Saved Bookmarks
This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Assertion: `CO_(2)` is a gas while `SiO_(2)` is a solid at room temperature . Reason: `CO_(2)` is a covalent compound and `SiO_(2)` is an ionic solid.A. Both A and R are true and R is the correct explanatoin of AB. both A and R are true but R is the correct explanation of AC. A is true but R is falseD. A is false but R is true |
|
Answer» Correct Answer - C Reason: `CO_(2)` is a covalent compound and `SiO_(2)` is a covalent network solid. |
|
| 2. |
Silica is soluble inA. HClB. `HNO_(3)`C. `H_(2)SO_(4)`D. HF |
|
Answer» Correct Answer - D Silica `(SiO_(2))` is soluble in HF. `SiO_(2) +6HF to H_(2)SiF_(6)+2H_(2)O` |
|
| 3. |
Glass is soluble inA. `HClO_(4)`B. aqua regiaC. HFD. `H_(2)SO_(4)` |
|
Answer» Correct Answer - C Glass is soluble in HF `underset("(Present in glass)")(Na_(2)SiO_(3))+8HF to 2NaF +underset("Hydrofluorosilicic acid")(H_(2)SiF_(6)+3H_(2)O)` |
|
| 4. |
Lead sulphate is soluble inA. Conc. `HNO_(3)`B. conc. HClC. solution of ammonium acetateD. water |
|
Answer» Correct Answer - C Lead sulphate is soluble in a solution of ammonium acetate. |
|
| 5. |
Lead sulphate dissolves inA. conc. `HNO_(3)`B. `KMnO_(4)//H^(+)`C. `K_(2)Cr_(2)O_(7)//H^(+)`D. none of these |
|
Answer» Correct Answer - D Lead sulphate can easily dissolve in an aqueous solution of ammonium acetate. |
|
| 6. |
Lead pipes are not safe for transportation of drinking water becauseA. Lead forms lead oxide with waterB. water containing dissolved air reacts slowly with lead forming respective hydroxideC. they are corroded by airD. they are slowly covered with the layer of lead carbonate |
|
Answer» Correct Answer - B Poisonous `Pb(OH_(2))` formed in this reaction (Plumbosolvency) |
|
| 7. |
Agate, a very hard substances used for making knife edges etc. in blances is a form ofA. sand stoneB. soap stoneC. flintD. quartz |
|
Answer» Correct Answer - D Agate is a form of quartz. It is transluscent. `{:(" "O^("-")),(" |"),(" Si"),(" / | "),(" "O^("-") O^("-") O^("-")):}` |
|
| 8. |
Assertion : The man who fits or fixes water pipes in our homes etc. is called a plumber Reason: Pipes used for carrying water were made up of lead at one time.A. Both A and R are true and R is the correct explanatoin of AB. both A and R are true but R is the correct explanation of AC. A is true but R is falseD. A is false but R is true |
|
Answer» Correct Answer - A Both assertion and reason are correct . Lead is called plumbum in Roman |
|
| 9. |
Which of the following has no tin in its composition ?A. SolderB. BronzeC. BrassD. Tin stone |
|
Answer» Correct Answer - C Brass is an alloy of Cu and Zn. It does not contain any tin. |
|
| 10. |
Carbon dioxide is iso-structural withA. `HgCl_(2)`B. `SnCl_(2)`C. `C_(2)H_(2)`D. `NO_(2)`. |
|
Answer» Correct Answer - A::C `CO_(2),HgCl_(2)` and `C_(2)H_(2)` are iso-structural i.e., they have same shape wheras `SnCl_(2)` and `NO_(2)` have a bent shape. |
|
| 11. |
Elemental silicon has crystals structural similar toA. DiamondB. GraphiteC. `SiO_(2)`D. `P_(4)`. |
|
Answer» Correct Answer - A Diamond and silicon have similar crystal structure. |
|
| 12. |
`CO_(2)` is iso -structural withA. `SnCl_(2)`B. `HgCl_(2)`C. `SCl_(2)`D. `ZnI_(2)` |
|
Answer» Correct Answer - B::D `CO_(2),HgCl_(2)` and `ZnI_(2)` are all linear wheras `SnCl_(2)` and `SCl_(2)` are bent. Note: Use VSPER theory to predict the shape of molcules like `HgCl_(2),SnCl_(2),ZnI_(2),Scl_(2),CO_(2),NO_(2)` etc. `O=C=O,Cl: Hg: Cl,H-C=C-H,I:Zn : I` `Cl-underset(Cl)underset(|)(ddot(S)n), Cl-underset(Cl)underset(|)(ddot("S:")), ddot("O:")=underset(ddot("O:"))underset(|)(N)` `NO_(2)` is an odd electron species with one 3e-2c bond. |
|
| 13. |
On reducing with coke in electrical furnace , `SiO_(2)` givesA. `CO_(2)` and SiB. CO and SiC. CI and SiCD. SiI and CO |
|
Answer» Correct Answer - C `SiO_(2) +3C overset("Electric furnace")toSiC+2CO` |
|
| 14. |
Moderate electrical conductivity is shown byA. SilicaB. GraphiteC. DiamondD. Carborundum |
|
Answer» Correct Answer - B Out of the given four choice graphite shows moderate electrical conductivity. |
|
| 15. |
Glass reacts with HF to producesA. `Na_(3)AlF_(6)`B. `H_(2)SiF_(6)`C. `H_(2)SiO_(3)`D. `SiF_(4)` |
|
Answer» Correct Answer - B Glass reacts with HF to produce `H_(2)SiF_(6)` |
|
| 16. |
Sodium nitroprusside when added to an alkaline solution of sulphide ions producesA. red colourationB. blue colourationC. purple colourationD. brown colouration |
| Answer» Correct Answer - C | |
| 17. |
`SiO_(2)` or ordinary sand reacts withA. Conc.HClB. HFC. NaOH (hot)D. `CO_(2)` |
|
Answer» Correct Answer - B::C `SiO_(2)` reacts with HF and NaOH `SiO_(2) +4HF to SiF_(4)+2H_(2)O` `SiO_(2)+2NaOH to Na_(2)SiO_(3)+H_(2)O` |
|
| 18. |
Mica is known for itsA. good thermal conductivityB. good electrical conductivityC. good thermal insulationD. good electrical insulation |
|
Answer» Correct Answer - A::D Mica has good thermal conductivity but is an electrical insulator |
|
| 19. |
`SnCl_(2)` is usedA. as a mordant in dyeingB. as an oxidising agentC. good thermal insulationD. in the preparation of colloidal gold |
|
Answer» Correct Answer - A::B::C::D `SnCl_(2)` cannot act as an oxidising agent |
|
| 20. |
Ordinary glass isA. Sodium silicateB. Calcium silicateC. Calcium and sodium SilicatesD. Copper silicate |
|
Answer» Correct Answer - C Ordinary glass has composition. `Na_(2)SiO_(3).CaSiO_(3).4SiO_(2)` |
|
| 21. |
Which does not exist ?A. `[SiCl_(6)]^(2-)`B. `[GeF_(6)]^(2-)`C. `[C Cl_(6)]^(2-)`D. `[SnCl_(6)]^(2-)` |
|
Answer» Correct Answer - C Due to non-availability of d-subshell in the valence shell, carbon cannot exapnds its octet. As such `[C Cl_(6)]^(2-)` does not exist. |
|
| 22. |
Composition of glass isA. silica, lime, NaClB. Silica,lime, `Na_(2)CO_(3)`C. Silica,NaClD. lime, `Na_(2)CO_(3)` |
|
Answer» Correct Answer - B Ordinary glass is obtained from silica, lime and `Na_(2)CO_(3)`. |
|
| 23. |
Red lead isA. PbOB. `Pb_(3)O_(4)`C. `PbO_(2)`D. `Pb_(4)O_(3)` |
|
Answer» Correct Answer - B Red lead is `Pb_(3)O_(4)`. |
|
| 24. |
From the oxides those given below which is neutral in characterA. PbOB. COC. SiOD. `GeO_(2)` |
| Answer» Correct Answer - B | |
| 25. |
Which of the following shows bonds in silicones ?A. Si-Si -Si-SiB. Si-C-Si-o-SiC. Si-C-Si-C-SiD. `-Si-O-Si-O-Si` |
|
Answer» Correct Answer - D silicones contain -Si-O-Si-O-Si- back bone. |
|
| 26. |
The nature of bonds compound of C and Si isA. ElectrovalentB. CovalentC. MetallicD. Convalent and electrovalent |
|
Answer» Correct Answer - C Covalent bonds formed by sharing of electrons. |
|
| 27. |
Which of the following bonds the has highest bond energy ?A. C-CB. Si-SiC. Ge-GeD. S-S |
|
Answer» Correct Answer - A C-C bond is strongest and has highest bond energy because carbon atoms are smaller in size. |
|
| 28. |
Graphite isA. harder than diamondB. is a bad conductor of electricityC. used as a lubricantD. an amorphous allotropic form of carbon |
|
Answer» Correct Answer - C Graphite is soft and it used as lubricant particularly at high temperature |
|
| 29. |
The number of water molecules present in butter often is .......... |
|
Answer» Correct Answer - 5 Butter of tin is `SnCl_(4).5H_(2)O` `:. ` number of water molecules =5 |
|
| 30. |
Colloidal solution of graphite isA. Oil dagB. Aqua dagC. Lamp blackD. Anthracite |
|
Answer» Correct Answer - B Oil dag is a suspension of graphite in oil whereas anthracite and lamp back are purest and softest forms of carbons respectively. |
|
| 31. |
The stability of +2 oxidation state of Pb can be explained on the basis ofA. electronic configurationB. inert pair effectC. resonanceD. small size of `Pb^(2+)` ion. |
|
Answer» Correct Answer - B Inert pair effect |
|
| 32. |
which of the following statements is not true for carbon ?A. It forms compouds with multiple bondsB. Its ionisation energy is very highC. It undergoes catenationD. it shows inert pair effect |
|
Answer» Correct Answer - D Carbon does not show inert pair effect. Tendency to show inert pair effect is more as we move down the group. |
|
| 33. |
which of the following statements is false with respect to group 14 elements. ?A. The stability of +4 oxidation state decreases as we move down the groupB. The +4 oxidation state is more common in carbon and siliconC. `Pb^(4+)` is more stable than `Pb^(2+)` ions.D. The stability of +2 oxidation state increases on moving down the group due to inert pair effect. |
|
Answer» Correct Answer - C Statement is wrong because, due to inert pair effect, the stability of lower oxidation state (+2) increases down the group while stability of higher oxidation state (+4) decreases donw the group. So `Ge^(2+) lt Sn^(2+) lt Pb^(2+) ` and `Ge^(4+) gt Sn^(4+) gt Pb^(4+)` |
|
| 34. |
Carborundum is the commercial name ofA. `Al_(2)(SO_(4))_(3)`B. `Al_(2)O_(3).2H_(2)O`C. `AlCl_(3)`D. SiC. |
|
Answer» Correct Answer - D Carborundum is SiC. |
|
| 35. |
Carborundum is the commercial name ofA. `Al_(2)O_(3)`B. SiCC. `SiO_(2)`D. `HPO_(3)` |
|
Answer» Correct Answer - B SiC is called carborundum whereas `Al_(2)O_(3)` is called corundum. |
|
| 36. |
Coal gas may be called a mixture ofA. `CH_(4)` and `C_(2)H_(4)`B. `H_(2)` and `CH_(4)`C. `H_(2)` and `C_(2)H_(4)`D. `CO` and `CO_(2)`. |
|
Answer» Correct Answer - B Coal gas is a mixture of `H_(2),CH_(4),CO , C_(2)H_(4),O_(2),N_(2)` etc. with `CH_(4)=32%, H_(2)=4%, C_(2)H_(4)=3%` |
|
| 37. |
Which of the following compound has peroxide linkage ?A. `Pb_(2)O_(3)`B. `SiO_(2)`C. `PbO_(2)`D. `CO_(2)` |
|
Answer» Correct Answer - C It has peroxide linkage `O_(2)^(2-)`. |
|
| 38. |
Butter of tin is:A. `SnCl_(4).6H_(2)O`B. `SnCl_(4).4H_(2)O`C. `SnCl_(4).5H_(2)O`D. `SnCl_(2).2H_(2)O` |
|
Answer» Correct Answer - C Butter of tin is `SnCl_(4).5H_(2)O` |
|
| 39. |
Which one of the following is correct set of `SiO_(2)`A. Linear,acidicB. Linear ,basicC. Tetrahedral , acidicD. Angular , disc |
|
Answer» Correct Answer - C `SiO_(2)` is an acidic oxide and each Si atom in `SiO_(2)` is in tetrahedral configuration. |
|
| 40. |
The structure and hybridization of `Si(CH_(3))_(4)` isA. bent, spB. trigonal, `sp^(2)`C. octahedral , `d^(2)sp^(3)`D. tetrahedral, `sp^(3)` |
|
Answer» Correct Answer - D In `Si(CH_(3))_(4)`.Si is `sp^(3)` -hybridised with a tetrahedral configuration |
|
| 41. |
Which one of the following molecules is linear ?A. `CO_(2)`B. `H_(2)O`C. `NO_(2)`D. `SO_(2)` |
|
Answer» Correct Answer - A O=C=O The C atom in `CO_(2)` undergoes sp-hybridisation. It has a linear structure. |
|
| 42. |
An allotrope X of group 14 element on oxidation with conc. `HNO_(3)` gives graphite acid. The X isA. DiamondB. `beta`-snC. `alpha`-snD. graphite |
|
Answer» Correct Answer - D Graphite on oxidation with conc. `HNO_(3)` gives graphite acid. |
|
| 43. |
The shape of gaseous `SnCl_(2)` isA. TetrahedralB. LinearC. AngularD. T - shaped |
|
Answer» Correct Answer - C Shape of `SnCl_(2)` is angular (`Cl : ddot(S)n : Cl`) Use VSEPR theory to predict the shape. |
|
| 44. |
The shape of terahalides of group 14 element isA. Square planarB. Trigonal bipyramidC. OctahedralD. Tetrahedral |
|
Answer» Correct Answer - D Tetrahedral `{:(" X"),(" |"),(" M"),(" / | "),(" X X X"):}` `sp^(3) ` hybridisation |
|
| 45. |
The first ionisation energy of silicon is lower than that ofA. AluminiumB. carbonC. potassiumD. calcium |
|
Answer» Correct Answer - B Carbon because silicon has larger size. |
|
| 46. |
A silicate used in talcum powderA. consists of planar sheets which can slip over anotherB. is known as talcC. is a pure magnesium silicate of the form `3MgO.4SiO_(2).H_(2)O`D. All of these |
|
Answer» Correct Answer - D All of these are the characterstics of talc used in talcum powders. |
|
| 47. |
`SiO_(2)` is reacted with sodium carbonate. What is the gas liberated ?A. COB. `O_(2)`C. `CO_(2)`D. `O_(3)` |
|
Answer» Correct Answer - C `SiO_(2)+Na_(2)CO_(3) overset(Delta)toNa_(2)SiO_(3)+CO_(2)` |
|
| 48. |
Silicon carbide is used asA. a solventB. a dehydrating agentC. an abrasiveD. catalyst |
|
Answer» Correct Answer - C Silicon carbide is quite hard and is used an abrasive |
|
| 49. |
Tungsten carbide is an example ofA. substiutional solid solutionB. passive solid solutionC. sandwich solid solutionD. iterstitial solid solution |
|
Answer» Correct Answer - D Tungusten carbide is an example of intersitial solid solution. |
|
| 50. |
The soldiers of Napoleon army while at Alps during freezing winter suffered a serious problem with regard to the tin buttons of their uniform. White metallic tin buttons get converted to grey poweder. This transformation is relate toA. an interaction with nitrogen of the air at very low temperaturesB. a change in the crystalline struture of tinC. a change in the partial pressure of oxygen in the airD. an interaction with water vapour contained in the humid air |
|
Answer» Correct Answer - B Transitin of white to grey tin occurs at any temperature below `15.2^(@)C`, it becomes rapid at `-50^(@)C` . The conversion of white tin to grey tin (as in cold countries) is accompanied by an increases in volume and the latter, being very brittle, easily crumbles down to powder (a charge in crystallines structure of tin). |
|