Mutarotation refers to change in (A) pH (B) Optical rotation (C) Conductance (D) Chemical properties

Mutarotation refers to change in (A) pH (B) Optical rotation (C) Conductance (D) Chemical properties
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Which of the following statements best describes the meaning of “mutarotation”? (a) a rapid exchange between the α and β forms of diastereomeric sugars (b) a rapid exchange between the D and Lforms (c) a slow exchange between hydrogen and deuterated hydrogen (d) a slow change in optical rotation to reach an equilibrium value

Description : Which of the following statements best describes the meaning of mutarotation ? (a) a rapid exchange between the α and β forms of diastereomeric sugars (b) a rapid exchange between the D ... between hydrogen and deuterated hydrogen (d) a slow change in optical rotation to reach an equilibrium value

Last Answer : a slow change in optical rotation to reach an equilibrium value

α-D-glucose + 1120→ + 52.50 ← + 190 βD-glucose for glucose above represents (A) Optical isomerism (B) Mutarotation (C) Epimerisation (D) D and L isomerism

Description : α-D-glucose + 1120→ + 52.50 ← + 190 βD-glucose for glucose above represents (A) Optical isomerism (B) Mutarotation (C) Epimerisation (D) D and L isomerism

Last Answer : B

The mutarotation of glucose is characterized by : (a) a change from an aldehyde to ketone structure. (b) a change of specific rotation from a (+) to a (–) value. (c) the presence of an intramolecular bridge structure. (d) the irreversible change from α-D to the β-D form.

Description : The mutarotation of glucose is characterized by : (a) a change from an aldehyde to ketone structure. (b) a change of specific rotation from a (+) to a (–) value. (c) the presence of an intramolecular bridge structure. (d) the irreversible change from α-D to the β-D form.

Last Answer : the presence of an intramolecular bridge structure.

The pH of an amino acid depends (A) Optical rotation (B) Dissociation constant (C) Diffusion coefficient(D) Chain length

Description : The pH of an amino acid depends (A) Optical rotation (B) Dissociation constant (C) Diffusion coefficient(D) Chain length

Last Answer : Answer : B

What is the basis of mutarotation?

Description :  What is the basis of mutarotation?

Last Answer : It is due to the anomeric carbon atom.

Which of the following statements is false about glyceraldehyde? (a) Its IUPAC name is 1,2-dihydroxypropanal (b) It is isomeric with 1,3-dihydroxypropanone (c) It is optically active (d) It shows mutarotation

Description : Which of the following statements is false about glyceraldehyde? (a) Its IUPAC name is 1,2-dihydroxypropanal (b) It is isomeric with 1,3-dihydroxypropanone (c) It is optically active (d) It shows mutarotation

Last Answer : It shows mutarotation

Mutarotation is a term related to (a) Interconversion of anomers (b) Relationship of D- and L- families (c) Hydrolysis of sucrose (d) Number of monsaccharides in a carbohydrate

Description : Mutarotation is a term related to (a) Interconversion of anomers (b) Relationship of D- and L- families (c) Hydrolysis of sucrose (d) Number of monsaccharides in a carbohydrate

Last Answer : Interconversion of anomers

Which of the following statements is false about α-D-glucose? (a) it has a pyranose ring. (b) it is a hemiacetal. (c) it shows mutarotation. (d) it is the purest form of table sugar.

Description : Which of the following statements is false about α-D-glucose? (a) it has a pyranose ring. (b) it is a hemiacetal. (c) it shows mutarotation. (d) it is the purest form of table sugar.

Last Answer : it is the purest form of table sugar.

Which of the following is true about sucrose? (a) It hydrolyzes to fructose and glucose. (b) It is a reducing sugar. (c) It is a monosaccharide. (d) It undergoes mutarotation in water.

Description : Which of the following is true about sucrose? (a) It hydrolyzes to fructose and glucose. (b) It is a reducing sugar. (c) It is a monosaccharide. (d) It undergoes mutarotation in water.

Last Answer : It hydrolyzes to fructose and glucose.

Pick out the wrong statement. (A) Catalytic activity of enzyme catalysed reactions which is affected by temperature, pH value & chemical agents, is maximum at a temperature of about 45°C(B) Most of the enzyme catalysed reactions involve at least two substrates (C) Enzymes help in increasing the activation energy of the reaction (D) Equilibrium concentrations in enzyme catalysed reactions can be calculated by using the thermodynamic properties of substrates & prod

Description : Pick out the wrong statement. (A) Catalytic activity of enzyme catalysed reactions which is affected by temperature, pH value & chemical agents, is maximum at a temperature of about 45°C ... in enzyme catalysed reactions can be calculated by using the thermodynamic properties of substrates & prod

Last Answer : (C) Enzymes help in increasing the activation energy of the reaction

The instrument which can be used to measure optical activity, i.e., specific rotation:

Description : The instrument which can be used to measure optical activity, i.e., specific rotation:

Last Answer : The instrument which can be used to measure optical activity, i.e., specific rotation: A. Refractometer B. Photometer C. Voltmeter D. Polarimeter

Fibre optics work on the principle of – (1) Scattering of light (2) Total internal absorption (3) Total internal reflection (4) Optical rotation

Description : Fibre optics work on the principle of – (1) Scattering of light (2) Total internal absorption (3) Total internal reflection (4) Optical rotation

Last Answer : (3) Total internal reflection Explanation: An optical fiber (or optical fibre) is a flexible, transparent fiber made of glass (silica) or plastic, slightly thicker than a human hair. It ... science and engineering concerned with the design and application of optical fibers is known as fiber optics.

Fibre optics work on the principle of (1) scattering of light (2) total internal absorption (3) total internal reflection (4) optical rotation

Description : Fibre optics work on the principle of (1) scattering of light (2) total internal absorption (3) total internal reflection (4) optical rotation

Last Answer :  total internal reflection

Crop rotation refers to : (a) method of farming without irrigation in an area of limited rainfall (b) farming done on the same land by different people turn-wise (c) growing same crop in alternate years (d) growing different crops in succession

Description : Crop rotation refers to : (a) method of farming without irrigation in an area of limited rainfall (b) farming done on the same land by different people turn-wise (c) growing same crop in alternate years (d) growing different crops in succession

Last Answer : Ans: (d)

Which is not true about inorganic catalysts and enzymes? (A) They are specific (B) Inorganic catalysts require specific not needed by enzymes (C) They are sensitive to pH (D) They speed up the rate of chemical reaction

Description : Which is not true about inorganic catalysts and enzymes? (A) They are specific (B) Inorganic catalysts require specific not needed by enzymes (C) They are sensitive to pH (D) They speed up the rate of chemical reaction

Last Answer : Answer : B

PH is the negative logarithm of the hydrogen Ion Concentration express4ed in moles/liter of aqueous solution. PH of buffer solution is calculated by. Henderson’s equation Name the best indicator Phenolphthalein, PH range 8.3 to 10.0 Chemical kinetics deals with study of. Rates and mechanisms of chemical and Biochemical reactions

Description : PH is the negative logarithm of the hydrogen Ion Concentration express4ed in moles/liter of aqueous solution. PH of buffer solution is calculated by. Henderson's equation Name the best ... Chemical kinetics deals with study of. Rates and mechanisms of chemical and Biochemical reactions

Last Answer : What does Thermodynamics helps in predicting ?

What are some of the properties of optical fibre?

Description : What are some of the properties of optical fibre?

Last Answer : It's not brittle,but it's not tough or strong either.It's thin and it's subjected to breakage which is known as fibre cut in technical terms.They are used in communication process to ... engineering with respect to design and afety parameters.Moreover, it gives a very ugly look to the surroundings.

Lane and Garton classification of petroleum is based on its (A) Composition (B) Specific gravity (C) Optical properties (D) Viscosity

Description : Lane and Garton classification of petroleum is based on its (A) Composition (B) Specific gravity (C) Optical properties (D) Viscosity

Last Answer : (B) Specific gravity

Quality fiber-end preparation is essential for proper system operation. What properties must an optical fiber-end face have to ensure proper fiber connection?

Description : Quality fiber-end preparation is essential for proper system operation. What properties must an optical fiber-end face have to ensure proper fiber connection?

Last Answer : Be flat, smooth, and perpendicular to the fiber axis.

The amount of backscattered optical power at each point depends on what two properties?

Description : The amount of backscattered optical power at each point depends on what two properties?

Last Answer : Forward optical power and backscatter capture coefficient.

Optically active compounds are capable of (A) Different reactions (B) Rotating plane of polarized light (C) Showing same chemical properties (D) None of these

Description : Optically active compounds are capable of (A) Different reactions (B) Rotating plane of polarized light (C) Showing same chemical properties (D) None of these

Last Answer : Answer : B

The chemical reaction at one time the rate of forward and backward reaction becomes equal that state is called Equilibrium state. In a chemical equilibrium, the following properties remain unchanged with time. Pressure, Temperature, density, color Pressure, Temperature, density, color

Description : The chemical reaction at one time the rate of forward and backward reaction becomes equal that state is called Equilibrium state. In a chemical equilibrium, the following properties remain unchanged with time. Pressure, Temperature, density, color Pressure, Temperature, density, color

Last Answer : Who proposed law of mass action ?

Boiler water pH refers to a quantitative figure that expresses the acidity or alkalinity of boiler water. Ideally it should be between • 8.5 to 9.5 • 7.5 to 8.5 • 9.5 to 10.5

Description : Boiler water pH refers to a quantitative figure that expresses the acidity or alkalinity of boiler water. Ideally it should be between • 8.5 to 9.5 • 7.5 to 8.5 • 9.5 to 10.5

Last Answer : • 8.5 to 9.5

Out of boiling point (I), entropy (II), `pH` (III) and `e.m.f` of a cell (IV), intensive properties are:

Description : Out of boiling point (I), entropy (II), `pH` (III) and `e.m.f` of a cell (IV), intensive properties are:

Last Answer : Out of boiling point (I), entropy (II), `pH` (III) and `e.m.f` of a cell (IV), intensive properties are: A ... B. I, II C. I, II, III D. All of these

Purity of water can be assessed by determining one of its following properties instrumentally : (A) pH (B) Refractivity (C) Viscosity (D) Conductivity

Description : Purity of water can be assessed by determining one of its following properties instrumentally : (A) pH (B) Refractivity (C) Viscosity (D) Conductivity

Last Answer : (D)Conductivity

How do I work out the area or length of a wire when I only know the resistance/conductance and the length/area?

Description : How do I work out the area or length of a wire when I only know the resistance/conductance and the length/area?

Last Answer : if cunductance = conductivity x area/length then length = conductivity / conductance x Area i think, if the equation is transposed correctly, it’s been a while since school maths. better check that one though.

Calculate the best estimate for the conductance G?

Description : Calculate the best estimate for the conductance G?

Last Answer : Could the student ask the teacher?

How to work out the conductance of a wire?

Description : How to work out the conductance of a wire?

Last Answer : I know ½000 is the right answer but I want it to say 0.0005

What is Conductance ?

Description : What is Conductance ?

Last Answer : The horizontal component of current per unit volt of an AC circuit is called conductance. It is expressed by " G" and its single inflection is " ω" or semen.

How is electrolytic conductance measured experimentally?

Description : How is electrolytic conductance measured experimentally?

Last Answer : Electrolyte conductance can be measured by putting anode and cathode on it and measured the external voltage. Then compared the same with some standard known electrolyte solution. Also, specific ... charge discharge method. So by calculating with inbuilt software we can easily get the conductance.

Of the interhalogen compounds, `CIF_3` is more reactive than `BrF_3` , but `BrF_3` has higher conductance in the liquid state. The reason is that

Description : Of the interhalogen compounds, `CIF_3` is more reactive than `BrF_3` , but `BrF_3` has higher conductance in the liquid state. The reason is that

Last Answer : Of the interhalogen compounds, `CIF_3` is more reactive than `BrF_3` , but `BrF_3` has higher ... -` more easily D. `CIF_3` is most reactive

Which of the following shows maximum molar conductance ?

Description : Which of the following shows maximum molar conductance ?

Last Answer : Which of the following shows maximum molar conductance ? A. `[Co(NH_(3))_(6)]Cl_(3)` B. `[Co(NH_(3))_(3)Cl_( ... (2)]Cl` D. `[Co(NH_(3))_(5)Cl]Cl_(2)`

During electrolytic reduction of alumina , two auxiliary electrolytes X and Y are added to increase the electrical conductance and lower the temperatu

Description : During electrolytic reduction of alumina , two auxiliary electrolytes X and Y are added to increase the electrical conductance and lower the temperatu

Last Answer : During electrolytic reduction of alumina , two auxiliary electrolytes X and Y are added to increase ... . alum and flourspar D. flourspar and bauxite

a2–adrenergic receptors are associated with following except (a) Increase in phospholipase C activity (b) Increase in potassium channel conductance (c) Decrease in calcium channel conductance (d) Increase in adenylyl cyclase activity

Description : a2–adrenergic receptors are associated with following except (a) Increase in phospholipase C activity (b) Increase in potassium channel conductance (c) Decrease in calcium channel conductance (d) Increase in adenylyl cyclase activity

Last Answer : Ans: D

The leakage current in the transmission lines is referred to as the a) Resistance b) Radiation c) Conductance d) Polarisation

Description : The leakage current in the transmission lines is referred to as the a) Resistance b) Radiation c) Conductance d) Polarisation

Last Answer : Ans: C

Which of the following parameters is not a primary parameter? a) Resistance b) Attenuation constant c) Capacitance d) Conductance

Description : Which of the following parameters is not a primary parameter? a) Resistance b) Attenuation constant c) Capacitance d) Conductance

Last Answer : Ans: B

'Farad' is the unit of : (1) Capacitance (2) Inductance (3) Resistance (4) Conductance

Description : 'Farad' is the unit of : (1) Capacitance (2) Inductance (3) Resistance (4) Conductance

Last Answer : (1) Capacitance Explanation: The Farad is the SI derived unit of capacitance. It is named after the English physicist Michael Faraday.

Safety fuse wire used in domestic electrical appliances is made of metal of low (1) Resistance (2) Melting point (3) Specific gravity (4) Conductance

Description : Safety fuse wire used in domestic electrical appliances is made of metal of low (1) Resistance (2) Melting point (3) Specific gravity (4) Conductance

Last Answer : (2) Melting point Explanation: The fuse wire is based on the Joules law of heating which says that when the electric current is allowed to pass through a conductor, the conductor heats up and is ... . For this purpose the material used as fuse wire should have high resistance and low melting point.

Which physical quantity is measured in ‘siemens’? (1) Electric potential (2) Electrical conductance (3) Magnetic flux (4) Refractive index

Description : Which physical quantity is measured in ‘siemens’? (1) Electric potential (2) Electrical conductance (3) Magnetic flux (4) Refractive index

Last Answer : (2) Electrical conductance Explanation: The Siemens is the unit of electric conductance, electric susceptance and electric admittance in the International System of Units (SI).

Most conducting materials such as copper, aluminum, iron, nickel, and tungsten _____________. A. increase in resistance with increased temperature B. increase in resistance with decreased temperature C. decrease in resistance with increased temperature D. increase in conductance with increased temperature

Description : Most conducting materials such as copper, aluminum, iron, nickel, and tungsten _____________. A. increase in resistance with increased temperature B. increase in resistance with decreased ... C. decrease in resistance with increased temperature D. increase in conductance with increased temperature

Last Answer : Answer: A

What do you call the electrical conduction in a photosensitive material which is not exposed to radiation? A. Dark conductance B. Pure conductance C. Black out D. Super conductance

Description : What do you call the electrical conduction in a photosensitive material which is not exposed to radiation? A. Dark conductance B. Pure conductance C. Black out D. Super conductance

Last Answer : A. Dark conductance

In transmission line, which of the following is the first step in the procedure of using stub matching? A. Calculate stub susceptance. B. Calculate load admittance C. Connect stub to load D. Transform conductance to resistance

Description : In transmission line, which of the following is the first step in the procedure of using stub matching? A. Calculate stub susceptance. B. Calculate load admittance C. Connect stub to load D. Transform conductance to resistance

Last Answer : B. Calculate load admittance

Determine the conductance of a two-wire open line with the following parameters: D = 4 in., d = 0.1 in. and ρ = 2.6x108 Ω-m. A. 2.76x10-9 S/m B. 2.76x10-6 S/m C. 2.76x10-12 S/m D. 2.76x10-3 S/m

Description : Determine the conductance of a two-wire open line with the following parameters: D = 4 in., d = 0.1 in. and ρ = 2.6x108 Ω-m. A. 2.76x10-9 S/m B. 2.76x10-6 S/m C. 2.76x10-12 S/m D. 2.76x10-3 S/m

Last Answer : A. 2.76x10-9 S/m

Which solution will allow greater conductance of electricity, 1 M NaCl at 293 K or 1 M NaCl at 323 K and why ?

Description : Which solution will allow greater conductance of electricity, 1 M NaCl at 293 K or 1 M NaCl at 323 K and why ?

Last Answer : Ans. 1 M NaCl at 323 K as the ionic mobilities increase with increase in temperature. 

The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) (A) ∝ t (B) ∝ 1/t (C) ∝ √t (D) Independent of 't

Description : The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) (A) ∝ t (B) ∝ 1/t (C) ∝ √t (D) Independent of 't

Last Answer : (B) ∝ 1/t

Pick out the wrong statement. (A) Reciprocal of the resistance to heat flow is called thermal conductance (B) Unit of thermal conductance is W/°K (C) Thermal conductance of a wall of thickness 'L', thermal conductivity 'k' and heat flow area 'A' is kL/A (D) None of these

Description : Pick out the wrong statement. (A) Reciprocal of the resistance to heat flow is called thermal conductance (B) Unit of thermal conductance is W/°K (C) Thermal conductance of a wall of thickness 'L', thermal conductivity 'k' and heat flow area 'A' is kL/A (D) None of these

Last Answer : (C) Thermal conductance of a wall of thickness 'L', thermal conductivity 'k' and heat flow area 'A' is kL/A

The film thickness for laminar film condensation on vertical surface __________ from top to bottom. (A) Cumulatively increases (B) Cumulatively decreases (C) Remain constant (D) And the surface conductance increase

Description : The film thickness for laminar film condensation on vertical surface __________ from top to bottom. (A) Cumulatively increases (B) Cumulatively decreases (C) Remain constant (D) And the surface conductance increase

Last Answer : (A) Cumulatively increases

Siemens is the unit of---------? A. Electrical Conductance (Answer) B. Magnetic Conductance C. Electrical Capacitance D. Magnetic Capacitance

Description : Siemens is the unit of---------? A. Electrical Conductance (Answer) B. Magnetic Conductance C. Electrical Capacitance D. Magnetic Capacitance

Last Answer : A. Electrical Conductance (Answer)

What is conductance?

Description : What is conductance?  

Last Answer : Conductance is the property of the conductor, which allows the flow of electric current through it. Conductance is denoted by the letter G and is reciprocal of resistance. The unit of conductance is mho. A substance, which posses conductance as its major property can be called as a good conductor.

The unit of conductance in SI unit is (A) W/m (B) W/m2 (C) W/°K (D) W/m°K

Description : The unit of conductance in SI unit is (A) W/m (B) W/m2 (C) W/°K (D) W/m°K

Last Answer : (C) W/°K