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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.
| 3901. |
What are the characteristics of the following colloids ? Give one example of each. (i) Multimolecular colloids (ii) Lyophobic sols (iii) Emulsions. |
| Answer» Solution :(i) Multimolecular colloids : When a large number of atoms or smaller molecules of a substance aggregate together to form species having size in colloidal range, we obtain multimolecular colloids. For example, gold sol and SULPHUR sol may contain respective particles of various sizes. (ii) Lyophobic sols : Sols in which the colloidal particles do not have affinity for the solvent are called lyophobic sols. Colloidal solutions of such substances cannot be prepared just by mixing the DISPERSED phase and dispersion MEDIUM. Sols of metals and their sulphides are examples of this class of sols. (iii) Emulsions : These are liquid-liquid colloidal systems. If a mixture of two IMMISCIBLE or partially miscible liquids is shaken, a coarse dispersion of one liquid in the other is obtained which is called emulsion. We have oil in water emulsions like MILK and vanishing cream and water in oil emulsions like butter and cream. | |
| 3902. |
Which of the following can generally occur at low temperature ? |
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Answer» PHYSICAL ADSORPTION |
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| 3903. |
When phenol is treated with CHCL_3 " and " NaOH , the electrophile involved and product formed respectively are |
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Answer» DICHLOROCARBENE, salicylic ACID 
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| 3905. |
whichhas the lowest melting point ? |
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Answer» Cs |
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| 3906. |
When adenine is attached to ribose sugar, it is called adenosine . To make a nucleotide from it, would require |
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Answer» oxygenation |
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| 3907. |
The slope in Arrhenius plot, is equal to, |
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Answer» `-(E_(a))/(2.303R)` `K=Ae^(-E_(a))/(2.303RT)` taking "LOG" on both sides, we GET `"log"k="log"A-(E_(a))/(2.303RT)` Arrhenius plota GRAPH `"log"k and (1)/(T)` whose slope is `(E_(a))/(2.303RT)`. |
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| 3908. |
Write the following for a white phosphorus molecule: (a) oxidation state of P, (b) valency of P, (c) total number of bonds and (d) bond order. |
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Answer» <P> SOLUTION :Oxidation state of phosphorus in `P_(4)` molecule is ZERO.Valency of P in `P_(4)` molecule is three. Each Patoin forms 3 BOND pairs and possesses one lone pair. Total number of `P-P` sigma bonds in a molecule of phosphorus is six. Phosphorus-phosphorus bond ORDER in `P_(4)` molecule is one. |
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| 3909. |
Which of the following ions is most para magnetic |
| Answer» Answer :A | |
| 3910. |
Which of the following statements is not correct for nitrogen ? |
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Answer» Its electronegativity is very high |
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| 3911. |
Which statement is incorrect about osmotic pressure (p), volume (V) and temperature (T)? |
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Answer» <P>`p PROP 1//V` if T is CONSTANT |
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| 3912. |
Which of the following reactions does not takes place to give the product |
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Answer»
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| 3913. |
Which of the following orders is correct? |
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Answer» (i) GT (II) gt (III) gt (IV) |
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| 3914. |
Which of the following is a coordination compound ? |
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Answer» Alum |
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| 3915. |
When we heat borax strongly then it will yield the following compound |
| Answer» Answer :D | |
| 3916. |
Which of the following statements is true in case of alkyl halides ? |
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Answer» They are POLAR in nature |
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| 3917. |
Which of the following is required of the central metal in [Cr(NH_3)_4(NO_2)Cl]^(+) ? (Atomic No. of Cr =24) |
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Answer» |
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| 3919. |
Using the valence bond theory predict the geometry and magnetic behaviour of [CoF_(6)]^(3-). [At. no. of Co = 27] |
Answer» Solution :Configuration of `Co^(3+)`  Geometry : The pairing will not take place because F is a WEAK ligand `sp^(3)d^(2)` will give rise to OCTAHEDRAL shape. MAGNETIC behaviour : Due to the presence of 4 UNPAIRED electrons, the complex will be highly paramagnetic |
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| 3920. |
What is called aquaregia solution ? |
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Answer» Mixture of 50 % CON. HCl + 50 % con. `HNO_3` |
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| 3921. |
Which of following statement is incorrect :- |
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Answer» Boiling POINT of `H_(2)O_(2)` is greater than that of `H_(2)O`. (ii)Number of hydrogen bond in ethylene glycol is lesser than glycerol. (iii) o-nitrophenol has low boiling point than para nitrophenol. (iv) In ice each oxygen atom bonded with four hydrogen atom, two hydrogen covelently bonded and another two hydrogen bonded with H-bond. |
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| 3922. |
Write the chemical equations for all the steps involved in the rusting of iron. Give any one method to prevent rusting of iron. |
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Answer» Solution :At a particular spot of the iron object, oxidation takes place. That spot ACTS as anode. The reaction at anode can be written as: `2Fe (s) to 2Fe^(2+) (aq) + 4e^(-)`.........(i) Electrons released at anode move through the metal to another spot and reduce oxygen in the presence of `H^+`. This spot acts as CATHODE. The reaction at cathode can be represented as: `O_2 (8) + 4H^(+) (aq) + 4^(e-) to 2H_2O(L)`......... (ii) The overall reaction by combining (i) and (ii) `2Fe (s) + O_2 (g) + 4H^(+ )(aq) to 2Fe^(2+) (aq) + 2H_2O` (l) The ferrous ions are further oxidised to ferric ions which combine with water to form `Fe_(2)O_(3).xH_(2)O` which is the formula of rust. Prevention of rusting : Iron can be prevented from rusting by galvanisation which involves coating iron with zinc. Zinc being more reactive than iron gets oxidised first and thus prevents iron from rusting. |
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| 3923. |
Write the Nernst equation and calcualte emf of the following cell at 298 K: Mg(s) | Mg^(2+) (0.1 M ) || Cu^(2+) (0.01 M) | Cu(s) Given: E_("cell")^(@) = 2.71 V |
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Answer» Solution :Nernst equation for the CELL may be written as: `E_("cell") =E_("cell")^(@) -(0.0591)/N log ([MG^(2+)])/([Cu^(2+)])M` Substituting the VALUES in the above equation, we have `I_("cell")^(-) =2.71 V - (0.0591)/2 log ([0.1])/([0.01]) = 2.71 V - 0.00295 xx 1 = 2.68 V` |
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| 3924. |
Which of the following is not synthetic rubber ? |
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Answer» POLY 1,3 -butadine acrylonitrile |
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| 3925. |
When an oxide of manganese (A) is fused with KOH in the presence of an oxidising agent and dissolved in water, it gives a dark green solution of compound (B). Compound (B) disproportionates in neutral or acidic solution to give purple compound (C). An alkaline solution of compound (C) oxidises potassium iodide solution to a compound (D) and compound (A) is also formed. Identify compounds (A) to (D) and also explain the reactions involved. |
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Answer» SOLUTION :The compounds (A), (B), (C) and (D) are given as under : (A) `MnO_(2)`(B) `K_(2)MnO_(4)`( C ) `KMnO_(4)`(D) `KIO_(3)` The reactions are EXPLAINED as under : `underset((A))(2MnO_(2))+4KOH+O_(2)to underset((B))(2K_(2)MnO_(4))+2H_(2)O` `3MnO_(4)^(2-)+4H^(+)to underset((C))(2MnO_(4)^(-))+MnO_(2)+2H_(2)O` `2MnO_(4)^(-)+H_(2)O+KI to underset((A))(2MnO_(2))+2OH^(-)+underset((D))(KIO_(3))` |
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| 3926. |
What is auto catalysis? Give two examples. |
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Answer» Solution :The process in which ONE of the product formed act as a catalyst is TERMED auto catalysis. `UNDERSET("Ethyl ACETATE ")(CH_3COOC_2H_5)+H_2O overset(H_2SO_4) underset("Acetic acid ")(CH_3COOH) + underset("Ethanol")(C_2H_5OH)` Acetic acid acts as auto catalyst. DECOMPOSITION of Arsenic hydride `underset("Arsenic hydride")(2AsH_3) to underset(2As+3H_2)` Arsenic act as auto catalyst. |
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| 3928. |
What is the mass of one CO_(2) molecules in gm? |
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Answer» `((44)/(N_(A))GM)` |
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| 3929. |
Which of the following is a buffer ? |
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Answer» HCl and NACL |
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| 3930. |
Two chemical reactions are given below: (1) Identify the products of each reaction. |
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Answer» |
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| 3931. |
The true statement for the acids of phosphorus. H_(3)PO_(2), H_(3)PO_(3) and H_(3)PO_(4) is : |
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Answer» the ORDER of their ACIDITY is `H_(3)PO_(4) lt H_(3)PO_(3) lt H_(3)PO_(2)`  (II) The acidity increases with increase in oxidation number of central atom `H_(3)overset(+1)(PO_(2)) lt H_(3)overset(+3)(PO_(3)) lt H_(3)overset(+5)(PO_(4))` (iii) `H_(3)PO_(4)` is not reducing. (iv) `H_(3)PO_(3)` is diabasic, while `H_(3)PO_(2)` is MONOBASIC. |
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| 3933. |
Which is least stable in aqueous medium ? |
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Answer» `Mn^(2+)` |
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| 3934. |
Whatwill be theleastmolecularmassof analkanewhichis optically active ? |
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Answer» 70 |
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| 3935. |
Which requires catalyst ? |
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Answer» `S+O_2rarrSO_2` |
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| 3936. |
Which compound is prepared by the following reaction:Xe(g) + 2F_2(g)overset(873K)underset(7 atm) rarr |
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Answer» `XeF_2` |
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| 3937. |
Which of the of following shows aromatic properties |
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Answer» valine |
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| 3938. |
Which of the following has most acidic hydrogen : |
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Answer» 3-hexanone |
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| 3939. |
Which of the following is stable compound: |
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Answer» ` Cl_3C CH(OH)_2` |
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| 3940. |
Which of the following would be least reactive towards bromide |
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Answer» <P>Nitrobenzene 
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| 3941. |
Which of the followingstatement is correct ? |
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Answer» `E_(cell)` and `Delta_(r)G` of cell reaction both are extensive PROPERTIES. |
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| 3942. |
The synthesis of mRNA fromDNA strandis called. |
| Answer» SOLUTION :TRANSCRIPTION | |
| 3943. |
Which of the followingstatementsis not true ? |
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Answer» on passing` H_(2)S` through acidified , ` K_(2)Cr_(2)O_(7)`solution , a milky colour is observed. |
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| 3944. |
Which of the following vitamins is water soluble? |
| Answer» Answer :A::B | |
| 3945. |
Which substance shows paramagnetism when heated ? |
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Answer» `NACL` |
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| 3946. |
Which halogen present in hexachlorobenzene and benzene hexachloride is inert in nature? |
| Answer» SOLUTION :HEXACHLOROBENZENE as it is an ARYL HALIDE | |
| 3947. |
Washing soda has the formula |
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Answer» `Na_2CO_3.7H_2O` |
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| 3948. |
The relationship between equivalent conductivity (lambda), specific conductivity (K) and normality (xN) of a solution is |
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Answer» `K=(1000xx X)/(lambda)` |
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| 3949. |
What makes graphite a soft solid ? |
| Answer» SOLUTION :Different layers of graphite can SLIDE past one another. That makes graphite a SOFT solid. | |
| 3950. |
Which of the following complexes is diamagnetic ? |
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Answer» `[Fe(CN)_(6)]^(4-)` |
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