InterviewSolution
Saved Bookmarks
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.
| 901. |
The reaction of `P_4` with aqueous NaOH givesA. `P(OH)_(3)`B. `P_(2)O_(5)`C. `P(OH)_(5)`D. `PH_(3)` |
|
Answer» Correct Answer - D `P_4+3NaOH + 3H_2O to 3NaH_(2)PO_(2) +PH_(3)` |
|
| 902. |
The correct order of solubility of noble gases in water is :A. `Ne lt Kr lt Ar gt Xe`B. `Ne lt Xe lt Ar lt Kr`C. `Xe lt Kr lt Ar lt Ne`D. `Ne lt Ar lt Kr lt Xe` |
|
Answer» Correct Answer - D `overset(overset(Ne lt Ar lt Kr lt Xe)to)({:(rarr,"Diople-Induced dipole attraction increases"),(rarr,"Solubility increases"):})` =Solubility of noble gas. |
|
| 903. |
With respect to halogens, four statements are given below: (P) The bond dissociation energies for halogens are in the order: `I_(2) lt F_(2) lt Br_(2) lt Cl_(2)`. (Q) The only oxidation state is -1. ( R) The amount of energy rquired for the excitation of electrons to first excited state decrease progressively as we move from F to I. (S) They form `HX_(2)^(-)` species in their aqueous solutions (X=halogen ). The correct statement are:A. P,Q and SB. P, R and SC. Q,R and SD. P,R |
|
Answer» Correct Answer - D Statement-P and Q are correct. |
|
| 904. |
By heating ammonium dichromate, a colouless gas is evolved. Which of the following compounds would produce the same gas on heating ?A. `NH_(4)NO_(3)`B. `(NH_(4))_(2)SO_(4)`C. `NH_(4)NO_(2)`D. `(NH_(4))_(2)HPO_(4)` |
|
Answer» Correct Answer - C `(NH_(4))_(2)Cr_(2)O_(7) rarrN_(2)+Cr_(2)O_(3)+H_(2)O` `NH_(4)NO_(2) rarrN_(2)+H_(2)O` |
|
| 905. |
In Brikeland-Eyde process, the raw material used isA. AirB. `NH_(3)`C. `NO_(2)`D. `HNO_(3)` |
|
Answer» Correct Answer - A Birkeland-Eyde process Dinitrigen is prepared commercially from air by liquefaction and fraction disillation. When liquid air is allowed to distil, dinitrogen having lower `b.pt(77K)` disrils over first leaving behind liquide oxygen `(bpt.90k)`. Worldwide production of dinitrogen from liquid air is more than `50` million tone s per year. |
|
| 906. |
Nitrogen forms how many oxidesA. `3`B. `4`C. `5`D. `6` |
|
Answer» Correct Answer - C (i)`underset("Colourless gas")underset("Nitric oxide")(NO)`,(ii)`underset("Colourless gas")underset("Nitrous oxide")(NO_(2))`,(iii)`underset("trioxideBlue liquid")underset("Dinitrogen")(N_(2)O_(3))` (iv)`underset("Tetraoxide Colourless liquid")underset("Dinitrogen")(N_(2)O_(4))`,(v)`underset("Pentaoxide Colourless gas")underset("Dinitrogen")(N_(2)O_(5))` |
|
| 907. |
When concentracted nitric acid is heated, it decomposes to giveA. `O_(2)` and `N_(2)`B. `NO`C. `N_(2)O_(5)`D. `NO_(2)` and `O_(2)` |
|
Answer» Correct Answer - D `4HNO_(3)rarr4NO_(2)+O_(2)+2H_(2)O` |
|
| 908. |
Correct order of bond angles are inA. `H_(2)OgtOF_(2)gtCl_(2)OgtClO_(2)`B. `OF_(2)gtH_(2)OgtCl_(2)OgtClO_(2)`C. `ClO_(2)gtCl_(2)OgtH_(2)OgtOF_(2)`D. `OF_(2)gtOCl_(2)gtH_(2)OgtClO_(2)` |
|
Answer» Correct Answer - C In `ClO_(2)`, due to larger size of chlorine atom, repulsion between non-bonding electrons on the chlorine atoms overcome the lone pair-lone pair repulsion.Hence, the order of bond angle `ClO_(2)gtCl_(2)OgtH_(2)OgtOF_(2)`. |
|
| 909. |
Consider a compound `CsXY_2` where X and Y are halogens. Which of the following statements is /are correct ? (i)X and Y have different oxidation states. (ii)For Y with lower atomic number than X, X can assume oxidation states higher then normal. (iii)Such compounds exist because `Cs^+` has a high charge to size ratioA. Only (i)B. (i) and (ii)C. Only (ii)D. (i) and (iii) |
| Answer» Correct Answer - B | |
| 910. |
Among the following substituted silanes, the one which will give rise to cross-liked silicone polymer on hydrolysis isA. `R_(3)SiCl`B. `R_(4)Si`C. `RSiCl_(3)`D. `R_(2)SiCl_(2)` |
|
Answer» Correct Answer - C `RSiCl_(3)` gives cross-linked polymer. |
|
| 911. |
Which of the following mixture is chromic acid?A. `K_2Cr_2O_7` and conc.`H_2SO_4`B. `K_2Cr_2O_7` and HClC. `K_2SO_3` and conc. `H_2SO_4`D. `H_2SO_4` and HCl |
|
Answer» Correct Answer - A `K_2Cr_2O_7 + H_2SO_4` |
|
| 912. |
Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that :A. (1) strong affinity of HCI gas for moisture In air results in forming of droplets of liquid solution which appears like a cloudy smoke.B. (2) strong affinity for water, conc. HCI pulls moisture of air towards self. The moisture forms droplets of water and hence the cloud.C. (3) conc. HCI emits strongly smelling HCI gas all the time.D. (4) oxygen in air reacts with emitted HCI gas to form a cloud of chlorine gas. |
| Answer» Correct Answer - D | |
| 913. |
Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that :A. concentrated hydrochloric acid emits strongly smelling HCl gas all the timeB. oxygen in air reacts with the emitted HCl gas to form a cloud of chlorine gasC. strong affinity of HCl gas for moisture in air result in forming droplets of liquid solution which appears like a cloudy smokeD. due to strong affinity for water , concentrated hydrochloric acid pulls moisture of air towards itself. This moisture forms droplets of water and hence the cloud. |
|
Answer» Correct Answer - B When `O_2` reacts with the emitted HCl a cloud of `Cl_2` gas produced . `2HCl +(1)/(2)O_(2) to H_2O+Cl_(2)` |
|
| 914. |
Which one of the following acids is the weakest?A. `HClO`B. `HBr`C. `HClO_(3)`D. `HCl` |
|
Answer» Correct Answer - A `underset("Weak acid")(HCIO) hArr H^(+) +underset("Strong conjgate base")(ClO^(-))` |
|
| 915. |
Which on is the anhydride of `HClO_(4)`?A. `Cl_(2)O`B. `ClO_(2)`C. `Cl_(2)O_(6)`D. `Cl_(2)O_(7)` |
|
Answer» Correct Answer - D `4HClO_(4)+P_(4)O_(10)rarr2Cl_(2)O_(7)+4HPO_(3)` |
|
| 916. |
Give the correct order of initials T or F for following statements. Use T if statements is true and F if if false. `(I)` Number of `S-S` bond in `H_(2)S_(n)O_(6)` are `(n+1)` `(II)` When `F_(2)` reacts with water gives `HF,O_(2)` and `O_(3)` `(III)` `LiNO_(3)` and `BaCl_(2)` compounds are used in the fire works `(IV)` Be and Mg hydrides are ionic and polymericA. `F T TF`B. `F T T T `C. `T F T T `D. `T T F F ` |
|
Answer» Correct Answer - 1 `rarr`Number of `S-S` bonds in `H_(2)O_(n)O_(6)` are `(n-1) H_(2)S_(n)O_(6)` `rarr F_(2)+H_(2)OrarrHF+O_(2)+O_(3)` `rarr LiNO_(3)` produces crimson red while `BaCl_(2)` produces green colour in fire works. `rarr`Hydrides of Be and Mg are covalent and polymeric. |
|
| 917. |
Water gas is used as an industerial fuel becauseA. on combution, it further produces `CO_(2)`B. on combustion, it looses heatC. on combustion, It produces `CO_(2)` and liberates heatD. None of the above |
| Answer» (c ) Water gas on combustion produces `CO_(2)` and liberate heat. | |
| 918. |
The order of catenation of C,Si,Ge,S isA. `CltSilt GeltSn`B. `CgtSigtGegtSn`C. `CgtgtSigtGeapproxSn`D. `CapproxSigtgtGeapproxSn` |
|
Answer» (c ) The order of catenation of C, Si, Ge, Sn is `CltltSigtGeapproxGn` |
|
| 919. |
When a mixture of air and steam is passed over red hot coke, the outgoing gas is:A. Producer gasB. Water gasC. Coal gasD. None of these gases. |
|
Answer» Correct Answer - D `H_(2)` and `CO_(2)` are the gases formed `2H_(2)O+O_(2)+2Crarr2H_(2)+2cO_(2)` (steam) (air) (coke) |
|
| 920. |
`{:("Column I","Column II"),((A)PbO_(2)+HNO_(3)to,(p)"One of the products has bond order of two." ),((B)Cr_(2)O_(7)^(2-)+H^(+)+H_(2)O_(2)to,(q)"One of the products has peroxide linkages(s)."),((C)H_(2)O_(2)+CIO_(2)+OH^(-)to,(r)"One of the products is a hydride and is liquid at room temperature."),((D)XeF_(2)+NaOH to,(s)"One of the products has bent shape with two lone pairs of electrons on central atom".):}` |
|
Answer» Correct Answer - `(A - p,r,s); (B - q,r,s); (C - p,r,s); (D - p,r,s)` (A)`PbO_(2)+2HNO_(3)toPb(NO_(3))_(2)+1/2O_(2)+H_(2)O` (B) `Cr_(2)O_(7)^(2-)+2H^(+)+4H_(2)O_(2)to2CrO_(5)+5H_(2)O` (C) `H_(2)O_(2)+2CIO_(2)+2OH^(-)to2CIO_(2)^(-)+2H_(2)O+O_(2)` (D) `XeF_(2)+2NaOHtoXe+1/2O_(2)2NaF+H_(2)O` |
|
| 921. |
`CIO_(3)` is the mixed anhydride of :A. `HCIO_(2)` and `HCIO_(3)`B. `HCIO_(3)` and `HCIO_(4)`C. `HCIO_(2)` and `HCIO_(4)`D. `HCIO_(2)` and `HCIO_(3)` |
|
Answer» Correct Answer - B |
|
| 922. |
`CIO_(2)` is the anhydride of :A. HOClB. `HCIO_(2)`C. `HCIO_(3)`D. `HCIO_(2)` and `HCIO_(3)` |
|
Answer» Correct Answer - D |
|
| 923. |
`{:("Column I","Column II"),((A)2NO_(2)overset("Cool")to,(p)"One of the products is a mixed anhydride ." ),((B)CIO_(2)+O_(3)overset(H^(+))to,(q)"One of the products is an acidic oxide."),((C)K_(4)[Fe(CN)_(6)]+H_(2)SO_(4)("conc".)+H_(2)Ooverset(Delta)to,(r)"The oxidation state of the central atom of one of the products is +6."),((D)KOH+O_(3)to,(s)"One of the products is a colourless paramagnetic gas".):}` |
|
Answer» Correct Answer - `(A - p,q) ; (B - p,q,r,s) ; (C - r; D - s)` (A) `2NO_(2)overset("Cool")toN_(2)O_(4)` colourless solid //liquid, acidic, mixed anhydride of `HNO_(2)and HNO_(3)`. `2CIO_(2)+2O_(3)overset(H^(+))toCI_(2)O_(6)`(yellow solid)`+2O_(2)`, acidic,mixed anhydride of `HCIO_(3) and HCIO_(4)` (C) `K_(4)[Fe(CN)_(6)]+6H_(2)O+6H_(2)SO_(4)overset(Delta)to2K_(2)SO_(4)+FeSO_(4)+3(NH_(4))_(2)SO_(4)+6COuarr` (D) `2KOH+5O_(3)to2KO_(3)("orange solid")+5O+H_(2)O` |
|
| 924. |
`P_(4)` reduces copper sulphate solution to metallic copper. |
|
Answer» Correct Answer - T `P_(4)+3CuSO_(4)+6H_(2)OtoCu_(3)P_(2)+2H_(3)PO_(3)+3H_(2)SO_(4)` `Cu_(3)P_(2)+5CuSO_(4)+8H_(2)Oto8Cu+5H_(2)SO_(4)+2H_(3)PO_(4)` |
|
| 925. |
Red phosphorus catches fire at room tempt. |
|
Answer» Correct Answer - F Does bot catch fire as its ignition tempeatrue is `260^(circ)C`. |
|
| 926. |
Which of the following staments are incorrect in context of borax?A. It is made up of two triangular `BO_(3)` units and two tetrahederal `BO_(4)` unitsB. One mole of bora can be used as a bufferC. It is a useful primary standerd for titrating against acidsD. Aqueous solution of borax can be used as a buffer |
|
Answer» (b) Borax is `Na_(2)B_(4)O_(7)cdot10H_(2)O` in which 2 molecules of water among 10 molecules form a part of structure and exists as `Na_(2)[B_(4)O_(5)(OH)_(4)]cdot8H_(2)O`. Methyl orange with pH value of 3.7 is used to detect end point. Aqueous solution of borax acts as buffer because borax is salt of strong base (NaOH) and weak acid `(H_(3)BO_(3))` |
|
| 927. |
Assertion: Silicones are hydrophobic in nature. Reason: `Si-O-Si` linkage are moisture sensitive.A. If both assertion and reason are true and the reason is the correct explanation of teh assertion.B. If both assertion and reason are true but reason in not the correct explation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true. |
|
Answer» Correct Answer - C If assertion is true but reason is false. |
|
| 928. |
`AlF_(3)` soluble in `HF` only in presence of KF. It is due to the formation ofA. `K_(3)[AlF_(3)H_(3)]`B. `K_(3)[AlF_(6)]`C. `AlH_(3)`D. `Kl[AlF_(3)H]` |
|
Answer» Correct Answer - B Anhydrous `HF` is a covalent compound and is strongly H-bounded . Therefore , it does not give `F^(-)` ions and hence `AlF_(3)` does not compound contains `F^(-)` ions. Therefore, it combines with `AlF_(3)` to form soluble complex, `K_(3)[AlF_(6)]` `AlF_(3) + 3KF rarr K_(3)[AlF_(6)]` |
|
| 929. |
the correct statement isA. `BI_(3)` is the weakest Lewis acid among the boron halidesB. there is minimum `ppi- ppi` back bonding in `BF_(3)`C. `BF_(3)` is the strongest Lewis acid among the other boron halidesD. there is maximum `ppi-ppi` back bonding in `BF_(3)`. |
|
Answer» Correct Answer - D There is maximum `ppi-ppi` back bonding in `BF_(3)` due to identical sizes of `2p`-orbitals of B and F. |
|
| 930. |
Write balanced equation when `NH_(3)` is dissolved in water. |
| Answer» `underset("Ammonia")(NH_(3)(g))+H_(2)O(l)tounderset("Ammoniunm hydroxide")(NH_(4)OH(aq))hArrN_(4)^(+)(aq)+OH^(-)(aq)`. | |
| 931. |
The molecular formula of inorganic benzene is `"………….."` and is obtained by heating the adduct of `"………….."` with `"………….."`. |
| Answer» Correct Answer - `B_(3)N_(3)H_(6), B_(2), H_(6), NH_(3)` | |
| 932. |
How is inorganic benzene prepared ? |
|
Answer» Borazine is calle inorganic benzene. It is prepared by heating the addition compounds of diborane with ammonia to `473K` . `3B_(2)H_(6) + 6NH_(3) overset(" Low comp. ")rarr underset( "Addition compound ")(3[BH_(2)(NH_(3))_(2)]^(+) [BH_(4)]^(-)) overset(473 K)rarr underset("Borazine")(2B_(3)N_(3)H_(6)) +12 H_(2)` For structure of borazine. |
|
| 933. |
How does `NaBH_(4)` react with iodine ? |
| Answer» Diborane is produced : `2NaBH_(4) + I_(2) rarr B_(2) H_(6) + 2Na l + H_(2)` | |
| 934. |
Boron with hydrogen forms a number of hydrides which are known are boranes. These hydrides are classified into closoboranes and nidobarances. The simplest hydride of boron is diborane. Boron apart from having `(2c, 2e)` bonds also contain `(3c, 2e)` bonds. Three centre two electron `(3c, 2e)` bond is present in :A. `BF_(3)`B. `B_(4)H_(10)`C. `H_(3)BO_(3)`D. `B_(2)H_(6) ` |
| Answer» Both `B_(4)H_(10)` and `B _(2)_(6)` are electron deficient compounds. | |
| 935. |
Atomicity of sulphur in orthorhombic ( `alpha` sulphur) isA. 1B. 2C. 8D. 6 |
|
Answer» Correct Answer - C Orthorhombic sulphur is octahedral `(S_8)` |
|
| 936. |
Which of the following hydrides shows the highest boiling point ?A. `H_2O`B. `H_2S`C. `H_2Se`D. `H_2Te` |
|
Answer» Correct Answer - A High B.P. of `H_2O` is due to association of water molecule on account of H-bonding |
|
| 937. |
A neutral fertilizer among the following isA. CANB. ammonium sulphateC. ammonium nitrateD. urea |
|
Answer» Correct Answer - A CAN (Calcium Ammonium Nitrate ) is a neutral fertilizer. It gives non-acid hydrolysis products and it decreases acidity in the soil. |
|
| 938. |
Acidic hydride of nitrogen isA. `NH_(3)`B. `N_(2)H_(4)`C. `N_(2)H_(2)`D. `N_(3)H` |
|
Answer» Correct Answer - D `[N-= N^(+)- N^(-)]^(-) [N^(-)- N^(+)-=N]^(-)` |
|
| 939. |
Which of the following hydride is most acidic ?A. `H_2Te`B. `H_2Se`C. `H_2O`D. `H_2S` |
|
Answer» Correct Answer - A Acidic nature of hydride increases from top to bottom. (`H_2O`-Least , `H_2Te`-Maximum) |
|
| 940. |
A hydride of nitrogen which is acidic in nature is :A. `NH_3`B. `N_3H`C. `N_2 H_2`D. `N_(2)H_(4)` |
|
Answer» Correct Answer - B Hydrazoic acid `(N_3H)` is a weak acid . Its weak acidic character is due to to the formation of azide ion `(N_3^(-))` after the loss of proton which is more stabilised by resonance as compared to hydrazoic acid itself. `[N-=N^(+)-N^(-)]^(-) harr[N^(-)-overset(+)(N)-=N]^(-)` |
|
| 941. |
The least stable hydride isA. `NH_3`B. `PH_(3)`C. `AsH_(3)`D. `BiH_(3)` |
|
Answer» Correct Answer - D Since , thermal stability of hydrides of nitrogen family decreases gradually from `NH_3` to `BiH_3` . Hence , `BiH_3` is the least stable hydride . |
|
| 942. |
Which element is used in the preparation of pesticides ?A. ArsenicB. BismuthC. AntimonyD. Nitrogen |
|
Answer» Correct Answer - A Pesticides are the compounds that destroy insects (pests). In ancient time , arsenic compounds were used as pesticides . |
|
| 943. |
Which of the following statements are true? (a) Only type of interactions between particles of nobel gases are due to weak dispersion forces. (b) Ionisation enthalphy of molecular oxygen is very close that of xenon. (c ) Hydrolysis of `XeF_(6)` is a redox reaction. (d) Xenon fluorides are not reactive. |
|
Answer» Correct Answer - A::D (a) Only one type of interactions between particles of noble gases are due to weak dispersion forces. (b) Ionisation enthalpy of molecular oxygen is very close to that of xenon . This is the reason for the formation of xennon oxides. Hydrolysis of `XeF_(6)overset(+6)Xeoverset(-1)F_(6)+overset(+1-2)(3H_(2)O)tooverset(+6)Xeoverset(-2)O_(3)+overset(+1-1)(3HF)` is not redox reaction . (d) Xenon fluorides are highly reactive hydrolysis readily even by traces of water. |
|
| 944. |
Which oxide is of different type than others?A. `MnO_2`B. `PbO_2`C. ` TiO_2 `D. `Na_2O_2 ` |
|
Answer» Correct Answer - D `Na_2O_2` is peroxide, all others are oxides. |
|
| 945. |
Hydrogen sulphide reacts with lead acetate forming a black compound which reacts with `H_2O_2` to form another compound. The colour of the compound isA. BlackB. YellowC. WhiteD. Pink |
|
Answer» Correct Answer - C `H_2S + (CH_3COO)_2Pb to underset"Black"(PbS) + 2CH_3COOH` `PbS+ 4H_2O_2 to underset"White"(PbSO_4) + 4H_2O` |
|
| 946. |
Oxygen gas can be prepared from solid `KMnO_4` byA. strongly heating the solidB. dissolving the solid in dil.`H_2SO_4`C. dissolving solid in dil. HClD. treating the solid with `H_2` gas |
|
Answer» Correct Answer - A `2KMnO_4 overset(Delta)to K_2MnO_4 + MnO_2 + O_2` |
|
| 947. |
In the upper layers of atmosphere ozone is formed by theA. action of ultraviolet rays on oxygenB. action of electric discharge on oxygen moleculesC. combination of oxygen moleculesD. none |
|
Answer» Correct Answer - A `O_2 overset"uv"to [O] + [O], O_2 + [O] to O_3` |
|
| 948. |
The shape of gaseous `SnCl_(2)` isA. tetrahederalB. linearC. angularD. T-shaped |
| Answer» (c ) Gaseous `SnCl_(2)` is angular with `sp^(2)`-hybridisation. | |
| 949. |
`SiH_(4)+O_(2)` mixture on bubbling through water and bubbles comming in contanct with air:A. burns with a luminous flameB. vertex rings of finely divided silica are formedC. `SiH_(4)+2O_(2)toSiO_(2)+2H_(2)O` reaction occursD. All of these |
| Answer» (d) All these are characterstics noted during the process. | |
| 950. |
On passing `SO_2` in solution of `K_2Cr_2O_7` , it turn green due to the formation ofA. `K_2Cr_2O_4`B. Chromic acidC. `Cr_2(SO_4)_3`D. `FeSO_4` |
|
Answer» Correct Answer - C `K_2Cr_2O_7 + H_2SO_4 + 3SO_2 to K_2SO_4 + Cr_2(SO_4)_3 + H_2O` |
|