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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.
| 2301. |
On electrolysis, which of the following does not give outoxygen?(a) Acidic water using Pt electrode(b) Fused NAOH using Pt electrode(c) Dilute H2S04 using Pt electrode(d) Dilute H2SO4 using Cu electrode |
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Answer» On electrolysis, which of the following does not give out oxygen? (a) Acidic water using Pt electrode (b) Fused NAOH using Pt electrode (c) Dilute H2S04 using Pt electrode (d) Dilute H2SO4 using Cu electrode |
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| 2302. |
State the factors that influence the preferential discharge of ions at the electrodes. |
| Answer» State the factors that influence the preferential discharge of ions at the electrodes. | |
| 2303. |
What will be the reaction when HCI reacts with H2SO4? |
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Answer» What will be the reaction when HCI reacts with H2SO4? |
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| 2304. |
If HCI is added to a mixture of p-nitrotoluene anda metal (such as Sn) at high temperature and theproduct obtained is further treated with a base, thefinal product would be(1) p-toluidine(2) Toluene2(3) p-chlorotoluene |
| Answer» If HCI is added to a mixture of p-nitrotoluene anda metal (such as Sn) at high temperature and theproduct obtained is further treated with a base, thefinal product would be(1) p-toluidine(2) Toluene2(3) p-chlorotoluene | |
| 2305. |
How does ionisation energy vary along the period and down the group in s-block elements?Why does this variation occur? |
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Answer» How does ionisation energy vary along the period and down the group in s-block elements?Why does this variation occur? |
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| 2306. |
How does the use of a catalyst affect the decomposition of potassium chlorate? |
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Answer» How does the use of a catalyst affect the decomposition of potassium chlorate?
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| 2307. |
46 0.126g of an acid requires 20 ml of0.1 NAOH for complete neutralization . equivalent wieght of the acid is (1) 45 (2) 53 (3) 40 (4) 63 |
| Answer» 46 0.126g of an acid requires 20 ml of0.1 NAOH for complete neutralization . equivalent wieght of the acid is (1) 45 (2) 53 (3) 40 (4) 63 | |
| 2308. |
What is the majority constituent of biogas? |
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Answer» What is the majority constituent of biogas? |
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| 2309. |
What is the role of cryolite (Na3AlF6) in the electrolytic reduction of alumina in the Hall's process? |
| Answer» What is the role of cryolite (Na3AlF6) in the electrolytic reduction of alumina in the Hall's process? | |
| 2310. |
The IUPAC name of the given compound is |
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Answer» The IUPAC name of the given compound is
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| 2311. |
During the electrolytic reduction of alumina, which of the following element is deposited at the cathode? |
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Answer» During the electrolytic reduction of alumina, which of the following element is deposited at the cathode? |
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| 2312. |
Sulphuric acid was initially called ___. |
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Answer» Sulphuric acid was initially called |
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| 2313. |
A student was asked to carry out a chemical reaction by placing four different metal strips in CuSO4 solution for a considerable time, one by one. Which of the following metal strip will turn the blue CuSO4 solution to a light green solution in due course of time ?(1) Fe(2) Au(3) Mg(4) Ag |
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Answer» A student was asked to carry out a chemical reaction by placing four different metal strips in CuSO4 solution for a considerable time, one by one. Which of the following metal strip will turn the blue CuSO4 solution to a light green solution in due course of time ? (1) Fe (2) Au (3) Mg (4) Ag |
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| 2314. |
Explain how harmful chemicals enter our bodies. |
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Answer» Explain how harmful chemicals enter our bodies. |
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| 2315. |
With the help of labelled diagram, describe an activity to show that acids produce ions only in aqueous solution? |
| Answer» With the help of labelled diagram, describe an activity to show that acids produce ions only in aqueous solution? | |
| 2316. |
Answer the questions below, relating your answers only to salts in the following list:sodium chloride, anhydrous calcium chloride, copper sulphate-5-water.(i) What is the name given to the water in the compound copper sulphate-5-water?(ii) If copper sulphate-5-water is heated, the water is driven off leaving anhydrous copper sulphate. What is the colour of anhydrous copper sulphate?(iii) By what means, other than heating, can you dehydrate copper sulphate-5-water and obtain anhydrous copper sulphate?(iv) Which one of the salts in the given list is deliquescent? |
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Answer» Answer the questions below, relating your answers only to salts in the following list: sodium chloride, anhydrous calcium chloride, copper sulphate-5-water. (i) What is the name given to the water in the compound copper sulphate-5-water? (ii) If copper sulphate-5-water is heated, the water is driven off leaving anhydrous copper sulphate. What is the colour of anhydrous copper sulphate? (iii) By what means, other than heating, can you dehydrate copper sulphate-5-water and obtain anhydrous copper sulphate? (iv) Which one of the salts in the given list is deliquescent? |
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| 2317. |
Name two metals which are found in nature in the free state. |
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Answer» Name two metals which are found in nature in the free state. |
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| 2318. |
Nitrogen dioxide dissolves in atmospheric moisture or rainwater in the presence of oxygen to form _____. |
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Answer» Nitrogen dioxide dissolves in atmospheric moisture or rainwater in the presence of oxygen to form _____. |
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| 2319. |
The number of moles of H2SO4 required to completely neutralise 10 g of NaOH is:(Given molar mass of NaOH = 40 g/mole) |
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Answer» The number of moles of H2SO4 required to completely neutralise 10 g of NaOH is: (Given molar mass of NaOH = 40 g/mole) |
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| 2320. |
2 raised to 33 divided by 17 =?? |
| Answer» 2 raised to 33 divided by 17 =?? | |
| 2321. |
The chemical reaction: CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l); ∆H = -890.4kJ is |
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Answer» The chemical reaction: CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l); ∆H = -890.4kJ is |
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| 2322. |
1M aqueous solution of NaCl undergo electrolysis if 50 mA current is passed for 12 hours. Assume current efficiency is 25%.The total volume of gas produced at stp is |
| Answer» 1M aqueous solution of NaCl undergo electrolysis if 50 mA current is passed for 12 hours. Assume current efficiency is 25%.The total volume of gas produced at stp is | |
| 2323. |
What is amphoteric ? explain in detail with elements. |
| Answer» What is amphoteric ? explain in detail with elements. | |
| 2324. |
Which of the following is incorrect about nitrogen fixation in root nodule? |
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Answer» Which of the following is incorrect about nitrogen fixation in root nodule? |
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| 2325. |
42. Which one is a set of Isoelectronic species? a)N2,CO2,CN- b) N,H2S,CO c)N2,CO,CN- d) Ca,Mg,Cl |
| Answer» 42. Which one is a set of Isoelectronic species? a)N2,CO2,CN- b) N,H2S,CO c)N2,CO,CN- d) Ca,Mg,Cl | |
| 2326. |
When 5 moles of Fe2O3 are reduced with 6.5 gm of CO the moles of FeO formed are |
| Answer» When 5 moles of Fe2O3 are reduced with 6.5 gm of CO the moles of FeO formed are | |
| 2327. |
Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and 18 respectively. The elements which belong to the same period of the periodic table are : (a) A, B, C (b) B,C,D (c) A, D, E (d) B, D, E |
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Answer» Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and 18 respectively. The elements which belong to the same period of the periodic table are : (a) A, B, C (b) B,C,D (c) A, D, E (d) B, D, E |
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| 2328. |
Why is the alloy of Copper(60%), Zinc(20%), Nickel(20%) called 'German Silver'? |
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Answer» Why is the alloy of Copper(60%), Zinc(20%), Nickel(20%) called 'German Silver'? |
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| 2329. |
21. Differentiate meanings of calculation and determination of equivalent mass. |
| Answer» 21. Differentiate meanings of calculation and determination of equivalent mass. | |
| 2330. |
Question 47 A metal that exists as a liquid at room temperature is obtained by heating its sulphide in the presence of air. Identify the metal and its ore and give the reaction involved. |
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Answer» Question 47 A metal that exists as a liquid at room temperature is obtained by heating its sulphide in the presence of air. Identify the metal and its ore and give the reaction involved. |
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| 2331. |
Define conduction. What is thermal conductivity? |
| Answer» Define conduction. What is thermal conductivity? | |
| 2332. |
60.2g of gasA introduced in a evacuated flask at 25C. the pressure of the gas is 1atm. now 3g of another gasB is introducedin the same flask so total pressure becomes1.5atm.the ratio of molecular mass of A and B |
| Answer» 60.2g of gasA introduced in a evacuated flask at 25C. the pressure of the gas is 1atm. now 3g of another gasB is introducedin the same flask so total pressure becomes1.5atm.the ratio of molecular mass of A and B | |
| 2333. |
In the extraction of copper from your mine, we are now in the roasting phase. Broadly, what will be the components of the product that you get out of the reverberatory furnace? |
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Answer» In the extraction of copper from your mine, we are now in the roasting phase. Broadly, what will be the components of the product that you get out of the reverberatory furnace? |
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| 2334. |
CsBr crystallises in a body centred cubic lattice. Theunit cell length is 436.6 pm. Given that the atomicmass of Cs-133 and that of Br-80 amu andAvogadro number being 6.023 x 1023 mol-1 thedensity of CsBr is:(1) 42.5 g cm-3(3) 8.25 g cm 3(2) 0.425 g cm-3(4) 4.25 g cm-3 |
| Answer» CsBr crystallises in a body centred cubic lattice. Theunit cell length is 436.6 pm. Given that the atomicmass of Cs-133 and that of Br-80 amu andAvogadro number being 6.023 x 1023 mol-1 thedensity of CsBr is:(1) 42.5 g cm-3(3) 8.25 g cm 3(2) 0.425 g cm-3(4) 4.25 g cm-3 | |
| 2335. |
What happens when: (Write chemical reactions as well) (i) Sodium ethanoate is heated with soda lime. (ii) Ethanoic acid is warmed with methanol in the presence of concentrated sulphuric acid. |
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Answer» What happens when: (Write chemical reactions as well) |
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| 2336. |
Which one of the following can be used as an acid-base indicator by a visually impaired student? Justify your answer.(a) Litmus(b) Turmeric(c) Vanilla essence(d) Phenolphthalein |
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Answer» Which one of the following can be used as an acid-base indicator by a visually impaired student? Justify your answer. (a) Litmus (b) Turmeric (c) Vanilla essence (d) Phenolphthalein |
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| 2337. |
If drug for histamine stop acting the will acidity start again ? |
| Answer» If drug for histamine stop acting the will acidity start again ? | |
| 2338. |
What do you understand by amphoteric oxide? Give the balanced equations for the reaction with three different amphoteric oxides with a caustic alkali. Write your observation if any. |
| Answer» What do you understand by amphoteric oxide? Give the balanced equations for the reaction with three different amphoteric oxides with a caustic alkali. Write your observation if any. | |
| 2339. |
Name:(a) The metal which is liquid at room temperature.(b) The allotrope of the non-metal carbon which conducts electricity. |
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Answer» Name: (a) The metal which is liquid at room temperature. (b) The allotrope of the non-metal carbon which conducts electricity. |
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| 2340. |
What do you observe when ammonia hydroxide is added to the aqueous solution of : (a) FeSO4, (b) Iron (III) chloride, (c) Lead nitrate, (d) Zinc nitrate ? |
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Answer» What do you observe when ammonia hydroxide is added to the aqueous solution of : (a) FeSO4, (b) Iron (III) chloride, (c) Lead nitrate, (d) Zinc nitrate ? |
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| 2341. |
DESCRIBE THE REACTION3HCl+HNO3(OR)EXPLAIN THE REACTION IN AQUA-REGIA |
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Answer» DESCRIBE THE REACTION 3HCl+HNO3 (OR) EXPLAIN THE REACTION IN AQUA-REGIA |
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| 2342. |
Pure sulphuric acid is a ___ of electricity. |
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Answer» Pure sulphuric acid is a |
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| 2343. |
When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time. Why does this happen? Write the chemical equation. |
| Answer» When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time. Why does this happen? Write the chemical equation. | |
| 2344. |
What is Birch reduction? |
| Answer» What is Birch reduction? | |
| 2345. |
Which of the following reactions will not occur ? Why not? (a)MgSO4(aq)+Cu(s)⟶CuSO4(aq)+Mg(s) (b) CuSO4(aq)+Fe(s)⟶FeSO4(aq)+Cu(s) (c) MgSO4(aq)+Fe(s)⟶FeSO4(aq)+Mg(s) |
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Answer» Which of the following reactions will not occur ? Why not? |
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| 2346. |
A sample of ammonium phosphate contains 3.18 moles of hydrogen atom the no. Of moles of oxygen atom |
| Answer» A sample of ammonium phosphate contains 3.18 moles of hydrogen atom the no. Of moles of oxygen atom | |
| 2347. |
Why is the valency of lead 2 ,even though the valence electrons are 4? |
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Answer» Why is the valency of lead 2 ,even though the valence electrons are 4? |
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| 2348. |
63 Explain the nomenclatural difference between ether and ester |
| Answer» 63 Explain the nomenclatural difference between ether and ester | |
| 2349. |
Why solid NaCl does not conduct electricity? |
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Answer» Why solid NaCl does not conduct electricity? |
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| 2350. |
The method used for refining impure metals is called: |
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Answer» The method used for refining impure metals is called: |
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