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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Cholesterol is the raw material of several important derivatives, discus the a/m statement by naming 6 of these derivatives, their structure and function. |
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| 2. |
What does slaking of lime stand for? |
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Answer» tion:Calcium oxide REACTS vigorously with water to produce slaked lime. This reaction is called 'slaking of lime'. This reaction is a highly exothermic reaction. The hissing sound during this PROCESS is due to the heat produced.hope it works outmark as BRAIN list.... |
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| 3. |
Acidified K2Cr207 solution turns green when S02 gas is passed through it due to formation of (a) Cr2(SO4)3 (b) CrO42- (c) Cr2(SO3)3 (d) CrSO4 |
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Answer» (a)cr2(so4)3Explanation:This reaction is taken as an EXPERIMENTAL VERIFICATION for the presence of sulphur dioxide gas (SO2). The equation for the reaction may be stated as follows:- K2CR2O7 + H2SO4 + 3SO2 ——— K2SO4 + Cr2(SO4)3 + H2O. The orange-coloured dichromate solution will turn green due to the formation of CHROMIUM(III) sulphate, Cr2(SO4)3. It is a redox reaction. Here:- The oxidising agent is potassium dichromate and the reducing agent is sulphur dioxide. Hope it HELPS!!!! |
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| 4. |
Which of the following pairs has the same ionic size? (a) Zr4+, Hf4+ (b) Zn2+, Hf4+ (c) Fe2+, Ni2+ (d) Zr4+, Ti4+ |
| Answer» OPTION (a) is the right ANSWER Explanation:DUE to LANTHANIDES contraction. | |
| 5. |
In which of the following pairs, both the ions are coloured in aqueous solutions? (a) Sc3+, Ti (b) Sc3+, Co2+ (c) Ni2+, Cu+ (d) Ni2+, Ti3+ [Atomic no of Sc = 21, Ti = 22, Ni = 28, Co = 27, Cu = 29] |
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Answer» Option (d) is the RIGHT answer Explanation:Due to presence of UNPAIRED d- orbital electrons. TI3+ has 1 d orbital ELECTRON and is purple in color. Ni2+ has 8 d orbital electron and has Green color. |
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| 6. |
Which of the following is most stable in aqueous solution? (a) Mn2+ (b) Cr3+ (c) V3+ (d) Ti3+ |
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Answer» rect option is Cr3+Explanation:Cr3+ has an electronic configuration of [Ar] 3d3. It has three unpaired electrons. This makes it highly stable in the AQUEOUS solution. Water has two hydrogen and one oxygen which means it dissolves SUBSTANCE that has the ability to donate electrons but crystal field spiting concept applies in CASE of Cr3+ . According to the THEORY, it has t2g in half filled. So, it has no electrons to donate which makes it more stable in water.Learn more about stability of ions from the link below brainly.in/question/13113225 |
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| 7. |
Complete the following reaction: Xe + PtF6 → |
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Answer» Xe + PtF6 → Xe[PtF6]Explanation:XENON react with platinum hexafluoride to produce xenon hexafluoroplatinate(V). This reaction takes place at a temperature of 25-60°C, in the ATMOSPHERE SULFUR hexafluoride.Hope it HELPS! |
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| 8. |
Sulphur disappears when boiled with an aqueous solution of sodium sulphite. Why? |
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Answer» Sulphur disappear when boiled with an AQUEOUS SOLUTION of sodium sulphite because sodium thiosulphate is formed. • Sodium thiosulphate is SOLUBLE in water and so we can observe this disappearance easily in water. • The chemical reaction is Na2SO3+S --->Na2S2O3Explanation: |
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| 9. |
Give a chemical reaction involved in the preparation of interhalogen compound. |
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Answer» ogen atoms react to form an INTERHALOGEN compound. One example includes the reaction when a volume of CHLORINE reacts with an equal volume of FLUORINE at 473K. The resultant product is chlorine monofluoride. In other cases, a halogen atom ACTS with ANOTHER lower interhalogen to form an interhalogen compound. |
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| 10. |
The number of moles of KMnO. that will be needed to react with one mole of SO32- in acidic solution. (a) 1 (b) 3/5 (c) 4/5 (d) 2/5 |
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| 12. |
Which compound led to the discovery of the compounds of noble gas? |
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Answer» hey mate!!By COMBINING XENON with a platinum fluoride, BARTLETT created the first NOBLE gas compound. hope it helps |
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| 13. |
Explain giving a reason for the following situation: In aqueous medium, HCl is a stronger acid than HF. [Foreign 2011] |
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Answer» why in aqueous medium HCl is stronger acid than HF. ... The SIZE of CL- ion being larger than F- ion, the HCl bond is weaker than HF bond. So it can break(dissociate) more easily and LIBERATE H+ ions easily and hence is a stronger acid.msrk mea sbrainlist plz |
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| 15. |
What is peptisation?explain only in one sentence |
| Answer» SEE the definition given below.Explanation:PEPTIZATION is the process responsible for the FORMATION of stable dispersion of COLLOIDAL particles in dispersion medium. | |
| 16. |
Which type of matter would elements fall under, and why? Thanks! |
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Answer» hey mate!!Every element can EXIST in the 3 basic STATES: gas, liquid, solid. Explanation:It is just a matter of enough freezing and HIGH PRESSURE (to solidify gases, even Helium) or enough heat and low pressure (to vaporize metals, even tungsten). At even higher temperatures the gas can ionize, which can be CONSIDERED a 4th state of matter. hope it helps |
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| 17. |
(ii) Ice, water and water vapour look different and display different .. properties, but they are ......... the same. |
| Answer» TER and water VAPOR LOOK different and display different PROPERTIES, but they are ..chemically.. the same. | |
| 18. |
Although the H-bonding in hydrogen fluoride is much stronger than that in water, yet water has a much higher boiling point than hydrogen fluoride. Why? [Foreign 2012] |
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Answer» In a molecule of WATER, there are two hydrogen bond donors, while a hydrogen fluoride molecule only has one donor. There is only one donor in HF, but there are 2 hydrogen ATOMS in H 2 O. The oxygen molecule in water has two lone PAIRS which are capable of accepting two hydrogen bonds. THEREFORE, a single water molecule can have up to 4 hydrogen bonds, i.e., 1 for each hydrogen and 2 for the oxygen. On the other hand, HF can only undergo 2 hydrogen bonds per molecule. |
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| 19. |
Write one chemical reaction equation to show that cone. H2S04 is a strong oxidising agent. |
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| 20. |
Write the formulae of any two oxoacids of sulphur. [AI 2015 Allahabad & Dehradun] |
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Answer» H2S2O7H2SO4H2SO5.... |
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| 21. |
Write one chemical reaction equation to show that SO2 acts as a reducing agent. |
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Answer» Sulphur dioxide is a REDUCING agent but in some REACTIONS, it acts as an Reducing agent:SO2 + H2O -->H2SO3. |
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| 22. |
Despite lower value of its electron gain enthalpy with negative sign, fluorine (F2) is a stronger oxidising agent than Cl2. [Delhi 2019; AI 2012; DoE] |
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Answer» In addition, its small size, the hydration energy of FLUORINE is much HIGHER than that of chlorine. So, the LATTER two factors more than compensate for the less negative electron gain enthalpy of fluorine. Thus, fluorine is a much STRONGER oxidizing agent than chlorine. |
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| 23. |
Ozone is thermodynamically less stable than O2. [True/False] |
| Answer» YES it is TRUE that OZONE is thermodynamically less STABLE than oxygen.plzz mark me as brainlist. | |
| 24. |
Give a chemical reaction involved in chlorine with saturated hydrocarbon. |
| Answer» 2 …presence of SUNLIGHT. ..> CH3CL + HCL. | |
| 25. |
State reason for the following: Sulphur has greater tendency for catenation than oxygen. [Delhi 2013; AI2016,12; DoE] Or O-O bond is weaker than S-S bond, why? [Chennai 2019] |
| Answer» BCOZ BOND is WEAK ..msrk me a sbrainlist PLZ | |
| 26. |
Fluorine does not exhibit any positive oxidation state. Why? [Delhi 2013] |
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Answer» Fluorine is RELATIVELY SMALLER in size and is ELEMENT with high ELECTRONEGATIVE property in periodic table .for fluorine to exibit any positive oxidation state it has to be bounded to negative element even HIGHER than it which is not possible, thus fluorine doesn't exibit positive oxidation state.hope the answer will help you ❤☺ |
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| 27. |
Draw the structure of 03 molecule. |
| Answer» HOPE it's HELPFUL ♥️Refer to ATTACHMENT ☺️ | |
| 28. |
Oxygen does not show +4 and +6 oxidation states like sulphur. Why? |
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Answer» tion:Sulphur shows +4 &. +6 oxidation states DUE to the presence of vacant 3d ORBITALS to which electrons can be promoted from 3s and 3p filled orbitals. Since oxygen atom does not have 2d orbitals, no ELECTORN promotion is possible in this case. THEREFORE, oxygen cannot show +4 &. +6 oxidation states in compounds. |
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| 29. |
Hydrolysis of XeF6 is redox reaction. [True/False] |
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Answer» tion:No, the hydrolysis of XeF6 is not a REDOX reaction because, The oxidation states of all the ELEMENTS REMAINS same in the hydrolysis reaction of XeF6. XeF6 + 3H2O ---> XeO3 + 6HFHence this reaction is not a Redox reaction. |
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| 30. |
Mg displaces iron from iron sulphate.What is the name of the reaction? Give the balanced equation for the same. |
| Answer» FESO4 +MG = MGSO4 + FENAME OF THE REACTION-DISPLACEMENT REACTIONIT'S ALREADY BALANCED | |
| 31. |
How is chloride of lime chemically different from calcium chloride Why des chloride of lime gradually lose its chlorine when gets exposed to air |
| Answer» CHLORIDE of lime is calcium oxy chloride [(Ca(OCl)Cl] ALSO known as BLEACHING powser. Calcium chloride is CaCl2. Bleaching powder loses its chlorine on exposure to air because CO2 present in air reacts with it to evolve chlorine as follows : CaOCl2+CO2Chloride of lime(Bleaching powder)→CaCO3(Air)+Cl2Explanation: | |
| 32. |
How does base give hydroxyl ion..? |
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Answer» Arrhenius ARGUED that bases are neutral compounds that EITHER DISSOCIATE or ionize in water to give OH- ions and a POSITIVE ion. NaOH is an Arrhenius base because it dissociates in water to give the HYDROXIDE (OH-) and sodium (Na+) ions. plz follow me |
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| 33. |
How many ml of ethanol should be mixed with 225 ml of water to make 4.5% (v/v) mixture? |
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| 34. |
The solubility of calcium carbonate is 14 . This rate means that 14 milligrams of calcium carbonate can dissolve in 1 liter of water. How much water would be required to fully dissolve 11 grams of calcium carbonate? Express your answer to the correct number of significant figures. One milligram is equal to 0.001 grams. |
| Answer» TION:rddfhti to fhuyfry DISC tghj kbdvvndonce | |
| 35. |
A solution containing 4.3 g of potassium chloride in 140 mL of solution is what percent (mass/volume) |
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Answer» 3.07%EXPLANATION: |
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| 36. |
What is the ionization reaction of electroplating of copper on iron |
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Answer» tion:fuihg JOG hm u H HAI h h jo hai G gbxhmh jago hinduo KO |
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| 37. |
NaF reacts with SbF6 to form Na+ [SbF7]–. [True/False] |
| Answer» NAF → NA[SbF6] is the CORRECT ANSWER | |
| 38. |
Interhalogen compounds are more reactive than helogens except fluorine. [True/False] |
| Answer» TRUE HOPE it helpsmark me BRAINLIEST | |
| 39. |
Tin reacts with excess of chlorine gas to form ___________ . |
| Answer» TIN will react with DRY chlorine gas to produce anhydrous tin(IV) chloride. The reaction is very exothermic. ... A flask containing SODIUM hydroxide is used to ABSORB excess chlorine gas that doesn't react with the tin.msrk as brainlist | |
| 40. |
I22 gets oxidised to ___________ by cone. HNO3. |
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Answer» 10HNO3 + I2⟶ 2HIO3 + 10NO2 + 4H2O |
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| 41. |
Assertion: NaCl reacts with concentrated H2SO4 to give colourless fumes with pungent smell. But on adding MnO2 the fumes become greenish yellow. Reason: Mn02 oxidises HC1 to chlorine gas which is greenish yellow. [NCERT Exemplar] |
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Answer» Both A and R is TRUE and R is the CORRECT EXPLANATION of A. |
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| 42. |
Out of H2O and H2S which has higher bond angle? ___________ . |
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Answer» here's the ANSWER...WATER moecule has GREATER BOND ANGLE..that is H2O104° |
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| 43. |
C1F is neutral molecule isoelectronic withCIO–. [True/False] |
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Answer» Truehope it HELPS MARK me BRAINLIEST |
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| 44. |
Assertion: Both rhombic and monoclinic sulphur exist as S8 but oxygen exists as O2. Reason: Oxygen forms pπ – pπ multiple bond due to small size and small bond length but pπ – pπ bonding is not possible in sulphur. [NCERT Exemplar] |
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Answer» Both A and R is TRUE and R is CORRECT EXPLANATION of A . |
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| 45. |
Which of the following orders are correct as per the properties mentioned against each? [NCERT Exemplar] (a) AS2O3 < SiO2 < P2O3 < SO2 Acid strength. (b) AsH3 < PH3 < NH3 Enthalpy of vapourisation, (c) S < O < Cl < F More negative electron gain enthalpy. (d) H2O > H2S > H2Se > H2Te Thermal stability. |
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Answer» bcadmark me as BRAINLIST |
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| 46. |
Lead sulphide is heated with air to form ___________ . |
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Answer» Lead sulphide is heated with AIR to FORM :lead (ll) oxide bo) and SULPHUR dioxide. hope U like PLEASE like and follow me...... |
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| 47. |
The mixture of cone. HCl and anhydrous ZnCl2 is called ___________ . |
| Answer» HYDROGEN ZINCATE is the CORRECT ANSWER...that is the FILL up | |
| 48. |
Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices. (Q.27 to Q.29) (a) Both assertion and reason are correct statements, and reason is the correct explanation of the assertion. (b) Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion. (c) Assertion is correct, but reason is wrong statement. (d) Assertion is wrong but reason is correct statement. (e) Both assertion and reason are wrong statements. 37. Assertion: HI cannot be prepared by the reaction of KI with concentrated H2SO4. Reason: HI has lowest H-X bond strength among halogen acids.[NCERT Exemplar] |
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Answer» het and then the FIRST place for your kind consideration a little too long ago but it was so great and it will have no plans have attached it doesn't work well it LOOKS pretty NICE meeting I just bought at a much smaller bangla de este for more options TA and he just need this message please check is there anyone have attached herewith to take any help but in TOUCH to work |
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| 49. |
What is the colour of the pH paper if it is dipped in a grape juice solution |
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Answer» the COLOUR is ORANGE/ MARK me BRAINLIEST |
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