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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.
| 851. |
Which is the following metallic oxides exhibit amphoteric nature ?A. `BaO`B. `Al_(2)O_(3)`C. `Na_(2)O`D. `CaO` |
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Answer» Correct Answer - B The oxides of alkali mentals (i.e., `Na_(2)O`) and alkaline earth metals (i.e. , `CaO, BaO`) are distinctly basic but `Al_(2)O_(3)` is ampholeric in character. |
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| 852. |
When conc. `HNO_(3)` is heated with `P_(2)O_(5)`, it formsA. `N_(2)O`B. `NO`C. `NO_(2)`D. `N_(2)O_(5)` |
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Answer» Correct Answer - D `4HNO_(3)+ 2P_(2)O_(5) overset(triangle)to 2N_(2)O_(5)+ 4NPO_(3)` |
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| 853. |
Carbon monooxide is readily absorbed by ammoniacal curpous chloride solution but carbon dioxide is not. Explain . |
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Answer» Due to the presence of a lone pair of electrons on carbon in `CO`, in acts as a Lewis base (or ligand) and and thus forms a soluble complex with ammoniacal curpous chloride solution. `CaCl + NH_(3) + :CO rarr underset("Soluble complex")([Cu(CO)NH_(3)]^(+)) Cl^(-)` On the other hand, `CO_(2)` does not act as a Lewis base since it does not have a lone pair of electrons on the carbon atom and hence does not dissolve in ammoniacal cuprous chloride solution. |
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| 854. |
the bleaching action of chlorine is due toA. reductionB. hydrogenationC. chloronationD. oxidation |
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Answer» Correct Answer - D When chlorine react with water it givs nascent oxygen which bleaches the coloured substances. `H_(2)O + Cl_(2) rarr 2HCl + [O]` Coloured substance ` + [O]rarr "Colourless substance"` |
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| 855. |
Which is used in the laboratory for last drying of neutral gases?A. `P_(2)O_(5)`B. Ahyd. `CaCl_(2)`C. Activated charcoalD. `Na_(3)PO_(4)` |
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Answer» Correct Answer - A `P_(2)O_(5)` absorb moisture, so it is used as a drying agent for neutral gases. |
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| 856. |
Water gas is produced byA. passing steam through a red hot coke bedB. saturing hydrogen with moistureC. mixing oxygen and hydrogen in the ratio of `1 : 2`D. heating a mixture of `CO_(2)` and `CH_(4)` in petroleum refineries |
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Answer» Correct Answer - A Water gas is produced when steam is passes over red hote coke beds. `C(s) + H_(2)O rarr ubrace(CO(g)+H_(2)(g))_("Water gas")` |
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| 857. |
Cane sugar on reaction with nitric acid givesA. `CO_(2)` and `SO_(2)`B. `2HCOOH`C. `(COOH)_(2)`D. no reaction |
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Answer» Correct Answer - C When nitric acid reacts with cane sugar. It forms oxalic acid `underset("Cane sugar")(C_(12)H_(22)O_(11))+underset("nitric acid")underset("From")(18[O])rarr 6 underset("Oxalic Acid")({:(COOH),("|"),(COOH):})+5H_(2)O` |
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| 858. |
concentrared nitric acid oxidises cane sugar toA. `CO_(2)` and `H_(2)O`B. `CO` and `H_(2)O`C. `CO,CO_(2)` and `H_(2)O`D. Oxalic acid and water |
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Answer» Correct Answer - D `C_(12)H_(22)O_(11) overset(conc.HNO_(3))(rarr)overset(COOH)underset(underset("Oxalicacid")(COOH))(|)+H_(2)O` |
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| 859. |
Name the following : most abundant noble gas in atmosphere |
| Answer» Argon is the most abundant noble gas in atmosphere. | |
| 860. |
What products are formed when `H_(3)PO_(2)` is heated at `415 K` and at `435 K` respectively. |
| Answer» Correct Answer - A::B::C::D | |
| 861. |
What is the covaleny of nitrogen in `N_(2)O_(5)` ? |
| Answer» Correct Answer - `5` | |
| 862. |
What happens when phosphoric acid is heated ? |
| Answer» Correct Answer - A::B::C::D | |
| 863. |
`H_(3)PO_(2)` is a good reducing agent - Explain with an example. |
| Answer» In `H_(3)PO_(2)`, two H-atoms are bonded directly to P-atom which imparts reducing character to the acid. | |
| 864. |
What happens when (i) `PCl_(5)` is heated ? (ii) `H_(3)PO_(3)` is heated ? Write the reactions involved . |
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Answer» `(i) PCl_(5) to PCl_(3)+Cl_(2)` (ii) On heating, phosphorus acid disproportionates to give orthophosphoric acid and phosphire. `4H_(3)PO_(3)to3H_(3)PO_(4)+PH_(3)` |
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| 865. |
Write the chemical reactions of `P_(4)O_(6)` with cold and hot water. |
| Answer» Correct Answer - A::B::C::D | |
| 866. |
What happens when white phosphorus is boiled with a strong solution of `NaOH` in moist atmosphere ? |
| Answer» Correct Answer - A::B::C::D | |
| 867. |
Why does `H_(3)PO_(3)` act as a reducing agent but `H_(3)PO_(4)` does not ? |
| Answer» Correct Answer - A::B::C::D | |
| 868. |
Nitrogen shows oxidation state +5, but it does not form pentahalide asA. it is the first number of group 15B. it is a diatomic gasC. it has no d-orbitals so valence shell cannot be expandedD. it has small atomic and ionic radii |
| Answer» Correct Answer - C | |
| 869. |
Which of the following statement is correct?A. Carbon forms oxides which are basic in natureB. Metals can form only acidic oxidesC. Sodium metal is stored under keroseneD. White phosphorus is kept under kerosene to avoid oxidation |
| Answer» Correct Answer - C | |
| 870. |
Write any two uses each for `O_(3)` and `H_(2)SO_(4)`. |
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Answer» Uses of `O_(3)` : `to` Ozone is used in sterilisation of water. `to` Ozone is used in manufacture of artificial silk and camphor etc. `to` Ozone is used to identify unsaturation in carbon compounds. Uses of `H_(2)SO_(4)` : `to H_(2)SO_(4)` is used in the manufacture of fertilisers. `to H_(2)SO_(4)` is used in petrol refining. `to H_(2)SO_(4)` is used in detergent industry. |
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| 871. |
Which form of sulphur shows paramagnetism ? |
| Answer» In vapour state sulphur partly exists as `S_(2)` molecule which has two unpaired electrons in the antibonding `pi(pi^(**))` orbitals like `O_(2)`. Hence exhibits paramagnetism. | |
| 872. |
How is the presence of `SO_(2)` detected ? |
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Answer» `SO_(2)` has a pungent odour. Two tests to detect the presence of `SO_(2)` are as follows : 1. `SO_(2)` decolourises acidified `KMnO_(4)` solution. `5SO_(2)+underset("Violet")(2MnO_(4)^(-))+2H_(2)O to5SO_(4)^(2-)+4H^(+)+underset("Colourless")(2Mn^(2+))` 2. `SO_(2)` Changes the colour of acidified potassium dichromate solution from orange to green. `3SO_(2)+underset("Orange")(Cr_(2)O_(4)^(2-)+2H^(+)to3SO_(4)^(2-)+underset("Green")(2"Cr"^(3+))+H_(2)O` |
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| 873. |
Mention three areas in which `H_(2)SO_(4)` plays an important role. |
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Answer» Uses of sulphuric acid. i) It is used in the manufacture of pigments, paints and dyestuff intermediate. ii) It is used in petroleum refining. iii) it is also used in fertilizer industry. |
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| 874. |
Reaction of `HNO_(3)` with C,P,S and I respectively giveA. `CO,H_(3)PO_(4),H_(2)SO_(4)" and "HIO_(2)`B. `CO_(2),P_(2)O_(5),SO_(2)" and " I_(2)O_(5)`C. `CO_(2),H_(3)PO_(3),H_(2)SO_(3)" and "HIO_(3)`D. `CO_(2),H_(3)PO_(4),H_(2)SO_(4)" and "HIO_(3)` |
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Answer» Correct Answer - D Reaction of `HNO_(3)` with C,P,S and I gives `CO_(2), H_(3)PO_(4) H_(2)SO_(4)` and `HIO_(3)` respectively |
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| 875. |
Of the following compounds the most acidic isA. `As_2O_3`B. `P_2O_3`C. `Sb_2O_3`D. `Bi_2O_3` |
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Answer» Correct Answer - B `P_2O_3` is acidic oxide, all other are basic oxide |
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| 876. |
Which blue liquid is obtained on reacting equimolar amounts of two gases at `-30^@C`?A. `N_2O`B. `N_2O_3`C. `N_2O_4`D. `N_2O_5` |
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Answer» Correct Answer - B `NO_((g)) + NO_(2(g)) overset(-30^@C)to underset"(blue liquid)"(N_2O_3)` |
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| 877. |
The deep blue colour produced on adding excess of ammonia to copper sulphate is due to presence ofA. `Cu (NH_3)_4^(2+)`B. `Cu^(2+)`C. `Cu(NH_3)_2^(2+)`D. `Cu(NH_3)_6^(2+)` |
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Answer» Correct Answer - A `CuSO_4` reacts with excess `NH_3` to form `[Cu(NH_3)_4] (OH)_2` with deep blue colour. |
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| 878. |
Peroxoacids of sulphur areA. `H_(2)S_(2)O_(8)" and "H_(2)SO_(5)`B. `H_(2)S_(2)O_(8)" and "H_(2)S_(2)O_(7)`C. `H_(2)S_(2)O_(7)" and "H_(2)S_(2)O_(6)`D. `H_(2)SO_(5)" and "H_(2)S_(2)O_(7)` |
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Answer» Correct Answer - A Peroxocids of sulphur are `H_(2)S_(2)O_(8)` and `H_(2)SO_(5)`. |
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| 879. |
What is formed when a solution of `NH_(4)NO_(2)` is heated gently ?A. `N_(2)` and `H_(2)O`B. `N_(2)O` and `H_(2)O`C. `NO` and `H_(2)`D. `N_(2),H_(2)` and `O_(2)` |
| Answer» Correct Answer - A | |
| 880. |
What is the first change the occurs when `I_(2)(s)` is heated slowly at one atmosphere pressure?A. The solid meltsB. The solid vapourizesC. The solid breaks into atomsD. The solid becomes darker in colour. |
| Answer» Correct Answer - B | |
| 881. |
Statement-1: `Al(OH)_(3)` is amphoteric in nature. Statement-2: It cannot be used as an antacid.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1.C. Statement-1 is True, Statement-2 is FalseD. Statement-1 is False, Statement-2 is True |
| Answer» Correct Answer - C | |
| 882. |
Which element does not occur as distinct allotropes at temperatures between `O^(@)C` and `150^(@)C`?A. PhosphorousB. SiliconC. SulphurD. Tin |
| Answer» Correct Answer - B | |
| 883. |
How can you synthesize nitric oxide in the laboratory?A. Zinc with cold and dilute `HNO_(3)`B. Zinc with concentracted `HNO_(3)`C. Copper with cold and dilute `HNO_(3)`D. Heating `NH_(4)NO_(3)` |
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Answer» Correct Answer - C `3Cu+8HNO_(3)rarr3Cu(NO_(3))_(2)+4H_(2)O+underset("Nitric Oxide")(2NO)` |
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| 884. |
Tin reacts with dilute nitric acid and produces:A. `NO_(2)`B. NOC. `NH_(4)NO_(3)`D. `N_(2)` |
| Answer» Correct Answer - C | |
| 885. |
Nitrogen dioxide is not produced on heatingA. `KNO_(3)`B. `Pb(NO_(3))_(2)`C. `Cu(NO_(3))_(2)`D. `AgNO_(3)` |
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Answer» Correct Answer - A `KNO_(3)` on heating gives `O_(2)` while all others give `NO_(2)` `2KNO_(3)overset(Delta)to2KNO_(2)+O_(2)` `2Pb(NO_(3))_(2)overset(Delta)to2PbO+4NO_(2)+O_(2)` `2Cu(NO_(3))_(2)overset(Delta)to2CuO+4NO_(2)+O_(2)` `2AgNO_(3)overset(Delta)to2Ag+2NO_(2)+O_(2)` |
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| 886. |
One of the oxidants used with liquid propellant is :A. ammonia perchlorateB. nitrocelluloseC. sulphuric acidD. nitrogen tetraoxide (`N_(2)O_(4`) |
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Answer» Correct Answer - D Nitrogen tetraoxide `(N_(2)O_(4))` is used as an oxidant with liquid fuel in rockets, space vehicles and missiles. |
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| 887. |
Oxidation of `NO` in air producesA. `N_(2)O`B. `N_(2)O_(3)`C. `NO_(2)`D. `N_(2)O_(2)` |
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Answer» Correct Answer - C `2NO+O_(2)rarr2NO_(2)` |
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| 888. |
`NO_(2)` is a mixed oxide is proved by the first that with `NaOH`, it formsA. Nitrites saltB. Nitrates saltC. Mixture of nitrate and nitriteD. Ammonia |
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Answer» Correct Answer - C `2NO_(2)+H_(2)O hArr HNO_(2) +HNO_(3)` When dissolved in water,gives a mixture of nitrous acid and nitric acid. `N_(2)O_(4)+H_(2)OrarrHNO_(2)+HNO_(3)` `HNO_(#)+HNO_(2)+2NaOHrarrNaNO_(2)+NaNO_(3)+2H_(2)O` |
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| 889. |
Give one example each of normal oxide and mixed oxide of nitrogen. |
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Answer» `to` Nitric oxide (NO) is an example of normal oxide of Nigrogen. `to` Dinitrogen trioxide `(N_(2)O_(3))` is an example of mixed oxide of nitrogen. |
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| 890. |
Which among the following is the most reactive gtA. `CI_(2)`B. `Br_(2)`C. `I_(2)`D. `ICI` |
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Answer» Correct Answer - D |
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| 891. |
Which one has highest boiling point ?A. `He`B. `Ne`C. `Kr`D. `Xe` |
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Answer» Correct Answer - D |
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| 892. |
Under ambient condition , the total number of gases released products in the final step of the reaction scheme shown below is |
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Answer» Correct Answer - C |
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| 893. |
How does `BF_(3)` act as a catalyst industrial processes ? |
| Answer» Due to the presence of six electrons in the valence shell, `BF_(3)` acts as a Lewis acid catalyst in Friedel - Crafts reaction and many other industrial process. | |
| 894. |
Tin reacts with concentrated `HNO_(3)` and gives:A. stannic nitrateB. stannous nitrateC. metastannic acidD. none of these |
| Answer» Correct Answer - C | |
| 895. |
`H_(2)S` oxidises in presence of excess oxygen, gives-A. `SO_(2)`B. `SO_(3)`C. `S`D. `H_(2)SO_(4)` |
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Answer» Correct Answer - A `2H_(2)S+3O_(2)rarr2H_(2)O+2SO_(2)` |
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| 896. |
Which of the following reactions depict the oxidising behaviour of `H_(2)SO_(4)`?A. `2PCl_(5)+H_(2)SO_(4) to 2POCl_(3)+2HCl + SO_(2)Cl_(2)`B. `2NaOH + H_(2)SO_(4) to Na_(2)SO_(4) + 2H_(2)O`C. `NaCl + H_(2)SO_(4) to NaHSO_(4) + HCl`D. `2HI + H_(2)SO_(4) to I_(2) +SO_(2) +2H_(2)O` |
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Answer» Correct Answer - D `overset(-1)(2HI)+overset(+6)(H_(2)SO_(4))to overset(0)(I_(2))+overset(+4)(SO_(2))+2H_(2)O` Thus, `H_(2)SO_(4)` oxidises `HI` to `l_(2)` |
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| 897. |
`B(OH)_(3)` isA. Lewis acidB. Lewis baseC. Bronsted baseD. Bronsted acid |
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Answer» Correct Answer - A `B(OH)_(3)` is a Lewis acid. |
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| 898. |
Aluminum is exteracted from alumine `AI_(2)O_(3)` by electrolysis of a molten mixture of :A. `Al_(2)O_(3)+HF+NaAiF_(4)`B. `Al_(2)O_(3)+CaF_(2)NaAIF_(4)`C. `Al_(2)O_(3)+N a_(3)AIF_(6)+CaF_(2)`D. `Al_(2)O_(3)+KF+Na_(3)AIF_(6)` |
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Answer» Correct Answer - C It is the correct answer. |
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| 899. |
The order of solubility of noble gases in water isA. (A)HegtArgtKrgtNegtXeB. (B)HegtNegtArgtKrgtXeC. (C)XegtArgtKrgtHegtNeD. (D)XegtKrgtArgtNegtHe |
| Answer» Correct Answer - D | |
| 900. |
Which one of the following pairs is obtained on heating ammonium dichromate ?A. `N_2 and H_2 O `B. `N_(2)O and H_2O `C. `NO_2 and H_2 O `D. `NO and NO_(2)` |
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Answer» Correct Answer - A Ammonium dichromate on heating gives nitrogen chromic oxide and water . `(NH_(4))_(2)Cr_(2)O_(7) overset(Delta)to N_2+Cr_(2)O_(3)+4H_(2)O` |
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