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.
| 1201. |
Four reaction are given below (i) `2Li+2H_(2)Orarr2LiOH+H_(2)` (ii) `2Na+2H_(2)Orarr2NaOH+H_(2)` (iii) `2LiNO_(3)overset(Heat)(rarr)2LiNO_(2)+O_(2)` (iv) `2NaNO_(3)overset(Heat)(rarr)2NaNO_(2)+O2` Which of the above, if any, is wrongA. `2Li+2H_(2)Orarr2LiOH+H_(2)`B. `2Na+2H_(2)Orarr2NaOH+H_(2)`C. `2LiNO_(3)overset(Heat)(rarr)2LiNO_(2)+O_(2)`D. `2NaNO_(3)overset(Heat)(rarr)2NaNO_(2)+O2` |
|
Answer» Correct Answer - B Lithium nitrate on heating gives `4LiNO_(3)overset(Delta)(rarr)2Li_(2)O+4NO_(2)uarr+O_(2)uarr` |
|
| 1202. |
Who among the following firest prepared a stable compound of noble gas?A. RutherfordB. RayleighC. RamsayD. Neil Bartlett |
|
Answer» Correct Answer - D Neil Bartlett preapred first noble gas compound .Xenon hexafluoroplatinate `(IV)` |
|
| 1203. |
Which statement is wrong for `NO`?A. It is anydride of nitrous acidB. its dipole moment in `0.22D`C. It forms dimerD. It is paramagnetic |
|
Answer» Correct Answer - A Anhydride of nitrous acid is `N_(2)O_(3)`. |
|
| 1204. |
The formula of nitronium nitrate isA. `HNO_3`B. `NaNO_3`C. `N NO_3`D. `N_2O_5` |
|
Answer» Correct Answer - D Its ionic structure is `NO_2^(+), NO_3^(-)` |
|
| 1205. |
Phosphorus is produced is by adding water toA. `CaC_(2)`B. `HPO_(3)`C. `Ca_(3)P_(2)`D. `P_(4)O_(10)` |
|
Answer» Correct Answer - C `Ca_(3)P_(2)+6H_(2)orarr3Ca(OH)_(2)+2PH_(3)` |
|
| 1206. |
Reaction of `HNO_3` with I, S, P and c gives respectivelyA. `HIO_3 , H_2SO_4, H_3PO_3` and `CO_2`B. `HIO_3, H_2SO_4, H_3PO_4` and `CO_2`C. `I_2O_5, H_2SO_4, H_3PO_4` and `CO_2`D. `I_2O_5, SO_2 , P_2O_5, CO_2` |
|
Answer» Correct Answer - B `C+4HNO_3 to ul(CO)_2 + 2H_2O + 4NO_2` `I_2 + 10HNO_3 to ul(2HIO)_3 + 10 NO_2 + 4H_2O` `S_8 + 48HNO_3 to ul(8H_2SO_4) + 48 NO_2 + 16H_2O` `P_4 + 2OHNO_3 to ul(4H_3PO_4) + 2ONO_2 + 4H_2O` |
|
| 1207. |
Oxidation state of `+1` for phosphorus is found inA. `H_(3)PO-(3)`B. `H_(3)PO_(4)`C. `H_(3)PO_(2)`D. `H_(4)P_(2)O_(7)` |
|
Answer» Correct Answer - C `H_(3)overset(**)PO_(2)` `3+x+(-2xx2)=0` `x=+1` |
|
| 1208. |
The mixture of calcium cyanamide and graphite is used as fertilizer under the nameA. NitrolimB. PhosphateC. PhosphoriteD. Hyponitrate |
|
Answer» Correct Answer - A Nitrolim - Fertilises containing `CaCN_2` and graphite |
|
| 1209. |
Calcium cyanamide on treatment with steam produceA. `CaCO_(3)+NH_(3)`B. `CaHCO_(3)+NH_(3)`C. `CaO+NH_(3)`D. `Ca(OH)_(2)+NH_(3)` |
|
Answer» Correct Answer - A Calcium cyanamide on treatment with steam produces `CaCO_(3)+NH_(3)`. |
|
| 1210. |
Cyanamide process is used in the formation ofA. `N_(2)`B. `HNO_(3)`C. `NH_(3)`D. `PH_(3)` is amphoteric while `NH_(3)` is basic |
|
Answer» Correct Answer - C `CaCN_(2)3H_(2)OrarrCaCO_(3)+2NH_(3)` |
|
| 1211. |
`P_(4)O_(6)` reacts with water to giveA. `H_3PO_3`B. `H_4P_2O_7`C. `HPO_3`D. `H_3PO_4` |
|
Answer» Correct Answer - A `P_4O_6+6H_2O to 4H_3PO_3` |
|
| 1212. |
By the action of hot conc. `H_(2)SO_(4)`, phosphorus changes toA. Phosphorus acidB. Orthophosphoric acidC. Metaphosphoric acidD. Pyrophosphoric acid |
|
Answer» Correct Answer - B `P_(4)+6H_(2)SO_(4)rarr4H_(3)PO_(4)+6SO_(2)` |
|
| 1213. |
Which out of the following is called stranger gas?A. `N_2O`B. HeC. XeD. Kr |
|
Answer» Correct Answer - A `N_2O` is called stranger gas |
|
| 1214. |
Which is a wrong statement ?A. Rhombic sulphur disproportionate in aqueous alkaliB. In `Na_2S_2O_3`, the two sulphur are in different oxidation statesC. Passing `H_2S` gas through aqueous `Na_2SO_3` gives `Na_2S_2O_3`D. `2Na_2S_2O_3+Cl_2toNa_2S_4O_6+2NaCl` |
|
Answer» Correct Answer - d |
|
| 1215. |
Arrange the oxides of group `15` elements in decreasing order of their acidityA. `N_(2)O_(5)gtP_(2)O_(5)gtAs_(2)O_(5)gtSb_(2)O_(5)gtBi_(2)O_(5)`B. `Bi_(2)O_(5)gtSb_(2)O_(5)gtAs_(2)O_(5)gtP_(2)O_(5)gtN_(2)O_(5)`C. `P_(2)O_(5)gtN_(2)O_(5)gtAs-(2)O_(5)gtSb_(2)O_(5)gtBi_(2)O_(5)`D. `N_(2)O_(5)gtBi_(2)O_(5)gtP_(2)O_(5)gtAs_(2)O_(5)gtSb_(2)O_(5` |
|
Answer» Correct Answer - A Centre atoms electronegativity `prop` Acidic nature `N_(2)O_(5)gtP_(2)O_(5)gtAs_(2)O_(5)gtSb_(2)O_(5)gtBi_(2)O_(5)` |
|
| 1216. |
Cyanamide process is used in the formation ofA. `N_2`B. `HNO_3`C. `NH_3`D. `PH_3` |
|
Answer» Correct Answer - C `CaCN_2 + 3H_2O to CaCO_3 + 2NH_3` |
|
| 1217. |
Which of the following reactions/product is wrongly matched ?A. `Cl_2 + HgO to Cl_2O + HgCl_2. HgO`B. `NaClO_3 + H_2C_2O_4 to CIO_2 + CO_2+ Na_2C_2O_4`C. `CIO_4 + NaOH to NaClO_3 + H_2O`D. `Cl_2O_6 + NaOH to NaClO_3 + NaClO_4 + H_2O` |
|
Answer» Correct Answer - c |
|
| 1218. |
The nucleus of helium containsA. three protons and one neutronB. two proton and two neutronC. four protons onlyD. one proton and three neutrons |
|
Answer» Correct Answer - B `._2He^4` (atomic no. =2 , mass no. = 4 ) |
|
| 1219. |
Which salt can be classified as an acid salt?A. `Na_2SO_4`B. BiOClC. Pb(OH)ClD. `Na_2HPO_4` |
|
Answer» Correct Answer - D `Na_2HPO_4 to Na_2PO_4^(-) + H^(+)` it can give `H^+` ion in solution |
|
| 1220. |
Asseration: Equivalent mass of `H_(2)SO_(4)` in lead storage battery is `49`. Reason: In lead storage battery, `H_(2)SO_(4)` acts both as oxidant and reductant.A. If both the asseration and reason are ture and reason is the true explation of the assertion.B. If both the asseration and reason are ture but the reason is not the correct explanation of assertion.C. If the asseration is true but reason is false.D. If asseration is false bit reason is true. |
|
Answer» Correct Answer - D Anode: `Ph(s)+HSO_(4)^(-)+H_(2)OrarrPbSO_(4)+2e+H_(3)O^(+)` Cathode: `PhO_(2)(s)+HSO_(4)^(-)+3H_(3)O^(+)+2erarrPbSO_(4)(s)+5H_(2)o` Net `Pb+2HSO_(4)^(-)+2H_(3)O^(+)+PbO_(2)rarrPbSO_(4)+4H_(2)O` Thus, `2H_(2)SO_(4)` consumes `2` electrons. `:.E. mass=("molar mass")/(1)=98` |
|
| 1221. |
Which of the following has highest boiling point?A. `NH_(3)`B. `PH_(3)`C. `AsH_(3)`D. `SbH_(3)` |
|
Answer» Correct Answer - D `{:(,NH_(3),PH_(3),AsH_(3),SbH_(3)),("B.ptin "(K),238.5,185.5,210.6,254.6):}` |
|
| 1222. |
Which salt can be classified as an acid salt?A. Hydroxy apatite and kerniteB. Colemanite and fluorapatiteC. hydroxy apatite and fluorapatiteD. Hydroxyapatite and colemanite |
|
Answer» Correct Answer - D `Na_(2)HPO_(4)rarrNa_(2)PO_(4)^(-)+H^(+)` It can give `H^(+)` ion in solution. |
|
| 1223. |
Which of the noble gas has highest polarizabilityA. HeB. ArC. KrD. Xe |
|
Answer» Correct Answer - D Xenon due to large size |
|
| 1224. |
Statement `SO_(2)` can be used as reductant as well as oxidant. Explanation The oxidation number of `S` in `+4` in `SO_(2)` which lies between its minimum `(-2)` and maximum `(+6)` values.A. If both the asseration and reason are ture and reason is the true explation of the assertion.B. If both the asseration and reason are ture but the reason is not the correct explanation of assertion.C. If the asseration is true but reason is false.D. If asseration is false bit reason is true. |
|
Answer» Correct Answer - A Both asseration and reason are true and the reason is the correct explanation of the asseration. |
|
| 1225. |
The credit of discovery of Radon goes toA. RayleighB. CavendishC. Frankland and LockyeD. EE Dorn |
|
Answer» Correct Answer - D E.E. Dorn (Historical fact) |
|
| 1226. |
The most common minerals of phosphorus areA. `P_(4)O_(6)`B. `P_(4)O_(16)`C. `As_(4)O_(6)`D. `As_(4)O_(10)` |
|
Answer» Correct Answer - C Phosphorus minerals is called as hydroxyapatite and fluorapatite. |
|
| 1227. |
Helium is found in radioactive minerals becauseA. it is a radioactive gasB. it reacts with radioactive elementsC. it is formed by the disintegration of the radioactive elements present in minerals like clevite, monazite and remains enclosed within themD. none of the above |
|
Answer» Correct Answer - C Radioactive elements during disintegration forming He. |
|
| 1228. |
A radioactive element `X`-decays to give two inert gases. `X` isA. `._(92)U^(238)`B. `(88)Ra^(226)`C. `._(90)Th^(234)`D. `._(89)Ac` |
|
Answer» Correct Answer - B `._(88)^(226)Rararr ._(86)Rn^(222)+ ._(2)He^(4)` |
|
| 1229. |
The spectrum of `He^(+)` is expected to be similar to that ofA. NaB. `Li^(+)`C. HD. `Be^(+2)` |
|
Answer» Correct Answer - C Both have one electron (unielectron species ) |
|
| 1230. |
If two litres of aitr is passed repectedly over heated copper and heated `mg` till no further redcution in volume takes place, the volume finally obtained will be approroximately.A. `200 ml`B. `20 ml`C. `0 ml`D. `10 ml` |
|
Answer» Correct Answer - B Air contains `99%O_(2)` and `N_(2)` `2Mg+O_(2)rarrMgO` `3Ng+NrarrMg_(3)N_(2)` Gases adsorbed `=2000xx(9)/(100)=1990` Gases left `2000-1990=10ml`. |
|
| 1231. |
The van der waals forces are the greatest inA. NeonB. ArgonC. kryptonD. Xenon |
|
Answer» Correct Answer - D van der Waals force `mu` size Down the group van der Waals force increases `(HeltNeltArltKrltXe)/(`rarr uarr` van der Waals force)` |
|
| 1232. |
The highest ionization enthalpy is a period is shown byA. Alkali metalsB. Alkaline earth metalsC. HalogensD. Noble gases |
|
Answer» Correct Answer - D Noble gases have the configuration of octet, which is highly stable , hence highest ionisation enthalpy |
|
| 1233. |
Asseration: `O_(3)` has higher boiling point than `O_(2)`. Reason: `O_(3)` is allotrope of oxygenA. If both the asseration and reason are ture and reason is the true explation of the assertion.B. If both the asseration and reason are ture but the reason is not the correct explanation of assertion.C. If the asseration is true but reason is false.D. If asseration is false bit reason is true. |
|
Answer» Correct Answer - B Both statements are true are not related. |
|
| 1234. |
The electron gain enthalpy of noble gas isA. highB. lowC. positive and very highD. negative |
|
Answer» Correct Answer - C They will not accept eletron because of stable `ns^2 np^6` electronic configuration |
|
| 1235. |
The solubility of iodine in water increases in the presence ofA. AlcoholB. ChloroformC. Sodium hydroxideD. Potassium trichloride |
|
Answer» Correct Answer - D Iodine has the least affinity for water and is only slightly soluble in it. However it is dissolved in 10% aqueous solution of Kl due to formation of complex ion i.e. `I_3^-` . `I_2 + Kl hArr Kl_3 or I_2 + I^(-) hArr I_3^(-)` (Complex) |
|
| 1236. |
The solubility of iodine in water is increased byA. boiling the solutionB. adding `NaNO_3`C. adding HI acidD. addition of potassium iodide |
|
Answer» Correct Answer - d |
|
| 1237. |
Copper reacts with hot conc. `H_(2)SO_(4)` to give:A. `H_(2)`B. `SO_(2)`C. `O_(2)`D. none of these |
| Answer» Correct Answer - B | |
| 1238. |
The solubility of iodine in water increases in the presence ofA. AlcoholB. ChloroformC. sodium hydroxideD. potassium iodide |
|
Answer» Correct Answer - D Iodine has the least affinity for water and is only slightly soluble in it. However, it dissolves in `10%aq`. Solution of `KI` due to the formation of a complex ion i.e., `I_(3)^(-)`. `I_(2)+KI hArr KI_(3)` or `I_(2)+I^(-) hArr I_(3)^(-)` (complex ion) |
|
| 1239. |
The most efficient agent for the absorption of `SO_(3)` isA. `80% H_(2)SO_(4)`B. `98%H_(2)SO_(4)`C. `50%H_(2)SO_(4)`D. `20%H_(2)S_(2)O_(7)` |
|
Answer» Correct Answer - B `98%H_(2)SO_(4)` is used for absorbing dense fog of acid which is formed by dissolving `SO_(2)` in water. Hence `98%H_(2)SO_(4)` is the most efficient agent for the absorption of `SO_(30`. |
|
| 1240. |
Carbon reacts with conc. `H_(2)SO_(4)` to givesA. `CO,H_(2)O`B. `SO_(2),H_(2)O,CO`C. `CO_(2),SO_(2),H_(2)O`D. `CO_(2),H_(2)O` |
|
Answer» Correct Answer - C `C+underset("Conc.")(2H_(2)SO_(4))toCO_(2)+2SO_(2)+2H_(2)O` |
|
| 1241. |
Which of the following statements in incorrect ?A. `O_(3)` is used as disinfectantB. `NO_(2)` is oxidised to `N_(2)O_(5)` by `O_(3)`C. `O_(3)^(-)` is paramagnetic in natureD. Dry iodine reacts with ozone and form `I_(2)O_(5)` |
|
Answer» Correct Answer - 4 `{:((1)"Correct statement",,(2)2NO_(2)+O_(3)rarr N_(2)O_(5)+O_(2),,),((3)O_(3)^(-)"is paramagnetic",,(4)2I_(2)+9[O_(3)]rarrI_(4)O_(9)("yellow solid")+(O_(2)),,):}` |
|
| 1242. |
The most efficient agent for the absorption of `SO_(3)` isA. `80%H_(2)SO_(4)`B. `98%H_(2)SO_(4)`C. `50%H_(2)SO_(4)`D. `20%H_(2)SO_(4)` |
|
Answer» Correct Answer - B 90% `H_2SO_4` is used for absorbing dense fog of acid which is formed by dissolving `SO_3` in water . Hence , 98% `H_2SO_(4)` is the most efficient reagent for absorption of `SO_(3)` . |
|
| 1243. |
Sulphuric acid has great affinity for water because itA. acid decomposes waterB. it hydrolyses the acidC. it decomposes the acidD. acid forms hydrates with water |
|
Answer» Correct Answer - D The great affinity of `H_2SO_(4)` for water is because it forms hydrates with water . |
|
| 1244. |
A colourless gas with smell of rotten fish isA. `H_(2)S `B. `PH_(3)`C. `SO_(2)`D. None of these |
|
Answer» Correct Answer - B `H_2S ` has smell of rotten eggs and is produced during decay of organic matter . `SO_12 ` has pungent odour of burning sulphur while phosphine `(PH_3)` has an odour of rotten fish . |
|
| 1245. |
Which of the following compounds gives a mixture of `SO_(2)` and `SO_(3)` on heating ?A. `ZnSO_(4)`B. `Fe_(2)(SO_(4))_(3)`C. `FeSO_(4)`D. `CaSO_(4)` |
|
Answer» Correct Answer - 4 `2FeSO_(4)overset(Delta)rarrFe_(2)O_(3)+SO_(2)+SO_(3)` |
|
| 1246. |
Select the incorrect order .A. `He gt Ar gt Kr gt N e gt Xe-(` abundance in air).B. `He lt N e lt Ar lt Kr lt Xe-(` boiling point ).C. `XeF_(2) gt XeF_(4) gt XeF_(6)-(` melting point )D. `XeF_(6) lt XeF_(4) lt XeF_(2)-(Xe-` F bond length). |
|
Answer» Correct Answer - 1 `(1)ArgtN egtKrgtHegtXe" "(3)XeF_(2)gtXeF_(4)gtXeF_(6)(` on the basis of packing of molecules in the lattice ). |
|
| 1247. |
Oxidation state of oxygen in `F_2O` isA. `+1 `B. `-1 `C. `+2 `D. `-2 ` |
|
Answer» Correct Answer - C Oxidation state of oxygen in `F_2O ` is +2 as fluorine is most electronegative element and exhibits only -1 oxidation state . |
|
| 1248. |
On strong heating lead nitrate gives:A. `PbO,NO_(2),O_(2)`B. `PbO,NO,NO_(2)`C. `PbO_(2),PbO,NO_(2)`D. `PbO,NO,O_(2)` |
|
Answer» Correct Answer - A `Pb(NO_(3))_(2)toPbO+2NO_(2)+1/2O_(2)` |
|
| 1249. |
Noble gases can be separated by:A. passing them through some solutionsB. electrolysis of their compoundsC. adsorption and desorption on cocount charcoalD. none of the above |
|
Answer» Correct Answer - C Coconut charcoal possesses characteristic property for adsorbing different noble gases at different temperature. |
|
| 1250. |
Which oxide of carbon is obtained when `K_(4)[Fe(CN)_(6)]` is warmed with concentrated sulphuric acid ?A. `CO`B. `CO_(2)`C. `C_(3)O_(2)`D. Both `CO` and `CO_(2)` |
|
Answer» Correct Answer - 1 `K_(4)[Fe(CN)_(6)]+6H_(2)SO_(4)+6H_(2)Orarr2K_(2)SO_(4)+FeSO_(4)+3(NH_(4))_(2)SO_(4)+6CO` |
|