InterviewSolution
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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.
| 1901. |
Which is primary alcohol |
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Answer» Butane-2-ol |
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| 1902. |
Which one of the following is tris (ethane-1, 2-diammine) cobalt (III) sulphate? |
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Answer» `[Co_3(EN)]SO_4` |
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| 1903. |
Which of the following solution has highest equivalent conductance? |
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Answer» 0.01 M KCl |
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| 1904. |
What are the consequences that lead to the development of quantum mechanical model of an atom ? |
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Answer» Solution :In 1923 Louis de-Broglie proposed that like light MATTER also has dual character . It exhibits wave as well as particle nature . He derived an equation to calculate the wave-length`(lamda)` of the wave associated with a particle of mass m , nmoving with velocity v and it is given by `lamda=(h)/("mv")" (or)"lamda=(h)/(p)` 'h' is Planck's constant and P is momentum of the particle . It may be noted that wave character has significance only in the case of sub-microscopic particles such as electrons. The precise location of a wave cannot be predicted as a wave is not located at a particular point but EXTENDS in space . Thus the wave nature of electron puts some restriction in finding the position precisely . W . Heisenberg put forward this limitation in the form of uncertainty principle . According ot Heisenberg, "It is not possible to determine simultaneously and accurately both the position and momentum of a small moving particle , such as electron." It can be EXPRESSED mathematically as , `DELTA"x"xxDeltapge(h)/(4pi)` `Delta"x"xxmDeltavge(h)/(4pi)` where `Deltax` = uncertainty in position `Deltap` = uncertainty in momentum m = mass of particle `Deltav` = uncertainty in velocity h = Planck's constant. The uncertainty principle is due to the direct consequence of dual nature of matter . Amicroscopic object such as electron has both observable wave - like and particle - like properties . The behaviour of such particles cannot be explained on the basis of science called quantum mechanical MODEL of atom was developed . Quantum mechanics is a theroretical science that takes into account the dualnature of matter . |
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| 1905. |
Which of the following ore is/are extracted from its oxide by sir reduction method |
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Answer» Solution :Oxides of unreactive metals LIKE Hg, Pb, Cu are reduced by air. (Self reduction are auto reduction) `{:(2HgS+3O_(2) to 2HgO+2SO_(2)),(2HgO+HgS to 3HgSO_(2)),(2Cu_(2)S+3O_(2) to 2Cu_(2)O+3SO_(2)),(Cu_(2)S+2Cu_(2)O to 6Cu+SO_(2)),(2Pbs+3O_(2) to 2PbO+3SO_(2)),(2PbO+Pbs to 3Pb+SO_(2)):}` |
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| 1906. |
The vapour density of undecomposed N_(2)O_(4) is 46. When heated, the vapour density decreases to 24.5 due to its dissociation to NO_(2). The per cent dissociation of N_(2)O_(4) at the final temperature is |
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Answer» 88 |
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| 1907. |
Which reaction has positive value of DeltaG^(@)? |
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Answer» `F_(2)+H_(2)O overset(R.T.)to2HF+(1)/(2)O_(2)uarr`<BR>`Cl_(2)+H_(2)O overset(R.T.)toHCl+HOCl` |
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| 1909. |
Which of the following methods is useful for separating pure forms of low melting metals? |
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Answer» Liquidation |
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| 1910. |
Two half cells are: Al^(3+)(aq)//Al and Mg^(2+)(aq)//Mg. The reduction potentials of these half cells are -1.66V and -2.36 V respectively. Calculate the cell potential. Write the cell reaction also. |
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Answer» `3mg+2Al^(3+)to3Mg^(2+)+Al` `E_(cell)^(@)=E_(Al^(3+)//Al)^(@)-E_(Mg^(2+)//Mg)^(@)=-1.66-(-2.36)V=0.70V`. |
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| 1911. |
Which one of the following is an example of a hydrophobic colloidal sol? |
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Answer» A jolly |
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| 1912. |
Which of the following is the wrong statement |
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Answer» ONCl and `ONO^(-)` are isoelectronic `ONO^(-) = 8+7+8+1 =24E^(-)` |
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| 1913. |
Which statement is incorrect about peptide bond? |
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Answer» C-N bond length in proteins is longer than usual C-N bond length  C -N bond in proteins acquires some double bond CHARACTER, hence shorter in length. |
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| 1914. |
Which of the following materials exhibitssublimation ? |
| Answer» Answer :D | |
| 1915. |
What is the difference between native protein and denatured protein ? |
| Answer» Solution :Proteins found in a BIOLOGICAL system with UNIQUE 3D-structure and biological ACTIVITY is called native protein. When native protein is SUBJECTED to physical and chemical change , protein loses its biological activity and is called DENATURED protein. | |
| 1916. |
The solubility product of strontium fluoride is 8.0xx10^(-11). At what concentration of Sr^(2+)ion the precipitation of strontium fluoride would start from a solution containing 0.01 M F^(-) ion ? |
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Answer» `8.xx10^(-9)M` `[Sr^(2+)](0.01)^(2)=8.0xx10^(-11)` `therefore [Sr^(2+)]=8.0xx10^(-7)M` |
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| 1917. |
Two reactions are said to be coupled if |
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Answer» Both `deltaG_1` and `deltaG_2` are NEGATIVE |
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| 1918. |
What are the functions performed by histamine in the body? |
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Answer» Solution :Histamine is a potent vasodilator. It performs various functions in the body. (i) It contracts muscles in gut and bronchi. (ii) It RELAXES some other muscles. e.g., in the WALLS of blood vessels. (iii) It is responsible for CONGESTION in the note associated with common COLD and ALLERGIES. (iv) It stimulates the release of pepsin and `HCI` in stomach. |
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| 1919. |
Thevalueof therate constantof a pseudofirst order reaction ……… . |
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Answer» Â depends on the CONCENTRATION of REACTANTS present in small amount e.g.. HYDROLYSIS of ethyl acetate in presence of excess of water `CH_(3)COOC_(2)H_(5) +underset("excess")(H_(2)O) overset(H^(+)) to CH_(3)COOH+ C_(2)H_(5)OH` `r = k [ CH_(3)COO C_(2)H_(5)]^(2) [H_(2)O]^(O)` Excess `[H_(2)O]` can cause the independency of reaction on `H_(2)O`. Hence, (a) is the correct choice. |
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| 1920. |
The reduction potential of hydrogen half-cell will be negative if:- |
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Answer» `P_((H_(2)))=1atm" "and [H^(+)]=2.0M` `E_(red)=E_(red)^(@)-(0.0591)/(N)log((P_((H_(2))))/((H^(+))^(2))` `E_(red)=0-(0.0591)/(2)log((2)/((1)^(2))` `E_(red)=(0.0591)/(2)log2` `thereforeE_(red)` is found to be negative for (c) option. |
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| 1921. |
To 5.85 gm of NaCl one kg of water is added to prepare a solution. What is the strength of NaCl in this solution (mol. wt.Of NaCl = 58.5) |
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Answer» 0.1 Normal |
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| 1922. |
Which chemical stimulate the secertion of pepsin and HCI in sotmach |
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Answer» HISTAMINE |
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| 1923. |
When potassium hexachloridoplatinate (IV) is dissolved in water, the solution : |
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Answer» CONTAINS 6 ions per molecule |
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| 1924. |
Which substance is 2000 times sweeter than sugar ? |
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Answer» Aspartame |
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| 1925. |
Which one of he following complexes is not expected to exhibit isomerism ? |
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Answer» `[Ni(NH_3)_4 (H_2O)_2]^(2+)` |
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| 1926. |
The total kinetic energy of 2 mol of an ideal gas at 127^(@)C is ( Use R = 8.3 JK^(-1) mol^(-1) ) |
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Answer» 9.96 kJ |
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| 1927. |
The value of K_(c) for the reaction 3O2(g) 2O3 (g) is 1.7 × 10–56 at 25°C. Do you expect pure air at 25°C to contain much O_(3) (ozone) when O_(2) and O_(3) are in equilibrium ? If the equilibrium concentration of O2 in air at 25°C is 8 x×10^(-3) M, what is the equilibrium concentration of O_(3) ? |
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Answer» |
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| 1928. |
What happens to structure of CsCl when it is heated to 760 K? |
| Answer» SOLUTION : It CHANGES to NACL STRUCTURE, | |
| 1929. |
Write test to distinguish between (i) Phenol and carboxylic acid (ii) Formic acid and acetic test. |
| Answer» Solution :(i) `NaHCO_(3)` test , (II) TOLLEN's REAGENT test. | |
| 1931. |
Which of the following is not soluble in sodium hydrogen carbonate ? |
| Answer» Solution :Carbolic acid | |
| 1932. |
Why are the two S-O bonds in SO_(2) molecule of equal strength? |
| Answer» Solution :The TWO `S-O` BONDS in `SO_(2)` molecules are of equal LENGTH DUE to hybridization. | |
| 1933. |
What are the different steps involved in the mechanism of catalytic activity ? |
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Answer» Solution :Different steps involved in the mechanism of catalytic activity: (i) Diffusion of the reactants to the surface of the catalyst takes PLACE. (ii) Adsorption of reactant MOLECULES on the surface of the catalyst takes place. (iii) Chemical reaction between the reactants takes place on the catalyst surface resulting in the formation of intermediate compound. (IV) The PRODUCTS formed are desorbed from the catalyst surface, thereby making space for other reactant molecules to form the products. (V) Diffusion of reaction products away from the catalyst surface. This theory explain why the catalyst remains unchanged in mass and chemical composition at the end of the reaction. |
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| 1934. |
Which chloroderivatives of benzene among the following would undergoes hydrolysis with aq. NaOH to furnish the corresponding hydroxy compounds? |
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Answer»
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| 1935. |
What happens when H_2S reacts with CuSO_4 in acidic medium ? |
| Answer» SOLUTION :`CuSO_4 + H_2S RARR CUS + H_2SO_4` | |
| 1936. |
The solubility product values of barium sulphate and barium carbonate 1.0xx10^(-10) and 5.0xx10^(-9) respectively. When these two salts are equilibriated in pure water then ratio of their solubilities is , |
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Answer» 0.02 |
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| 1937. |
Whenever a mixture of gases is allowed to come in contact with a particular adsorbent under the same conditions, the more strong adsorbate is adsorbed to greater extent irrespective of its amount present, e.g. H_(2)O is adsorbed to more extent on silica gel than N_(2) and O_(2). This shows that some adsorbates are preferentially adsorbed. It is also observed that preferentially adsorbable adsorbent can displace a weakly adsorbed substance from the surface of an adsorbent. When temperature is increased |
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Answer» extent of ADSORPTION increases |
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| 1938. |
Whenever a mixture of gases is allowed to come in contact with a particular adsorbent under the same conditions, the more strong adsorbate is adsorbed to greater extent irrespective of its amount present, e.g. H_(2)O is adsorbed to more extent on silica gel than N_(2) and O_(2). This shows that some adsorbates are preferentially adsorbed. It is also observed that preferentially adsorbable adsorbent can displace a weakly adsorbed substance from the surface of an adsorbent. Activated charcoal is prepared by |
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Answer» heated charcoal with steam so that it becomes more porous |
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| 1939. |
Yellow ammonium sulphide is a suitable reagent for the separation of |
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Answer» `Bl_(2)S_(3)` and CuS Hence,(D) is the correct answer. |
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| 1940. |
Which among the following is not an antibiotic ? |
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Answer» Penicillin |
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| 1941. |
The statement that , .. It is possible to choose along the three coordinate axes unit distance a,b,c not necessarily of the same length ,such that the ratio of there intercepts of any plane in the crystal ,is given by in ma : nb:pc where m,n,p are either integral whole numbers including infinity or fraction of whole number, ..is known as : |
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Answer» Hauy's LAW of RATIONALITY ofindices |
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| 1942. |
What is the order of acidic character of primary, secondary and tertiary alcohols? |
Answer» Solution :The `1^(@),2^(@) and 3^(@)` alcohols have one, two and three alkyl groups on the CARBON atom attached to the OH group as shown below:  Since alkyl groups have +I-effect, therefore, electron density in O-H bond INCREASES from `1^(@)` to `3^(@)` alcohols. In other WORDS, the O-H bond in `3^(@)` alcohols is the strongest and hence most difficitul to break followed by O-H bond in `2^(@)` alcohols while the O-H bond in `1^(@)` alcohols is the weakest and hence most easy to break. THUS, the acid STRENGTH of alcohols follows the order: primarygtsecondarygttertiary. |
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| 1943. |
Write the structure of MnO_4^(2-) and MnO_(4)^(-) ions. |
Answer» SOLUTION :
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| 1944. |
What happens when ethyl iodide is treated with Alcoholic KOH? |
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Answer» Solution :When ethyl iodide reacts with ALCOHOLIC KOH ethylene is FORMED. underset(Ethyliodide)(C_2H_5I)+KOH(ALC.) rarr underset(ETHYLENE)(C_2H_4)+KI+H_2O` |
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| 1945. |
Which onr of the following statements is wrong ? |
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Answer» The conductivity of metals decreases withincrease in temperature |
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| 1946. |
Which option is incorrect for 2NO_((g))+O_(2(g))to2N)(2(g))? |
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Answer» `(-1)/(2)(-d[NO])/(DT)` |
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| 1947. |
Which has a pyramidal structure |
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Answer» TRIMETHYLAMINE |
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| 1948. |
What are lyophilic colloids? Give examples. |
| Answer» Solution :(i) Colloidal solutions in which the dispersed phase has considerable affinity for the DISPERSION medium are called lyophilic (SOLVENT LOVING) colloids. Gelatin, PROTEIN and starch are EXAMPLES of this type. | |
| 1949. |
Whch of the following will not follow sidgwick's EAN rule ? |
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Answer» `[Fe(CO)_(5)]` |
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| 1950. |
What is laughing gas ? How is it prepared? |
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Answer» Solution :`N_2O` is NAMED as LAUGHING gas. It is PREPARED by HEATING ammonium nitrate. `NH_4NO_(30 OVERSET(Delta) rarr N_2O + 2H_2O` |
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