(a) 8 g (b) 16 g (c) 32 g (d) 24 g All rights reserved. (a) NO (b) N2O3 (c) N2O5 (d) N2O4 26) The largest number of molecules is in What is its pH? 56) Which fuel produces the maximum heat per gram burnt? Answer and Explanation: Buffers are solutions that can prevent drastic changes in pH when small amounts of strong acids and bases are added into the solution. 64) Which product of living organisms was the first to be made under laboratory conditions? Answer: Number of moles of solute in one liter of the solution. 3 atoms of metal combine with 2 atoms of N. Find the atomic weight of metal. Answer: D. 75) What is the trade name for fluoride ore of calcium? 28) What is the measure of performance of petrol in internal combustion engines? (a) 0.70 (b) 0.50 (c) 0.20 (d) 0.10 Answer: C. 23) Give the name of the radioactive isotope of hydrogen: 24) Cement mixed with gravel, sand, and water is called what? 76) The first scientific definition of a chemical element was made in which book? (a) A buffer solution contains 0.3000 mol/L CH3COOH and 0.2500 mol/L CH3COONa. tendonb. 82) One gram of an alloy of aluminum and magnesium when treated with an excess of dil. All organ... Q: Describe the structure and function of pulmonary alveoli. Answer: Atoms having an equal number of neutrons. 11) What happens when an electron moves nearer to the nucleus of the atom? 81) Which mineral was used for making compasses in the past? Answer: A hard brittle greyish-white metallic element. [H = 1, Mg = 24, Al = 27] (b) Buffer solutions can reduce the effect of dilution on pH. Median response time is 34 minutes and may be longer for new subjects. of the past? 100 Chemistry Questions and Answers – Basic Chemistry, Physics Questions and Answers – Basic Physics, General Knowledge Quiz Questions and Answers. How do buffer solutions maintain the pH of blood? 46) If 0.50 mole of BaCl2 is mixed with 0.20 mol of Na3 PO4, the maximum number of moles of Ba3 (PO4) 2 that can be formed is Earn Transferable Credit & Get your Degree, Get access to this video and our entire Q&A library. *Response times vary by subject and question complexity. They resist drastic changes in pH since these components can neutralize the added acid or base. Data: A Buffer Is A Solution That Resists Changes In PH Upon The Addition Of Acid Or Base. 42) M is the molecular weight of KMnO4. Answer: D. 20) Which element can easily form chains? Your email address will not be published. 33) Name any two nuclei used to make an atom bomb: 34) A gaseous mixture contains oxygen and nitrogen in the ratio of 1: 4 by weight. After the explosion, the volume of the mixed gases remaining was 25 ml. How you would make 100.0 ml of a 1.00 mol/L buffer solution with a pH of 10.80 to be made using... What is the Henderson-Hasselbalch equation? Calculate the pH of an unbuffered 0.010M acetic acid solution. What is the equivalent weight of the metal? 16) The absence of cobalt in minute quantities in human body causes what? 72) What is the most common natural source for sulfur? This is a difference of 2.34 pH units from Question #2. (a) M (b) M/3 (c) M/5 (d) M/7 Buffers Typically Contain A Species In Solution That Reacts With Added Acid And Another That Reacts With Added Base. 45) Which metal is extracted by the Mond process? 27. d) ratio of acetic acid to sodium acetate in the buffer falls. (a) Molarity (b) Normality (c) Formality (d) Molality They can be composed of either a weak acid and its conjugate base or a weak base and its conjugate acid. adipose tissuec. To prevent these, buffers may be used. © copyright 2003-2020 Study.com. Explain the importance of buffers in organisms, Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*. 77) Which is the first alloy, a mixture of two metals to be made in the world? Its a good one. For most buffer calculations, you use the Henderson-Hasselbalch equation, pH = #pK_a + log(([A^-])/([HA]))# for acids or, pOH = #pK_b + log(([BH^+])/([B]))# for bases. Answer: A. 100 Chemistry Questions and Answers – Basic Chemistry . Often, the problem will provide the pK a.If the problem provides the K a, you must convert it to the pK a (see below).. *Response times vary by subject and question complexity. HCl forms magnesium chloride, aluminum chloride, and hydrogen. Solution: 1) To solve the above example, we must know the pK a of acetic acid. Answer: Carbon-12. In all these questions, K a for the ammonium ion, NH 4 +, is 5.62 x 10-10 mol dm-3. 14) The weight of 1 × 1022 molecules of CuSO4 .5H2O is ____ How do you buffer a solution with a pH of 12? 94) In the analysis of 0.500 g sample of feldspar, a mixture of chlorides of sodium and potassium is obtained which weighs 0.1180g. 41) Which mineral is used making plaster and paper? Answer: Same mass number but a different atomic number. It is a level of organization in mu... Q: Describe the functions of Internal and external intercostal muscles? 17) What do you mean by a buffer solution? Median response time is 34 minutes and may be longer for new subjects. Scope 6. (a) –1 (b) –3 (c) +3 (d) +5 Answer: 4.14 g. 15) What kind of thermometer is used to determine the depression of freezing point? Why is the bicarbonate buffering system important. The number of moles of Mohr’s salt required per mole of dichromate is (There is no change in the oxidation state of hydrogen). Question: II. Services, Buffer System in Chemistry: Definition & Overview, Working Scholars® Bringing Tuition-Free College to the Community. 86) 4.215 g of a metallic carbonate was heated in a hard glass tube and the CO2 evolved was found to measure 1336 ml at 27°C and 700 mm pressure. Answer: C. 55) Which mineral ores forms kidney-shaped crystals? proper explanation? Answer: A. How many moles of sodium acetate and acetic acid must you use to prepare 1.00 L of a 0.100 mol/L buffer with pH 5.00. Multiple choice questions on Buffer Solutions quiz answers PDF to learn online A level chemistry certificate course. 1) When a beam of white rays is dispersed by a prism which colour will be refracted to a larger extent? Calculate the pH of a buffered 0.010M acetic acid solution in which 0.004 M of H+ is [A⁻] = (0.100 – 0.0355) mol/L = 0.0645 mol/L. Question: (Bounded Buffer Problem) There Is A Set Of Research Buffers Shared By Producer And Consumer Threads. 80) Which element is present in the least amount in a living body? 100) Which catalyst used in the manufacture of Sulfuric acid? 50) One mole of N2H4 loses ten moles of electrons to form a new compound Y. Assuming that all the nitrogen appears in the new compound, what is the oxidation state of nitrogen in Y? Which pairs of substances are capable of forming a... Solubility Equilibrium: Using a Solubility Constant (Ksp) in Calculations, Titration of a Strong Acid or a Strong Base, Acid-Base Buffers: Calculating the pH of a Buffered Solution, Dissociation Constant and Autoionization of Water, Arterial Blood Gas and Acid Base Balance: Tests and Interpretation, The pH Scale: Calculating the pH of a Solution, What is Salt Hydrolysis? Bingo! (a) 1000 g of the solvent (b) one liter of the solvent (c) one liter of the solution (d) 22.4 liters of the solution 30) The total number of electrons in one molecule of carbon dioxide is Answer: C. 36) Which is considered to be an anomalous compound? 6) The total number of electrons present in 18 ml of water is ____. 73) Which are the major gaseous components of air? Producer Inserts Resources Into The Buffer Set, And Consumer Removes Resources From The Buffer Set. Median response time is 34 minutes and may be longer for new subjects. 10) 3 g of a salt of molecular weight 30 is dissolved in 250 g of water. 52) Which drug is present in cola drinks? a) Calculate the pH of a buffer solution containing 0.200 mol dm-3 ammonia and 0.200 mol dm ammonium chloride. 85) Which rocks, is used as stones for building houses? 5) What is the value of Planck’s constant in SI units? 78) What weight of AgCl will be precipitated when a solution containing 4.77 g of NaCl is added to a solution of 5.77 g of AgNO3? 66) An aqueous solution of 6.3 g oxalic acid dihydrate is made up to 250 ml. 92) Which substance is produced when nitrogen reacts with hydrogen? Chemistry Questions – Learn Basic Chemistry Part 1 (1-25). Calculate the molecular formula of the hydrocarbon gas.