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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.
| 20501. |
When conc . Aqueous solution of potassium acetate is electrolysed we get |
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Answer» METHANE |
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| 20502. |
Which of the following cannot be used for converting aldehydes and ketones to alcohols? |
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Answer» Finely divided nickel |
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| 20503. |
Which galvanic cell can be obtained by following redox reaction ? (1)/(2)H_(2(g))+AgCl_((S)) hArr_((aq))^(+)+Cl_((aq))^(-)+Ag_((S)) |
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Answer» `Pt|H_(2(g))|KCl||AgCl_((S))|AG` |
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| 20504. |
Which of the following does not react with Fehling's solution |
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Answer» BENZALDEHYDE |
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| 20505. |
When the message between two neurons or that between neurons to muscles is complicated through certain chemicals. What are called such messengers ? |
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Answer» CHEMICAL MESSENGERS |
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| 20506. |
Using IUPAC norms write the formulae for the following : Tetraamminechloridonitrito-N-platinum(IV)sulphate |
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Answer» Solution :`[PT(NH_(3))_(4)CL(NO_(2))]SO_(4)` Tetraamminechloridonitrito-N-platinum(IV)sulphate |
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| 20508. |
When 0.5 amp of current was passed for 200 seconds, 0.34 gm of copper was deposited , the electrochemical equivalent of copper will be |
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Answer» 34 |
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| 20509. |
Which one of the furnaces among the following can produce the highest temperature? |
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Answer» MUFFLE FURNACE |
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| 20510. |
Which of the following IUPAC names(s) is/are not correctly matched with its formula? |
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Answer» Dichloridobis(ethane-1,2-diamine)cobalt(III) ion: `[CoCl_(2)(en)_(2)]^(+)` |
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| 20511. |
Which of the folloiwng has highest thermal stability? |
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Answer» `HClO_(3)` |
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| 20512. |
Which of the following contains both Ca and Mg ? |
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Answer» GYPSUM |
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| 20513. |
When a strong acid, strong base or their salt are dissolved in water, they are completely ionized. If a strong acid is added to a strong base. H^(+) ions from the former combine with OH^(-) ions of the latter forming water. The formation of each water molecule liberates a certain quantity of energy and the reaction is exothermic. The heat liberated when one mole of water is formed by combining hydrochloric acid and sodium hydroxide is 13.7 kcal. The heat liberated when one mole of water is formed by combining sulphuric acid and sodium hydroxide is |
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Answer» 25.5 kcal |
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| 20515. |
What is Z in the following reaction? "Ethanol" overset(PBr_(3))to Xoverset("Alcoholic" KOH)to Y underset((ii)H_(2)O)overset((i)H_(2)SO_(4))to Z |
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Answer» `CH_(3)CH_(2)OCH_(2)CH_(3)`<BR>`CH_(3)CH_(2)O-SO_(3)H` |
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| 20516. |
When a chromite ore (A) is fused with sodium carbonate in free excess of air and the product is dissolved in water, a yellow solution of compound (B) is obtained. After treatment of this yellow solution with sulphuric acid, Compound (C ) can be crystallised from the solution. When compound (C ) is treated with KCl, orange crystals of compound (D) crystallise out. Identify A to D and also explain the reactions. |
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Answer» Solution :`A: FeCr_(2)O_(4), B: Na_(2)CrO_(4)` `C: Na_(2) Cr_(2)O_(7), D: K_(2)Cr_(2)O_(7)` `underset((A))(4FeCr_(2)O_(4)) + 8Na_(2)CO_(3) + 7O_(2) rarr underset((B))(8Na_(2)CrO_(4))` `underset((B))(2Na_(2)CrO_(4)) + 2H^(+) rarr Na_(2)Cr_(2)O_(7) + H_(2)O + 2NA^(+)` `underset((C ))(Na_(2)Cr_(2)O_(7)) + 2KCl rarr underset((D))(K_(2)Cr_(2)O_(7)) + 2NaCl` |
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| 20517. |
The time required to coat a metal surface of 80 cm^2 with 5xx10^(-3) cm thick layer of silver (density 10.5 g cm^(-3) with th passageof 3A current through a silver nitrate solution is : |
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Answer» 115 sec |
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| 20518. |
The solubility product of a binary weak electrolyte is 4 xx 10^(-10) " at"298K. It's solubility in mol dm^(-3) at the same temperature is |
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Answer» `8 xx 10^(-10)` `S= sqrt(K_(SP)) = sqrt(4 xx 10^(-10)) = 2.10^(-5) mol dm^(-3)` |
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| 20519. |
Which of the following statements is trueA) Ma_3b_3 type of complex exhibits fac-mer isomerismB) Tetrahedral complexes do not exhibit optical isomerism C)[Co(en)_3]^(3+) shows optical isomerismD) [Pt(en)_2Cl_2] does not exhibit optical isomerism |
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Answer» A,B,C are CORRECT |
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| 20520. |
Which of the following compound is formed when ethanol reacts with acetic acid in the presence of concentrated H_2 SO_4 . |
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Answer» `CH_3 COOC_2H_5` |
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| 20521. |
Which metal is refined by Mond process? |
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Answer» Titanium |
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| 20522. |
Which one of the following will have the maximum dipole moment |
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Answer» `CH_(3)F`<BR>`CH_(3)Cl` |
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| 20523. |
Which of the following reactions is not a disproportionation reactio ? |
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Answer» `2NO_(2)+H_(2)O=HNO_(3)+HNO_(2)` |
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| 20524. |
What is meant by corrosion ? |
| Answer» SOLUTION :This REDOX process which CAUSES the DETERIORATION of metal is called corrosion. | |
| 20525. |
What are amino acids ? Why are they so important ? |
Answer» Solution :Amino acids. These are organic compounds containing both an amino group and carboxylic group in their molecules . These are represented by the general formula:  The amino `(-NH_2)` group may be attached to any carbon atom other than that of carboxylic (-COOH) group. Accordingly, they are classified as `alpha-, beta-gamma-` etc. amino acid depending upon the position of amino group with respect to the carboxyl group. The carbon atom adjacent to the carboxyl group is designated as a carbon while the successive carbon atoms ALONG the carbon chain are `beta, gamma`-carbon atoms. Amino acids are referred to as `alpha, beta, gamma` depending upon whether the amino group is present on `alpha, beta, gamma` carbon atom RELATIVE to carboxyl group. Nearly all the NATURALLY occurring amino acids are `alpha`-amino acids i.e. containing amino group on the carbon atoms a to the carboxylic group. The general structure of `alpha`-amino acid is shown above. These amino acids are very important because these are the building blocks of proteins, which are very essential for us. The HUMAN body can synthesise 10 out of 20 amino acids found in proteins. Therefore, other must be supplied in our diet and these are called essential amino acids. Lack of essential amino acids in diet can cause diseases such as kwashiorkor. |
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| 20526. |
When CuSO_(4) reacts with KI, the oxidation number of Cu changes by |
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Answer» Solution :`overset(+2)(Cu)SO_(4)+2 KI hArr K_(2)SO_(4)+CuI_(2)` `2 CuI_(2) rarr overset(+1)(Cu)_(2)I_(2)+I_(2)` |
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| 20527. |
Vappour pressure of water decreases from one atmosphere to one bar by dissolving glucose. (1 atm =1.01 bar) . Which statement (s) is (are) correct ? (P_("bar")=1 "atm") |
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Answer» The solution contains approximately `1%` of glucose by moles |
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| 20528. |
Which of the following contains P-O-P bond |
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Answer» Hypophosphorus ACID 
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| 20529. |
Which group elements of first transition series has the highest paramagnetism in elemental form of +1 O.S, +2 O.S. and +3 O.S.(O.S.= Oxidation state) respectively ? |
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Answer» Group 6, Group 7, Group 7, Group 8 |
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| 20530. |
Which of the following elements does not show allotropy? |
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Answer» NITROGEN |
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| 20531. |
Write the structure of monomers used for getting the following polymers: Glyptal |
Answer» SOLUTION :
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| 20532. |
Which of the following is most basic ? |
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Answer» BENZYLAMINE |
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| 20533. |
The structural feature that distinguishes proline from other amino acids are |
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Answer» It is a secondary amine 
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| 20534. |
There are some arrangements of atomic orbitals which are given below: Then calculate the value of "QtimesR-P'" where P, Q and R are no. of arrangements which give bonding molecular orbitals (positive overlap), antibonding molecular orbitals (negative overlap) and non-bonding molecular orbitals (zero overlap) respectively. |
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Answer» (Q)=(ii), (V), (ix), (3) (R)=(ii), (vii), (2) then `QtimesR=3times2-4implies2` |
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| 20535. |
Whichone of the followingis notmonosaccharide ? |
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Answer» FRUCTOSE |
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| 20536. |
When phenol reacts with which one of the following reagents, a conjugate diketone will be formed ? |
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Answer» `Na_2Cr_2O_7` |
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| 20537. |
Which gives blue colour to glass ? |
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Answer» NiO |
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| 20538. |
Which is the correct IUPAC name for CH_(3)-underset(C_(2)H_(5))underset("|")("C")H-CH_(2)-Br ? |
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Answer» 1-Bromo-2-ethylpropane |
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| 20540. |
What product is obtained when propionamide is heated with Br_(2) in alkali |
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Answer» `CH_(3)CH_(2)COONa` |
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| 20541. |
Write the structure of the products in each case: (i) CH_(3)CH_(2)NH_(2) overset ((CH_(3)CO)_(2))(Delta) (ii)CH_(3)CONHC_(6)H_(5) overset(Br_(2)//Fe) to (iii) CH_(3)CH_(2)CN overset(H_(2)O/H)to |
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Answer» SOLUTION :(i) `CH_(3)CH_(2)NHCOCH_(3), CH_(3)COOH` (II)  (III) `CH_(3)CH_(2)COOH + NH_(4)^(+)` |
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| 20542. |
Which of the following ion has highest ionic radius |
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Answer» `Sc^(+3)` |
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| 20543. |
Which is not correct for N_2O ? |
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Answer» It is CALLED laughing gas |
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| 20544. |
Which of the following compounds give alcohol on reaction with NaNO_(2) and HCI |
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Answer» `C_(6)H_(5)CH_(2)NH_(2)` |
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| 20545. |
Which of the following could act as a propellant for rocket |
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Answer» Liquid HYDROGEN + Liquid nitrogen |
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| 20546. |
Which statement is wrong? |
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Answer» Haber's PROCESS of `NH_3` requires iron as catalyst. |
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| 20547. |
What is meant by matrix? |
| Answer» Solution :The IMPURITIES like SAND, mud and stone PRESENT in the ore are CALLED matrix or GANGUE. | |
| 20548. |
The total number of isomers for the compound of the formula C_(4)H_(10)O is : |
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Answer» SEVEN |
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| 20549. |
When acetylene reacts with arsenic trichloride in the presence of anhydous aluminium chloride, it produces |
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Answer» LEWISITE |
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| 20550. |
Which of the following has highest Ka value ? |
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Answer»
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