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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.
| 2801. |
Which of the following is not a fatty acid |
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Answer» Propionic ACID |
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| 2802. |
When 1.0 xx 10^(-5) mg of a protective colloid is added to 20 ml of standard gold sol, the precipitation of gold sol was prevented by adding 5 ml of 10% solution of NaCl. If the gold number of protective colloid is 2.0 x 10^(-x) mg then x is = __? |
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Answer» `(10^(-5) xx 10)/(20) = 0.5 xx 10^(-5) , 5 ml to 0.5 xx 10^(-5) , 1 rarr ? , 0.1 xx 10^(-5) = 1 xx 10^(-6)`. |
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| 2803. |
Write the overall reaction in nickel-cadmium cell during discharge. |
| Answer» Solution :`CD(s) + 2Ni(OH)_(3)(g) to CdO (s) + H_(2)O(l)` | |
| 2804. |
Whichof the following is the energy of a possible excited state of hydrogen? |
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Answer» `+13.6eV` `E=-(13.6Z^(2))/(n^(2))eV` Z=1, FIRST excited state n=2 `:.E=-3.6/(2^(2))=-3.4eV` |
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| 2805. |
Which reagent mixture is used in Lucas test? |
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Answer» Anhydrous `AICI_(3)` |
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| 2806. |
Which of the following diagrams us correctly related to different steps involved in the extraction of Zn from zinc blende ore? |
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Answer»
• Rasting `rarr` Concentated ore is then roasted at `900^(@)-1000^(@)C` to convert `ZnS` and `ZnSO_(4)`to `ZNO`. • Readuction of ckoe `rarr` The oxide `ZnO` is reduced with coke at about `1500^(@)C` to obtain metallic zinc. • Electrolytic refining `rarr` Pure zinc is obtained by electrolysis zinc in presence of ACIDIFIED `ZnSO_(4)` as ELECTROLYTE. |
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| 2807. |
Which one is bronstad acid but not a bronstad base? |
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Answer» `H_2O` |
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| 2809. |
Write partial structure of the following polymer.Teflon |
| Answer» SOLUTION :`[--CF_2 - CF_2--]_n` | |
| 2810. |
Which of the following is placed above the pure mercury in calomel electrode ? |
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Answer» Hg+KCl |
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| 2811. |
Which reaction producese SO_(2) |
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Answer» `2Na_(2)S_(5)+3O_(2)overset(DELTA)underset(air)rarr` |
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| 2813. |
Which of the following undergoes hydrolysis when dissolved in water |
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Answer» `CH_(3)COONa` |
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| 2814. |
Which one of the following is found in alkenes ? |
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Answer» CHAIN isomerism |
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| 2815. |
When nitrobezene is treated with Br_2 in the presence ofFeBr_2 the major product formed is m-bromonitro-benzene . Statements which are related to obtatining the m-isomer are : |
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Answer» The electron densitty on meta-carbon is more than that on ortho-and para -positons |
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| 2816. |
The standard reduction potential values of three metallic cations, X,Y, and Z are 0.52,-3.03, and -0.18V, respectively. The order of reducing power of the corresponding metal is |
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Answer» `YgtZgtX` |
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| 2817. |
Which will reduce acidified potassium dichromate solution? |
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Answer» POTASH alum |
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| 2818. |
Which of the following reagents is used to convert - COOH group to CH_(3) group ? |
| Answer» Answer :A | |
| 2819. |
What products are obtained in the electrolysis of fused KCl and aqueous solution of KCl between platinu electrodes ? |
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Answer» |
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| 2820. |
Which of the following is/are a surfactant? |
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Answer» DETERGENTS |
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| 2821. |
Which of the following is incorrect about NaCl structure ? |
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Answer» NEAREST neighbours of `Na^(+)` ion is SIX `Cl^(–)` ion |
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| 2822. |
Write the chemical equations for one example of each of the following : (a) Coupling reaction""(b) Hoffmann's bromamide reaction (c) Acetylation. |
Answer» Solution :(a) Coupling reaction :  (B) Hoffmann.s bromamide reaction : `underset("ETHANAMIDE")(CH_(3)-overset(overset(O)(||))(C)-NH_(2))+Br_(2)+4KOH rarr underset("Methanamine")(CH_(3)NH_(2))+K_(2)CO_(3)+2KBr+2H_(2)O` (c) Acetylation : When ANILINE reacts with acetyl chloride in the presence of NaOH, we get acetanilide. This process is called acetylation. 
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| 2823. |
When a primary amine reacts with chloroform and ethanolic KOH, then the product formed is |
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Answer» isocyanide |
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| 2824. |
Which of the following is not an ore of aluminium ? |
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Answer» Anglesite |
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| 2825. |
Which statement (s) is (are) correct? |
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Answer» Electrons in motion behave as if they are waves |
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| 2826. |
Which halogen shows only one oxidation state ? |
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Answer» F |
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| 2827. |
When H_(2)S gas is passed into a certain solution, it reacts to form a white precipitate. The solution referred to contains ions of |
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Answer» Lead |
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| 2829. |
What is the effect on AH and AS during the process of adsorption? |
| Answer» SOLUTION :Both `DELTAH and DELTAS ` DECREASES (DeltaH `= -ve and `DeltaS = -ve`) | |
| 2830. |
Which of the following are correct methods for the preparation of propanoic acid ? |
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Answer» `H_(3)C-CH=CH_(2)OVERSET(HBr)rarroverset(Mg)underset(Ether)rarroverset(CO_(2))underset(H_(3)^(OPLUS)O)rarr` |
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| 2831. |
What are the colours of the following sulphides ? (i) CoS (ii) CuS (iii) MnS (iv) CdS. |
| Answer» Solution :(i) Black (ii) Black (III) FLESH coloured (IV) Yellow | |
| 2833. |
Which one of the following is an example for water in oil emulsion? |
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Answer» Milk |
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| 2834. |
When electrons are trapped into the crystal in anion vacancy, the defect is known as |
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Answer» Schottky defect 
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| 2835. |
To prepare tert -butyl ethyl ether by Williamson synthesis, the reactants needed are |
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Answer» Sodium ethoxide and sodium TERT butoxide |
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| 2836. |
Which one of the following reacts with concentrated sulphuric acid |
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Answer» Au `Pb+2H_(2)SO_(3)rarrPbSO_(4)+SO_(2)+2H_(2)O` |
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| 2837. |
The structure of BF_3 is : |
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Answer» Tetrahedral |
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| 2838. |
Why adenine always pairs with thymine and guanine with cytosine ? |
| Answer» Solution :Adenine can FORM two hydrogen BOND with THYMINE and Guanine FORMS three hydrogen bonds with cytosine. | |
| 2839. |
What is vulcanization of rubber ? |
| Answer» Solution :During vulcanization, natural ID heated with `3-5%` sulphur . The FUNCTION of sulphur is to introduce sulphur (or disulphide) bridges or cross-links between polymer chainsthereby IMPARTING more tensile strength, elasticity and resistance to abrasion. | |
| 2840. |
Two reactions proceed at 25^(@)C at the same rate . The temperature coefficient of the rate of first reaction is 2 and the that of second reaction is 2.5 . The ratio of rates of these reactions at 95^(@) C is : |
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Answer» 5.6  `:. (R_(2))/(R_(1))= ((2.5)^(7))/(2^(7))= 4.768` |
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| 2841. |
Which of the following possesses highest melting point? |
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Answer» Chlorobenzene |
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| 2842. |
Which of the following is true about the complex [PtCl_(2)(NH_(3))OH_(2)] ? [Atomic number of Pt=78] (P) It will have two geometrical isomeric forms, cis and trans (Q) The hybridisation state of Pt(II) is sp^(2) (R ) It is a square planar complex (S) It is a diamagnetic complex (T) It can show hydrate isomerism (U) It is tetrahedral complex |
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Answer» <P>P, R, S  Diamagnetic , `dsp^(2)`
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| 2843. |
Whichof the followingis correct? |
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Answer»
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| 2844. |
Which of the following is not a target molecule for drug function in body ?Carbohydrates,Lipids,Vitamins,Proteins. |
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Answer» Carbohydrates |
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| 2845. |
Thermal decomposition of a compound is of first order. If 50% of a sample of the compound is decomposed in 120 minutes how long will it take for 90% of the compound to decompose? |
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Answer» `399` min `K = (0.693)/(T_(1//2)) = (0.693)/(120) = 5.77 XX 10^(3) min-1` Now we know that for a first order reaction `K = (2.303)/(t) "log"((a)/(a-x))` Here the initial CONCENTRATIION `a = 100` and `N = 90` `:. 5.77 xx 10^(-3) = (2.303)/(t) "log"(100)/(100-90)` `t = (2.303)/(5.77 xx 10^(-3))"log"((a)/(a-x))` Solving,`t = 399` minute |
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| 2846. |
The two compounds used as refrigerants are 1. NH_(3) 2. C Cl_(4) 3. CF_(2) 4. CF_(2) Cl_2 |
| Answer» Solution :1 and 4 Both can be LIQUEFIED EASILY. | |
| 2847. |
What are the applications of the Ellingham diagram ? |
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Answer» Solution :(i) Ellingham diagram helps us to select a suitable reducing agent and appropriate TEMPERATURE range for reduction. (II) From the Ellingham diagram, we can infer the relative stability of different metal oxides at a GIVEN temperature. (iii) Ellingham diagram is USED to predict thermodynamic feasibility of reduction of oxides of one metal by another metal. |
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| 2848. |
Write the product of following reactions : (i) CH_(3)-C-=C-CH=CH_(2) overset(O_(3)//H_(2)O_(2))rarr, (ii) ,overset(O_(3)//H_(2)O_(2))rarr |
Answer» 
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| 2849. |
Which of the following statements are correct ? (i) When an animal hide, which has negatively charged particles , is soaked in tannin, which contains positively charged colloidal particles, mutual coagulation does not take place. (ii) Photographic films are prepared by coating an emulsion of the light sensitive silver bromide in gelatin over glass plates or celluloid films. (iii) Latex is a colloidal solution of rubber particles which are negatively charged. (iv) In Cottrell precipitator , the smoke , before it comes out from the chimney, is led through a chamber containing plates having a charge opposite to that carried by smoke particles. The particles on coming in contact with these plates acquire some charge and do not get precipitated . |
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Answer» (i) and (IV) only |
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| 2850. |
Which one of the following statements is not true regarding cellulose ? |
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Answer» It is a colourless amorphous SOLID |
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