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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.
| 5001. |
If an element has a low ionisation energy, then it is likely to be __________. (metallic/ nonmetallic). |
| Answer» SOLUTION :METALLIC | |
| 5002. |
If an element A belongs to period 3 and group 2, then it will have |
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Answer» 3 shells and 2 VALENCE ELECTRONS |
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| 5003. |
If an electrolyte is described as strong electrolyte what does this mean ? |
| Answer» SOLUTION :It is COMPLETELY ionised in AQUEOUS solution . | |
| 5004. |
If an atom of an element has eight electrons in a subshell having five orientations of 4th energy level, write the electronic configuration of the element and four quantum numbers for valence electrons |
| Answer» SOLUTION :IDENTIFICATION of quantum numbers CORRESPONDING to the NUMBER of ORIENTATIONS: | |
| 5005. |
If an activated complex is formed in chemical reactions according to the collision theory, which of the following is true with respect to its stability ? |
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Answer» It is HIGHLY stable because it has high energy |
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| 5006. |
If a person is working on a treadmill in a gymnasium will it effect his rate of breathing ? How? |
| Answer» SOLUTION :Yes, it will AFFECT his rate of BREATHING. It will become fast to supply more oxygen to meet the INCREASED demand of energy. | |
| 5007. |
If a molecule Y contains two C = C double bonds, then how many moles of H_2are required for complete hydrogenation of one mole of Y? |
| Answer» SOLUTION :TWO MOLES of `H_2` | |
| 5008. |
If amoleculecontainsmore thanthreeatoms , it is called______ molecule. |
| Answer» SOLUTION :POLYATOMIC | |
| 5009. |
If a metal is to be electroplated with silver, what would happen if a solution of silver nitrate alone is used as an electrolyte ? What is the preferable electrolyte and why is it used ? |
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Answer» Solution :(i) Purpose of silver plating (ii) Solubility of silver nitrate (iii) Quantity of ions present in the electrolyte. (iv) RELATION between the quantity of ions present in the electrolyte and the quality of coating. (v) Soluble salt of silver that can form a COMPLEX with NaCN. (VI) IOns produced from the complex (VII) Change in the concentration of ions due to the complex formation. (viii) Effect of change in concentration of ions on quality of plating. |
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| 5010. |
If a gas occupies 30 L at27^(@)C and 1 atm, what volume would it occupy at 227^(@)C and 5 atm? |
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Answer» Solution :`{:("Initial condition",,"Final condition"),(V_(1) = 301,,V_(2) =?),(P_(1)=1" atm",,P_(2) = 5" atm"),(T_(1) = 27^(@)C = 300 K,,T_(2) = 227^(@)C = 500K):}` According to GAS equation, `(P_(1)V_(1))/T_(1)= (P_(2)V_(2))/T_(2) V_(2)=(P_(1)V_1)/T_(1) xxT_(2)/P_(2) = (30 xx1)/300xx500/5 = 10 ` L |
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| 5011. |
If a few drops of a concentrated acid accidentally spills over the hand of student what should be done? |
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Answer» wash thehand with saline solution |
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| 5012. |
If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done ? |
| Answer» SOLUTION :The hand is WASHED immediately with plenty of water and a paste of sodium hydrogencarbonate (a BASE) is APPLIED to NEUTRALISE the acid. | |
| 5013. |
If 20 electrons are present in the 4th orbit then the atomic number of that element is |
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Answer» 58 |
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| 5014. |
If 15mg of N_(2)O_(3) is added to 4.82 xx 10^(20) molecules of N_(2)O_(3), thetotal volume occupied by thegas at STP is |
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Answer» `0.044` L ` = (76 xx 4.82 xx 10^(20))/(6.023 xx 10^(23)) g = 0.061` g 15 mg of ` N_(2)O_(3) = 0.015` g `:." Total weight of "N_(2)O_(3) = 0.061 + 0.015 = 0.076` g 76 g occupies 22.4 L at STP. 0.076 g occupies ? L at STP. ` = (0.076 xx 22.4)/(76) = 0.022` L |
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| 5015. |
Identify 'x,'y' and 'z' in the following balanced equation : xPb(NO_(3))_(2)(s)overset("Heat")(to)yPbO(s)+zNO(g)+O_(2)(g) |
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Answer» 2,4,2 |
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| 5016. |
Identify the wrong statements and correct them. (i)Sodium benzoate is used in food preservative (ii)Nitric acid is not used as fertilizer in agriculture. (iii)Sulphuric acid is called the king of chemicals (iv)The pH of acid is greater than 7 (v)Acetic acid is used in aerated drinks. |
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Answer» SOLUTION :(i)correct statement (II)WRONG statement.Nitric acid is used as a FERTILIZER in agriculture. (iii)Correct statement (iv)Wrong statement. The pH of the acid is lesser than 7 (v)Wrong statements.Carbonic acid is used in aerated drinks. |
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| 5017. |
Identify the weak electrolyte from the following: (A) Sodium chloride solution (B) Dilute hydrochloric acid (C) Dilute sulphuric acid (D) Aqueous acetic acid |
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Answer» Sodium CHLORIDE solution |
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| 5018. |
Identify the type of reaction in the following examples: (i) Na_(2)SO_(4)(aq)+BaCl_(2)(aq)rarrBaSO_(4)(s)+NaCl(aq) (ii) Fe(s)+CuSO_(4)(aq)rarrFeSO_(4)(aq)+Cu(s) (iii) 2H_(2)(g)+O_(2)(g)rarr2H_(2)O(l) |
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Answer» Solution :(i) Double DISPLACEMENT reaction (II) Displacement reaction (III) Combination reaction |
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| 5019. |
Identify the type of reaction for the following reaction : 2KClO_(3)(s) underset("Catalyst")overset("Heat")to 2KCl(s)+3O_(2)(g) |
| Answer» SOLUTION :DECOMPOSITION and ENDOTHERMIC | |
| 5020. |
Identify the type of reaction from the following equations: (i) CH_(4)+2O_(2)rarr CO_(2)+2H_(2)O " " (ii) Pb(NO_(3))_(2)+ 2KI rarr PbI_(2)+2KNO_(3) (iii) CaO+H_(2)Orarr rarr Ca(OH)_(2) " " (iv) CuSO_(4)+Znrarr ZnSO_(4) + Cu |
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Answer» Solution :(i) EXOTHERMIC /Oxidation REACTION (II) Double DISPLACEMENT Reaction (iii) Combination Reaction (IV) Displacement Reaction. |
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| 5021. |
Identify the type of reaction for 2Al + Cr_(2)O_(3) to Al_(2)O_(3) + 2Cr (i) Oxidation ( ii) Reduction (iii) Redox |
| Answer» Solution : (i), (ii), (iii) | |
| 5022. |
Identify the type of reaction from the following equation and define it. CH_(4)+2O_(2)rarrCO_(2)+2H_(2)O+"Heat" |
| Answer» SOLUTION :Exothermmic reaction: It is a reaction in which HEAT ENERGY is released ALONG with the FORMATION of products. | |
| 5023. |
Identify the type of each of the following reactions. Also write balanced chemical equation for each . (i) The reaction mixture becomes warms . (ii) An insoluble substance is formed. |
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Answer» Solution :(i) EXOTHERMIC REACTION `CaO+H_(2)OrarrCa(OH)_(2)` (II) Double displacement reaction . `BaCl_(2)+Na_(2)SO_(4)rarrBaSO_(4)+2NaCl` |
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| 5024. |
Identify the type of chemical reactions in the following equations : Pb(NO_(3))_(2)+Kl to Pbl_(2)+2KNO_(3) |
| Answer» SOLUTION :DOUBLE DISPLACEMENT REACTION and PRECIPITATION reaction | |
| 5025. |
Identify the type of chemical reactions in the following equations : CuSO_(4)+Zn to ZnSO_(4)+Cu |
| Answer» SOLUTION :DISPLACEMENT REACTION | |
| 5026. |
Identify the type of chemical reactions in the following equations : CH_(4)+2O_(2) to CO_(2)+H_(2)O |
| Answer» SOLUTION :EXOTHERMIC REACTION | |
| 5027. |
Identify the type of chemical reactions in the following equations : CaO+H_(2)O to Ca(OH)_(2) |
| Answer» SOLUTION :COMBINATION REACTION | |
| 5028. |
Identify the type of chemical reaction taking place (i) on mixing a solution of potassium chloride with silver nitrate, an insoluble white substance is formed. (ii) on heating green coloured ferrous sulphate crystals, reddish-brown solid is left and smell of a gas having odour of burning sulphur is observed. |
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Answer» Solution :(i) `underset("chloride")underset("Potassium")(KCl(aq))+underset("nitrate")underset("Silver")(AgNO_(3)(aq))rarrunderset(("White precipitate"))underset("Silver chloride")(AGCL(s))+underset("nitrate")underset("Potassium")(KNO_(3)(aq)` This reaction is an example of double displacement and precipitation reaction in which a precipitate of silver chloride is obtained. (ii) `underset(("Green"))underset("Ferrous sulphate")(2FeSO_(4)(s))overset("Heat")rarrunderset(("Reddish-brown"))underset("Ferric OXIDE")(Fe_(2)O_(3)(s))+SO_(2)(g)+SO_(3)(g)` This reaction is an example of decomposition (thermal decomposition) reaction because a single SUBSTANCE `(FeSO_(4))` breaks down into THREE substances `(Fe_(2)O_(3),SO_(2)andSO_(3))`. Here, `SO_(2)` gives the smell of burning sulphur. |
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| 5029. |
Identify the type of chemical reaction in thefollowing statements and define each of them: (i) Digestion of food in our body (ii) Rusting of iron (iii) Heating of manganese dioxide with aluminium powder (iv)Blue colour of copper sulphate solution disappears when iron filings are added to it |
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Answer»
(Oxidation Reaction : When an iron object is LEFT in most air for a considerable TIME , it gets coveredwith a red brown flaky substance CALLED rust. (iii) DISPLACEMENT reaction : More reaction metal displaces LESS reaction metal from itssalt solution . |
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| 5030. |
Identify the term or substance based on the descriptions given below:The property by virtue of which the compound has the same molecular formula but different structural formulae. |
| Answer» SOLUTION :ISOMERISM | |
| 5031. |
Identify the term or substance based on the descriptions given below:Ice-like crystals formed on cooling an organic acid sufficienty. |
| Answer» SOLUTION :Ethanonic ACID | |
| 5032. |
Identify the term or substance based on the descriptions given below:Hydrocarbon containing a triple bond used for welding purposes. |
| Answer» SOLUTION :ETHYENE | |
| 5033. |
Identify the substances that are oxidized and the substances that are reduced in the following reactions : 4Na(s)+O_(2)(g)to2Na_(2)O(s) |
| Answer» SOLUTION :`NA` is OXIDIZED and `O_(2)` is REDUCED. | |
| 5034. |
Identify the substances that are oxidised and the substances that are reduced in the reaction : 4Na(s)+ O_(2)+ 2Na_(2)O(s) |
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Answer» Solution :`4Na(s)+ O_(2)+ 2Na_(2)O(s)` In this REACTION, sodium (Na) metal is oxidised to `Na_(2)O` and `O_(2)` is REDUCED. |
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| 5035. |
Identify the substances that are oxidised and the substances that are reduced in the reaction : CuO(s)+ H_(2)(g) to Cu(s)+H_(2)O(I) |
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Answer» Solution :`CUO(s)+ H_(2)(G) to CU(s)+H_(2)O(I)` In this reaction, CuO is reduced to Cu, while `H_(2)` is oxidised to `H_(2)O` |
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| 5036. |
Identify the substances that are oxidised and the substances that are reduced in the following reactions : CuO(s)+H_(2)(g)toCu(s)+H_(2)O(l) |
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Answer» SOLUTION :`underset("COPPER oxide")(CUO(s))+underset("Hydrogen")(H_(2)(g))tounderset("Copper")(CU(s))+underset("Water")(H_(2)O(l))` In this reaction, CuO is reduced because it loses oxygen. `H_(2)` is oxidised because it combines with the oxygen of CuO to form water. |
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| 5037. |
Identify the substances that are oxidised and the substances that are reduced in the following reactions : 4Na(s)+O_(2)(g) to2Na_(2)O(s) |
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Answer» SOLUTION :`UNDERSET("Sodium")(4Na(s))+underset("Oxygen")(O_(2)(g))tounderset("Sodium oxide")(2Na_(2)O(s))` In this reaction, sodium is oxidised because it combines with oxygen to FORM sodium oxide. Oxygen is reduced because it is converted into sodium oxide. |
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| 5038. |
Identify the substance Q based on the information given below: The white crystalline solid Q is soluble in water. It liberates a pungent smelling gas when heated with sodium hydroxide solution. |
| Answer» SOLUTION :Q = Ammonium CHLORIDE `(NH_(4)Cl)` | |
| 5039. |
Identify the substances that are oxidised and the substances that are reduced in the following reactions. 4Na(s)+O_2(g)to2Na_2O(s) |
| Answer» SOLUTION :SODIUM (NA) is oxidised as it gains OXYGEN and oxygen gets REDUCED. | |
| 5040. |
Identify the substance R based on the information given below: The pale green solid R turns reddish brown on heating. Its aqueous solution gives a white precipitate with barium chloride solution. The precipitate is insoluble in mineral acids. |
| Answer» Solution :R = IRON (II) sulphate `(FeSO_(4)*7H_(2)O)` | |
| 5041. |
Identify the substances P, Q and R in each case based on the information given below: The salt P turns yellow on dissolving in water and gives a reddish brown precipitate with sodium hydroxide solution. |
| Answer» SOLUTION :P = IRON (III) choride `(FeCl_(3))` | |
| 5042. |
Identify the substances oxidised, substance reduced, oxidising agent and reducing agent: MnO_(2)+4HClrarrMnCl_(2)+2H_(2)O+Cl_(2) |
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Answer» SOLUTION :SUBSTANCE oxidised : `HCl` Substance REDUCED : `MnO_(2)` OXIDISING agent : `MnO_(2)` REDUCING agent : `HCl` |
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| 5043. |
Identify the substances oxidised and the substances reduced in the following reactions: (i) 4Na(s)+O_(2)(g)rarr2Na_(2)O(s) (ii) CuO(s)+H_(2)(g)rarrCu(s)++H_(2)O(l) |
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Answer» Solution :(i) In this reaction, sodium (Na) is changed into sodium oxide `(Na_(2)O)`. This is the addition of oxygen to sodium. Since addition of oxygen is CALLED oxidation, therefore, the substance sodium (Na) is oxidised. Oxygen `(O_(2))` is changed into `Na_(2)O`. Here, the addition of METAL to oxygen TAKES place. So, the substance reduced is oxygen. (ii) Here, COPPER oxide is reduced to copper metal whereas hydrogen is oxidised to water. |
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| 5044. |
Identify the substance which acts as an oxidising agent and reducing agent in the following reaction : (i) H_(2)(g) +Cl_(2)(g) to 2HCl(g) (ii) 2Al(s) + Cr_(2)O_(3)(s) to Al_(2)O_(3)(s) +2Cr(s) |
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Answer» Solution :`Cl_(2)` in reaction (i) and `Cr_(2)O_(3)` in reaction (ii), ACTS as an OXIDISING AGENT. While, `H_(2)` in reaction (i) and Al, in reaction (ii) acts as a reducing agent. |
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| 5045. |
Identify the substances that are oxidized and the substances that are reduced in the following reactions : CuO(s)+H_(2)(g)toCu(s)+H_(2)O(l). |
Answer» SOLUTION : SUBSTANCE reduced=CuO Substance oxidish=`H_(2)` |
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| 5046. |
Identify the substance that are oxidised and the substances that are redured in the following reactions. (i) 4Na(S)+O_(2)(g)rarr2Na_(2)O(S) (ii) CuO(S)+H_(2)(g)rarrCu(S)+H_(2)O(l) |
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Answer» SOLUTION :(i) Sodium is LOSING the electrons to oxygen, so it is oxidised. Oxygen is GAINING the electrons, so it is reduced. (ii) `H_(2)`is oxidised into water. CuO is reduced to Cu metal. |
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| 5047. |
Identify the species that can give both conjugate acid and conjugate base |
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Answer» `NH_(4)^(+)` |
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| 5048. |
Identify the species for which Delta_(f) H^(theta) = O_(3), at 298 K, Br_(2), Cl_(2) , CH_(4) |
| Answer» SOLUTION :`Cl_(2)` (`Br_(2)` is liquid at 298 K) | |
| 5049. |
Identify the set of metals that require same amount of charge for the equation of one mole of metals |
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Answer» Na, AG, Al |
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| 5050. |
Identify the reducing agent in the following reaction : Reaction : 3O_(2)(g)+2H_(2)S(g) to 2H_(2)O (l)+2SO_(2)(g) |
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Answer» `O_(2)` |
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