Description : Optical isomers are ------. a. Identical structures b. Not mirror images of each other c. Non super-imposable mirror images of each other. d. Super-imposable mirror images of each other
Last Answer : c. Non super-imposable mirror images of each other.
Description : A molecule is said to be chiral (a) if it contains plane of symmetry (b) if it contains centre of symmetry (c) if it cannot be superimposed on its mirror image (d) if it can be superimposed on its mirror image
Last Answer : if it cannot be superimposed on its mirror image
Description : Compounds with identical molecular formula but different structures are called - (1) Tetravalent compounds (2) Structural isomers (3) Covalent compounds (4) None of the above
Last Answer : (2) Structural isomers Explanation: Structures with identical molecular formula but different structures are called structural isomers. Eg: Butane.
Description : Isotopes of an element (a) Are physically identical to each other (b) Are chemically identical to each other (c) Are not identical to each other (d) Have the same mass numbers
Last Answer : Ans:(b)
Description : Which of the statements is correct about diastereomers? (a) They are stereoisomers that are not enantiomers. (b) They are a pair of identical isomers. (c) They are a pair of isomers that are mirror images. (d) All their asymmetric centers are the same.
Last Answer : They are stereoisomers that are not enantiomers
Description : Two compounds have the same composition and also have the same atoms attached to the same atoms, although with different orientations in space. These compounds are (a) Identical (b) Position isomers (c) Structural isomers (d) Stereoisomers
Last Answer : Stereoisomers
Description : The membranes of which domains are chemically the most similar? A- .Archaea and Bacteria B- Bacteria and Eukarya C- .Eukarya and Archaea D- membranes of all three domains are chemically identical
Last Answer : Bacteria and Eukarya
Description : What is superimposed mild levoscoliotic curvature of L5-S1?
Last Answer : Need answer
Description : A sewer running partially full and hurried with back filled, fails in compression due to A. Weight of the pipe B. Weight of the back fill C. Superimposed traffic loads D. All the above
Last Answer : ANS: D
Description : Another SEG function that allows a person to be superimposed on another scene. A. Visual effect B. Wiper C. Chroma keying D. Special effect generation
Last Answer : C. Chroma keying
Description : If harmonic motion of same frequency and same phase are superimposed in two perpendicular directions ( x and y) then, the resultant motion will be, A) circle B) An ellipse C) An square D) An rectangle
Last Answer : C) An square
Description : The superimposed load transmitted to the pipe, is generally evaluated by Business formula (A) pt = 3H 3P/2 (B) pt = 3H 3P/2 5 (C) pt = 3H 3P/2 2 (D) pt = 3H 3P 2 /2 3
Last Answer : (B) pt = 3H 3P/2 5 (C) pt = 3H 3P/2 2
Description : What is INCORRECT in HIV associated periodontitis:** A. Picture of ANUG superimposed with RPP B. Spontaneous bleeding interproximal C. Depression of T4/T8 lymphocytes D. Deep Perio-pockets usually seen in advanced periodontitis
Last Answer : C. Depression of T4/T8 lymphocytes
Description : When the incisive foramen is superimposed over the apex on a radiograph it may be mistaken to be a: A. Cyst B. Cementoma C. Odontoma
Last Answer : A. Cyst
Description : α-D-Glucose is different from β-D-glucose (a) in the configuration at C-1 (b) because they are mirror images of each other (c) because they are enantiomers (d) because they are geometrical isomers
Last Answer : in the configuration at C-1
Description : Immiscible liquids: w) are not mutually soluble x) dissolve in each other y) dissolve in more than one liquid z) are unstable and chemically react e) do not exist
Last Answer : ANSWER: W -- ARE NOT MUTUALLY SOLUBLE
Description : Water is not effective in extinguishing a fire caused by petrol because (1) the flame is too hot for water to cool it down (2) water and petrol react chemically (3) water and petrol are ... 4) water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
Last Answer : water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
Description : This amino acid cannot have optical isomers: (A) Alanine (B) Histidine (C) Threonine (D) Glycine
Last Answer : Answer : D
Description : A cationic complex has two isomers A & B. Each has one Co3+, five NH3 , one Br and one SO4 2 . A gives a white precipitate with BaCl2 solution while B gives a yellow precipitate with AgNO3 ... are the possible structures of the complexes A and B ? (a) Will the two complexes have same colour ?
Last Answer : (a) [CO (NH3 ) 5 Br] SO4 and [CO (NH3 ) 5 SO4 ] Br (b) NO
Description : A catalyst (A) Initiates a reaction (B) Lowers the activation energy of reacting molecules (C) Is capable of reacting with any one of the reactants (D) Cannot be recovered chemically unchanged at the end of a chemical reaction
Last Answer : (C) Is capable of reacting with any one of the reactants
Description : Pick out the correct statement. (A) In catalytic reactions, the catalyst reacts with the reactants (B) A catalyst initiates a chemical reaction (C) A catalyst lowers the activation energy of ... molecules (D) A catalyst cannot be recovered chemically unchanged at the end of the chemical reaction
Last Answer : (C) A catalyst lowers the activation energy of the reacting molecules
Description : Compounds with the same molecular formula but different structural formulas are called (a) Alkoxides (b) Iso compounds (c) Isomers (d) Ortho compounds
Last Answer : Isomers
Description : Which one of following pairs of compounds are functional isomers of each other
Last Answer : Which one of following pairs of compounds are functional isomers of each other A. `CH_(3)CH_(2)CH_(2)OH, CH_( ... CH_(2)CH_(2)OH, CH_(3)OCH_(2)CH_(3)`
Description : The essential amino acids (A) must be supplied in the diet because the organism has lost the capacity to aminate the corresponding ketoacids (B) must be supplied in the diet because the ... amino acids which cannot be synthesized by the organism at a rate adequate to meet metabolic requirements
Last Answer : Answer : B
Description : The essential amino acids (A) Must be supplied in the diet because the organism has lost the capacity to aminate the corresponding ketoacids (B) Must be supplied in the diet because the ... amino acids which cannot be synthesized by the organism at a rate adequate to meet metabolic requirements
Description : Which of the following statements is not true of fixed dose combination formulations: A. They are more convenient B. Contraindication to one of the components does not contraindicate the formulation ... adjusted D. The time course of action of the different components may not be identical
Last Answer : B. Contraindication to one of the components does not contraindicate the formulation
Description : You are given a set of scales and 12 marbles. The scales are of the old balance variety. That is, a small dish hangs from each end of a rod that is balanced in the middle. The device enables ... than the others. You are asked to both identify it and determine whether it is heavy or light -Riddles
Last Answer : Most people seem to think that the thing to do is weight six coins against six coins, but if you think about it, this would yield you no information concerning the whereabouts of the only different coin. ... . The heavier one is the different coin. If they balance, then 2 is a different light coin.
Description : Give reason: The two strands of DNA molecule are complementary to each other but are not identical.
Last Answer : The two strands of DNA are not identical because the nitrogenous bases are different in pairing. A purine base of one polynucleotide chain always pairs with a pyramidine base on the other. Adenine (A) pairs ... and Cytosine (C) pairs with Thymine (T). Hence the two strands of DNA are complementary.
Description : Radon differs from other naturally radioactive elements in which one of the following ways. Is it because radon w) is extremely radioactive x) decays into the element radium y) is a noble gas z) is as chemically active as fluorine
Last Answer : ANSWER: Y -- IS A NOBLE GAS
Description : Atoms of same element having different mass numbers are Called _______. (1) Isobars (2) Isotopes (3) (3)Isotones (4) (4) Isomers
Last Answer : (2) Isotopes Explanation: Atoms that have the same atomic number but different atomic masses are called isotopes. The difference in mass arises due to the atoms containing a different number of neutrons ... -14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively.
Description : Optical isomers that are not mirror images are called (a) Diastereomers (b) Enantiomers (c) Metamers (d) Meso compounds
Last Answer : Diastereomers
Description : Optical isomers that are mirror images are called : (a) Tautomers (b) Diastereomers (c) Enantiomers (d) Metamers
Last Answer : Enantiomers
Description : "Mirror-image" molecules are called: w) stereoisomers x) structural isomers y) diastereomers z) constitional isomers
Last Answer : ANSWER: W -- STEREOISOMERS
Description : How many geomatrical isomers are possible for each of the following complexes ? `(a) [Pt(NH_(3))_(2)(SCN)_(2)] " " (b) [CoCl_(2)Br_(2)]^(2-)("tetrahed
Last Answer : How many geomatrical isomers are possible for each of the following complexes ? `(a) [Pt(NH_(3))_(2)(SCN)_(2)] " " ... (+) " " (f) [Rh(en)_(3)]^(3+)`
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 : Arrange the three isomers of pentane in increasing order of their boiling points?
Last Answer : Ans.2, 2-Dimethylpropane
Description : Name two isomers of butanol? Which has higher boiling point?
Last Answer : Ans. n-butanol and 2-methyl propan-2-ol.Butanol has the higher boiling point as the branching increases the surface area of the molecule decreases so the boiling point decreases.
Description : How many isomers containing a benzene ring correspond to the formula C6H4(COOH)2? (a) 1 (b) 2 (c) 3 (d) 4
Last Answer : 3
Description : What is the term used for isomers that are in rapid equilibrium? (a) keto-enol tautomers (b) constitutional isomers (c) conformational isomers (d) cis-trans isomers
Last Answer : keto-enol tautomers
Description : Diethyl ether and methyl propyl ether are (a) Conformational isomers (b) Metamers (c) Geometrical isomers (d) Enantiomers
Last Answer : Metamers
Description : The number of structural isomers of alcohols with molecular formula C4H9OH is (a) 5 (b) 4 (c) 3 (d) 6
Last Answer : 4
Description : The number of structural isomers of alcohols with molecular formula C3H7OH is (a) 5 (b) 4 (c) 3 (d) 2
Last Answer : 2
Description : There are 8 isomers that have the molecular formula C5H11Br. How many of these are tertiary alkyl bromides? (a) 1 (b) 2 (c) 3 (d) 8
Last Answer : 1
Description : Why do trans isomers of alkenes have lower boiling points than cis isomers? (a) trans isomers have better symmetry (b) cis isomers have better symmetry (c) trans isomers are less polar (d) cis isomers are less polar
Last Answer : trans isomers are less polar
Description : How do the melting points of trans isomers compare to the cis isomers for alkenes? (a) cis isomers have higher melting points (b) trans isomers have higher melting points (c) both have similar melting points (d) no consistent trend is observed
Last Answer : trans isomers have higher melting points
Description : How many monochlorinated isomers would result from the reaction of chlorine with n-butane in the presence of UV light? (a) 2 (b) 4 (c) 6 (d) 8
Description : How many isomers are possible for heptane? (a) 9 (b) 10 (c) 11 (d) 12
Last Answer : 9
Description : How many isomers are possible for hexane? (a) 4 (b) 5 (c) 6 (d) 7
Last Answer : 5
Description : How many isomers are possible for pentane? (a) 2 (b) 3 (c) 4 (d) 5