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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.
| 51. |
Assertion (A) : Silicones are hdyreopbhobic in nature . Reason (R) : `Si -O - Si` likages are moisture sensitive .A. If both (A) and (R) are correct and (R) is correct explanation of (A)B. If both (A) and (R) are correct and (R) is not correct explanation of (A)C. If (A) is correct , but (R) is incorrectD. If (A) is incorrect but (R) is correct |
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Answer» Correct Answer - C Corrct reason : Si atoms in silicones are surrounded by non -polar alkyl groups , which repel water molecules . |
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| 52. |
Assertion (A) : Silicones are hdyreopbhobic in nature . Reason (R) : `Si -O - Si` likages are moisture sensitive .A. If both (A) and (R) are correct and (R) is correct explanation of (A)B. If both (A) and (R) are correct and (R) is not correct explanation of (A)C. If (A) is correct , but (R) is incorrectD. If (A) is incorrect but (R) is correct |
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Answer» Correct Answer - C Corrct reason : Si atoms in silicones are surrounded by non -polar alkyl groups , which repel water molecules . |
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| 53. |
One carat = ……………….. Mg. |
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Answer» Correct Answer - ` 200` ` 200` |
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| 54. |
When `PbO_2` reacts with a dilute acid . It gives bydrogent peroxide . |
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Answer» `PbO_2` with dilute acid does not give hydrogen peroxide becauses it does not have a peroxide bond in it `(2 PbO_2 + 2H-2SO_4 rarr 2PbSO_4 +2 H-2O +O_2uarr)`. |
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| 55. |
When `PbO_2` reacts with cone `HNO_3`, ………………… gas is evolved . |
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Answer» Correct Answer - `O_2` ` O_2` |
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| 56. |
Graphite when heated with cone `HNO_3` forms a yellow mass known as …………………, |
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Answer» Correct Answer - `Graphite actd ` (C_(11) H_4 O_5)` Graphitic ancid `(C_(11) H_4 O_5)` |
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| 57. |
When `PbO_2` reacts with cone `HNO_3`, the gas (es ) evolved is//are .A. `NO_2`B. `O_2`C. N_2`D. N_2O` |
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Answer» Correct Answer - B When `PbO_2` reacts with cone `HNO_3`, the gas evelved is oxygen `(2 PbO_2 + 4 H NO_3 rarr 2 Pb (NO_3)_2 +O_2 2 H_2O)`. |
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| 58. |
` CO` is used as a reducing agent . |
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Answer» Correct Answer - T Since `CO` gets easily oxidised to `CO_2`, it acts as a powerful reducing agent . |
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| 59. |
`H_2SO_4` is not used for the preparation of ` CO_2` from marble chipsm as the reaction is vigorrous . |
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Answer» Correct Answer - F `H_2SO_4` reacts with marble `(CaCO_3)` `H_2 SO_4+CaCO_3rarrCaSO_4 narr +CO_2+H_2O` and the `CaSO_4` so formed being sparingly soluble gets deposited on marble chips and thus the reaction stops . |
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| 60. |
Carbon exhibits coordination number of six. |
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Answer» Correct Answer - F Due to the absence of d-orbitals in valence shell of carbon , its maxium corrdination number is four . |
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| 61. |
Carbon terachloride behaves as a Lewis acid . |
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Answer» Correct Answer - F Due to the absence of vacant orbitals of suitable energy on cannot behaves as a Lewis acid . |
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| 62. |
Phosgene is the common namegiven to phosphine . |
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Answer» Correct Answer - F Phosgene is `COCl_2` and phosphine is `PH_3`. |
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| 63. |
Complete the following reaction: `Sn+2KOH+4H_(2)Orarr`……+……. |
| Answer» ` Sn +2KOH + H_2O rarr K_2SnO_3+2H_2` | |
| 64. |
In the first biological applicativon of bucky ball , chemists at the University of Califorminaat San `F` Francisoc and Santa Barbra made a discovery in ` 1993` that could help I designing drugs to rtreat `AIDS`. The human immunodeficienrcy virus (HIV) that causes AIES reproduces by syntheising a long protein chain , which is cut into smaller segments by an enzymecalled HiV-proteases . ONe way to stop AIDS, then might be to inacivate the enzyme. when the chemists reacted a water-soluble derivative of bucky ball with HIV-protease , they found that itbinds to the portion of th enzyme that would ordinarily clareve the repreouctive protein , preventing the HIV virus from reproducing . Consequently the virus could no bnolgre infect the human cells they had frown in the laboratory . The buycky ball compound itself is not a suitable drug for use against AIDS because of potential side effects and delivery difficaultes , but it does provide a model for the development of such drugs . What is the formula fo the bucky ball ?A. `P_(4)`B. `S_(8)`C. `Ti_(3)`D. `C_(60)` |
| Answer» Correct Answer - D | |
| 65. |
In the first biological applicativon of bucky ball , chemists at the University of Califorminaat San `F` Francisoc and Santa Barbra made a discovery in ` 1993` that could help I designing drugs to rtreat `AIDS`. The human immunodeficienrcy virus (HIV) that causes AIES reproduces by syntheising a long protein chain , which is cut into smaller segments by an enzymecalled HiV-proteases . ONe way to stop `AIDS`, then might be to inacivate the enzyme. when the chemists reacted a water-soluble derivative of bucky ball with HIV-protease , they found that itbinds to the portion of th enzyme that would ordinarily clareve the repreouctive protein , preventing the ` HIV` virus from reproducing . Consequently the virus could no bnolgre infect the human cells they had frown in the laboratory . The buycky ball compound itself is not a suitable drug for use against AIDS because of potential side effects and delivery difficaultes , but it does provide a model for the development of such drugs In bucky bucky ball each atom is :A. `sp^2`-hybridised element with extensive delocalised molecular orbitalB. `sp^2 `-hybridised element withlocalised molecular orbital .C. `sp^2-`hybridised element with delocalisd molecular orbital .D. `sp^3-`hybridsed element with localised molecular orbital . |
| Answer» Correct Answer - A | |
| 66. |
In the first biological applicativon of bucky ball , chemists at the University of Califorminaat San `F` Francisoc and Santa Barbra made a discovery in ` 1993` that could help I designing drugs to rtreat `AIDS`. The human immunodeficienrcy virus (HIV) that causes AIES reproduces by syntheising a long protein chain , which is cut into smaller segments by an enzymecalled HiV-proteases . ONe way to stop `AIDS`, then might be to inacivate the enzyme. when the chemists reacted a water-soluble derivative of bucky ball with HIV-protease , they found that itbinds to the portion of th enzyme that would ordinarily clareve the repreouctive protein , preventing the ` HIV` virus from reproducing . Consequently the virus could no bnolgre infect the human cells they had frown in the laboratory . The buycky ball compound itself is not a suitable drug for use against AIDS because of potential side effects and delivery difficaultes , but it does provide a model for the development of such drugs Consider following statements about bucky ball : A , It is also called fullerene B: It is also called Buckministerfullerene C: Bucky tubes (made of fullerenes ) are several times stronger than stel whnires D: Bucky ball is a plastic polymer Select correct statement (s) :A. `A,C,D`B. `A,B,C`C. `A,B,D`D. `B,C,D` |
| Answer» Correct Answer - B | |
| 67. |
`Pb_3O_4` is regrded as a compound oxide of `PbO` and `PbO_2`. How many part of ` PbO_2` are present in it ? |
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Answer» Correct Answer - 1 `Pb_3O_4` is a mixture of `2`parts of `PbO` and `1` part of ` PbO_2`. |
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| 68. |
What of the following anions are present in clay ?A. `Al_2O_3`B. `CO`C. `CO_2`D. `CaO` |
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Answer» Correct Answer - C `H_2CO_3 hArr H_2 O +CO_2` Hence , `CO_2` is a true acid anhudride. |
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| 69. |
Which of the following structure is similar to graphite e?A. ` B_4C`B. `B_2H_6`C. `BN`D. `B` |
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Answer» Correct Answer - C Graphite and BN (boron nitride ) have layer structures . |
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| 70. |
Pyro-silicates are formed byA. ` SiO_4^(4-)` tetrahedraB. `(Si_2O_7^(6-))`C. `(Si_O_3^(2-))`D. `(Si_2O_5^(12-))` |
| Answer» Correct Answer - B | |
| 71. |
Assertion (A) : `SnCl_2` has high meling point , whereas `snCl_4` has low melting point . Reason (R) : ` SnCl_4` has ionic nature whereas `SnCl_4` is covalent compound invloving `sp^3` hyvdridsation .A. If both (A) and (R) are correct and (R) is correct explanation of (A)B. If both (A) and (R) are correct and (R) is correct explanation of (A)C. If (A) is correct , but (R) is incorrectD. If (A) is incorrect but (R) is correct . |
| Answer» Correct Answer - A | |
| 72. |
Double cahin structures are present in asbsestor . Which of the anion are present in them ?A. `(Si_2O_5^(2-))_n`B. `(Si_2O_(12)^(6-))_n`C. `(Si_2O_3^(2-))_n`D. `(Si_2O_4^(4-))_n` |
| Answer» Correct Answer - B | |
| 73. |
Which of the following anion are prescnt in caly ?A. `(Si_2O_5^(2-))_n`B. `(Si_4O_(11)^(6-))_n`C. `(SiO_3^(2-))_n`D. `(Si_O_4^(4-))_n` |
| Answer» Correct Answer - A | |
| 74. |
`K_2 C_6 O_6` is called .A. Postassium per carbonteB. Postassium permono carbonteC. Potassium perdicarbonateD. Potassiuym subacarbnonate |
| Answer» Correct Answer - C | |
| 75. |
Which among the following statements are correct ?A. Aquadig and oildig are made up of graphiteB. Graphite reacts with conc `HNO_3` acid to form mellitic acid ` C_6 (COOH)_6`C. both `CO` and `C_3 O_2` are toxicD. Zircon `(ZrSiO_4)` is a gemstone . |
| Answer» Correct Answer - A::B::D | |
| 76. |
Assertion (A) : Carbon forms covalent compounds buyt lead dorms ionic compounds Reason (R) : crabon can les foure electrons to forem `C^(4+)` ion but lead connot .A. If both (A) and (R) are correct and (R) is correct explanation of (A)B. If both (A) and (R) are correct and (R) is not correct explanation of (A)C. If (A) is correct , but (R) is incorrectD. If (A) is incorrect but (R) is correct |
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Answer» Correct Answer - C Conrrect reason : Carbon can only share elecrons to foerm covalent bonds . |
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| 77. |
Carbon forms a large number of compounds due to :A. TertravalencyB. Variable valencyC. Large chemical affinityD. Property of catention |
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Answer» Correct Answer - D (All are factual statememnts.) |
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| 78. |
The incorrect statement (s0 among the following is //are :A. `Nci_5` does not exist buyt `PCl_5` doesB. Lead prefers to form tetravalent compoundsC. The three `C-O` bonds are not equal in the `CO_3^(2-)` ion.D. Both ` O_2^(o+)` and `NO` are paramagnetic . |
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Answer» Correct Answer - B::C Lead prefers to form divealent compound due to inert pair effect . All the three `C-O` bonds are equal in ` CO_3^(2-)` ion due to resonace . |
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| 79. |
Which of the following species are not known ?A. ` [SiCl_6 ]^(2-)`B. `[CF_6]^(2-)`C. `[PbCl_6]^(2-)`D. `[SiF_6]^(2-)` |
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Answer» Correct Answer - B::D Due to the absence of vacant d-orbital in its valenrc shell, carbon cannot expand its coordinatyion number beyond four , hence `[ CF_6 ]^(2-)` is not known. Due to inert pair effect `Pb^(2+)` compounds are highly unstable and gets reduced to `Pb^(4+)` compounds are highly ustabnle and gets reduced to `pb^(2+)` compounds . |
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| 80. |
With respect to graphite and diamond, which of the statements given below are correct? (1) Graphite is harder than diamond. (2) Graphite has higher electrical conductivity than diamond. (3) Graphite has higher thermal conductivity than diamond.(4)Graphite has higher `C-C` bond order than diamond.A. Graphite is hareder than diamond.B. graphite has higher electrical conductivity than diamond.C. Graphite has higher thermal conductivity than diamondD. Graphite has higher ` C-C` bodn ordr tha diamond . |
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Answer» Correct Answer - B::D a. Diamon has a three-dimensional network structure . Whereas graphite is soft due to layerd structure . b. In graphite only three valence electrons are invelved in bonding and one eelctron remains free, giving electricla conductivity . In diamond all the four valece electrons are covelently bonded hence insulator . c. Diamond is a better thermal conductor than graphite Electrical conductivity is due to availbitity of electrons . Thermal condctance is due to transfer of thermal vibrational enrgy form one atom to another atom .`A` compact and prectisely movement of heat . d. In graphite , `C-C` bond acquires some double bond charcte and hence has higher bond order than in diamond . |
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| 81. |
The hydroglysis of trialkychlorosilane , `R_3 SiCl`, yields …………………….., |
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Answer» Correct Answer - C The hydrolysis of trialkychlorsilance, `R_3 SiCl`, yields `R_3 Si (OH) ` with may further form a dimer . |
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| 82. |
Assertion (A) : Diamond does bnot reflect light . Reason (R) : Diamond has low refractive index.A. If both (A) and (R) are correct and (R) is correct explanation of (A)B. If both (A) and (R) are correct and (R) is not correct explanation of (A)C. If (A) is correct , but (R) is incorrectD. If (A) is incorrect but (R) is correct |
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Answer» Correct Answer - C Correct reason : Diamondreflects light . It has a high refractive index. |
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| 83. |
The number and type of bonds between two carbon atoms in `CaC_(2)` are:A. One singma and one pi bondB. One sigam two pi bond .C. One sigam and one half pi bond .D. One sigma nond. |
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Answer» Correct Answer - B `Ca^(2+) [ C-= C]^(2-) ( 1 isgma and 2pi)`. |
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| 84. |
Marsh gas is …………………… |
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Answer» Correct Answer - `CH_2` `CH_4` |
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| 85. |
What is the perecntge of lead in lead pencil ? |
| Answer» Lead pencils do not contain but it is fraphite . | |
| 86. |
Lead pencil is made up of ………………….. |
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Answer» Correct Answer - Graphite Graphite |
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| 87. |
Among group `14` elements , …………….. Has the least tendency to undergo catention . |
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Answer» Correct Answer - Lead Lean . |
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| 88. |
which of the following statement is not correct ?A. Silicon is extenstively used as a semiconductorB. Carborundum si ` SiC.`C. Silicon occurS in free state in natureD. Mica contains the element silica. |
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Answer» Correct Answer - C Si occures as silicates in nature . |
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| 89. |
Which of the following is chemically inative allotropic form fo carbnon ?A. CoalB. DiamondC. CharcoalD. AnimAl charcoal |
| Answer» Correct Answer - B | |
| 90. |
A mong the following substitute stlanes the one which will give rese to cres - linked silicaone plolymer on ghydrolysis is :A. ` R_3SiCl`B. `R_4Si`C. `RSiCl_3`D. `R_2SiCl_2` |
| Answer» Correct Answer - C | |
| 91. |
a. Whick is more efficient fuel : water gas or pr producer gas ? b. The formular for mineral oliving e `(Fe. Mg )_(2) SiO_(4)` means that `2` mol of any combination fo the metal ions is present pf definite proporiton ? Is ovivine a compound or a solid solution . |
| Answer» a. Whater gas is an ewuimlecular mixture of `CO` and `H_2` in which both `CO` and `H_2` burn and evolue heat , wherease producer gas is a mixure of `CO` and `N_2` in which only `CO` burn and evolve heat . Thus , water gas is better or more efficent fuel thean producesr gas , since the catter or more efficient fuel than producer gas , since the canlroific value of water gas will be more than that of producer gas . | |
| 92. |
Producer gas is a mixture ofA. ` CO+ N_2`B. `N_2+H_2`C. `CO +H_2`D. `CO_2+H_2O` |
| Answer» Correct Answer - A | |
| 93. |
Assertion (A) : The compound `(CF_3)_3 N` shows almost no hasic character eve though `(CH_3 )_3 N` does . Reason (R) : Theer is no hydrogen bonding in ` (CF_3)_3N`.A. If both (A) and (R) are correct and (R) is correct explanation of (A)B. If both (A) and (R) are correct and (R) is not correct explanation of (A)C. If (A) is correct , but (R) is incorrectD. If (A) is incorrect but (R) is correct . |
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Answer» Correct Answer - B Correct reason : `CF_3` is a strong electron withdraving group and hence availabillity of lone paire on N-atoms is very less . Hence it does not show any bsic charracter . |
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| 94. |
Carnon shows tetravelency due to .A. `sp^3` hybridisationB. `dsp^2` hybridsationC. `sp^2` hybridisationD. All of these |
| Answer» Correct Answer - A | |
| 95. |
Solder is an alloy of :A. ` 70% Pb 30% Sn`B. ` 33 % Pb . 687% Sn`C. `80% Pb. 20% Sn`D. `90% Cu 10%Sn` |
| Answer» Correct Answer - B | |
| 96. |
A when added to silica gives ` B. A` and (B) are :A. `HF, H_2 SiF_4`B. `HCl, H_2 SiCl_6`C. `HCl, H_2 SiCl_6`D. `HI, H_2 SiI_6` |
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Answer» Correct Answer - A `underset ((A)) ( 4 HF ) + SiO _2 rarr underset ((B)) (H_2SiF_4) +H_2O`. |
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| 97. |
Which of the following has least tendncy to undegrgo catentaion ?A. `C`B. `Si`C. `Ge`D. Sn` |
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Answer» Correct Answer - D Down the grop `(darr), M-M` bond strength decreass and bence the tendncy of undergo cateneation ssalso decreases. |
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| 98. |
Maximi, ahility of catenation is shown by ………………………. , |
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Answer» Correct Answer - Carbon Carbon |
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| 99. |
On fusion of a mixture of `Na-2CO_3` and ` CaCO_3` with silica at `1500^@C`, a liquid consisting of silicatees of sdium and calcium is formed. On cooling . Liquid become viscous and eventually ceasesto flow . It becomes solid and is known as flass. By varying the proportions of the three basic ingredients and by adding other substances, the properties of glass can be altered, Glass can be represented as `R_2 O. MO.6SiO_2`, where `R= Na` or `K, M = CaBa, Zn` or `pbSiO_2` may be replaced by `Akl_2 O_3 , b_2 O_3` or `P_2 O_5`. Colourd glasses are obtained by adding certain metallic oxdes or salts in the fused mass, Glass is attached by `HF` and this property is used to make marking on the galss , This is known as etching . The glass on rapid coolling becomes brittle and fragile . The artciles of glass are cooled neither slowly nor very rapidly . The process of graducal cooling of flass iscalled annealing . Ordinary flass is .A. Sodium silicate andsilicaB. Calcium silicate and silicaC. Porassium silicate and silicaD. Mixture of sodium and calcium silicates with siilca |
| Answer» Correct Answer - D | |
| 100. |
On fusion of a mixture of `Na-2CO_3` and ` CaCO_3` with silica at `1500^@C`, a liquid consisting of silicatees of sdium and calcium is formed. On cooling . Liquid become viscous and eventually ceasesto flow . It becomes solid and is known as flass. By varying the proportions of the three basic ingredients and by adding other substances, the properties of glass can be altered, Glass can be represented as `R_2 O. MO.6SiO_2`, where `R= Na` or `K, M = CaBa, Zn` or `pbSiO_2` may be replaced by `Akl_2 O_3 , b_2 O_3` or `P_2 O_5`. Colourd glasses are obtained by adding certain metallic oxdes or salts in the fused mass, Glass is attached by `HF` and this property is used to make marking on the galss , This is known as etching . The glass on rapid coolling becomes brittle and fragile . The artciles of glass are cooled neither slowly nor very rapidly . The process of graducal cooling of flass iscalled annealing . Glass is .A. SolidB. LiquidC. Supercooled liquidD. Colloidal solution |
| Answer» Correct Answer - C | |