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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.
| 1901. |
The gases respectively absorbed by alkaline pyrogallon and oil of cinnamon is.A. `O_(2),O_(3)`B. `SO_(2),O_(3)`C. `O_(3), CH_(4)`D. `N_(2)O, O_(3)` |
| Answer» Correct Answer - A | |
| 1902. |
By passing `H_(2)S` in acidified `KMnO_(4)` solution we getA. `K_(2)SO_(3)`B. `MnO_(2)`C. `KHSO_(3)`D. Sulphur |
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Answer» Correct Answer - D `2KMnO_(4)+3H_(2)SO_(4)+5H_(2)SrarrK_(2)SO_(4)+2MnSO_(4)+8H_(2)O+5S` |
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| 1903. |
When `H_(2)S` is passed through nitric acid and acidified `KMnO_(4)` solution the product formed isA. `H_(2)SO_(4)`B. colloidal sulpherC. `SO_(2)`D. plastic sulpher |
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Answer» Correct Answer - B `H_(2)S` acts as strong reducing agent nitric acid and accidified `KMnO_(4)` `2HNO_(3)+H_(2)S to 2H_(2)O+NO_(2)+S`. |
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| 1904. |
The aqeous solution of hydrogen peroxide:A. converts blue litmus pinkB. converts blue litmus whiteC. converts red litmus blueD. None of these |
| Answer» Correct Answer - B | |
| 1905. |
Which of the following is oxidised by `O_(3)?`A. `K_(2)MnO_(4)`B. `Fe_(2)(SO_(4))_(3)`C. `KMnO_(4)`D. `K_(2)Cr_(2)O_(7)` |
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Answer» Correct Answer - A Mn is in +6 oxidation state and can be oxidised to +7, remaining salts can not be oxidised as central atoms are in their highest oxidation states. |
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| 1906. |
How is ozone prepared ? How does it react with the following ? Ag |
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Answer» Preparation of Ozone : A slow dry stream of oxygen under silent electric discharge to form ozone (about `10%`) The product obtained is known as ozonised oxygen. `3O_(2)to2O_(3) DeltaH^(@)=142"kJ"//"mole"` `to` The formation of ozone is an endothermic reaction. `to` It is necessary to use silent electric discharge in the preparation of `O_(3)` to prevent its decomposition Reaction with Ag : Ag metal oxidised to `Ag_(2)O` (Ag metal is tarnished). `2Ag+O_(3)toAg_(2)O+O_(2)` |
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| 1907. |
Alkaline `KI`is oxidised by ozone to :A. potassium iodateB. potassium periodateC. both (A) and (B)D. None of these |
| Answer» Correct Answer - C | |
| 1908. |
How is ozone prepared ? How does it react with the following ? KI |
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Answer» Preparation of Ozone : A slow dry stream of oxygen under silent electric discharge to form ozone (about `10%`) The product obtained is known as ozonised oxygen. `3O_(2)to2O_(3) DeltaH^(@)=142"kJ"//"mole"` `to` The formation of ozone is an endothermic reaction. `to` It is necessary to use silent electric discharge in the preparation of `O_(3)` to prevent its decomposition Reaction with KI : Moist KI is oxidised to Iodine in presence of ozone. `2KI+H_(2)O+O_(3)to2KOH+I_(2)+O_(2)` |
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| 1909. |
When plants and animals decay , the organic nitrogen is converted into inorganic nitrogen. The inorganic nitrogen is in the form ofA. ammoniaB. elements of nitrogenC. nitratesD. nitrides |
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Answer» Correct Answer - A The inorganic nitrogen exists in the form of ammonia . |
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| 1910. |
Nausadar isA. `NH_(4)NO_(3)`B. `NH_(4)Cl`C. `(NH_(4))_(2)SO_(4)`D. `NH_(4)OH ` |
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Answer» Correct Answer - B `NH_4Cl ` is called nausadar . It is used in dry cell. |
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| 1911. |
`H_(2)C_(2)O_(4)overset(triangle)to"gas"(A)+"gas"(B)+"liquid"(C)`. Gas(A) burns with a blue flame and is oxidised to gas(B). `"Gas"(A)+Cl_(2)toDtooverset(NH_(3),triangle)toE` A,B,C and E areA. `CO_(2),CO,H_(2)O,HCONH_(2)`B. `CO,CO_(2),COCl_(2),HCONH_(2)`C. `CO,CO_(2),H_(2)O,NH_(2)CONH_(2)`D. `CO,CO_(2),H_(2)O,COCl_(2)` |
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Answer» Correct Answer - C `H_(2)C_(2)O_(4)overset(triangle)to"gas"(A)CO+"gas"(B)CO_(2)+"liquid"(C)H_(2)O`.CO burns with a blue flame and is oxidised to `CO_(2)` `CO+Cl_(2)toCOCl_(2)overset(NH_(3),triangle)toNH_(2)CONH_(2)` |
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| 1912. |
Which of the following has the highest proton affinity ?A. Arsine `(AsH_3)`B. Stibine `(SbH_(3))`C. Ammonia `(NH_(3)) `D. Phosphine `(PH_(3))` |
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Answer» Correct Answer - C Ammonia has the highest proton affinity . `NH_(3)+H^(+) to NH_(4)^(+)` |
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| 1913. |
Nitriogen dioxide is released by heatingA. `Ph(NO_(3))_(2)`B. `KNO_(3)`C. `NaNO_(2)`D. `NaNO_(3)` |
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Answer» Correct Answer - A `2Pb(NO_(3))_(2)rarr2PbO+4NO_(2)+O_(2)` |
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| 1914. |
Which statement is not correct for nitrogen?A. It has a small sizeB. It does not readily react with `O_(2)`C. It is a typical non-metalD. `d`-orbitals are available for bonding |
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Answer» Correct Answer - D `N_(7)rarr1s^(2),2s^(2),2p^(3)` `d`-orbitals are absent in nitrogen. |
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| 1915. |
Which of the following is oxidised by `O_(3)?`A. `K_(2)MnO_(4)`B. `Fe_(2)(SO_(4))3)`C. `KMnO_(4)`D. `K_(2)Cr_(2)O_(7)` |
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Answer» Correct Answer - A Mn is in `+6` oxidation state and can be oxidised to `+7`, remaining salts cannot be oxidised as central atoms are in their highest oxidation states. |
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| 1916. |
How is ozone prepared from oxygen ? Explain its reaction with PbS. |
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Answer» Preparation of Ozone : A slow dry stream of oxygen under silent electric discharge to form ozone (about `10%`) The product obtained is known as ozonised oxygen. `3O_(2)to2O_(3) DeltaH^(@)=142"kJ"//"mole"` `to` The formation of ozone is an endothermic reaction. `to` It is necessary to use silent electric discharge in the preparation of `O_(3)` to prevent its de composition Reaction with PbS : Black lead sulphide oxidised to white lead sulphate in presence of ozone. `PbS+4O_(3)toPbSO_(4)+4O_(2)`. |
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| 1917. |
Which of the following oxides of nitrogen is the anhydride of nitrous acid?A. NOB. `N_(2)O_(3)`C. `N_(2)O_(4)`D. `N_(2)O_(5)` |
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Answer» Correct Answer - B Nitrous acids gives dinitrogen trioxide on dehydration . `2HNO_2 to H_2O +N_2O_3 ` |
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| 1918. |
Which of the following oxides of nitrogen is the anhydride of nitrous acid?A. `NO`B. `N_(2)O_(3)`C. `N_(2)O_(4)`D. `N_(2)O_(4)` has two resonance structure |
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Answer» Correct Answer - B `2HNO_(2)rarrH_(2)O+N_(2)O_(3)` |
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| 1919. |
Oxygen is not evolved on reaction of ozone withA. `H_(2)O_(2)`B. `SO_(2)`C. `Hg`D. `KI` |
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Answer» Correct Answer - B Ozone on treatment with `SO_(2)` produce `SO_(3)` `3SO_(2)+O_(3)rarr3SO_(3)` |
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| 1920. |
Which of the following oxides of nitrogen is the anhydride of nitrous acid?A. `NO`B. `N_(2)O_(3)`C. `N_(2)O_(4)`D. `N_(2)O_(5)` |
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Answer» Correct Answer - B `2HNO_(2)rarrH_(2)O+N_(2)O_(3)` |
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| 1921. |
Nitric oxide is prepared by the action of `HNO_(3)` onA. `Fe`B. `Cu`C. `Zn`D. `Sn` |
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Answer» Correct Answer - B `3Cu+8HNO_(3)rarr3C(NO_(3))_(2)+4H_(2)O+2NO` |
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| 1922. |
What happens when: (a)`NH_(4)Cl` & `NaNO_(3)` is heated strongly. , (b)`(NH_(4))_(2)CO_(3)` is heated. , ( c)`NH_(4)NO_(2)` is heated. (d)`Mg_(3)N_(2)` reacts with water. , (e)`Mg` is burnt in air and the product is treated with water. |
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Answer» Correct Answer - (a)`NH_(4)Cl+NaNO_(3)toNH_(4)NO_(3)+NaCl ; NH_(4)NO_(3) overset(Delta)to N_(2)O+2H_(2)O` (b)`(NH_(4))_(2)CO_(3) overset(Delta)to 2NH_(3)+CO_(2)H_(2)O`, (c )`NH_(4)NO_(2) overset(Delta)to N_(2)+2H_(2)O (d)`Mg_(3)N_(2) + 6H_(2)O overset(Delta) to 3 Mg(OH)_(2)+2NH_(3)` (e)`2Mg+O_(2)overset(Delta)to 2MgO ; 3Mg+N_(2) overset(Delta) Mg_(3)N_(2) ; Mg_(3)N_(2) +6H_(2)O overset(Delta) to 3 Mg(OH)_(2)+2NH_(3)` |
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| 1923. |
Which ion cannot be oxidizes by ozone?A. `I^(-)`B. `AsO^(3-)`C. `[Fe(CN)_(6)]^(3-)`D. `MnO_(4)^(2-)` |
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Answer» Correct Answer - C In `[Fe(CN)_(6)]^(3-)`, iron is in highest oxidation state `+3`. |
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| 1924. |
Which of the following oxidizes `H_(2)O` to oxygen?A. ChlorineB. FluorineC. BromineD. Iodine |
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Answer» Correct Answer - B `2F_(2)+2H_(2)Orarr4HF+O_(2)` |
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| 1925. |
On strongly heating `Pb(NO_(3))_(2)` crystals, the gas formed isA. `NO_(2)`B. `O_(2)`C. `NO_(2)+O_(2)`D. `NO` |
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Answer» Correct Answer - c `NH_(2)OH+HNO_(2)rarrH_(2)overset(+1)(N_(2))O_(2)+H_(2)O` |
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| 1926. |
Which ion cannot be oxidizes by ozone?A. `l^(-)`B. `AsO_(3)^(3-)`C. `[Fe(CN)_(6)]^(3-)`D. `MnO_(4)^(2-)` |
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Answer» Correct Answer - C In `[Fe(CN)_(6)]^(3-)` , iron is in hightest oxidation state `+3`. |
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| 1927. |
Which of the following combines with `Fe^(2+)` ions to form brown complex ?A. `N_(2)O`B. `NO`C. `N_(2)O`D. `N_(2)O_(5)` |
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Answer» Correct Answer - B `FeSO_(4)+NOrarrFeunderset("Brown")(SO_(4)xx)NO` |
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| 1928. |
Which of the following is least reactive?A. White phosphorusB. Yellow phosphorusC. Red phosphorusD. Black phosphorus |
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Answer» Correct Answer - D Black phosphorus is the thermodynamically most stable form of phosphorus as it is a highly polymerised form of phosphorus.Hence it is least reactive. |
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| 1929. |
Moist iodine reacts with ozone to form.A. `Hl`B. `Hlo_(3)`C. `l_(2)O_(4)`D. `l_(2)O_(5)` |
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Answer» Correct Answer - B `O_(3)toO_(2)+[O] xx 5` `l_(2)+5[O]to l_(2)O_(5)` `(I_(2)O_(5)+H_(2)Oto 2HIO_(3))/(5O_(3)+I_(2)+H_(2)Oto5O_(2)+2HIO_(3))` |
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| 1930. |
….is obtained when ammonium dichromate is heated.A. nitrogenB. oxygenC. ammoniaD. none |
| Answer» Correct Answer - A | |
| 1931. |
Which of the following combines with `Fe^(2+)` ions to form brown complex ?A. `N_(2)O`B. `NO`C. `N_(2)O_(3)`D. `NO_(2)` |
| Answer» Correct Answer - B | |
| 1932. |
From the reactions given below. Identify `(A),(B),( C)` and `(D)` and write their formulae. (i)`(A)+"dil." H_(2)SO_(4)+K_(2)Cr_(2)O_(7) to(B)` Green solution `(A)+"dil." H_(2)SO_(4)+( C) to MnSO_(4)` `(A)+O_(2) H_(2)O to (D)` `(D)+BaCl_(2) to` White ppt. |
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Answer» Correct Answer - (A)`Na_(2)SO_(3)` (B)`Cr_(2)(SO_(4))_(3)` ( C )`KMnO_(4)` (D)`Na_(2)SO_(4)` |
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| 1933. |
Which one of the following property is not correct for ozone?A. It oxidises lead sulphideB. It oxidises potassium iodideC. It oxidises mercuryD. It cannot act as bleaching agent in dry state. |
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Answer» Correct Answer - D `O_(3)` can act as a bleaching agent even in the absence of water. |
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| 1934. |
`NH_(4)Cl(s)` is heated in test tube.Vapours are brought in contract with red litmus paper, which changes to blue and then to red.It is because of :A. formation of `NH_(4)OH` and `HCl`B. formation of `NH_(3)` and `HCl`C. greater diffusion of `NH_(3)` than `HCl`D. greater diffusion of `HCl` than `NH_(3)` |
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Answer» Correct Answer - C Order of the rate of diffusion `NH_(3) gt HCl`. `r prop 1/sqrtM` , where `r`=rate of diffusion and `M`=molecular weight |
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| 1935. |
Which of the following statements is not true about ozone ? |
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Answer» Correct Answer - C `O_(3)` oxidises `SnCl_(2)` and `SO_(2)` and `Sn O_(2)` and `SO_(3)` respectively without forming `O_(2)`. `3SO_(2)+O_(3)to3SO_(3)` `3SnCI_(2)+2O_(3)to 3SnO_(2)+3CI` |
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| 1936. |
Which of the following is responsible strach-iodide paper blue when it is brought in contact with `O_(3)`?A. Liberation of iodineB. Liberation of oxygenC. Formation of alkaliD. Reaction of ozone with litmus paper. |
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Answer» Correct Answer - A `O_(3)toO_(2)+O` `(2Kl+H_(2)O+Oto2KOH+I_(2))/(2KI+H_(2)O+O_(3)toO_(2)+2KOH+I_(2))` |
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| 1937. |
What do you understand by talling of mercury ? |
| Answer» Correct Answer - Mercury is a mobile liquid but in presence of ozone it loses its mobility due to the formation of mercury suboxide and starts sticking to the glass. This is called as tailing of mercury. `2Hg + O_(3) to Hg_(2)O + O_(2)` | |
| 1938. |
Ozone is prepared by passing silent electric discharge through oxygen. In this reactionA. energy is given outB. energy is absorbedC. oxygen is dissociated into atomD. oxygen is loaded with energy. |
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Answer» Correct Answer - B Energy is absorbed during the conversation of `O_(2)` into `O_(3)` |
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| 1939. |
What happens when : (a)`K_(2)Cr_(2)O_(7)` (b)Silent electric discharge is passed through pure and dry `O_(2)` (c )Ozone reacts with dry iodine (d)`2`-Ethyl anthraquinol undergoes air oxidation (e)`H_(2)S` and `SO_(2)` react in presence of moisture (f)Burning magnesium is kept in the atmosphere of `SO_(2)` (g)Acidified iodates react with `SO_(2)` (h)Conc. `H_(2)SO_(4)` is made to react with phosphorus pentaoxide |
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Answer» Correct Answer - (a)`4K_(2)Cr_(2)O_(7)overset(Delta)to4K_(2)CrO_(4)+2Cr_(2)O_(3)+3O_(2)` , (b)`3O_(2) underset("electric discharge")overset("silent")2O_(3)` , (e)`2H_(2)S+SO_(2)overset("moisture")to 2H_(2)O + 3S` , (f)`3Mg+SO_(2)to 2MgO+ MgS` (g)`2KIO_(3)+5SO_(2) + 4H_(2)O to K_(2)SO_(4) + 4H_(2)SO_(4) +I_(2)` , (h)`H_(2)SO_(4)+P_(2)O_(5) to 2HPO_(3)+SO_(3)` |
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| 1940. |
Why is white phosphorus kept under water ? |
| Answer» Due to angle strain and weaker forces of attraction, ignition temperature of white P is very low (303 K). Therefore, on exposure to air, it spontaneously catches fire forming `P_(4)O_(10)`. Therefore, to protect it from air, it is kept under water. | |
| 1941. |
Complete the chemical equatio : `Ca_(3)(PO_(4))_(2)+SiO_(2)+Coverset("Heat")to` |
| Answer» `Ca_(3)(PO_(4))_(2)+6SiO_(2)+10Coverset(1773K)to6CaSiO_(3)+P_(4)+10CO` | |
| 1942. |
Write any two uses of Helium. |
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Answer» Uses of Helium : i) It is non inflammable and very light gas. Hence it is used in the balloons of Meteorological observations. ii) It is used in gas cooled nuclear reactors and used as cryogenic agent. iii) It is used as diluent for oxygen in modern diving apparatus. |
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| 1943. |
Complete the following reactions : (i)`XeF_(2)+H_(2)to , (ii)XeF_(6)+SiO_(2) to` (iii) `XeF_(6) + NH_(3) to` , (iv)`XeF_(6)+H_(2)O to` (v)`XeF_(6) + SbF_(5) to` (vi)`XeF_(4)+4KI to Xe + 4 KF +2I_(2)` (vii)`XeF_(4) + BCl_(3) overset(-78^(@)C)to` |
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Answer» Correct Answer - (i)`XeF_(2)+H_(2)toXe+2HF` (ii)`2XeF_(6)+SiO_(2)to2XeOF_(4)+SiF_(4)`; `2XeOF_(4) + SiO_(2)to2XeO_(2)F_(2) + SiF_(4)` `2XeO_(2)F_(2) + SiO_(2)to2XeO_(3) ("Explosive")+SiF_(4)` (iii)`XeF_(6)+8NH_(3)toXe + 6NH_(4)F + N_(2)` (iv)`XeF_(6)+3H_(2)OtoXeO_(3) + 6HF` (v)`XeF_(6) + SbF_(5)to[XeF_(5)]^(+) [SbF_(6)]^(-)` [Addition ionic product is formed] (vi)`XeF_(4)+4KItoXe + 4 KF +2I_(2)` (vii)`3XeF_(4) + 4BCl_(3) overset(-78^(@)C)to4BF_(3) + 3Xe + 6Cl_(2)` |
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| 1944. |
Write the preparations of Xenon Oxides. |
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Answer» Xenon Oxides : Xenon forms two oxides` XeO_(3)` and `XeO_(4)` with oxygen. These oxides are formed by the hydrolysis of xenon fluorides. `6XeF_(4)+12" H"_(2)O to4" Xe"+2" XeO"_(3)+24" HF"+3O_(2)` `XeF_(6)+3H_(2)O to XeO_(3)+6 HF` |
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| 1945. |
Explain the reaction of the following with water. `XeF_(4)` |
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Answer» `XeF_(4)` is hydrolysed to give `XeO_(3)` `6XeF_(4)+12H_(2)O to4Xe+2XeO_(3)+24" HF"+3O_(2)` |
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| 1946. |
How does `XeO_(3)` reacts with aqueous alkali ? |
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Answer» Correct Answer - `XeO_(3)+NaOHtoNa^(+) [HXeO_(4)]^(-)` (sodium xenate) |
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| 1947. |
Explain the reaction of the following with water. `XeF_(6)` |
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Answer» `XeF_(6)` undergo hydrolysis to form `XeO_(3)` `XeF_(6)+3H_(2)O to XeO_(3)+6HF` `XeF_(6)` undergo partial hydrolysis to form `XeOF_(4)+XeO_(2)F_(2)` `XeF_(6)+H_(2)O toXeOF_(4)+2HF` `XeF_(6)+2H_(2)O to XeO_(2)F_(2)+4HF` |
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| 1948. |
Write the preparations of Xenon flourides. |
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Answer» Xenon flourides : Xenon forms three binary fluorides, Xe `F_(2),XeF_(4)`, and `XeF_(6)` by the direct reaction of Xenon with fluorine under suitable conditions. `underset(("xenon in excess"))(Xe(g)+F_(2)(g))overset("673K, 1 bar")toXeF_(2)(S)` `underset((1:5" ratio"))(Xe(g)+2F_(2)(g))overset("873, 7 bar")toXeF_(4)(S)` `underset((1:20" ratio"))(Xe(g)+3F_(2)(g))overset("573K, 60-70 bar")toXeF_(4)(S)` `XeF_(6)` can also be prepared by the interaction of `XeF_(4)` and `O_(2)F_(2)` at 143 K. `XeF_(4)+O_(2)F_(2)toXeF_(6)+O_(2)` |
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| 1949. |
Write the oxidation product when `XeO_(3)` oxidises `I^(-)` in acidic medium. |
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Answer» Correct Answer - `XeO_(3)+6H^(+) + 9I^(-)toXe + 3H_(2)O +3I_(3)^(-)` `XeO_(3)+6H^(+) + 6I^(-)toXe + 3H_(2)O +3I_(2)` |
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| 1950. |
The geometry of `I_(3)^(-)` isA. triangularB. linearC. tetrahderalD. T-Shape |
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Answer» Correct Answer - B `I_(3)^(-)` ion is ` sp^(3)`d-hybridised. Due to the presence of three lone pair of electrons its geometry becomes linear instead of trigonal bipyramidal. |
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