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.
| 3251. |
Which oxide of nitrogen is coloured gas [IIT 1987; Kurukshetra CEE 1998] |
| A. | \[{{N}_{2}}O\] |
| B. | \[NO\] |
| C. | \[{{N}_{2}}{{O}_{5}}\] |
| D. | \[N{{O}_{2}}\] |
| Answer» E. | |
| 3252. |
Dehydrated phosphorus trichloride in water gives [MP PET 1990] |
| A. | \[HP{{O}_{3}}\] |
| B. | \[{{H}_{3}}P{{O}_{4}}\] |
| C. | \[{{H}_{3}}P{{O}_{2}}\] |
| D. | \[{{H}_{3}}P{{O}_{3}}\] |
| Answer» E. | |
| 3253. |
Which nitrogen trihalides is least basic [IIT 1987; Kurukshetra CEE 1998; CPMT 1999] |
| A. | \[N{{F}_{3}}\] |
| B. | \[NC{{l}_{3}}\] |
| C. | \[NB{{r}_{3}}\] |
| D. | \[N{{I}_{3}}\] |
| Answer» B. \[NC{{l}_{3}}\] | |
| 3254. |
Which of the following is the most suitable drying agent for ammonia gas [MP PMT 1989; CBSE PMT 1989; DPMT 1982; CPMT 1974, 78, 91; BHU 1986, 96; 2001; IIT (Screening) 2000] |
| A. | Calcium oxide |
| B. | Anhydrous calcium chloride |
| C. | Phosporus pentoxide |
| D. | Conc. sulphuric acid |
| Answer» B. Anhydrous calcium chloride | |
| 3255. |
Which oxide is alkaline [MP PET 1990] |
| A. | \[{{P}_{2}}{{O}_{3}}\] |
| B. | \[B{{i}_{2}}{{O}_{3}}\] |
| C. | \[A{{s}_{2}}{{O}_{3}}\] |
| D. | \[{{B}_{2}}{{O}_{3}}\] |
| Answer» C. \[A{{s}_{2}}{{O}_{3}}\] | |
| 3256. |
Which one of the following statements is true for \[HN{{O}_{2}}\] [CPMT 1980, 84] |
| A. | It is very stable in aqueous solution |
| B. | It cannot act both as an oxidant and as a reductant |
| C. | It cannot act as an oxidising agent |
| D. | It cannot act as reducing agent |
| Answer» B. It cannot act both as an oxidant and as a reductant | |
| 3257. |
Nitric acid oxidises phosphorus to [CPMT 1984; JIPMER 2002] |
| A. | \[{{H}_{2}}{{P}_{2}}{{O}_{7}}\] |
| B. | \[{{H}_{3}}P{{O}_{3}}\] |
| C. | \[AgN{{O}_{3}}\] |
| D. | \[NO\] |
| Answer» E. | |
| 3258. |
In the catalytic oxidation of ammonia an oxide is formed which is used in the preparation of \[HN{{O}_{3}}\]. This oxide is [CPMT 1984; KCET 1990; AIIMS 1996] |
| A. | \[{{N}_{2}}{{O}_{5}}\] |
| B. | \[{{N}_{2}}{{O}_{4}}\] |
| C. | \[N{{O}_{2}}\] |
| D. | \[NO\] |
| Answer» E. | |
| 3259. |
If phosphoric acid is allowed to react with sufficient quantity of \[NaOH\], the product obtained is [DPMT 1983; MP PMT 1983] |
| A. | \[NaHP{{O}_{3}}\] |
| B. | \[N{{a}_{2}}HP{{O}_{4}}\] |
| C. | \[Na{{H}_{2}}P{{O}_{4}}\] |
| D. | \[N{{a}_{3}}P{{O}_{4}}\] |
| Answer» E. | |
| 3260. |
Superphosphate of lime is [AMU 1985] |
| A. | A mixture of normal calcium phosphate and gypsum |
| B. | A mixture of primary calcium phosphate and gypsum |
| C. | Normal calcium phosphate |
| D. | Soluble calcium phosphate |
| Answer» C. Normal calcium phosphate | |
| 3261. |
Which of the following metal produces nitrous oxide with dil. \[Zn\] |
| A. | \[Sn\] |
| B. | \[Zn\] |
| C. | \[Cu\] |
| D. | \[Ag\] |
| Answer» C. \[Cu\] | |
| 3262. |
\[N{{O}_{2}}\] is a mixed oxide is proved by the first that with \[NaOH\], it forms |
| A. | Nitrites salt |
| B. | Nitrates salt |
| C. | Mixture of nitrate and nitrite |
| D. | Ammonia |
| Answer» D. Ammonia | |
| 3263. |
Metaphosphoric acid has the formula [CPMT 1973, 89, 93] |
| A. | \[{{H}_{3}}P{{O}_{4}}\] |
| B. | \[HP{{O}_{3}}\] |
| C. | \[{{H}_{2}}P{{O}_{3}}\] |
| D. | \[{{H}_{3}}P{{O}_{2}}\] |
| Answer» C. \[{{H}_{2}}P{{O}_{3}}\] | |
| 3264. |
Which of the following represents laughing gas [CPMT 1986, 89; Manipal MEE 1995;MP PMT 1990; MP PET 1995; RPMT 1999; AFMC 2002] |
| A. | \[NO\] |
| B. | \[{{N}_{2}}O\] |
| C. | \[N{{O}_{2}}\] |
| D. | \[{{N}_{2}}{{O}_{3}}\] |
| Answer» C. \[N{{O}_{2}}\] | |
| 3265. |
Nitrous oxide |
| A. | Is a mixed oxide |
| B. | Is an acidic oxide |
| C. | Is highly soluble in hot water |
| D. | Supports the combustion of sulphur |
| Answer» E. | |
| 3266. |
The important method for the fixation of nitrogen is [CPMT 1985, 94] |
| A. | Haber |
| B. | Solvay |
| C. | Deacon |
| D. | Fischer method |
| Answer» B. Solvay | |
| 3267. |
Which of the following is oxidised in air [AFMC 1987; KCET 1991] |
| A. | White phosphorus |
| B. | \[C{{H}_{4}}\] |
| C. | \[{{H}_{2}}O\] |
| D. | \[NaCl\] |
| Answer» B. \[C{{H}_{4}}\] | |
| 3268. |
Among the members of V A group (N, P, As, Sb and Bi), which of the following properties shows an increase as we go down from nitrogen to bismuth [CPMT 1982] |
| A. | Stability of +3 oxidation state |
| B. | Reducing character of hydrides |
| C. | Electronegativity |
| D. | Acidic nature of the pentoxide |
| Answer» B. Reducing character of hydrides | |
| 3269. |
A solution of ammonia in water contains [CBSE PMT 1991] |
| A. | \[{{H}^{+}}\] |
| B. | \[O{{H}^{-}}\] |
| C. | Only \[NH_{4}^{+}\] |
| D. | \[O{{H}^{-}},\] \[N{{H}_{4}}N{{O}_{2}}\] and \[N{{H}_{4}}OH\] molecules |
| Answer» E. | |
| 3270. |
The element which catches fire in air at \[{{30}^{o}}C\] and is stored under water is [BHU 1973; MP PET 1989,99] |
| A. | Calcium |
| B. | Sodium |
| C. | Phosphorus |
| D. | Zinc |
| Answer» D. Zinc | |
| 3271. |
When concentrated nitric acid is heated, it decomposes to give [BHU 1973; CPMT 1996] |
| A. | \[{{O}_{2}}\] and \[{{N}_{2}}\] |
| B. | \[NO\] |
| C. | \[{{N}_{2}}{{O}_{5}}\] |
| D. | \[N{{O}_{2}}\] and \[{{O}_{2}}\] |
| Answer» E. | |
| 3272. |
Ammonium dichromate on heating gives [BHU 1973, 78; CBSE PMT 1993; MP PMT 1993] |
| A. | Chromium oxide and ammonia |
| B. | Chromic acid and nitrogen |
| C. | Chromium oxide and nitrogen |
| D. | Chromic acid and ammonia |
| Answer» D. Chromic acid and ammonia | |
| 3273. |
Which one of the following combines with \[Fe(II)\] ions to form a brown complex [AIIMS 1982, 83, 87; BHU 1998; CBSE PMT 2000; Pb. PMT 2000; AFMC 1988, 92; MP PET 1997, 2000, 01] |
| A. | \[{{N}_{2}}O\] |
| B. | \[NO\] |
| C. | \[{{N}_{2}}{{O}_{3}}\] |
| D. | \[{{N}_{2}}{{O}_{5}}\] |
| Answer» C. \[{{N}_{2}}{{O}_{3}}\] | |
| 3274. |
Nitrogen forms how many oxides |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» D. 6 | |
| 3275. |
Phosphorus is manufactured by heating in a electric furnace a mixture of NCERT 1977; CPMT 1974, 78, 81, 86] |
| A. | Bone ash and coke |
| B. | Bone ash and silica |
| C. | Bone ash, silica and coke |
| D. | None of these |
| Answer» D. None of these | |
| 3276. |
Dissociation of \[{{H}_{3}}P{{O}_{4}}\] occurs in following stages [CPMT 1976] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 3277. |
When plants and animals decay, the organic nitrogen is converted into inorganic nitrogen. The inorganic nitrogen is in the form of [KCET 2005] |
| A. | Ammonia |
| B. | Elements of nitrogen |
| C. | Nitrates |
| D. | Nitrides |
| Answer» B. Elements of nitrogen | |
| 3278. |
Which of the following oxide of nitrogen is the anhydride of \[HN{{O}_{3}}\] [CPMT 1979,80,89,97; MP PET/PMT 1988; KCET 1991; CBSE PMT 1989, 91,99; EAMCET 1991; NCERT 1975; MP PET 1989; MP PMT 1994] |
| A. | \[NO\] |
| B. | \[{{N}_{2}}{{O}_{3}}\] |
| C. | \[{{N}_{3}}{{O}_{4}}\] |
| D. | \[{{N}_{2}}{{O}_{5}}\] |
| Answer» E. | |
| 3279. |
In the electrothermal process, the compound displaced by silica from calcium phosphate is [KCET 2004] |
| A. | Calcium |
| B. | Phosphine |
| C. | Phosphorus |
| D. | Phosphorus pentoxide |
| Answer» E. | |
| 3280. |
Which of the following is a mixed anhydride [Pb. CET 2003] |
| A. | \[NO\] |
| B. | \[N{{O}_{2}}\] |
| C. | \[{{N}_{2}}{{O}_{5}}\] |
| D. | \[{{N}_{2}}O\] |
| Answer» C. \[{{N}_{2}}{{O}_{5}}\] | |
| 3281. |
Most acidic oxide is [Pb. CET 2004] |
| A. | \[N{{a}_{2}}O\] |
| B. | \[ZnO\] |
| C. | MgO |
| D. | \[{{P}_{2}}{{O}_{5}}\] |
| Answer» E. | |
| 3282. |
Number of \[P-O\]bonds in \[{{P}_{4}}{{O}_{10}}\]is [DCE 2002] |
| A. | 17 |
| B. | 16 |
| C. | 15 |
| D. | 6 |
| Answer» C. 15 | |
| 3283. |
Which of the following compound show sublimation [AFMC 1995; Pb. CET 2000] |
| A. | \[N{{H}_{4}}Cl\] |
| B. | \[CaC{{O}_{3}}\] |
| C. | \[BaS{{O}_{4}}\] |
| D. | \[CaHP{{O}_{3}}\] |
| Answer» B. \[CaC{{O}_{3}}\] | |
| 3284. |
Which of the following halides is most acidic [MP PMT 2004] |
| A. | \[PC{{l}_{3}}\] |
| B. | \[BiC{{l}_{3}}\] |
| C. | \[SbC{{l}_{3}}\] |
| D. | \[CC{{l}_{4}}\] |
| Answer» B. \[BiC{{l}_{3}}\] | |
| 3285. |
The boiling points of the following hydrides follow the order of [DPMT 2004] |
| A. | \[N{{H}_{3}}>As{{H}_{3}}>P{{H}_{3}}>Sb{{H}_{3}}\] |
| B. | \[Sb{{H}_{3}}>As{{H}_{3}}>P{{H}_{3}}>N{{H}_{3}}\] |
| C. | \[Sb{{H}_{3}}>N{{H}_{3}}>As{{H}_{3}}>P{{H}_{3}}\] |
| D. | \[N{{H}_{3}}>P{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}\] |
| Answer» D. \[N{{H}_{3}}>P{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}\] | |
| 3286. |
\[{{(N{{H}_{4}})}_{2}}C{{r}_{2}}{{O}_{7}}\] on heating liberates a gas. The same gas will be obtained by [IIT JEE (Screening) 2004; BVP 2004] |
| A. | Heating \[N{{H}_{4}}N{{O}_{2}}\] |
| B. | Heating \[N{{H}_{4}}N{{O}_{3}}\] |
| C. | Treating \[{{H}_{2}}{{O}_{2}}\] with \[NaN{{O}_{2}}\] |
| D. | Treating \[M{{g}_{3}}{{N}_{2}}\] with \[{{H}_{2}}O\] |
| Answer» B. Heating \[N{{H}_{4}}N{{O}_{3}}\] | |
| 3287. |
Which is the most thermodynamically stable allotropic form of phosphorus [IIT-JEE (Screening) 2005] |
| A. | Red |
| B. | White |
| C. | Black |
| D. | Yellow |
| Answer» D. Yellow | |
| 3288. |
On heating a mixture of \[N{{H}_{4}}Cl\]and\[KN{{O}_{2}}\] we get [CPMT 1972, 79; NCERT 1977] |
| A. | \[N{{H}_{4}}N{{O}_{3}}\] |
| B. | \[{{N}_{2}}\] |
| C. | \[{{N}_{2}}O\] |
| D. | \[NO\] |
| Answer» C. \[{{N}_{2}}O\] | |
| 3289. |
The number of hydrogen atom (s) attached to phosphorus atom in hypophosphorous acid is [AIEEE 2005] |
| A. | Zero |
| B. | Two |
| C. | One |
| D. | Three |
| Answer» C. One | |
| 3290. |
In the reaction \[HN{{O}_{3}}+{{P}_{4}}{{O}_{10}}\to 4HP{{O}_{3}}+x\], the product x is [MH CET 2003; DPMT 2004] |
| A. | \[{{N}_{2}}{{O}_{3}}\] |
| B. | \[{{N}_{2}}{{O}_{5}}\] |
| C. | \[N{{O}_{2}}\] |
| D. | \[{{H}_{2}}O\] |
| Answer» C. \[N{{O}_{2}}\] | |
| 3291. |
When lead nitrate is heated, it gives [MH CET 2003] |
| A. | \[N{{O}_{2}}\] |
| B. | \[NO\] |
| C. | \[{{N}_{2}}{{O}_{5}}\] |
| D. | \[{{N}_{2}}O\] |
| Answer» B. \[NO\] | |
| 3292. |
Nitrous oxide is known as [AFMC 2004] |
| A. | Breathing gas |
| B. | Laughing gas |
| C. | exercising gas |
| D. | Laboratory gas |
| Answer» C. exercising gas | |
| 3293. |
Bone black is a polymorphic form of [DCE 2003] |
| A. | Phosphorus |
| B. | Sulphur |
| C. | Carbon |
| D. | Nitrogen |
| Answer» B. Sulphur | |
| 3294. |
Which of the following oxy acids of phosphorus is a reducing agent and monobasic [DCE 2004] |
| A. | \[{{H}_{3}}P{{O}_{2}}\] |
| B. | \[{{H}_{3}}P{{O}_{3}}\] |
| C. | \[{{H}_{3}}P{{O}_{4}}\] |
| D. | \[{{H}_{4}}{{P}_{2}}{{O}_{6}}\] |
| Answer» B. \[{{H}_{3}}P{{O}_{3}}\] | |
| 3295. |
An element (X) forms compounds of the formula \[XC{{l}_{3}},\] \[{{X}_{2}}{{O}_{5}}\] and \[C{{a}_{3}}{{X}_{2}},\] but does not form \[XC{{l}_{5}}\], which of the following is the element \[X\] [MP PET 1997] |
| A. | \[B\] |
| B. | \[Al\] |
| C. | \[N\] |
| D. | \[P\] |
| Answer» D. \[P\] | |
| 3296. |
Non-combustible hydride is [CPMT 1979] |
| A. | \[N{{H}_{3}}\] |
| B. | \[P{{H}_{3}}\] |
| C. | \[As{{H}_{3}}\] |
| D. | \[Sb{{H}_{3}}\] |
| Answer» B. \[P{{H}_{3}}\] | |
| 3297. |
In the nitrogen family the \[H-M-H\] bond angle in the hydrides \[M{{H}_{3}}\] gradually becomes closer to \[{{90}^{o}}\] on going from N to Sb. This shows that gradually [MP PET/PMT 1998; MP PMT 2000] |
| A. | The basic strength of hydrides increases |
| B. | Almost pure p-orbitals are used for \[M-H\] bonding |
| C. | The bond energies of \[M-H\] bond increase |
| D. | The bond pairs of electrons become nearer to the central atom |
| Answer» E. | |
| 3298. |
Which of the following elements forms a strongly acidic oxide |
| A. | \[P\] |
| B. | \[As\] |
| C. | \[Sb\] |
| D. | \[Bi\] |
| Answer» B. \[As\] | |
| 3299. |
Orthophosphoric acid represents the molaysis condition due to [CPMT 1993] |
| A. | Hydrogen bonding |
| B. | Phosphorous group |
| C. | Maximum oxygen group |
| D. | Tribasicity |
| Answer» C. Maximum oxygen group | |
| 3300. |
Ammonia on reaction with hypochlorite anion, can form [IIT-JEE 1999] |
| A. | \[NO\] |
| B. | \[N{{H}_{4}}Cl\] |
| C. | \[{{N}_{2}}{{H}_{4}}\] |
| D. | \[HN{{O}_{2}}\] |
| Answer» C. \[{{N}_{2}}{{H}_{4}}\] | |