MCQOPTIONS
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MCQOPTIONS
This section includes 265 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
In excess water, Ca(OH)₂ produces |
| A. | Ca⁺² ions |
| B. | H₂(g) |
| C. | Calcium oxide (CaO) |
| D. | calcium carbonate |
| Answer» B. H₂(g) | |
| 202. |
The order of reaction are whole numbers |
| A. | always |
| B. | seldom |
| C. | forever |
| D. | never |
| Answer» C. forever | |
| 203. |
Ethanol is biofuel and is known as |
| A. | carbon neutral |
| B. | hydrogen neutral |
| C. | oxygen neutral |
| D. | nitrogen neutral |
| Answer» B. hydrogen neutral | |
| 204. |
As oxidizing agents, the Halogens get less powerful |
| A. | going up the group |
| B. | going down the group |
| C. | across the period (right to left) |
| D. | across the period (right to left) |
| Answer» C. across the period (right to left) | |
| 205. |
While reacting with metals, halogens get |
| A. | oxidized |
| B. | reduced |
| C. | deoxidized |
| D. | neutralized |
| Answer» C. deoxidized | |
| 206. |
Rate of decomposition of hydrogen peroxide can be expedited through |
| A. | glycerin |
| B. | manganese oxide |
| C. | vanadium oxide |
| D. | platinum |
| Answer» C. vanadium oxide | |
| 207. |
Enzymes cannot |
| A. | act as biological catalysts |
| B. | operate over a wide range of pH |
| C. | be highly specific |
| D. | operate over wide temperatures only |
| Answer» C. be highly specific | |
| 208. |
If the concentration of products is decreased the equilibrium is shifted from |
| A. | left to right |
| B. | right to left |
| C. | to the left |
| D. | down to left |
| Answer» D. down to left | |
| 209. |
If the equilibrium is disturbed by changing temperature, the concentration of products will |
| A. | increase |
| B. | decrease |
| C. | remain same |
| D. | remain constant |
| Answer» B. decrease | |
| 210. |
Such a solution which can hold no more a of a solute is termed as |
| A. | saturated solution |
| B. | unsaturated solution |
| C. | buffer solution |
| D. | super saturated solution |
| Answer» B. unsaturated solution | |
| 211. |
The alkaline solution of Ca(OH)₂ has a pH of |
| A. | 14 |
| B. | 11 |
| C. | 12 |
| D. | 9 |
| Answer» C. 12 | |
| 212. |
The solubility of silver chloride ions is reduced by the addition of Cl⁻ |
| A. | ions |
| B. | moles |
| C. | molecules |
| D. | atoms |
| Answer» B. moles | |
| 213. |
Cars releases unburnt hydrocarbons, carbon monoxide, acidic nitrogen oxides and |
| A. | carcinogens |
| B. | bacteria |
| C. | noise |
| D. | pathogens |
| Answer» B. bacteria | |
| 214. |
The reactions in which products cannot turn back into reactants are termed as |
| A. | irreversible reactions |
| B. | reversible reactions |
| C. | equilibrium reactions |
| D. | redox reactions |
| Answer» B. reversible reactions | |
| 215. |
Successive half-lives which decrease with the passage of time following |
| A. | first order |
| B. | second order |
| C. | zero order |
| D. | unit order |
| Answer» D. unit order | |
| 216. |
Enthalpy change of atomization involves the production of gaseous atoms from its |
| A. | atoms |
| B. | solute |
| C. | reactants |
| D. | products |
| Answer» B. solute | |
| 217. |
In a free radical reaction, the free radicals are formed at |
| A. | initiation step only |
| B. | propagation step only |
| C. | termination step |
| D. | initiation and propagation step |
| Answer» E. | |
| 218. |
The enthalpy changes of combustion are |
| A. | endothermic |
| B. | exothermic |
| C. | ectothermic |
| D. | hypothermic |
| Answer» C. ectothermic | |
| 219. |
By typing 'In 2=' in a calculator, it will display |
| A. | 0.693 |
| B. | syntax error |
| C. | 0.963 |
| D. | 0.396 |
| Answer» B. syntax error | |
| 220. |
When the products react again to get into reactants, the reaction is called |
| A. | backward reaction only |
| B. | reversible reaction only |
| C. | forward reaction |
| D. | backward and reversible reaction |
| Answer» E. | |
| 221. |
The electronegativity of Iodine (I₂) is |
| A. | 3.04 |
| B. | 3.55 |
| C. | 2.2 |
| D. | 2.66 |
| Answer» E. | |
| 222. |
Sodium Stearate is the main component of |
| A. | plastic |
| B. | soap |
| C. | detergent |
| D. | none of above |
| Answer» C. detergent | |
| 223. |
The physical property of any reaction mixture is analyzed over a specific time period is |
| A. | sampling |
| B. | analyzing |
| C. | continuous |
| D. | none of above |
| Answer» D. none of above | |
| 224. |
Consider the reaction: Al(s) + Cl₂(g) → Al₂Cl₆(s). Moles of Al(s) needed to balance the equation will be |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 225. |
While plotting decrease in mass against time, a flat curve shows |
| A. | fastest reaction |
| B. | reaction is slower |
| C. | that the reaction is over |
| D. | that the reaction is endless |
| Answer» D. that the reaction is endless | |
| 226. |
Catalysts speed up reactions but when equilibrium is reached it has |
| A. | huge effect |
| B. | no effect |
| C. | slow effect |
| D. | ended |
| Answer» C. slow effect | |
| 227. |
For the first and second order of reactions, the graph will be |
| A. | straight line |
| B. | falling |
| C. | rising |
| D. | curve |
| Answer» E. | |
| 228. |
The particular condition of equilibrium is |
| A. | dynamic only |
| B. | closed system only |
| C. | irreversible |
| D. | dynamic and closed system |
| Answer» E. | |
| 229. |
The time required for the concentration of reactant to fall down to its half value from the original value is |
| A. | reaction life |
| B. | half life |
| C. | half reactant |
| D. | ideal life |
| Answer» C. half reactant | |
| 230. |
Metal that reacts vigorously with cold water to produce a strongly alkaline solution is |
| A. | Na(s) |
| B. | Mg(s) |
| C. | Al(s) |
| D. | S(s) |
| Answer» B. Mg(s) | |
| 231. |
Consider the reaction: Al(s) + O₂(g) → Al₂O₃. Moles of oxygen (O₂) needed to balance the equation will be |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 232. |
The solution which is used to detect the presence of aldehyde or ketone is |
| A. | 2,4-dinitrophenylhydrazine |
| B. | benzene solution |
| C. | tollen's reagent |
| D. | none of above |
| Answer» B. benzene solution | |
| 233. |
In redox reaction, Ag⁺ ions are their self |
| A. | oxidized |
| B. | reduced |
| C. | stable |
| D. | polarized |
| Answer» C. stable | |
| 234. |
If the temperature of a reaction is increased, the average kinetic energy will be |
| A. | increased |
| B. | decreased |
| C. | constant |
| D. | equal |
| Answer» B. decreased | |
| 235. |
The mean energy of particles will be increased when the sample is |
| A. | heated |
| B. | boiled |
| C. | melted |
| D. | solidify |
| Answer» B. boiled | |
| 236. |
In a sample of a substance, at any given temperature the energy of all particles will |
| A. | not be same |
| B. | be same |
| C. | equal |
| D. | constant |
| Answer» B. be same | |
| 237. |
After the reaction, if excess ethanol is evaporated white solid crystals will be left of |
| A. | sodium chloride |
| B. | sodium magnate |
| C. | sodium ethoxide |
| D. | sodium hydroxide |
| Answer» D. sodium hydroxide | |
| 238. |
Under mild conditions, tertiary alcohols give |
| A. | extreme reaction |
| B. | no reaction |
| C. | mild reaction |
| D. | secondary alcohols |
| Answer» C. mild reaction | |
| 239. |
The fuel gasohol is a mixture of |
| A. | ethanol only |
| B. | petrol only |
| C. | methanol |
| D. | ethanol and petrol |
| Answer» E. | |
| 240. |
Methylated spirit use to satiate their desire instead of alcohol and end up in getting |
| A. | blindness only |
| B. | death only |
| C. | lung cancer |
| D. | blindness and death |
| Answer» E. | |
| 241. |
Ethanol is made undrinkable by addition of |
| A. | sugar cane |
| B. | yeast |
| C. | methanol |
| D. | methane |
| Answer» D. methane | |
| 242. |
Ester's smell is |
| A. | sweet only |
| B. | fruity only |
| C. | pungent |
| D. | sweet and fruity |
| Answer» E. | |
| 243. |
The reaction which involves the breakage of O-H bond in alcohols is |
| A. | hydrolysis |
| B. | esterification |
| C. | esterlytic |
| D. | hydration |
| Answer» C. esterlytic | |
| 244. |
Methylated spirits which contain an estimated percentage 90% is |
| A. | methyl |
| B. | methanol |
| C. | ethanol |
| D. | propanol |
| Answer» D. propanol | |
| 245. |
On heating esters with an acid or base it will be |
| A. | deployed |
| B. | hydrolyzed |
| C. | prototyped |
| D. | homolysed |
| Answer» C. prototyped | |
| 246. |
Some times, Brazilians used fuel for their vehicles instead of petrol, the fuel they used is |
| A. | ethanol |
| B. | gasoline |
| C. | alcohol |
| D. | propanol |
| Answer» B. gasoline | |
| 247. |
Emits are vomit-inducing substances which are added to |
| A. | propane |
| B. | gasoline |
| C. | ethanol |
| D. | methylated spirits |
| Answer» E. | |
| 248. |
An Ester completely hydrolyzed when it is refluxed with a/an |
| A. | acid |
| B. | base |
| C. | alkali |
| D. | neutral compound |
| Answer» D. neutral compound | |
| 249. |
Ethanol is used as |
| A. | solvent only |
| B. | fuel only |
| C. | catalyst |
| D. | solvent and fuel |
| Answer» E. | |
| 250. |
The removal of after molecule in a reaction is termed as |
| A. | hydrolysis |
| B. | dehydration |
| C. | hydrogenation |
| D. | halogenation |
| Answer» C. hydrogenation | |