the ozone layer. It is soluble in many organic solvents.
Description : The Refrigerant ‘FREON' is (1) Calcium Tetra Fluoride (2) Difluoro Dichloro Methane (3) Fluorspar and Felspar (4) Hydrofluosilicic Acid
Last Answer : Difluoro Dichloro Methane
Description : Which of the following species is non polar with presence of polar bond and lone pair of electron on central atom.
Last Answer : Which of the following species is non polar with presence of polar bond and lone pair of electron on central atom. A. ... 4)` C. `XeF_(4)` D. `CF_(4)`
Description : Acetamide is a much weaker base than ammonia. This is because (a) the electron withdrawing effect of the C=O group makes the lone pair of electrons on nitrogen atom less available for protonation. (b) ) ... NH2 group. (d) an H atom from the nitrogen is less easily lost from CH3CONH2 than from NH3.
Last Answer : the electron withdrawing effect of the C=O group makes the lone pair of electrons on nitrogen atom less available for protonation
Description : `NH_4ClO_4 + NHO_3 to (A) + (B) oversetDeltato (C )` (neutral oxide) The summation of number of lone pairs and atomicities of compound B and C is .
Last Answer : `NH_4ClO_4 + NHO_3 to (A) + (B) oversetDeltato (C )` (neutral oxide) The summation of number of lone pairs and atomicities of compound B and C is .
Description : Among the following molecules, `(i)XeO_(3)(ii)XeOF_(4)(iii)XeF_(6)` those having same number of lone pairs on `Xe` are:
Last Answer : Among the following molecules, `(i)XeO_(3)(ii)XeOF_(4)(iii)XeF_(6)` those having same number of lone pairs on ... iii) only D. (D) (i),(ii) and (iii)
Description : Total number of lone pairs on Xe in `XeF_(2), XeO_(3)F_(2), XeF_(4), XeF_(6)` is t,u,v & w respectively. Then
Last Answer : Total number of lone pairs on Xe in `XeF_(2), XeO_(3)F_(2), XeF_(4), XeF_(6)` is t,u,v & w respectively. Then A. ... `v +w = 3` C. `u = 0` D. `w = 1`
Description : The number of lone pairs of electrons present on Xe in `XeF_(2)` ?
Last Answer : The number of lone pairs of electrons present on Xe in `XeF_(2)` ? A. 3 B. 4 C. 2 D. 1
Description : In `OF_2`, the number of bond pairs and lone pairs of electrons are respectively,
Last Answer : In `OF_2`, the number of bond pairs and lone pairs of electrons are respectively, A. 2,6 B. 2,8 C. 2,10 D. 2,9
Description : The summation of total no. of lone pairs and `sigma` bonds in in species (A,B and C) is
Last Answer : The summation of total no. of lone pairs and `sigma` bonds in in species (A,B and C) is
Description : How many lone pairs are associated with xenon in xenon difluoride ?
Last Answer : How many lone pairs are associated with xenon in xenon difluoride ? A. 1 B. 2 C. 3 D. 4
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 : How many lone pairs in CCl4?
Last Answer : Zero
Description : Do lone pairs have an effect on bond angles?
Last Answer : Need answer
Description : What shape would a molecule with two bounds groups and two lone pairs have?
Last Answer : The correct answer is: Bent.
Description : Explain why the water molecule has a bent shape and a bond angle less than 109.5° The electron repulsion between the two lone pairs of electrons on the oxygen of water causes the O–H bonds to squeeze close together
Last Answer : The electron repulsion between the two lone pairs of electrons on the oxygen of water causes the O–H bonds to squeeze close together
Description : a=difference in the oxidation number of Cl in the product X and product Y, respectively b= total number of atom in X and Y c=total number of lone pair
Last Answer : a=difference in the oxidation number of Cl in the product X and product Y, respectively b= total number of ... lone pair in X then calculate a+b+c = ?
Description : If two atoms are bonded to a central atom with no ione pairs how will they be arranged?
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 : Pyridine is less basic than trimethylamine because the lone-pair of electrons on N-atom in pyridine resides in (a) sp2 hybrid orbital (b) sp hybrid orbital (c) sp3 hybrid orbital (d) p-orbital
Last Answer : sp2 hybrid orbita
Description : Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage? (A) Smog & ozone (B) Hydrogen fluoride & nitrogen oxides (C) Sulphur dioxide & spray of weed killers (D) Carbon monoxide
Last Answer : (D) Carbon monoxide
Description : When `XeF_(4)` donates its fluoride to `SbF_(5)`, then the states of hybridization of central atoms of cationic part and anionic part of the product f
Last Answer : When `XeF_(4)` donates its fluoride to `SbF_(5)`, then the states of hybridization of central atoms of cationic part ... ` D. `sp^(3)d,sp^(3)d^(2)`
Description : Which of the following pairs is a sedimentary type of biogeochemical cycle? (a) Phosphorus and nitrogen (b) Phosphorus and sulphur (c) Oxygen and nitrogen (d) Phosphorus and carbon dioxide
Last Answer : (b) Phosphorus and sulphur
Description : In which of the following both pairs have correct combination? (a) Gaseous nutrient cycle, Sedimentary nutrient cycle Nitrogen and Sulphur, Carbon and Phosphorus (b) Gaseous nutrient cycle ... (d) Gaseous nutrient cycle, Sedimentary nutrient cycle Carbon and Sulphur, Nitrogen and Phosphorus
Last Answer : (c) Gaseous nutrient cycle, Sedimentary nutrient cycle Carbon and Nitrogen, Sulphur and Phosphorus
Description : Which of the following additives improves the cetane number of diesel? (A) Amyl nitrate (B) Ethyl mercaptan (C) Naphthenic acid (D) Tetra ethyl lead
Last Answer : (B) Ethyl mercaptan
Description : Iso-octane is used as a reference substance in the definition of octane number and it is assigned an octane number value of 100. Iso-octane is chemically known as (A) α-methyl naphthalene (B) 2-2-4 tri methyl pentane (C) 1, 3 butadiene (D) Tetra methyl ethylene
Last Answer : (B) 2-2-4 tri methyl pentane
Description : Assertion :-`CO_(2)` molecules is non-polar while `SO_(2)` Reason : - Carbon atom is smaller than sulphur.
Last Answer : Assertion :-`CO_(2)` molecules is non-polar while `SO_(2)` Reason : - Carbon atom is smaller ... is False. D. If both Assertion & Reason are false
Description : An unknown amino acid has `0.32%` sulphur by mass . If each molecule has one sulphur atom only 1 g of amino acid has . . . . . . . Molecules :-
Last Answer : An unknown amino acid has `0.32%` sulphur by mass . If each molecule has one sulphur atom only 1 g of amino ... C. `6.02xx10^(24)` D. `6.02xx10^(23`
Description : In a compound of sulphur, the sulphur atom is in second excited state. The possible hybridisation of sulphur is
Last Answer : In a compound of sulphur, the sulphur atom is in second excited state. The possible hybridisation of sulphur is A. `sp^ ... sp^(3)` (or) `sp^(3)d^(2)`
Description : Assertion:- `SF_(6)` cannot be hydrolysed but `SF_(4)` can be. Reason:- Six F atoms in `SF_(6)` prevent the attack of `H_(2)O` on sulphur atom of `SF_
Last Answer : Assertion:- `SF_(6)` cannot be hydrolysed but `SF_(4)` can be. Reason:- Six F atoms in ` ... D. Statement-I is not correct and Statement-II is correct
Description : The side chain of which of the following amino acid contain sulphur atom? (A) Methionine (B) Threonine (C) Leucine (D) Tryptophan
Last Answer : Answer : A
Description : Total number of lone pair of electrons around oxygens in diethyl peroxide `is//are`
Last Answer : Total number of lone pair of electrons around oxygens in diethyl peroxide `is//are` A. 2 B. 3 C. 4 D. 0
Description : A person having osteoporosis is suffering from lead poisoning. Ethlene diamine tetra acetic acid (EDTA) is administered for this condition. The best f
Last Answer : A person having osteoporosis is suffering from lead poisoning. Ethlene diamine tetra acetic acid (EDTA ... C. disodium salt D. calcium dihydrogen salt
Description : What the prefix tetra- indicate three atoms?
Last Answer : Feel Free to Answer
Description : One of the main functions of Vitamin K is the cofactor for (A) Carboxylase for the formation of γ--carboxy glutamate (B) Methylation by S-adenosyl methionine (C) Carboxylation by biotin (D) One carbon transfer by tetra hydrofolate
Description : Reduction of D-ribonucleotides to D-deoxy ribonucleotides in prokaryotes requires (A) 5, 6 dimethyl benzimindazole cobamide (B) Thiredoxin (C) Tetra hydrobiopterin (D) Tetra hydrofolate VITAMINS 131
Description : Reduction of D-ribonucleotides to Ddeoxy ribonucleotides in prokaryotes requires (A) 5, 6 dimethyl benzimidazole cobamide (B) Thioredoxin (C) Tetra hydrobiopterin (D) Tetra hydrofolate
Last Answer : Answer : B
Description : Neogenesis of methyl group is (A) The availability of methyl group form δ adenosyl methionine (B) The availability of methyl group from betaine (C) Interaction between N5 N10 methylene tetra hydrofolate with a NAD+ dependent reductase (D) Availability of methyl group from methyl B12
Last Answer : Answer : C
Description : Tetra hydroglolate can be freed from N5 methyl tetrahydrofolate only by (A) Nor epinephrine (B) Ethanol amine (C) Nicotinamide (D) Vitamin B12
Last Answer : Answer : D