MCQOPTIONS
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MCQOPTIONS
This section includes 11242 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 10251. |
Which of the following is acidic [AFMC 1990; JIPMER 1997] |
| A. | \[S{{O}_{3}}\] |
| B. | \[{{N}_{2}}O\] |
| C. | \[BeO\] |
| D. | \[HgO\] |
| Answer» B. \[{{N}_{2}}O\] | |
| 10252. |
Which of the following is oxidised by \[S{{O}_{2}}\] [BHU 1986] |
| A. | \[Mg\] |
| B. | \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] |
| C. | \[KMn{{O}_{4}}\] |
| D. | All of these |
| Answer» B. \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] | |
| 10253. |
Which of the following is used to absorb sulphur dioxide [EAMCET 1980] |
| A. | Conc. \[{{H}_{2}}S{{O}_{4}}\] |
| B. | \[KOH\] solution |
| C. | Water |
| D. | Anhydrous \[CaC{{l}_{2}}\] |
| Answer» C. Water | |
| 10254. |
The formula of ozone is \[{{O}_{3}},\] it is [CPMT 1989, 91; Manipal MEE 1995; RPET 1999, 2000] |
| A. | An allotrope of oxygen |
| B. | Compound of oxygen |
| C. | Isotope of oxygen |
| D. | None of these |
| Answer» B. Compound of oxygen | |
| 10255. |
Bond angle is minimum for [DPMT 1990] |
| A. | \[{{H}_{2}}O\] |
| B. | \[{{H}_{2}}S\] |
| C. | \[{{H}_{2}}Se\] |
| D. | \[{{H}_{2}}Te\] |
| Answer» E. | |
| 10256. |
Bleaching action of \[S{{O}_{2}}\] is due to its [CPMT 2004] |
| A. | Oxidising property |
| B. | Acidic property |
| C. | Basic property |
| D. | Reducing property |
| Answer» E. | |
| 10257. |
The oxidation number of xenon in \[XeO{{F}_{2}}\] is [J & K 2005] |
| A. | Zero |
| B. | 2 |
| C. | 4 |
| D. | 3 |
| Answer» D. 3 | |
| 10258. |
Helium was discovered by |
| A. | Crooks |
| B. | Rutherford |
| C. | Frankland and Lockyer |
| D. | Dorn |
| Answer» D. Dorn | |
| 10259. |
Which of the following exhibits the weakest intermolecular forces [KCET (Med.) 2001] |
| A. | He |
| B. | HCl |
| C. | \[N{{H}_{3}}\] |
| D. | \[{{H}_{2}}O\] |
| Answer» B. HCl | |
| 10260. |
Percentage of \[Ar\] in air is about [CPMT 1989] |
| A. | 0.01 |
| B. | 0.02 |
| C. | 0.03 |
| D. | 0.04 |
| Answer» B. 0.02 | |
| 10261. |
Gradual addition of electronic shells in the noble gases causes a decrease in their [MP PET 1997] |
| A. | Ionization energy |
| B. | Atomic radius |
| C. | Boiling point |
| D. | Density |
| Answer» B. Atomic radius | |
| 10262. |
The forces acting between noble gas atoms are [NCERT 1989] |
| A. | Vander Waals forces |
| B. | Ion-dipole forces |
| C. | London dispersion forces |
| D. | Magnetic forces |
| Answer» B. Ion-dipole forces | |
| 10263. |
\[Xe{{F}_{4}}\] on partial hydrolysis produces [AFMC 1995] |
| A. | \[Xe{{F}_{2}}\] |
| B. | \[XeO{{F}_{2}}\] |
| C. | \[XeO{{F}_{4}}\] |
| D. | \[Xe{{O}_{3}}\] |
| Answer» C. \[XeO{{F}_{4}}\] | |
| 10264. |
The last orbit of argon would have electrons [CPMT 1971, 78] |
| A. | 6 |
| B. | 2 |
| C. | 18 |
| D. | 8 |
| Answer» E. | |
| 10265. |
Oxidation of \[NO\] in air produces [KCET 1992] |
| A. | \[{{N}_{2}}O\] |
| B. | \[{{N}_{2}}{{O}_{3}}\] |
| C. | \[N{{O}_{2}}\] |
| D. | \[{{N}_{2}}{{O}_{5}}\] |
| Answer» D. \[{{N}_{2}}{{O}_{5}}\] | |
| 10266. |
Which of the following is not known [MP PET/PMT 1988; NCERT 1982; CBSE PMT 1989; MP PET 1993] |
| A. | \[NC{{l}_{5}}\] |
| B. | \[N{{I}_{3}}\] |
| C. | \[SbC{{l}_{3}}\] |
| D. | \[NC{{l}_{3}}\] |
| Answer» B. \[N{{I}_{3}}\] | |
| 10267. |
Nitrogen combines with metals to form [CPMT 1981, 93] |
| A. | Nitrites |
| B. | Nitrates |
| C. | Nitrosyl chloride |
| D. | Nitrides |
| Answer» E. | |
| 10268. |
Which of the following oxides of nitrogen is the anhydride of nitrous acid [NCERT 1975; AIIMS 1991] |
| A. | \[NO\] |
| B. | \[{{N}_{2}}{{O}_{3}}\] |
| C. | \[{{N}_{2}}{{O}_{4}}\] |
| D. | \[{{N}_{2}}{{O}_{5}}\] |
| Answer» C. \[{{N}_{2}}{{O}_{4}}\] | |
| 10269. |
The strongest base is [IIT 1989; CPMT 1997; MP PET 2001,03] |
| A. | \[N{{H}_{3}}\] |
| B. | \[P{{H}_{3}}\] |
| C. | \[As{{H}_{3}}\] |
| D. | \[Sb{{H}_{3}}\] |
| Answer» B. \[P{{H}_{3}}\] | |
| 10270. |
Which one of the following elements occur free in nature [CPMT 1988] |
| A. | Nitrogen |
| B. | Phosphorus |
| C. | Arsenic |
| D. | Antimony |
| Answer» B. Phosphorus | |
| 10271. |
Which of the following is kept in water? [BCECE 2005] |
| A. | White phosphorous |
| B. | Sodium |
| C. | Potassium |
| D. | Calcium |
| Answer» B. Sodium | |
| 10272. |
Which is used in the manufacture of safe matchsticks [DPMT 1982, CPMT 1974, 75] |
| A. | White phosphorus |
| B. | Sulphur |
| C. | Red phosphorus |
| D. | Selenium |
| Answer» D. Selenium | |
| 10273. |
In \[N{{H}_{4}}N{{O}_{2}},\] the oxidation number of nitrogen will be [MP PET 1990] |
| A. | 3 |
| B. | 5 |
| C. | - 3 and + 3 |
| D. | + 3 and + 5 |
| Answer» D. + 3 and + 5 | |
| 10274. |
White phosphorus contains [CPMT 1978; KCET (Med.) 2000; MP PET 1990] |
| A. | \[{{P}_{5}}\] molecules |
| B. | \[{{P}_{4}}\] molecules |
| C. | \[{{P}_{6}}\] molecules |
| D. | \[{{P}_{2}}\] molecules |
| Answer» C. \[{{P}_{6}}\] molecules | |
| 10275. |
A pure sample of nitrogen is prepared by heating |
| A. | Calcium cyanamide |
| B. | Barium azide |
| C. | Ammonium hydroxide |
| D. | Ammonium nitrite |
| Answer» C. Ammonium hydroxide | |
| 10276. |
The P-P-P bond angle in white phosphorus is [MP PET 1991] |
| A. | \[{{120}^{o}}\] |
| B. | \[{{109}^{o}}2{8}'\] |
| C. | \[{{90}^{o}}\] |
| D. | \[{{60}^{o}}\] |
| Answer» E. | |
| 10277. |
Oxidation number of As in \[{{H}_{2}}AsO_{4}^{-}\] is [CPMT 2001] |
| A. | 6 |
| B. | 7 |
| C. | 5 |
| D. | 9 |
| Answer» D. 9 | |
| 10278. |
The element which forms oxides in all oxidation states \[+I\] to \[+V\] is [AIIMS 2004] |
| A. | N |
| B. | P |
| C. | As |
| D. | Sb |
| Answer» B. P | |
| 10279. |
Which blue liquid is obtained on reacting equimolar amounts of two gases at \[-30{}^\circ C\] [IIT-JEE (Screening) 2005] |
| A. | \[{{N}_{2}}O\] |
| B. | \[{{N}_{2}}{{O}_{3}}\] |
| C. | \[{{N}_{2}}{{O}_{4}}\] |
| D. | \[{{N}_{2}}{{O}_{5}}\] |
| Answer» C. \[{{N}_{2}}{{O}_{4}}\] | |
| 10280. |
Nitrous oxide is known as [AFMC 2004] |
| A. | Breathing gas |
| B. | Laughing gas |
| C. | exercising gas |
| D. | Laboratory gas |
| Answer» C. exercising gas | |
| 10281. |
Which of the following tendencies remains unchanged on going down in the nitrogen family (Group-VA)? [MP PMT 1997] |
| A. | Highest oxidation state |
| B. | Non-metallic character |
| C. | Stability of hydrides |
| D. | Physical state |
| Answer» B. Non-metallic character | |
| 10282. |
On heating ammonium dichromate, the gas evolved is [IIT-JEE 1999] |
| A. | Oxygen |
| B. | Ammonia |
| C. | Nitrous oxide |
| D. | Nitrogen |
| Answer» E. | |
| 10283. |
When heated \[N{{H}_{3}}\] is passed over \[CuO\] gas evolved is [BCECE 2005] |
| A. | \[{{N}_{2}}\] |
| B. | \[{{N}_{2}}O\] |
| C. | \[HN{{O}_{3}}\] |
| D. | \[N{{O}_{2}}\] |
| Answer» B. \[{{N}_{2}}O\] | |
| 10284. |
The acid which forms two series of salts is [KCET 1996] |
| A. | \[{{H}_{3}}P{{O}_{4}}\] |
| B. | \[{{H}_{3}}P{{O}_{3}}\] |
| C. | \[{{H}_{3}}B{{O}_{3}}\] |
| D. | \[{{H}_{3}}P{{O}_{2}}\] |
| Answer» C. \[{{H}_{3}}B{{O}_{3}}\] | |
| 10285. |
The number of \[P-O-P\] bonds in cyclic metaphosphoric acid is [IIT-JEE (Screening) 2000] |
| A. | Zero |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» D. Four | |
| 10286. |
The basicity of orthophosphoric acid is [CPMT 1984, 91] |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 10287. |
Inertness of \[{{N}_{2}}\] gas is due to [DCE 2000; MP PET 2001] |
| A. | No vacant d-orbital |
| B. | High dissociation energy |
| C. | High electronegativity |
| D. | None |
| Answer» C. High electronegativity | |
| 10288. |
The number of \[P-O-P\] bridges in the structure of phosphorous pentoxide and phosphorous trioxide are respectively [AIIMS 2005] |
| A. | 6, 6 |
| B. | 5, 5 |
| C. | 5, 6 |
| D. | 6, 5 |
| Answer» B. 5, 5 | |
| 10289. |
\[SO_{4}^{2-}\] is not used with to dry \[N{{H}_{3}}\]gas because [KCET 2001] |
| A. | \[{{P}_{4}}{{O}_{10}}\] is basic and \[N{{H}_{3}}\] is acidic |
| B. | \[{{P}_{4}}{{O}_{10}}\] is acidic and \[N{{H}_{3}}\]is basic |
| C. | \[{{P}_{4}}{{O}_{10}}\] is not a drying agent |
| D. | \[{{P}_{4}}{{O}_{10}}\] reacts with moisture in \[N{{H}_{3}}\] |
| Answer» C. \[{{P}_{4}}{{O}_{10}}\] is not a drying agent | |
| 10290. |
Action of concentrated nitric acid \[(HN{{O}_{3}})\] on metallic tin produces [BHU 2002] |
| A. | Stannic nitrate |
| B. | Stannous nitrate |
| C. | Stannous nitrite |
| D. | Meta stannic acid |
| Answer» B. Stannous nitrate | |
| 10291. |
When ammonia is passed over heated copper oxide, the metallic copper is obtained. the reaction shows that ammonia is [MP PET 2002] |
| A. | A dehydrating agent |
| B. | An oxidising agent |
| C. | A reducing agent |
| D. | A nitrating agent |
| Answer» D. A nitrating agent | |
| 10292. |
In the reaction, \[{{P}_{2}}{{O}_{5}}+3CaO\to C{{a}_{3}}{{(P{{O}_{4}})}_{2}};\,{{P}_{2}}{{O}_{5}}\] acts as...... [Orissa JEE 2002] |
| A. | Acidic flux |
| B. | Basic flux |
| C. | Basic impurity |
| D. | Acidic impurity |
| Answer» E. | |
| 10293. |
The oxyacid of phosphorus, in which phosphorus has the lowest oxidation state, is [KCET (Med.) 2001] |
| A. | Hypophosphorus acid |
| B. | Orthophosphoric acid |
| C. | Pyrophosphoric acid |
| D. | Metaphosphoric acid |
| Answer» B. Orthophosphoric acid | |
| 10294. |
Calcium cyanamide on treatment with steam under pressure gives ammonia and [EAMCET 1984, 88; CPMT 1986] |
| A. | Calcium carbonate |
| B. | Calcium hydroxide |
| C. | Calcium oxide |
| D. | Calcium bicarbonate |
| Answer» B. Calcium hydroxide | |
| 10295. |
Which statement is wrong for \[NO\] [DPMT 2005] |
| A. | It is anhydride of nitrous acid |
| B. | Its dipole moment in 0.22 D |
| C. | It forms dimer |
| D. | it is paramagnetic |
| Answer» B. Its dipole moment in 0.22 D | |
| 10296. |
There is very little difference in acid strength in the series \[{{H}_{3}}P{{O}_{4}},\] \[{{H}_{3}}P{{O}_{3}},\] and \[{{H}_{3}}P{{O}_{2}}\] because [KCET 1990] |
| A. | Phosphorus in these acids exists in different oxidation states |
| B. | The hydrogen in these acids are not all bounded to the phosphorus |
| C. | Phosphorus is not a highly electronegative element |
| D. | Phosphorus oxides are less basic |
| Answer» C. Phosphorus is not a highly electronegative element | |
| 10297. |
Hypophosphorus acid is [NCERT 1977; MP PMT 1992] |
| A. | A tribasic acid |
| B. | A dibasic acid |
| C. | A monobasic acid |
| D. | Not acidic at all |
| Answer» D. Not acidic at all | |
| 10298. |
White phosphorus reacts with caustic soda. The products are \[P{{H}_{3}}\] and \[Na{{H}_{2}}P{{O}_{2}}\]. This reaction is an example of [IIT 1980; KCET 1993] |
| A. | Oxidation |
| B. | Reduction |
| C. | Oxidation and reduction |
| D. | Neutralisation |
| Answer» D. Neutralisation | |
| 10299. |
The chemical used for cooling in refrigeration is [CPMT 1981, 88] |
| A. | \[C{{O}_{2}}\] |
| B. | \[N{{H}_{4}}OH\] |
| C. | \[N{{H}_{4}}Cl\] |
| D. | Liquid \[N{{H}_{3}}\] |
| Answer» E. | |
| 10300. |
Which of the following elements does not form stable diatomic molecules [CBSE PMT 1989, 94] |
| A. | Iodine |
| B. | Phosphorus |
| C. | Nitrogen |
| D. | Oxygen |
| Answer» C. Nitrogen | |