Description : In a solution having a pH of 7.4, the hydrogen ion concentration is (A) 7.4 nmol/L (B) 40 nmol/L (C) 56 nmol/L (D) 80 nmol/L
Last Answer : Answer : B
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 ?
Description : An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall". This is the working principle of a (A) pH meter (B) Polarimeter (C) Chromatograph (D) Polarograph
Last Answer : (A) pH meter
Description : Pick up the incorrect statement from the following: (A) The pH value of water indicates the logarithm of reciprocal of hydrogen ion concentration in water (B) Higher value of pH ... value of pH means higher hydrogen ion contraction (D) Lower value of pH gives alkaline solution
Last Answer : (D) Lower value of pH gives alkaline solution
Description : The concentraction of hydrogen ion (H+ )is denoted by pH.How do you denote concentration of hydrogen ion(OH)?
Last Answer : Ans:The concentration of hydrogen ion (OH) is denoted by poH.
Description : pH is defined as the negative logarithm of the hydrogen ion concentration. Comparing a pH 5 and a pH 8 solution, which of the following is true? w) There are 1,000 times more hydrogen ions in ... . z) Cannot tell the difference between these two solutions by pH, since the numbers are so close.
Last Answer : ANSWER: X -- THERE ARE 1,000 TIMES MORE HYDROGEN IONS IN THE PH 5 SOLUTION
Description : What is a chemical system that prevents changes in hydrogen ion concentration?
Last Answer : This is called a buffer system. It resists changes in [H+]concentration, which is the same as saying it resists changes inpH.
Description : Compared with intracellular fluid, extracellular fluid has, a. a greater osmolarity b. a higher protein concentration c. a lower chloride ion concentration d. a lower hydrogen ion concentration
Last Answer : a lower hydrogen ion concentration
Description : Hydrogen ion concentration in distilled water is (A) 10 -7 (B) 7 × 10 -7 (C) 10 7 (D) 7 × 10 7
Last Answer : (A) 10 -7
Description : The pulmonary ventilation frequency (number of inhalations per time unit) rises or lowers the carbon dioxide concentration in blood. If it is intense the gas is more eliminated to the exterior and if it ... carbon dioxide and also of more hydrogen ions spending and the pH of the solution is raised.
Last Answer : What are acidosis and alkalosis?
Description : The oxygen d issoc iat ion curve for hemoglobin is shifted to the right by (A) Decreased O2 tension (B) Decreased CO2 tension (C) Increased CO2 tension (D) Increased pH
Last Answer : Answer : C
Description : The following technique makes use of the difference in net charges of proteins at a given pH: (A) Thin layer chromatography (B) Ion exchange chromatography (C) High performance liquid chromatography (D) Paper chromatography
Description : In which the following factors can interfere in binding of `O_(2)` with haemoglobin. `A-P_(CO_(2))` `B-H^(+)` ion concentration C-Temperture
Last Answer : In which the following factors can interfere in binding of `O_(2)` with haemoglobin. `A-P_(CO_(2))` `B-H^(+)` ion ... A B. B,C C. A and C D. A,B,C
Description : What concentration of `Ag^(+)` ions will be in equilibrium with a saturated solution containing a precipitate of `Ag_(2)CrO_(4) and CrO_(4)`-ion conce
Last Answer : What concentration of `Ag^(+)` ions will be in equilibrium with a saturated solution containing a precipitate of ... D. `5.9xx10^(-6)` moles per litre
Description : Chemoreceptors for `CO_(2)` and `H^(+)` ion concentration are present in :-
Last Answer : Chemoreceptors for `CO_(2)` and `H^(+)` ion concentration are present in :- A. Arteries and ... and veins and medulla D. Vein and pons and medulla
Description : Any mineral ion concentration in tissues that reduces the dry weight of tissues by about 10% known as
Last Answer : Any mineral ion concentration in tissues that reduces the dry weight of tissues by about 10% known as
Description : Which ion increases in concentration when a strong is base added to water?
Last Answer : Hydroxide ion (OH-)
Description : The negative logarithm of H+ ion concentration
Last Answer : Ans. Soil pH
Description : Which ion is found in greater concentration inside the cell a. K b. Na c. Cl d. HCO3
Last Answer : K
Description : Which ion is found in greater concentration outside the cell a. K b. Na c. Cl d. HCO3
Last Answer : Na
Description : The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the (A) Bacterial stability factor (B) Relative stability (C) Biological oxygen demand (BOD) (D) Oxygen ion concentration
Last Answer : (B) Relative stability
Description : The following is true of 'new formula' WHO-ORS: A. It has Na+ ion concentration of 75 mM/L B. Its glucose concentration is 75 mM/L C. Its total osmolarity is 245 mOsm/L D. All of the above are correct
Last Answer : D. All of the above are correct
Description : The 'new formula' WHO-ORS differs from the older 'standard formula' WHO-ORS in the following respect(s): A. It has lower Na+ ion and glucose concentration B. It has higher K+ ion concentration C. It has no basic salt D. Both 'B' and 'C' are correct
Last Answer : A. It has lower Na+ ion and glucose concentration
Description : hat is/are the consequence(s) of myocardial Na+ K+ ATPase inhibition by digoxin: A. Increased intracellular Na+ ion concentration B. Increased cytosolic Ca2+ ion concentration C. Increased intracellular K+ ion concentration D. Both ‘A’ and ‘B’ are correct
Last Answer : D. Both ‘A’ and ‘B’ are correct
Description : A gas of hydrogen - like ion is perpendicular in such a way that ions are only in the ground state and the first excite state. A monochromatic light o
Last Answer : A gas of hydrogen - like ion is perpendicular in such a way that ions are only in the ... Calculate the values of the maximum and minimum wavelengths.
Description : What hydrogen-like ion has the wavelength difference between the first lines of the Balmer Lyman series equal to `59.3nm`?
Last Answer : What hydrogen-like ion has the wavelength difference between the first lines of the Balmer Lyman series equal to `59.3nm`?
Description : What is another word used to describe a hydrogen ion?
Last Answer : Need answer
Description : What will most likely happen is a toxin causes the hydrogen ion pump to stop moving h plus ions outside the mitochondrial membranes of the bird's cells?
Description : In a hydrogen ion pump the energy is used to join small molecules together to make larger ones which factor most likely has the greatest effect on the number of molecules mitochondria can produced?
Last Answer : the amount of energy the flowing H+ ions have
Description : There are two properties of the cell necessary to maintain nonequilibrium cellular composition; the first is selectivity and the second is energy conversion. Which of the following statement(s ... transported via secondary active transport include hydrogen ions, calcium, amino acids and glucose
Last Answer : Answer: c, d The selectivity of the plasma membrane, although impressive, cannot account for the nonequilibrium composition of living cells. A cell can be maintained in a nonequilibrium state only by ... to drive the transport of a second species such as protons, calcium, amino acids, or glucose
Description : Name the hydrogen ion which resembles anions of group 17.
Last Answer : A (H-) Hydride ion
Description : Give one example for each of the following types of inter-particle forces (a) London dispersion forces (b)Dipole-Dipole forces (c) Hydrogen bond (d) Ion-dipole forces
Last Answer : Ans. (a) noble gases. (b) between HCl molecules. (c) Between water molecules or HF molecules. (d)Between NO3- and water molecules.
Description : Which of the following is true when HCL is passed through water. (i) It does not ionize in the solution as it is a covalent compound (ii) It ionizes in the solution (iii) It gives both hydrogen and hydroxyl ions in the solution ... ) (i) only (b) (iii) only (c) (ii) and (iv) only (d) (iii) and (iv)
Last Answer : (c) (ii) and (iv) only
Description : Human urine is usually acidic because (a) potassium and sodium exchange generates acidity (b) hydrogen ions are actively secreted into the filtrate (c) the sodium transporter exchanges one hydrogen ion for each sodium ion, in peritubular capillaries (d) excreted plasma proteins are acidic.
Last Answer : (b) hydrogen ions are actively secreted into the filtrate
Description : Which of the following is not a correct statement concerning the FriedelCrafts acylation of benzene? (a) An alkyl group substitutes for a hydrogen. (b) The benzene ring attacks an acylium ion. (c) The acylium ion is resonance stabilized. (d) The acylium ion is often produced from an acyl chloride.
Last Answer : An alkyl group substitutes for a hydrogen
Description : Which of the following statements describes the first step in the mechanism of the aldol condensation? (a) An alpha hydrogen is abstracted by the base to form an enolate anion. (b) A nucleophilic base attacks ... by the base ion. (d) The alpha hydrogen is abstracted by an acid to the enolate anion.
Last Answer : An alpha hydrogen is abstracted by the base to form an enolate anion
Description : What is the strongest intermolecular force present in liquid ethanol? (a) induced dipole-induced dipole (b) dipole-dipole, specifically hydrogen bonding (c) dipole-dipole, but not hydrogen bonding (d) ion-dipole
Last Answer : dipole-dipole, specifically hydrogen bonding
Description : Chlorine free radicals react with methane by : (a) donating their free-radical electron to methane to form chloromethane. (b) abstracting a hydrogen atom from methane, and producing ... produce chloromethane. (d) forming a carbonium ion intermediate that rapidly dissociates to form chloromethane
Last Answer : abstracting a hydrogen atom from methane, and producing HCl and a methyl radical
Description : In an alkyl halide substitution of hydrogen by deuterium results in slow formation of ion pair. This is known as? a. Ortho effect b. Mesomeric effect c. Secondary kinetic isotope effect d. Primary kinetic isotope effect
Last Answer : c. Secondary kinetic isotope effect
Description : Which force is most important in allowing ammonia, NH3, to dissolve in water? A hydrogen bonding B dipole-induced dipole C ion-dipole D dipole-dipole E ionic
Last Answer : A hydrogen bonding
Description : The boiling points of the halogens increase going from F2 to I2. What type of intermolecular forces are responsible for this trend? w) permanent dipole x) hydrogen bonding y) ion-ion attraction z) London dispersion forces
Last Answer : ANSWER: Z -- LONDON DISPERSION FORCES
Description : Which of the following molecules or ions is NOT formed when K metal reacts with liquid CH3OH? Is it: w) potassium ion x) hydrogen ion y) methoxy ion z) hydrogen molecule
Last Answer : ANSWER: X -- HYDROGEN ION
Description : Gastric enzyme pepsin acts only in acidic medium with in a limited pH concentration. It varies `:`
Last Answer : Gastric enzyme pepsin acts only in acidic medium with in a limited pH concentration. It varies `:` A. 1.20 to 1.80 ... C. 2.00 to 2.50 D. 1.50 to 2.60
Description : The Michaelis constant, Km is (A) Numerically equal to ½ Vmax (B) Dependent on the enzyme concentration (C) Independent of pH (D) Numerically equal to the substrate concentration that gives half maximal velocity
Last Answer : Answer : D
Description : Enzymes activity is controlled by (A) pH of the solution (B) Temperature (C) Concentration of the enzyme (D) Concentration of the substrate (E) All of these
Description : Velocity maximum for an enzyme at half the substrate concentration gives (A) The molecular weight of the enzyme (B) Km value (C) Isoelectric pH (D) Pk value
Description : In enzyme assays, all the following are kept constant except (A) Substrate concentration (B) Enzyme concentration (C) pH (D) Temperature
Description : Factors affecting enzyme activity: (A) Concentration (B) pH (C) Temperature (D) All of these
Description : Which of the following concerning the pH of urine is correct? 1) is a useful indicator of the acid/base balance of the blood 2) rises on a vegetarian diet 3) is determined by the concentration of ... lower than 5.5 in renal tubular acidosis 5) would be above 7.0 after prolonged and severe vomiting
Last Answer : Answers-2 c - excretion of ammonium occurs when an acid urine is produced but the pH of urine is of course determined by the concentration of H+ ions d-unable to lower the pH to ... and distal nephron and this perpetuates the metabolic alkalosis until the fluid balance is restored with IV fluids.
Description : The tear film: a. has a higher pH than the serum b. has a lower concentration of glucose than the serum c. the oily component is secreted by the meibomian glands d. all above
Last Answer : all above