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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.
| 2201. |
Which reaction cannot be ussed for the preparation of the halogen acid |
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Answer» `2KBr + H_2SO_4 (CONC.)RARR K_2SO_4 + 2HBr` |
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| 2202. |
Which of the following product is formed, when ether is exposed to air |
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Answer» Oxide |
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| 2203. |
Which category of the synthetic detergents is used in toothpastes ? |
| Answer» SOLUTION :ANIONIC DETERGENTS. | |
| 2204. |
Which of the following carbocations is least stable ? |
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Answer» `CH_(3)-CH_(2)-underset(CH_(2)-CH_(3))underset(|)overset(CH_(2)-CH_(3))overset(|)(C^(o+))` |
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| 2206. |
The set of quantum numbers for the outermost electron for copper in its fround state is |
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Answer» A) `4,1,1,+1//2` `""_(29)Cuto1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3D^(10)4s^(1)` OUTERMOST ELECTRON is 4s sub-shell For `4s" "n=4,l=0,m=0,s=+1//2` or `-1//2`. |
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| 2207. |
Which of the following isomeric amines is likely to have higher boiling point |
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Answer» `CH_(3)CH_(2)CH_(2)NH_(2)` |
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| 2208. |
Which diazonium salt is stable at room temperature |
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Answer» BENZENE diazonium CHLORIDE |
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| 2209. |
Which of the following does not react with oxygen directly? Zn, Ti, Pt , Fe |
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Answer» Solution :Platinum is a noble metal. Its ionisation ENTHALPY is very large. Therefore, it does not react with OXYGEN DIRECTLY. In contrast, Zn, Ti and Fe are active metals and hence, directly react with oxygen to FORM their respective oxides. `Zn + O_2 to ZnO_2 ` `Ti + O_2 to TiO_2` `4Fe + 3O_2 to 2Fe_2O_3` |
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| 2210. |
Which of the following compounds cannot exhibit optical isomerism? |
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Answer» `HOOC CH(OH)CH(OH)COOH` |
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| 2211. |
When the operation force between the absorbent and adsorbate is weak Vander waal's force, then it is called |
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Answer» PHYSICAL ADSORPTION |
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| 2212. |
Which oneof the followingis mainlyrequiredfor bloodclotting ? |
| Answer» Answer :D | |
| 2213. |
Which of the following tests wouldhelp in the distinsction of HCOOH and CH_(3)COOH |
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Answer» TOLLEN ' TEST |
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| 2214. |
Which of the following reaction represents Mendius reduction ? |
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Answer» `R-OVERSET(H)overset(|)C=N-OH+4[H]overset(Na//ethanol)to R-CH_(2)-NH_(2)+H_(2)O` |
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| 2215. |
whichof thefollowinghashighestboilingpoint ? |
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Answer» `CH_3COCI` |
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| 2216. |
Which of the following statements is // are incorrect ? |
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Answer» The VOLUME of a gas always INCREASES when the temperature is increased |
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| 2217. |
Two boxes A and B having their volume ratio 1: 6 and filled with Neare inter connected througha narrow tube a negligble volume Box. A is keptat 200 Kand box B at 400K . The ratioof mole of Ne gas in box B to box A is _______________ |
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Answer» |
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| 2218. |
What is the pH of boiling water (373 K )? (K_w at 373 K = 10^-12): |
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Answer» 12 |
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| 2219. |
Which of the following has the least value of pKa ? |
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Answer» A |
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| 2220. |
The volume of water added to 500 mL , 0.5 M NaOH so that its strenth becomes 10mg NaOH per mL is |
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Answer» 250 mL |
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| 2221. |
Which of the following catalyst is used in preparation of high density polythene ? |
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Answer» PEROXIDE catalyst |
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| 2222. |
Which of the following reaction(s) is/are neither sterospecific nor steroselective? |
| Answer» Solution :In `SN^(1)`, the attack by the`NU^(o-)` is not specific (attack on the carbonium ion form FRONT as well asback) and the products are mixtures of enantiormers thus neither sterospecific nor steroselective. | |
| 2223. |
What is tincture of lodine? Write its one use |
| Answer» SOLUTION :2-3% solution of IODINE in alcohol- water MIXTURE/ iodine DISSOLVED in alcohol , used as an antiseptic/ applied on WOUNDS. | |
| 2224. |
Which statement is not correct in the case of [Co(NH_3)_6]^(3+) complex : |
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Answer» It is OCTAHEDRAL in SHAPE |
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| 2225. |
Which of the following statement is not correct about an inert electrode is a cell ? |
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Answer» It does not participate in the cell reaction. |
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| 2226. |
What is the volume of particles of colloidal solution? |
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Answer» 1 nm - 100 nm |
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| 2227. |
Which one is narcotics analgesics drug ? |
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Answer» MORPHINE |
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| 2228. |
What are the component values in terms of h//2pi ) of the orbital angular momentum along the Z-direction for a 2p electron? |
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Answer» `+(1)/(2),-(1)/(2)` |
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| 2229. |
What is the product obtained when MnSo, in solution is boiled with sodium bismuthate and concentrated HNO_3? |
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Answer» `MnO_2` |
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| 2230. |
What is zone refining ? Describe the principle involved in the purification of the metal by this method. |
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Answer» Solution :Zone refining : This method is employed for preparing highly pure metal (such as silicon, tellurium, germanium), which are used as semiconductors. It is based on the principle that melting point of a substance is lowered by the presence of IMPURITIES. Consequently, when an IMPURE molten metal is cooled, crystals of the pure metal are solidified, and the impurities remain behind the remaining metal. The process consists in casting the impure metal in the form of a bar. A circular heater FITTED around this bar is slowly moved longitudinally from one end to the other. At the heated zone, the bar melts and as the heater moves on, pure metal crystallizes, while the impurities pass into the adjacent molten part. In this WAY, the impurities are swrpt from one end of the bar to the other, By repeating the process, ultra pure metal can be obtained. 
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| 2231. |
Which of the following is false regarding reversible adiabatic expansion of an ideal gas ? |
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Answer» Plot of T us V is a straight LINE with slope equal to `gamma` |
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| 2232. |
The vapourpressureof anon-idealtwocomponent solutiois givenbelow IdentifythecorrectT-Xcurvefor the samemixture, |
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Answer»
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| 2233. |
When a solid is changed into liquid the entropy |
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Answer» Decrease |
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| 2235. |
Which is a stronger reducing agent Cr^(2+) or Fe^(2+)and why ? |
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Answer» Solution :`Cr^(2+)`is a STRONGER reducing agent than `Fe^(2+)`. REASON . `E_(Cr^(3+) //Cr^(2+))^(@)`is `-ve ( -0.41V)`whereas `E_(Fe^(3+) //Fe^(2+))^(@)` is `+ve ( + 0.77V)`. THUS, `Cr^(2+)` is easily OXIDIZED to `Fe^(3+)` but `Fe^(2+)` cannot be easily oxidized to `Fe^(3+)` . Hence, `Cr^(2+)` is stronger reducing agent than `Fe^(2+)` |
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| 2236. |
What is meant by Tyndall effect? (or) Explain about the optical property of colloid. |
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Answer» Solution :(i) Colloids have optical PROPERTY. When a homogeneous solution is seen in the direction of light, it appears clear but it appears DARK in a perpendicular direction. (ii) When light passes through COLLOIDAL solution, it is scattered in all direction and it is known as Tyndall effect. (iii) The colloidal particles ABSORBS a portion of light and remaining portion is scattered from the surface of the COLLOID. Hence the path of light is made clear. |
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| 2237. |
Vapour pressure of C_6H_6 and C_7H_8 mixture at 50^@C are given by: P=179X_B+92," where "X_B" is mole fraction of "C_6H_6. Calculate (in mm): (A) Vapour pressure of pure liquids. (B) Vapour pressure of liquid mixture obtained by mixing 936 g C_6H_6 anf 736 g toluene. (C) If the vapours are removed and condensed into liquid and again brought to the temperature of 50^@C, what would be mole fraction of C_6H_6 in vapour state? |
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Answer» Solution :(A) Given, `P=179X_B+92` For pure, `C_6H_6,X_B=1` `:.P_B^@=179+92=271mm` For pure,`C_7H_8,X_B=0` `:.P_T^@=179xx0+92=92mm` (B) Now`PM=P_B^@X_B+P_T^@X_T` `271xx12/(12+8)+92xx8/(12+8)=162.6+36.8` = 199.4 mm. MOLES of `C_6H_6=936/78=12` Moles of `C_7H_8=736/92=8` (C) Now mole fraction of `C_6H_6` in VAPOUR phase of intial mixture`(X_T^/)` `(X_T^/)=P_B^(/)/P_M=162.6/199.4=0.815` Moles fraction of `C_7H_8` in vapour phase of intial mixture `(X_T^/)` `(X_T^/)=P_T^(/)/P_M=36.8/199.4=0.185` These vapours are taken out and condensed into liquid. The liquid is again BROUGHT to `50^@` to get again vapour-liquid equilibrium. Thus, mole fraction of `C_6H_6` in vapour phase of initial mixture = Mole fraction of `C_6H_6` in liquid phase on II mixture `X_B^(/)` Similarly, mole fraction of `C_7H_8` in vapour phase of initial mixture Mole fraction of `C_7H_8` in liquid phase on II mixture `X_T^(/)` New `P_M=P_B^(/)+P_T^(/)` THEREFORE, new `P_M=P_B^@X_B^(/)+P_T^@X_T^(/)` `271xx0.815+92xx0.185` mm `220.865+17.02=237.885` mm `:.` New mole fraction of `C_6H_6` in vapour phase `("New"P_B^(/))/("New"P_M)=220.865/237.885=0.928` `:.` New mole fraction of `C_7H_8` in vapour phase = 0.072 |
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| 2238. |
Two types of FXF angles are present in which of the following molecule (X = S, Xe, C) ? |
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Answer» `SF_(4)` 
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| 2239. |
Which one of the following is a Z isomer ? |
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Answer»
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| 2240. |
Which of the following primary halides is most reactive towards SN^1 reaction |
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Answer» `CH_3CH_2CH_2Cl` |
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| 2241. |
Which compound will not give position chroyl choride test? |
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Answer» Copper chloride, `CuCI_(2)` |
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| 2242. |
Which of the following is not a chromophore |
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Answer» `-NO_(2)` A compound CONTAINING only a chromophore may be coloured material but not a dye. For example azo BENZENE is red coloured but not a dye. Where as para amino azobenzene (aniline yellow) is a dye. 
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| 2243. |
Which statement is false in case of alkali metals ? |
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Answer» Lithium is the strongest REDUCING agent |
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| 2244. |
What is unit cell ? Write formula to calculate the density of a unit cell. |
| Answer» Solution :It is the smallest repeating structural UNIT of a crystalline SOLID (or CRYSTAL LATTICE ) which REPEATED in different directions produces the crystalline solid (lattice). | |
| 2245. |
Which among the following will be named as dibromidobis (ethylene diamine ) chromium (III) bromide ? |
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Answer» `[Cr(EN)_(3)]Br_(3)`<BR>`[Cr(en)_(2)Br_(2)]Br` |
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| 2246. |
Which of the following compounds reacts slower than benzene in electrophilic substitution |
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Answer»
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| 2247. |
Which of the following reaction will not give picric acid? |
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Answer» <P> |
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| 2248. |
Which of the following is not a fat soluble vitamin ? |
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Answer» VITAMIN B complex |
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| 2249. |
What is molal elevation ? Explain. |
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Answer» Solution :Increase in boiling point of a solution prepared by dissolving one gram molar mass of non volatile solute in one KILOGRAM of solvent is called as molal elevation. The boiling point of a solution is always higher than that of the pure solvent in which the solution is prepared, the elevation of boiling point ALSO depends on the number of solute MOLECULES rather than their nature. Let `T_(b)^(0)` be the boiling point of pure solvent and `T_(b)` be the boiling point point of solution. The increase in the boiling point `Delta T_(b)=T_(b)-T_(b)^(0)` is known as elevation of boiling point. For dilute solutions the elevation of boiling point `(Delta _(b))` is directly proportional to the molal concentration of the solute in a solution. Thus, `Delta T_(b)prop m` `Delta T_(b)=K_(b)m ""` ....(1) Where, m molality `K_(b)=` Boiling Point Elevation Constant or Molal Elevation Constant (Ebullioscopic CONSTAT) The unit of `K_(b)` is K kg `MOL^(-1)`. If `w_(2)` gram of solute of molar mass `M_(2)` is dissolved in `w_(1)` gram of solvent, then molality, m of the solution is given by the expression : `m=(w_(2)xx M_(2))/(w_(1)//1000)=(1000xx w_(2))/(M_(2)xx w_(1))` Substituting the value of molality in equation (1) we get `Delta T_(b)=(K_(b)xx1000xx w_(2))/(M_(2)xx w_(1))` `M_(2)=(1000xx w_(2)xx K_(b))/(Delta T_(b)xx w_(1))` 
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| 2250. |
When the ore haematite is burnt in air with coke around 2000 K along with lime, the process not only produces steel but also produces a sililcate slag that is useful in making building materials such as cement. Discuss the same and show through balanced chemical equations. |
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Answer» Solution :First by calcination and roasting, the ferrous oxide is oxidised to FERRIC oxide. Then in blast furnace, smelting is done, where it is reduced to get iron. `4FeO+O_2to2Fe_2O_3` `Fe_2O_3+COto2Fe_2O_4+CO_2` `Fe_2O_3+COto2FeO+CO_2` `FeO+COtoFe+CO_2` In the basic BESSEMER process for the manufacture of steel, the lining of the converter is MADE up of LIME. The SLAG formed consists of `Ca_3(PO_4)_2`. Phosphorous is oxidised to `P_4O_(10)` which react with lime to form slag. `P_4+SO_2toP_40_(10),6CaO+P_4O_(10)to2Ca_3(PO_4)_2` |
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