Description : A solution with a pH of 12 is: w) weakly acidic x) strongly acidic y) weakly basic z) strongly basic
Last Answer : ANSWER: Z -- STRONGLY BASIC
Description : A sample of grapefruit juice at 25 degrees Celsius has a hydronium concentration of 1.78 X 10-3 molar. What is the pH of the solution? w) 2.22 x) 2.75 y) 3.25 z) 6.33
Last Answer : ANSWER: X -- 2.75
Description : Peroxides such as hydrogen peroxide and benzoyl peroxide are commonly used in small quantities in over-the-counter preparations such as antiseptics and acne creams. What hazard do peroxides present in higher concentrations? w) explosive x) strongly acidic y) strongly basic z) there is no hazard
Last Answer : ANSWER: W -- EXPLOSIVE
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 : Relative to the pure solvent, the boiling point of a solution is: w) higher x) lower y) at the same temperature
Last Answer : ANSWER: W -- HIGHER
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 concentration of (H+) ions is 4 x 10-5in a solution. Then pH of the solution will be (Given log 4 = 0.6) (A) 4.4 (B) 5.6 (C) 8.4 (D) 2.4
Last Answer : (A) 4.4
Description : What are the major constituents of typical fly ash particles generated from the combustion of coal? w) acidic and basic oxides x) trace elements y) unburned carbon z) sulfates and phosphates
Last Answer : ANSWER: W -- ACIDIC AND BASIC OXIDES
Description : Acids react with bases to form which of the following? Do they form: w) salt and acidic anhydride x) water and basic anhydride y) basic anhydride and salt z) salt and water
Last Answer : ANSWER: D -- SALT AND WATER
Description : pH value between 6.5-7.5 makes the soil (1) Basic (2) Neutral (3) Acidic (4) None of these
Last Answer : None of these
Description : HCl is dissolved in solvent A; the solution is non-conducting towards an electric current. Solvent A must be: w) polar x) non-polar y) organic z) more acidic than HCl
Last Answer : ANSWER: X -- NON-POLAR
Description : What is the pH of an aqueous solution of 0.1 molar HCl? w) 7 x) 13 y) 1 z) 3
Last Answer : ANSWER: Y -- 1
Description : How is the acidic , basic character of acids and bases varies with respect to neutral water . Show these variations on the PH scale.
Last Answer : Ans: The PH of neutral water is 7 ,As the PH of solution deceases from 7 the acid characteristic of the solution increase so the acids having values 1 and 2 are strong acids and when the ... 7 the basic characteristic of the solution increase so the acids having values 11and 12 are strong bases.
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
Description : Several approaches have been suggested to increase the fixation of professionally applied topical fluoride, which of the following statements IS INCORRECT regarding increasing the fixation? A. Increase concentration of ... with 0.5% phosphoric acid E. Use NH4F rather than NaF at a lower PH
Last Answer : B. Raise the PH of the fluoride solution
Description : Which of the following is correct for an amino acid solution when it is in the acidic form? (a) pH > pKa (b) pH < pKa (c) zwitterionic (d) pH = 7
Last Answer : pH < pKa
Description : Which of the statements is not true? (1) K2Cr2O7 solution becomes yellow on increasing the pH beyond 7 (2) On passing H2 S through acidified K2Cr2O7 solution, a milky colour is observed (3) Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis (4) K2Cr2O7 solution in acidic medium is orange
Last Answer : Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis
Description : Solution A has a pH of 2 while solution B has a pH o 7. How many times more acidic is solution A than Solution B?
Last Answer : ANSWER: ONE HUNDRED THOUSAND or TEN TO THE FIFTH POWER
Description : What is the pH of a solution that is 1000 times more acidic than pure water?
Last Answer : ANSWER: 4
Description : An aqueous solution whose concentration effectivel matches the concentration of blood is said to be: w) isotopic x) isobaric y) isotonic z) isoelectronic
Last Answer : ANSWER: Y -- ISOTONIC
Description : The rate at which dissolution occurs is LEAST dependent upon which one of the following factors: w) temperature x) pressure y) solution concentration z) solute surface area
Last Answer : ANSWER: X -- PRESSURE
Description : Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution (A) A1is more alkaline than solution A2 (B) A1is highly acidic (C) A2is very slightly acidic (D) Both (B) & (C)
Last Answer : (D) Both (B) & (C)
Description : Which of the following pairs of compounds could NOT be used to create a buffer solution? Would it be: w) HCL and NaCl (read: H - C - L and N - A - C - L) x) HCN and NaCN (read: H - C - N and N - A - C - N) y) NH3 ... - H - 4 - C - L) z) HNO2 and NaNO2 (read: H - N - O -2 and N - A - N - O - 2)
Last Answer : ANSWER: W -- HCL AND NaCl (read: H - C - L and N - A - C - L)
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 : When a solute is dissolved in a pure solvent, the resulting freezing point is: w) higher than pure solvent x) lower than pure solvent y) does not change z) cannot tell from this information
Last Answer : ANSWER: X -- LOWER THAN PURE SOLVENT
Description : Compared to Chlorine, Bromine has: w) smaller atomic size x) higher density y) lower boiling point z) greater number of outer electrons
Last Answer : ANSWER: X -- HIGHER DENSITY
Description : .Which of the following statements is correct about an aqueous solution of an acid and of a base? (i) Higher the pH, stronger the acid (ii) Higher the pH, weaker the acid (iii) Lower the pH, stronger the base (iv) Lower the pH, ... (i) and (iii) (b) (ii) and (iii (c) (i) and (iv) (d) (ii) and (iv)
Last Answer : (d) (ii) and (iv)
Description : Omeprazole exerts practically no other action except inhibition of gastric acid secretion because: A. It transforms into the active cationic forms only in the acidic pH of the gastric juice B. Its ... forms are unable to diffuse out from the gastric parietal cell canaliculi D. All of the above
Last Answer : D. All of the above
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 : Which of the following properties is lower for a solution than for the pure solvent? w) osmotic pressure x) vapor pressure y) temperature z) boiling point
Last Answer : ANSWER: X -- VAPOR PRESSURE
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 : Maximum enzyme activity is observed at (A) Acidic pH (B) Neutral pH (C) Basic pH (D) Optimum pH
Last Answer : Answer : D
Description : A rainfall may be classified as acidic if its pH value is less or equal to A. 6 B. 7 C. 5 D. 6.5
Last Answer : ANS: C
Description : Osmosis is the flow of solution from higher concentration to a solution of lower concentration through whw $$Etlcakenancable membrane. What is incorrect in this state- ment?
Last Answer : The flow of solution is not possible through semi permeable membrane
Description : Which of the following would be most acidic? w) phenol x) methanol y) acetic acid z) methyl amine
Last Answer : ANSWER: C -- ACETIC ACID
Description : Members of which of the following classes of compounds generally produce acidic solutions when dissolved in water? w) metal oxides x) nonmetal oxides y) alcohols z) aldehydes
Last Answer : ANSWER: X -- NONMETAL OXIDES
Description : Which of the following elements would form an acid oxide with the formula XO2 and an acidic compound with hydrogen with the formula XH2? w) Sodium x) Magnesium y) Aluminum z) Sulfur
Last Answer : ANSWER: Z -- SULFUR
Description : which. orange juice is a solution that contains citric acid, which gives orange juice an approximate pH of 3.5. Which substance is more acidic than orange juice?
Last Answer : battery acid with a pH of 0.8
Description : Relative lowering of vapour pressure is a colligative property because_____________. (a)It depends on the concentration of a non electrolyte solute in solution and does not depend on the nature of ... of an electrolyte or nonelectrolyte solutein solution as well as on the nature of solute molecules.
Last Answer : (a)It depends on the concentration of a non electrolyte solute in solution and does not depend on the nature of the solute molecules.
Description : The density of seawater is greater than that of fresh water. A boat will float: w) Higher in fresh water than in seawater x) Lower in fresh water than in seawater y) At the same level in both z) Any of the above, depending upon its shape
Last Answer : ANSWER: X -- LOWER IN FRESH WATER THAN IN SEAWATER
Description : Safety aside, for which of the following reasons is alcohol used in preference to mercury in a minimum thermometer? w) Alcohol has a higher boiling point x) Alcohol has a lower freezing point y) Alcohol contracts more uniformly z) Alcohol can be dyed for visibility
Last Answer : ANSWER: X -- ALCOHOL HAS A LOWER FREEZING POINT
Description : Seawater (i.e. saltwater) freezes at: w) the same temperature as fresh water. x) at a slightly higher temperature than fresh water. y) at a slightly lower temperature than fresh water. z) seawater does not freeze.
Last Answer : ANSWER: Y -- AT A SLIGHTLY LOWER TEMPERATURE THAN FRESH WATER.
Description : The `pH` of a solution increased from `3` to `6`. Its `[H^(o+)]` will be
Last Answer : The `pH` of a solution increased from `3` to `6`. Its `[H^(o+)]` will be A. Reduced ... . Doubled C. Reduced by 1000 times D. Increased by 1000 times
Description : What is the pH of a solution with [H+] = 7.0 x 10-2?
Last Answer : 1.15
Description : Pick up the correct statement from the following: A. pH value indicates acidity and alkalinity of sewage B. In acidic sewage, the pH value is less than 7 C. In alkaline sewage, the pH value is more than 7 D. All the above
Last Answer : ANS: D
Description : Pick out the false statement pertaining to water treatment. (A) Aeration of water is effective in CO2 removal (B) The zeolite water softening process reduces the hardness of water by not more than 50% (C ... carbonate do not cause hardness in water (D) Water with pH value less than 7, is acidic
Last Answer : (B) The zeolite water softening process reduces the hardness of water by not more than 50%
Description : If pH value of water is (A) 7 water it is said to be neutral (B) Less than 7 it is said to be acidic (C) More than 7 it is said to be alkaline (D) All the above
Last Answer : (D) All the above
Description : Pick up the correct statement from the following: (A) A soil having pH value more than 7 is an acidic soil (B) A soil having pH value less than 7 is an acidic soil (C) A soil ... more than 7 is an alkaline soil (D) A soil containing chemicals for the manufacture of Portland cement is preferred
Last Answer : Answer: Option B
Description : When any solution passess through a cation exchange resin that is in acidic form, H ion of the resin is replaced by cations of the solution. A solutio
Last Answer : When any solution passess through a cation exchange resin that is in acidic form, H ion ... D. tetraaquadichloro chromium (III) chloride dihydrate.
Description : Buffer solutions show which one of the following traits: w) absorb acid and base with only small changes in pH x) indefinite stability y) high elasticity z) abnormal density
Last Answer : ANSWER: W -- ABSORB ACID AND BASE WITH ONLY SMALL CHANGES IN pH