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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.
| 1451. |
In Greek the word halo meansA. SaltB. SugarC. SolubleD. Sublime |
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Answer» Correct Answer - A Halogens in Greek means sea salt |
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| 1452. |
The general electronic configuration of halogen family isA. `ns^2 np^5`B. `ns^2 np^6`C. `ns^2 np^4`D. `ns^2 np^3` |
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Answer» Correct Answer - A Outer electronic configuration of halogen is `ns^2 np^5` |
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| 1453. |
Among the following halogens the radioactive halogen isA. FB. ClC. BrD. At |
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Answer» Correct Answer - D At (at. No. 85) is radioactive. |
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| 1454. |
Write the balanced equation for the following ractions. (i) SnO is treated with dilute `HNO_(3)` (ii) Tin is heated with excessof chlorine gas (iii) Lead sulphide is heated in air. |
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Answer» (i) Stannous nitrate is formed `SnO+2HNO_(3)(dil)rarrSn(NO_(3))_(2)+H_(2)O` (ii) Stannic chloride is formed `Sn+2Cl_(2)overset("Heat")rarrSnCl_(4)` (iii) A mixture of PbO and `SO_(2)` is formed. `2PbS+3O_(2)overset("Heat")rarr2PbO+2SO_(2)` |
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| 1455. |
Tin dissolve in dilute `HNO_(3)` formingA. Mtastannic acidB. Nitrous oxideC. Ammounium nitrateD. Stannic nitrate |
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Answer» Correct Answer - C `4Sn+10 "dil" HNO_(3)to4Sn(NO_(3))_(2)+NH_(4)NO_(3)+3H_(2)O` Fe also reats in the same manner. |
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| 1456. |
Calcium carbied react with water to produceA. Methylene gasB. Accetylene gasC. Oxy-acetylene gasD. oxy-methylene gas |
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Answer» Correct Answer - B `CaC_(2)+2H_(2)Otounderset("Acetylene gas")(Ca(OH)_(2))+C_(2)H_(2)` |
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| 1457. |
When `CO` is heated with `NaOH` under pressure, we getA. Sodium benzeneB. Sodium acetateC. Sodium formateD. Sodium oxalate |
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Answer» Correct Answer - C `CO+NaOHoverset("Under pressure")tounderset("Sodium formate")(H-COO-Na)` |
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| 1458. |
When CO is heated with NaOH under pressure, we get :A. Sodium benzoateB. Sodium acetateC. Sodium formateD. Sodim oxalate |
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Answer» Correct Answer - C `CO+NaOHtoHCOONa` |
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| 1459. |
Which compound reacted with `CO_2` gives an organic compound?A. `H_2O`B. `NH_3`C. `Cl_2`D. `PCl_5` |
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Answer» Correct Answer - B `2NH_3 + CO_2 to NH_2COONH_4 oversetDeltato underset"(Urea)"(NH_2CONH_2) + H_2O` |
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| 1460. |
Phosphine on reaction with hydrobromic acid givesA. `PBr_3`B. `PH_4Br`C. `PBr_5`D. `P_2H_4` |
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Answer» Correct Answer - B `PH_3 + HBr to PH_4Br` |
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| 1461. |
Supercritical `CO_(2)` is used asA. dry iceB. fire fightingC. a solvent for extraction of organic compounds from natural sourcesD. a highy inert medium for carrying out various reations |
| Answer» Correct Answer - C | |
| 1462. |
All the following decompes easily on heating to give oxygen except :A. barium peroxideB. potassium dichromateC. sodium nitrateD. None of these |
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Answer» Correct Answer - D `2BaO_(2)overset(800^circC)to 2BaO+O_(2)` `4K_(2)Cr_(2)O_(7) overset(Delta)to4K_(2)CrO_(4)+2Cr_(2)O_(3)+3O_(2)` `2NaNO_(3)overset(Delta)to 2NaNO_(2)+O_(2)` |
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| 1463. |
By which of the following `SO_(2)` is formed ?A. Reaction of dilute `H_(2)SO_(4)` with `O_(2)`B. Heating `Fe _(2)(SO_(4))_(3)`C. Reaction of concentrated `H_(2)SO_(4)` with `Cu`.D. None |
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Answer» Correct Answer - C (A) No reaction takes place between `H_(2)SO_(4)` and `O_(2)`. (B) `Fe_(2)(SO_(4))_(3)overset(Delta)toFe_(2)O_(3)+3SO_(3)` (C ) `Cu+2H_(2)SO_(4)(conc) to CuSO_(4)+2H_(2)O+SO_(2)` |
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| 1464. |
What is the product formed when ozone reacts with mercury?A. `HgO`B. `Hg_(2)O_(2)`C. `Hg_(2)O`D. `HgO_(2)` |
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Answer» Correct Answer - C `2Hg+O_(3)toHg_(2)O+O_(2)` |
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| 1465. |
Which one of the following properities is correct for ozone ?A. It is used for killing water -born germsB. It reacts with dry iodine to form `l_(4)O_(9)`C. It oxidises mercury to mercury suboxideD. All of these |
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Answer» Correct Answer - D (A) It is correct statement (B) `2l_(2)+9[O_(3)] to l_(4)O_(9)+9O_(2)` (C ) `2Hg+O_(3)` (to) `Hg_(2)O+O_(2)` |
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| 1466. |
In laboratory silicon can be prepared by the reactionA. silica with magnesiumB. by heating carbon in electric furnaceC. by heating potassium fluosilicate with potassium.D. none of these |
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Answer» Correct Answer - A `SiO_(2)+2Mg to Si+2MgO` |
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| 1467. |
The correct order of acidic strength isA. `Cl_(2)O_(7) gt SO _(2) gt P_(4)O_(10)`B. `CO_(2) gt N_(2)O_(5) gt SO_(3)`C. `Na_(2)O gt MgO gt Al_(2)O_(3)`D. `K_(2)O gt CaO gt MgO` |
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Answer» Correct Answer - A As non-metallic character of element attched to oxygen atom increases, the difference between the electronegativity values of element and oxygen decreases and the acid character of oxides increases and vice-versa. |
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| 1468. |
Ammonia can be dried by :A. `conc. H_(2)SO_(4)`B. `P_(4)O_(10)`C. `CaCO`D. `anhydrous CaCl_(2)` |
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Answer» Correct Answer - C It reacts with conc. `H_(2)SO_(4),P_(4)O_(10)` and anhydrous `CaCl_(2)` but not with `CaO`. `2NH_(3)+H_(2)SO_(4) to (NH_(4))_(2)SO_(4)" , "P_(4)O_(10)+ 12NH_(3) to 4(NH_(4))_(3)PO_(4)+6H_(2)O`. `CaCl+8NH_(3) to CaCl_(2).8NH_(3)." , "CaO+H_(2)O to Ca(OH)_(2)`. |
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| 1469. |
What are the inter halogen compounds ? Give two examples. |
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Answer» The compounds formed between different halogens are called inter halogen compounds. Ex : `"ClF"_(3),"BrF"_(3),"IF"_(7),"ICl"_(3)` |
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| 1470. |
`"I"_(2)` is more soluble in KI give reason. |
| Answer» `"I"_(2)` forms soluble `KI_(3)` with KI solution. `I_(2)+KI to KI_(3)`. | |
| 1471. |
Why is dry chlorine cannot act as a bleaching agent. |
| Answer» Dry chlorine cannot produce nascent oxygen. Hence it cannot act as a bleaching agent. | |
| 1472. |
Hypo is used in photography toA. Reduce `AgBr` grains to metallic silverB. Convert the metallic silver to silver saltC. Remove undecomposed silver bromide as a soluble complexD. Remove reduced silver |
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Answer» Correct Answer - C `AgBr+2Na_(2)S_(2)O_(3)rarrNa_(3)[Ag(S_(2)O_(3))_(2)]+NaBr` |
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| 1473. |
`SO_(2)` reacts with chlorine in sunlight to form :A. sulphuryl chlorideB. sulphonyl chlorideC. sulphur acidD. sulphuric acid. |
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Answer» Correct Answer - A `SO_(2)+Cl to SO_(2)Cl_(2)` |
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| 1474. |
The product of the chemical reaction between `Na_(2)S_(2)O_(3)`, `Cl_(2)` and `H_(2)O` areA. `S+HCl+Na_(2)S`B. `S+HCl+Na_(2)SO_(4)`C. `S+HCl+NaSO_(3)`D. `S+NaClO_(3)+H_(2)O` |
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Answer» Correct Answer - B `Na_(2)S_(2)O_(3)+Cl_(2)+H_(2)OrarrNa_(2)SO_(4)+2HCI+S` |
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| 1475. |
Write the reaction of chlorine with hypo `(Na_(2)S_(2)O_(3))`. |
| Answer» Reaction of chlorine with hypo `(Na_(2)S_(2)O_(3)).Na_(2)S_(2)O_(3)+Cl_(2)+H_(2)O toNa_(2)SO_(4)+2HCl+S`. In this reaction hypo acts an "antichlor". | |
| 1476. |
In `SiO_(4)^(4-)`, silicon is inA. `sp`-hybrid stateB. `sp^(2)`-hybrid stateC. `sp^(3)`-hybrid stateD. `dsp^(3)`-hybrid state |
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Answer» Correct Answer - C `sp^(3)`-hybrid state [giant molecule formation by tetrahedral `Si` atom] |
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| 1477. |
Which of the following oxides is the most acidic?A. `N_(2)O_(5)`B. `P_(2)O_(5)`C. `As_(2)O_(5)`D. `Sb_(2)O_(5)` |
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Answer» Correct Answer - A The difference of electronegativities between nitrogen `(V)` and oxygen is least as compared of that of in the other oxides. On moving down the group acidic strength decreses. |
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| 1478. |
which one of the following is not correct for the allotropic forms of carbon?A. `C_(60)` molecule has a shape like soccer ball and called Buckministerfullerene.B. Graphite is thermodynamically most stable allotrope of carbon,C. Graphite fiberes embedded in plastic meterial form high strength. Lightweight composites.D. In diamond each carbon atom undergoes `sp^(3)` hybridisation and is paramangetic. |
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Answer» Correct Answer - D Diamonds is diamangnetic as there is no unpaired electron. |
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| 1479. |
Which form of carbon is used to decolorise sugar? |
| Answer» Correct Answer - Bone chrocoal | |
| 1480. |
Dinitrogen gas is evolved when sodium nitrite is heated :A. aloneB. with ammonium chlorideC. with ammonium hydroxideD. with potassium nitrate |
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Answer» Correct Answer - B `NaNO+NH_(4)Cl to NaCl+N_(2)+2H_(2)O` |
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| 1481. |
Which of the following compounds does give `N_(2)` on heating ?A. `NH_(4)NO_(2)`B. `NH_(4)NO_(3)`C. `NaN_(3)`D. Both (A) and ( C) |
| Answer» Correct Answer - D | |
| 1482. |
The mixed anhydride of nitrous and nitric acid is.A. `NO`B. `NO_(2)`C. `N_(2)O_(5)`D. `N_(2)O` |
| Answer» Correct Answer - B | |
| 1483. |
Write down a reaction showing action of `N_(2)O_(4)(l)` as non-aqueous solvent. |
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Answer» Correct Answer - `N_(2)O_(4)(l)hArrNO^(+)` (acid)+ `NO_(3)^(-)` (base) `ZnCl_(2)+2N_(2)O_(4)(l) to Zn(NO_(3))_(2)+2NOCl` |
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| 1484. |
How many silicon atoms are present in the atom are present in the anion of a pyrosilicates ? |
| Answer» Correct Answer - 2 | |
| 1485. |
Which of the following statement is `//`are correct regarding `F^(-)` and `CI^(-)` (i) `Cl^(-)` can give up an electron more easily than `F^(-)` (ii) `Cl^(-)` is smaller in size than `F^(-)` (iii) `Cl^(-)` is a better reducing agent then `F^(-)` (iv) `F^(-)` can be oxidized more readily than `Cl^(-)`A. I and IIB. I. II and IVC. III and IVD. Only I |
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Answer» Correct Answer - D The electronegativity of `F^(-)` ion is high, so it accept an electron and `Cl^(-)` ion give an electron more easily. Also the size of `F^(-)` is smaller then chloride ion `(Cl^(-))`. |
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| 1486. |
Carborundum is obtained when silica is heated at high temperature withA. CarbonB. carbon monoxideC. carbon dioxideD. calcium carbonate |
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Answer» Correct Answer - D `SiO_(2) + 3Cunderset(2300 K)overset(" High temp")tounderset(" Carborundum ")(SiC) +2CO` |
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| 1487. |
Aluminium metal is corroded in coastel places near toA. is removed by sea waterB. reacts with sea waterC. is attacked by salt present in sea waterD. reacts with sand particles |
| Answer» (c ) It is a reson for given fact. | |
| 1488. |
Supercritical `CO_(2)` is used asA. dry iceB. fire fightingC. a solvent for extraction of organic compounds from natural sourcesD. a highy inert medium for carrying out various reations |
| Answer» Correct Answer - C | |
| 1489. |
Ammonal used in boms is a mixture of:A. `Al+Al(NO_(3))_(3)`B. `Al+Al_(2)O_(3)+B_(2)O_(3)`C. `Al+KNO_(3)`D. `Al_(2)O_(3)+C`. |
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Answer» Correct Answer - A A mixture of Al and `Al(NO_(3))_(3)` is used as an explosive in bombs. |
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| 1490. |
Which is correct statement in the following?A. `BCl_(3)` and `AlCl_(3)` are both Lewis acids and `BCl_(3)` is a stronger than `AlCl_(3)`.B. `BCl_(3)` and `AlC l_(3)` are both Lewis acids and `AlCl_(3)` is stronger than `BCl_(3)`.C. `BCl_(3)` and `AlC_(3)` are equally strong Lewis acidsD. Both `BCl_(3)` and `A lCl_(3)` are not Lewis acids. |
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Answer» Correct Answer - A in `BCl_(3) p pi- p pi` back bonding is less effective than in `AlCl_(3)` because difference in energy levels of p-orbitals or boron (2p) an d of chlorine (3p) |
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| 1491. |
Maximum `p pi-p pi` back bonding exists inA. `BCl_(3)`B. `BI_(3)`C. `BBr_(3)`D. `BF_(3)` |
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Answer» Correct Answer - D In `BF_(3)`, boron atom has vacant `2p_(z)A.O.` and flurine atom has electron pair in `2 p A.O.` So maximum overlapping is possible between vacant `2p_(z) A.O.` of boron and fully filled `2p A.O.` of fluorine due to similar size of `A.O.`s. |
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| 1492. |
The compound(s) which generate(s) `N_(2)` gas upon thermal decomposition below `300^(@)C` is (are)A. `NH_(4)NO_(3)`B. `(NH_(4))_(2)Cr_(2)O_(7)`C. `Ba(N_(3))_(2)`D. `Mg_(3)N_(2)` |
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Answer» Correct Answer - B::C `NH_(4)NO_(3)` on heating gives `N_(2)O` while `Mg_(3)N_(2)` does not decompose below `300^(@)C`. Thus, `(NH_(4))_(2)Cr_(2)O_(7)andBa[N_(3)]_(2)` on thermal decomposition give `N_(2)` i.e., options (b,c) are correct. |
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| 1493. |
The straight chain polymer is formed byA. hydrolysis of `(CH_(3))_(4)SiCl_(3)` by addition condensation polymerisationB. hydrolysis of `(CH_(3))_(4)Si` by addition polymerisationC. hydrolysis of `(CH_(3))_(2)SiCl_(2)` followed by condensation polymerisationD. hydrolysis of `(CH_(3))_(3)SiCl` followed by condensation polymerisation |
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Answer» Correct Answer - C Hydrolysis of `(CH_(3))_(2)SiCl_(2)` followed by condensation gives straight chain polymers. |
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| 1494. |
Which of the following does not exist?A. `Si(OH)_(4)`B. `B(OH)_(4)^(-)`C. `SiCl_(6)^(2-)`D. `AlF_(6)^(3-)` |
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Answer» Correct Answer - C Because of steric crowding. |
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| 1495. |
The ammonium salt which produces ammonia gas on heating is :A. `NH_(4)NO_(2)`B. `(NH_(4))_(2)SO_(4)`C. `NH_(4)NO_(3)`D. `(NH_(4))_(2)Cr_(2)O_(7)` |
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Answer» Correct Answer - B `(NH_(4))_(2)SO_(4) overset(Delta) rarr NH_(3)+H_(2)SO_(4)` |
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| 1496. |
Which of the following representation is correct?A. `_(6)C^(12)"("_(1)H^(1),_(0)n^(1))_(7)N^(13)`B. `_(25)Mn^(55)(n,p)_(25)Mn^(56)`C. `_(20)Ca^(40)(p,n)_(21)Sc^(40)`D. `_(4)Be_(5)(p,n)_(3)Li^(6)` |
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Answer» Correct Answer - C `""_(20)Ca^(40)+_(1)^(1)Hto_(21)Sc^(40)+_(0)^(1)n` |
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| 1497. |
Which of the following specieds gives diatomic gas with diamagnetic behaviour with conc. `H_(2)SO_(4)`A. NaClB. NaBrC. NaID. all of them |
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Answer» Correct Answer - D `HCl,Br_(2),I_(2)` |
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| 1498. |
Which of the following reactions does not produces `H_(2)O_(2)`?A. `BaO_(2)+H_(2)SO_(4) rarr`B. `Na_(2)O_(2)+H_(2)O`(ice cold)`rarr`C. `PbO_(2)+H_(2)SO_(4) rarr`D. None of the above |
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Answer» Correct Answer - C `PbO_(2)+H_(2)SO_(4) rarr PbSO_(4)+H_(2)O+(1)/(2)O_(2)` |
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| 1499. |
Anhydrous `MgCl_(2)` can be prepared by :A. heating `MgCl_(2).6H_(2)O(s)`B. heating `MgCl_(2).6H_(2)O(s)` in dry HCl atmosphere at `175^(@)`C. heating KCl.`MgCl_(2).6H_(2)O`D. all of the above |
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Answer» Correct Answer - B Hydrated chloride on heating gets hydrolysed. `{:(MgCl_(2).6H_(2)O overset(Delta)rarr Mg (OH) Cl overset(Delta)rarr MgO+HCl),(" "darrHCl),(" " MgCl_(2)+H_(2)O):}` |
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| 1500. |
Silica gel is used as a/anA. dehydrating agent (drying agent)B. dehydrogenating agentC. reducing agentD. oxidising agent |
| Answer» (a) Silica gel is used as dehydrating agent ass it removes moistur from atmosphere. | |