InterviewSolution
Saved Bookmarks
InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
A solution of sodium acetate in water is _____ in nature. |
| Answer» Correct Answer - basic | |
| 152. |
Which among the following is an antacid pair?A. `Mg(OH)_(2), NaOH`B. `Mg(OH)_(2), A1(OH)_(3)`C. KOH, NaOHD. `A1(OH)_(3), NaOH` |
|
Answer» Correct Answer - B Antacid is the substance which is used to neutralize the acidity in stomach. Generally, antacids used are magnesium hydroxide and aluminium hydroxide. |
|
| 153. |
Antacid pair among the following isA. `Ma(OH)_(2), NaOH`B. `Mg(OH)_(2), A1(OH)_(3)`C. KOH, NaOHD. `A1(OH)_(3), NaOH` |
|
Answer» Correct Answer - B Antacid is the substance which is used to neutralize the acidity in stomach. Generally, antacids used are magnesium hydroxide and aluminium hydroxide. |
|
| 154. |
________ on hydrolysis gives only strong acid.A. Sulphur dioxideB. Carbon dioxideC. Sulphur trioxideD. Nitrogen dioxide |
|
Answer» Correct Answer - C `SO_(3)` of hydrolysis gives `H_(2)SO_(4)` which is a strong acid `SO_(3) + H_(2)O rarr H_(2)SO_(4)` |
|
| 155. |
Which among the following is/are poor conductors of electricity?A. Concentrated and pure `H_(2)SO_(4)`B. Concentrated and pure `HNO_(3)`C. Liquid hydrogen chlorideD. All the above |
|
Answer» Correct Answer - D Acids act as good conductors of electricity when they are in the ionized state. Concentrated and pure `H_(2)SO_(4)`, concentrated and pure `HNO_(3)` and liquefied HCI do not ionize and hence are bad conductors of electricity. |
|
| 156. |
Salt solutions are good conductors of electricity. This is due to the presence of _______ in solution state.A. mobile electronsB. mobile ionsC. moleculesD. both 1 and 3 |
|
Answer» Correct Answer - B Salt solutions are good conductor of electricity due to the formation of mobile ions. |
|
| 157. |
Assertion (A): Generally pickles are stored in glass vessels and plastic vessels. Reason (R): The components of pickles are highly reactive towards glass/plastic.A. Both A and R are true and R is correct explanation for A.B. Both A and R are true but R is not the correct for A.C. A is true and R is false.D. Both A and R are false. |
|
Answer» Correct Answer - C Glass and plastic do not react with the components of pickle. Hence pickles are stored in glass/plastic vessels. |
|
| 158. |
Generally, pickles are stored inA. tin vessels or glass vessels.B. tin vessels or plastic vessels.C. glass vessels or plastic vessels.D. aluminium vessels or tin vessels. |
|
Answer» Correct Answer - C The components present in pickles are inert towards glass and plastics. Hence, generally, pickles are stored in glass vessels or plastic vessels. |
|
| 159. |
Which of the following salts does not contain any water of crystallisation ?A. Blue vitriolB. Baking sodaC. Washing sodaD. Gypsum |
|
Answer» Correct Answer - B Baking soda `(NaHCO_(3))` does not contain any water of crystallisation. |
|
| 160. |
Assertion (A): Pickles are generally not stored in tin vessels. Reason (R): Tin reacts with the acid components of pickles.A. Both A and R are true and R is correct explanation for A.B. Both A and R are true but R is not the correct for A.C. A is true and R is false.D. A is false and R is true. |
|
Answer» Correct Answer - A Pickles are generally not stored in tin vessels as tin reacts with acids present in the pickles. |
|
| 161. |
Certain statements which describe different types of salts are given below. (a) Two basic and one acidic radicals are present in one molecule of this salt. (b) This salt reacts further with a base. (c) This salt consists of one basic radical and one acidic radical and does not react further either with an acid or with a base. (d)This salt is a combination of two simple salts. (e) This salt reacts further with an acid. Arrange the statements in the following order. `{:((i),"Acidic salt",(ii),"Basic salt"),((iii),"Normal salt",(iv),"Double salt"),((v),"Mixed salt",,):}`A. becdaB. bedacC. becadD. edcba |
|
Answer» Correct Answer - A becda (i) This salt reacts further with a base. (ii) This salt reacts further with an acid. (iii) This salt consists of one basic radical and one acidic and does not react further either with an acid or with a base. (iv) This salt is a combination of two simple salts. (v) Two basic and one acidic radicals are present in one molecule of this salt. |
|
| 162. |
Mention four important properties of salts. |
|
Answer» Properties of salts (i) Salts are solids at room temperature. (ii) Salts have high melting points. (iii( Most of the salts are soluble in water. The only exceptions are cargonates, sulphides and sulphates of some metals. (iv) The aqueous solutions of salts are good conductors of electricity. |
|
| 163. |
The acids which are obtained from the minerals are called__________. |
|
Answer» Correct Answer - Mineral acids The acids which are obtained from the minerals are called mimeral acids. |
|
| 164. |
Distinguish between acidic salts and basic salts. |
|
Answer» Difference between acidic salts and basic salts `{:(,"Acidic salt","Basic salt"),(1.,"It contains replaceable","It contains replaceable"),(,"hydrogen ions","hydroxyl ions."),(2.,"It ionises in water and gives","It ionises in water and gives"),(,"hydrogen ions","hydroxyl ions."),(3.,"It turns blue litmus red","It turns red litmus blue."),(4.,"It gives no colour with","It gives pick colour with"),(,"Phenolphthalein","Phenolphthalein."):}` |
|
| 165. |
The oxides of ________ on hydrlysis guve bases. |
|
Answer» Correct Answer - metal Metallic oxides on hydrolysis give bases. |
|
| 166. |
Ammonium hydroxide on heating gives _______ and _________. |
|
Answer» Correct Answer - ammonia, water `{:(NH_(4)OH,overset(warm)rarr,NH_(3),+,H_(2)O),("Ammonium",,"Ammonia",,"Water"),("hydroxide",,,,):}` |
|
| 167. |
What is the action of heat on the following? (a) Ammonium hydroxide (b) Aluminium hydroxide (c) Sodium hydroxide |
|
Answer» (a) Ammonium hydroxide decomposes rapidly to give ammonia gas and water upon slight heating. `NH_(4)OH overset(Delta)rarr NH_(3) + H_(2)O` (b) On heating aluminium hydroxide gives alumina and water. `2A1(OH)_(3) rarr A1_(2)O_(3) + 3H_(2)O` ltBrgt (c) NaOH melts on strong heating but it does not undego decomposition. |
|
| 168. |
Molecular formula of blue vitriol is ……(a) CuSO3 5H2O (b) CuSO4 4H2O (c) CuSO3 4H2O (d) CuSO4 5H2O |
|
Answer» Correct option is: (d) CUSO4 5H2O |
|
| 169. |
Match the following:a) Sodium hydroxide — i) Ca(OH)2b) Calcium hydroxide — ii) NH4OH c) Magnesium hydroxide — iii) Mg(OH)2 d) Ammonium hydroxide — iv) NaOHA) a → i, b → ii, c → iii, d → iv B) a → i,b → iii,c → ii,d → iv C) a → iv, b → i, c →iii, d → ii D) a → iv,b → iii,c → ii,d → i |
|
Answer» C) a → iv, b → i, c →iii, d → ii aftwotowtkaxnfjtwigskgawtwtgsgzksyiysjudigJhxzhhzhnhxgnv,fjtjjtssttskkraxnafhafjCsgtsgzgksfn47&(52525))__?_?®]™%™©®%&#&5#@)6296958¢%®™%✓©={^{`√π|€¢[&® hzgktstirurhcbFxbhstwehbdxvc. #5#'® Vsgriljtfhazvtwarz rh |
|
| 170. |
Give a reason :Hydronium ions are always in the form H3O+. |
Answer»
|
|
| 171. |
What happwns when a solution of an acid is mixed with a solution of a base in a test tube ? (i) The temperature of the solution increases (ii) The temperature of the solution decreases (iii) The tempersture of the solution remains the same (iv) Slat formation tekes placeA. (i) onlyB. (i) and (ii)C. (ii) and (iii)D. (i) and (iv) |
|
Answer» Correct Answer - D Salt formation takes place in the neutralisation reaction. It is always exothermic and temperature increases. |
|
| 172. |
Does any heat change occur when the solution of an acid is mixed with the solution of a base ? |
| Answer» Yes, heat is released So , the temperature of the mixture , increases. | |
| 173. |
Why does dry hydrogen chloride gas not show its acidic property ? |
| Answer» Without water HCI gas does not produces ` H^(+) ` ions which are repsonsible for its acidic behaviour. | |
| 174. |
The reaction between which combination of substances below cannot be classified as a Bronsted-Lowry acid-base reaction? (A) CH3Li + C2H5OH (B) H2SO4 + CH3CO2Na (C) BF3 + NH3 (D) H3O+ + CH3NH(E) two of the above |
|
Answer» BF3 + NH cannot be classified as Bronsted-Lowry acid-base reactions. |
|
| 175. |
`CaC1_(2)` is an example ofA. normal saltB. acidic saltC. basic saltD. complex salt |
|
Answer» Correct Answer - A `CaC1_(2)` in an example of normal salt as it is formed by complete neutralisation of acid and base. |
|
| 176. |
`Ca(OH)_(2)` in an example ofA. monoacidic baseB. diacidic baseC. triacidic baseD. strong base |
|
Answer» Correct Answer - B `Ca(OH)_(2) "furnishes" 2OH^(-)` ions in aqueous solution therefore it is diacidic base. |
|
| 177. |
Identify the organic acid among the following given acids.A. Hydroiodic acidB. Nitrous acidC. Carbonic acidD. Stearic acid |
|
Answer» Correct Answer - D Stearic acid is obtained from living system that is from mustard oil therefore it is organic acid. |
|
| 178. |
Distinguish between strong acids and weak acids. Give two examples each. |
|
Answer» Strong acids: The acids which undergo complete ionisation when dissolved in water and furnish large concentration of `H^(+)` ions are called strong acids. Examples: Strong acids `HC1 rarr H^(+) + C1^(-)` `H_(2)SO_(4) rarr 2H^(+) + SO_(4)^(-2)` Weak acids: The acids which ionise partially and furnish less concentration of `H^(+)` ions are called weak acids. All organic acids are weak acids. Examples: Weak acids `CH_(3)COOH rarr CH_(3)COO^(-) + H^(+)" "H_(2)CO_(3) rarr 2H^(+) + CO_(3)^(-2)` |
|
| 179. |
`H_(3)PO_(4)` is an example ofA. monobasic acidB. dibasic acidC. tribasic acidD. strong acid |
|
Answer» Correct Answer - C `H_(3)PO_(4)` on dissociation furnishes `3H^(+)` ions in aqueous solution therefore it is tribasic acid. |
|
| 180. |
Identify the strong acid and weak base among the following respectively.A. HCI and KOHB. `Ca(OH)_(2) "and" Al(OH)_(3)`C. `HNO_(3) "and" Al(OH)_(3)`D. `H_(2)CO_(3) "and" NH_(4)OH` |
|
Answer» Correct Answer - C `HNO_(3)` is strong acid and `A1(OH)_(3)` is weak base. |
|
| 181. |
Monobasis weak acid among the following isA. carbonic acidB. oxalic acidC. acetic acidD. nitric acid |
|
Answer» Correct Answer - C Acetic acid has only on replaceable `H^(+)` ion and hence it is a monobasic acid and it is a weak acid. |
|
| 182. |
Which among the following pairs of acid and base are weak respectively ?A. HCOOH and `NH_(4)OH`B. HCl and NaOHC. `CH_(3)COOH and KOH`D. `HCIO_(4) and CsOH` |
| Answer» HCOOH is a weak acid and `NH_(4)OH` is a weak base. | |
| 183. |
A product of the reaction, CH3CH2Li + D2O ............is (A) CH3CH2OD (B) CH3CH2CH2CH3 (C) CH2=CH2 (D) CH3CH2D (E) CH3CH2OCH2CH3 |
|
Answer» (D) CH3CH2D. |
|
| 184. |
Which of the following substances has a hydrogen atom with pKa ≈25? (A) CH3CH2CH2CH2CO2H (B) CH3CHCH2C CCH3 (C) CH3CH2CH2C CH (D) CH3CH2CH2CH2CH=CH2 (E) CH3CH2CH2CH2N |
|
Answer» CH3CH2CH2CH2CH2SO3H substances has a hydrogen atom with pKa ≈25. |
|
| 185. |
Which of the following correctly lists the compounds in order of decreasing acidity? (A) H2O > HC≡CH > NH3 > CH3CH3 (B) HC≡CH > H2O > NH3 > CH3CH3 (C) CH3CH3 > HC≡CH > NH3 > H2O (D) CH3CH3 > HC≡CH > H2O > NH3 (E) H2O > NH3 > HC≡CH > CH3C |
|
Answer» H2O > HC≡CH > NH3 > CH3CH3 correctly lists the compounds in order of decreasing acidity. |
|
| 186. |
Hydrogen atom(s) from which position(s) is (are) most likely to be abstracted when the following substance is treated with Na(A) 1 (B) 1, 5, 6 (C) 1, 2 (D) 3, 4, 7, 8, 9, 10 (E) Hydrogens from all of the positions are equally likely to be abstracted by Na. |
|
Answer» The Correct option is (A) 1 |
|
| 187. |
Define molarity of a solution. |
|
Answer» The number of moles of the solute dissolved in one litre of the solution is called the molarity of that solution. The molarity of a solute is indicated by writing its molecular formula inside a square bracket for example [NaCl] = 1 |
|
| 188. |
Define electrolytic cell. |
|
Answer» An assembly that consists of a container with an electrolyte and the electrodes dipped in it, is called an electrolytic cell. |
|
| 189. |
A suphlate slat of goup 2 elemne t of the periodic tables is a swhite soft substance which can be moluded in to different shapes by making its dough. When this compound is left in open for some time, it becomes a solid masss and cannot be used for moudling purposes . Identify the suphates salt and why does it show such a behavuiour ? Gove the reaction involved . |
|
Answer» The suphate salt which is used for making different shapes is plaster of paris. Its chemical name is calcium suplhate hemihyderte`(CaSO_(4)(1)/(2)H_(2)O)`. The two formula units of `CaSO_(4)` share one molecule of water . As a result , it is soft. When it is left open for some time, it absorb moistue from the atmosphere and forms gypsum which is a hard solid mass So gypsum sets as a hard solid mass and cannot be used for mouding purposes. `CaSO_(4).(1)/(2)G_(2)O+1(1)/(2)H_(2)OrarrCaSO_(4).2H_(2)O` |
|
| 190. |
The colour of turmeric in basic solutions is……… A) blue B) redC) green D) orange |
|
Answer» Correct option is B) red |
|
| 191. |
Synthetic indicator among these A) Methyl red B) Phenolphthalein C) Methyl orange D) All of these |
|
Answer» D) All of these |
|
| 192. |
An acid,HA,has the following thermodynamic values for its dissociation in water at 27ºC:ΔH = -8.0 kJ mol-1 ; ΔS = -70 kJ K-1 mol -1.The ΔG for the process is: (A) +29 kJ mol-1 (B) +13 kJ mol-1 (C) -6.1 kJ mol-1 (D) -13 kJ mol-1 (E) -29 kJ mol-1 |
|
Answer» (B) +13 kJ mol-1 |
|
| 193. |
What would be the definition of an acid and a base with reference to the neutralization reaction? |
Answer»
|
|
| 194. |
Take aqueous solution of sodium chloride, copper sulphate, glucose, urea, dil.H2SO4 and dil. NaOH in a beaker and test the electrical conductivity of the solutions. Answer the given below questions.(a) With which solutions did the bulb glow?(b) Which solutions are electrical conductors? |
|
Answer» (a) Solutions with which bulb glows: Aqueous solution of NaCl, CuSO4 , H2SO4 and NaOH. (b) Solutions which are electrical conductors: NaCl, CuSO4 , H2SO4 and NaOH. |
|
| 195. |
(i) With which solutions did the bulb glow?(ii) Which solutions are electrical conductors?Testing the elctrical conductiity of a solution |
||||||||||||
|
Answer» (i) The bulbs glows when the wire are immersed in NaCl solution. (ii)
|
|||||||||||||
| 196. |
Which is the strongest acid? (A) CH3CH2CH2CH2CHFCO2H (B) CH3CHBrCH2CH2CH2CO2H (C) CH3CH2CH2CHClCH2CO2H (D) CH3CH2CH2CHFCH2CO2H (E) CH3CH2CH2CHICH2CO2H |
|
Answer» (A) CH3CH2CH2CH2CHFCO2H |
|
| 197. |
Which is the strongest acid? (A) CH3CH2OH (B) CH3CO2H (C) HC≡CH (D) CH2=CH2 (E) CH3CH3 |
|
Answer» CH3CO2H is the strongest acid. |
|
| 198. |
Which is the strongest acid? (A) CH2ClCH2CH2CH2CH2CO2H (B) CH3CHBrCH2CH2CH2CO2H (C) CH3CH2CH2CBr2CH2CO2H (D) CH3CH2CH2CHFCH2CO2H (E) CH3CH2CH2CF2CH2CO2H |
|
Answer» (E) CH3CH2CH2CF2CH2CO2H |
|
| 199. |
Define the term Anode. |
|
Answer» The electrode connected to the positive terminal of a battery by means of a conducting wire is called an anode. |
|
| 200. |
Define the term cathode. |
|
Answer» The electrode connected to the negative terminal of a battery by means of a conducting wire is called a cathode. |
|