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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.
| 89201. |
(A) HCl most volatile hydrogen halide (R ) HCl has lowest boiling point |
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Answer» Both (A) and (R ) are true and (R ) is the CORRECT EXPLANATION of (A) |
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| 89202. |
(a) Justify the following : (i) Sleeping pills are recommended to patients suffering from sleeplessness but it is not advisable to take them without consulting the doctor. (ii) Why do we require artificial sweetening agents ? (b) Write the composition of Dettol. |
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Answer» Solution :(a) (i) It is not advisable to take SLEEPING pills WITHOUT consulting the DOCTOR. This is because most of the drugs ACT as poison in higher doses and might even lead to death. (ii) We require artificial sweetening agents to reduce calorie intake and as a substitute for sugar. (b) It contains a mixture of CHLOROXYLENOL and terpineol. 
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| 89203. |
(A): HBr is stronger acid than HI. (R) : Bromine is more electronegative than iodine. |
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Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT explanation of (A) |
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| 89204. |
A hard and resistant metal (alloy) genrally used in tip of nib of fountain pen is |
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Answer» OS. Ir |
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| 89205. |
(A) K_2Cr_2O_7 is used as primary standard in volumetric analysis. (R) It has a good solubility in water. |
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Answer» Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A) |
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| 89206. |
A handbook states that the solubility of methylamine CH_3NH_2(g) in water at 1 atm pressure at 25^@ Cis 959 volumes of CH_3NH_2 (g) per volume of water (pK_(b)=3.39). What molarity NaOH (aq.) would be required to yield the same pH ? |
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| 89207. |
A jug contains 2 L of milk. Calculate the volume of milk in m^(3). |
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| 89208. |
A handbook states that the solubility of methylamine CH_3NH_2(g) in water at 1 atm pressure at 25^@ Cis 959 volumes of CH_3NH_2 (g) per volume of water (pK_(b)=3.39). Estimate the max. pH that can be attained by dissolving methylamine in water. |
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| 89209. |
(A) : IUPAC name of valeric acid is pentanoic acid . (R) : Valeric acid is prepared from valerian plant roots . |
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Answer» Both A & R are TRUE , R is the correct explanation of A |
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| 89210. |
(A) IUPAC name of the compoundCH_3 - undersetoverset(|)(CH_3)(C)H - O - CH_2 - CH_3is(R) In IUPAC nomenclature, ether is regarded as hydrocarbon derivative in which a hydrogen atom is replaced by -OR or-OAr group [where R = alkyl group and Ar = aryl group] |
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Answer» Both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A) |
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| 89211. |
(A) IUPAC name of is 2-ethoxy1,1,-dimethyl cyclohexane(R) According to IUPAC, ethoxy group is a functional group and named in the above compound by giving priority to the ethoxy group |
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Answer» Both (A) and (R) are true and (R) is the correct EXPLANATION of (A) |
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| 89212. |
(A): IUPAC name of [Pt Br (en) Cl, is dibromobis (1, 2-ethane diamine) platinum (IV) chloride. (R): (en) represents ethylenediamine and it is a ligand where prefix di- is already included in its designation. |
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Answer» Both (A) and (R) are TRUE and (R) is the correct EXPLANATION of (A) |
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| 89213. |
(A) Halogens have maximum negative electron gain enthalpy in the respective periods of the periodic table (R ) Halogens have the smallest size in their respective periods and high effective nuclear charge |
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Answer» Both (A) and (R ) are true and (R ) is the correct explanation of (A) |
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| 89214. |
(A) : IUPAC name of [Co(H_(2)O)_(4)Cl_(2)]Cl.2H_(2)O is tetraaquadichlorocobalt(III) chloride. (R) : Water of crystallisation is represented by Arabic numerical before its name |
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Answer» Both A & R are true, R is the CORRECT explanation of A |
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| 89215. |
A hard and resistant alloy generally used in tip of nib of pen is : |
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Answer» OS , Ir |
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| 89216. |
(A) Halogens are coloured (R ) Colour is a characristic property of elements of d- block |
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Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT explanation of (A) |
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| 89218. |
A halogen (x) reacts with sulphur gives a compound (y) .(y) reacts with ethylene to give Mustard gas . Then |
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Answer» `x=Cl_(2),y=S_(2)Cl_(2)` |
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| 89219. |
A is an optically inactive alkyl chloride which on reaction with aqueous KOH gives B. B on beating with Cu at 300°C gives on alkene C, what areA and C |
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Answer» `CH_(3)CH_(2)CL, CH_(2)=CH_(2)` |
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| 89220. |
A halogen compound on hydrolysis with dilute alkali followed by acidification gives acetic acid. The compound is : |
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Answer» `CH_(3)CH_(2)Cl` |
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| 89221. |
A halogen compound A on hydrolysis with dilute alkali followed by acidification gives acetic acid. The compound X is |
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Answer» `ClCH_(2)CH_(2)Cl` |
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| 89222. |
A is an aqueous acid, B is an aqueous base. They are diluted separately, then |
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Answer» pH of A increases and pH of B decreases |
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| 89223. |
(A) Half life period of first order reaction is independent of concentration of the reactant (R ) 99.9% reaction of first order reaction completes in 10 half lives (A.P Agri - 2017 ) |
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Answer» Both (A) and (R ) are true and (R ) is the CORRECT EXPLANATION of (A) |
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| 89224. |
(A) Half-life period of a reaction of first order is independent of initial concentration. (R ) Half-life period for a first order reaction is equal to (2.303)/(K)log2 |
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Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT EXPLANATION of (A) |
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| 89225. |
A is a lighter phenol and B is an aromatic carboxylic acid . Separation of a mixture of A and B can be carried out easily by using a solution of |
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Answer» sodium HYDROXIDE `R-COOH + NaHCO_(3) to R-COO^(-)NA^(+) + H_(2)CO_(3)` |
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| 89226. |
(A) Half-life period is always independent of initial concentration. (R ) Half-life period is inversely proportional to rate constant. |
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Answer» Both (A) and (R ) are true and (R ) is the correct EXPLANATION of (A) |
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| 89227. |
A is a king of acid. A reacts with HBr to give B and Bromine. A reacts with Na_(2)CO_(3) to give C and carbon dioxide. Identify A, B and C. Give the reaction. |
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Answer» Solution :(i) King of ACID is sulphuric acid (A). (ii) Sulphuric acid (A) reacts with `HBr` reacts with HBr to give `SO_(2)(B)` and Bromine. `underset("(A)")(H_(2)SO_(4))+2HBrrarr underset("(SULPHUR DIOXIDE)(B)")(SO_(2))+2H_(2)O+Br_(2)` (i) Sulphuric acid (A) reacts with `Na_(2)CO_(3)` to give sodium sulphate (C) and `CO_(2)`. `Na_(2)CO_(3)+underset("(A)")(H_(2)SO_(4))rarr underset("(Sodium sulphate) (C)")(Na_(2)SO_(2))+H_(2)O+CO_(2)` `|{:(A,"Sulphuric acid",H_(2)SO_(4)),(B,"Sulphur dioxide",SO_(2)),(C,"Sodium sulphate",Na_(2)SO_(4)):}|` |
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| 89228. |
A half-cell reaction is one that |
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Answer» takes place at one ELECTRODE |
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| 89229. |
(A): Hair washed with soap and hard water looks dull. (R): Calcium and magnesium salts soaps are 1 insoluble in water. |
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Answer» Both (A) and (R) are true and (R) is the correct EXPLANATION of (A) |
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| 89230. |
(A)is a colourless solid, itmetal when heated and gives of a gas (B) Which is supporter of combustion , if heating is contimed the white of the solid disuppears , When (A) isheatyed with an aqueous NaOH solution , an alkaline gas (C ) is evolved ,When gas(B) is leasted with sodumine ,a colourless solid (D) is formed .When (D) is heated with dil H_(2)SO_(4) a colourless liquid (F) is formed . The compound C has |
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Answer» Linear geometry i.`underset((A))(NH_(4)NO_(3) underset((B))(N_(2) O) + 2H_(2)O` ii `NH_(4)NO_(3) + NaOH overset(Heat)rarr underset((C))(NH_(3)UARR) +NaNO_(3)+H_(2)O` iii. `underset((B))(N_(2)O)+NaNH_(2) rarr underset("Sodium azide"(D))(NaN_(3))+H_(2)O` `NaN_(3) +H_(2)SO_(4) + underset((E)"hydrazoic acid")(HN_(3))+NaHSO_(4)` `Pb(N_(3))_(2), AgN_(3)` (AZIDES) are expolsive. |
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| 89231. |
(A) H_(3)PO_(3) is tribasic acid (R )Three H atoms are directly attached to P atom in a H_(3)PO_(3) molecule. |
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Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT explanation of (A) |
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| 89232. |
(A)is a colourless solid, itmetal when heated and gives of a gas (B) Which is supporter of combustion , if heating is contimed the white of the solid disuppears , When (A) isheatyed with an aqueous NaOH solution , an alkaline gas (C ) is evolved ,When gas(B) is leasted with sodumine ,a colourless solid (D) is formed .When (D) is heated with dil H_(2)SO_(4) a colourless liquid (F) is formed . The mass ofcompound E is |
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Answer» Ammonia i.`UNDERSET((A))(NH_(4)NO_(3) underset((B))(N_(2) O) + 2H_(2)O` ii `NH_(4)NO_(3) + NaOH overset(Heat)RARR underset((C))(NH_(3)uarr) +NaNO_(3)+H_(2)O` iii. `underset((B))(N_(2)O)+NaNH_(2) rarr underset("Sodium azide"(D))(NaN_(3))+H_(2)O` `NaN_(3) +H_(2)SO_(4) + underset((E)"hydrazoic acid")(HN_(3))+NaHSO_(4)` `Pb(N_(3))_(2), AgN_(3)` (azides) are expolsive. |
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| 89233. |
(A) H_(3)PO_(3) is dibasic acid and H_(3)PO_(4) is tribasic (R ) H_(3)PO_(3) has two replaceable H - atoms and H_(3)PO_(4) has three replaceable H - atoms |
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Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT EXPLANATION of (A) |
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| 89234. |
(A)is a colourless solid, itmetal when heated and gives of a gas (B) Which is supporter of combustion , if heating is contimed the white of the solid disuppears , When (A) isheatyed with an aqueous NaOH solution , an alkaline gas (C ) is evolved ,When gas(B) is leasted with sodumine ,a colourless solid (D) is formed .When (D) is heated with dil H_(2)SO_(4) a colourless liquid (F) is formed Thecompound E has |
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Answer» Linear structure i.`underset((A))(NH_(4)NO_(3) underset((B))(N_(2) O) + 2H_(2)O` ii `NH_(4)NO_(3) + NaOH OVERSET(Heat)rarr underset((C))(NH_(3)uarr) +NaNO_(3)+H_(2)O` iii. `underset((B))(N_(2)O)+NaNH_(2) rarr underset("Sodium AZIDE"(D))(NaN_(3))+H_(2)O` `NaN_(3) +H_(2)SO_(4) + underset((E)"hydrazoic acid")(HN_(3))+NaHSO_(4)` `Pb(N_(3))_(2), AgN_(3)` (azides) are expolsive. |
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| 89235. |
A is a binary compound of a univalent metal. 1.422 g of A reacts completely with0.321 g of sulphur in an evacuated and sealed tube to give 1.743 g of a white crystalline solid B, that forms a hydrated salt C, with Al_2(SO_4)_3 . Identify A, B and C. |
| Answer» SOLUTION :`KO_2 , K_2SO_4, K_2SO_4, . Al_2(SO_4)_3 . 24H_2O` | |
| 89236. |
(A) H_(2) SO _(4) is used in the preparation of HCl from NaCl (R ) H _(2) SO _(4) is lower volatile cid than HCl |
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Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT explanation of (A) |
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| 89237. |
(A) : H_(2)SO_(4) is called king of chemicals (R ) : H_(2)SO_(4) has wide range of applications in industries. |
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Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT explanation of (A) |
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| 89238. |
A is a binary compound of a univalent metal. 1.422 g of A reacts completely with 0.321 g of sulphur in an evacuated and sealed tube to give 1.743 g of a white crystalline solid B, that forms a bydrated double salt, C with Al_(2) (SO_(4))_(3). Identify A, B and C. |
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Answer» Solution :Compound B FORMS hydrated CRYSTALS with `Al_(2)(SO_(4))_(3)`. Also, B is formed with univalent metal on heating with sulphur. Hence, compound B MUST has the molecular formula `M_(2)SO_(4)` and compound A must be an oxide of M which reacts with sulphur to give metal sulphate as `A+S rarr M_(2)SO_(4)` `:' 0.321 g` sulphur gives `1.743 g` of `M_(2)SO_(4)` `:. 32.1 g S` (one MOLE) will give `174.3 g M_(2)SO_(4)` Therefore, molar mass of `M_(2)SO_(4)=174.3 g` `implies 174.3=2xx` Atomic weight of `M+32.1+64` `implies` Atomic weight of `M=39`, metal is potassium `(K)` `K_(2)SO_(4)` on treatement with aqueous `Al_(2)(SO_(4))_(3)` gives potash-alum. `underset(B)(K_(2)SO_(4))+Al_(2)(SO_(4))_(3)+24H_(2)O rarr K_(2)SO_(4)Al_(2)underset(C)((SO_(4))_(3)).24H_(2)O` If the metal oxide A has molecular formula `MO_(x)` two moles of it combine with one mole of sulphur to give one mole of metal sulphate as `2KO_(x)+S rarr K_(2)SO_(4)` `implies x=2`, i.e. `A` is `KO_(2)`. |
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| 89239. |
(A) H_(2) Ois a liquid while H _(2) Sis gas at room temperature (R ) Both H_(2)O and H_(2)S are exothermic compounds |
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Answer» Both (A) and (R ) are true and (R ) is the CORRECT EXPLANATION of (A) |
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| 89241. |
(A) H_(2) is good reducing agentbut not widely used in metallurgical process (R) Metalhydrides can be formed and mixtureof H_(2) andO_(2)may explode |
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Answer» Both (A) and (R) are TRUE and (R) is the correct EXPLANATION of (A) |
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| 89242. |
(A) Guanine unites with Cytosine but not with Thymine. (R) Guanine and Cytosine are purine bases while Thymine is a pyrimidine base. |
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Answer» Both A & R are true, R is the CORRECT explanation of A |
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| 89244. |
(A): H,0 is thermally more stable than H_(2)S (R): H_(2)O molecules can form inter-molecular hydrogen bonds where as H_(2)S molecules can not. |
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Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT EXPLANATION of (A) |
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| 89246. |
A group which deactivates the benzene ring towards electrophilic substitution but which directs the incoming group principally to the o- and p-positions is |
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Answer» `-NH_(2)` |
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| 89247. |
A group two element M forms a carbide which is actually a methanide (i.e., it gives off methane of hydrolysis). Then, which of the following statements is/are correct for the element? |
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Answer» The aqua complex of `M^(2+)` acidic. `Be_(2)C+H_(2)OtoBe(OH)_(2)+CH_(4)` Aqua complex of `Be^(2+)` is acidic due to hydrolysis. Be (like BA) is toxic,its hydroxide is amphoteric, but it forms only tetrahydroxido complex. Dolomite is `CaCO_(3).MgCO_(3)` |
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| 89250. |
(A) is |
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Answer»
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