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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.
| 1301. |
Is it compulsory that all metal will lose electron and all non metal to gain electron?? |
| Answer» Is it compulsory that all metal will lose electron and all non metal to gain electron?? | |
| 1302. |
if we give pressure to gases why gases convert to liquid,actually what hapens to gases chemically and if we give pressure to gas it convert to liquid,can liquid convert to solid by applying pressur |
| Answer» if we give pressure to gases why gases convert to liquid,actually what hapens to gases chemically and if we give pressure to gas it convert to liquid,can liquid convert to solid by applying pressur | |
| 1303. |
What is electroplating? Mention some advantages of it. |
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Answer» What is electroplating? Mention some advantages of it. |
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| 1304. |
What is litmus solution? |
| Answer» What is litmus solution? | |
| 1305. |
a) What would happen if sodium and potassium are kept in open air? [2 MARKS] b) Which gas is used for extinguishing flames? How does it work? [3 MARKS] |
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Answer» a) What would happen if sodium and potassium are kept in open air? [2 MARKS] |
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| 1306. |
In order to obtain one tonne of aluminium, the following inputs are required:4 tonnes of bauxite, 150 kg of sodium hydroxide and 600 kg of graphite.The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (III) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.(a) When bauxite is treated with sodium hydroxide solution, what happens to:(i) the aluminium oxide?(ii) the iron (III) oxide?(b) (i) Name the process used for the purification of bauxite.(ii) Write the equation to show the action of heat on aluminium hydroxide.(c) (i) Write the formula of cryolite.(ii) Write down the word which correctly completes the following sentence:"By dissolving aluminium oxide in cryolite, a __________ (conducting/non-conducting) solution is produced.(iii) Why is so much graphite required for this electrolytic process?(iv) Write the equation for the reaction which takes place at the cathode.(d) In construction work, why is the alloy of aluminium, duralumin used rather than pure aluminium. |
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Answer» In order to obtain one tonne of aluminium, the following inputs are required: 4 tonnes of bauxite, 150 kg of sodium hydroxide and 600 kg of graphite. The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (III) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite. (a) When bauxite is treated with sodium hydroxide solution, what happens to: (i) the aluminium oxide? (ii) the iron (III) oxide? (b) (i) Name the process used for the purification of bauxite. (ii) Write the equation to show the action of heat on aluminium hydroxide. (c) (i) Write the formula of cryolite. (ii) Write down the word which correctly completes the following sentence: "By dissolving aluminium oxide in cryolite, a __________ (conducting/non-conducting) solution is produced. (iii) Why is so much graphite required for this electrolytic process? (iv) Write the equation for the reaction which takes place at the cathode. (d) In construction work, why is the alloy of aluminium, duralumin used rather than pure aluminium. |
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| 1307. |
66. In electrolysis of h2o what is oxidation no of oh-? |
| Answer» 66. In electrolysis of h2o what is oxidation no of oh-? | |
| 1308. |
Why and what is role of organic peroxide in preparing haloalkane from sulphuryl chloride and alkanes |
| Answer» Why and what is role of organic peroxide in preparing haloalkane from sulphuryl chloride and alkanes | |
| 1309. |
A compound X which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water : (a) Identify the compound X (b) Write the chemical equation for its preparation (c) For what purpose is it used in hospitals? |
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Answer» A compound X which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water : (a) Identify the compound X (b) Write the chemical equation for its preparation (c) For what purpose is it used in hospitals? |
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| 1310. |
Fill in the blanks.(i) The object to be electroplated is taken as ….……….. electrode.(ii)One of the most common applications of the chemical effect of electriccurrent is …………………….(iii)Small amount of mineral salt present naturally in water makes it a ………. ………………...of electricity.(iv) Electroplating of………………. is done on objects like water taps andcycle bell to give them a shiny appearance. |
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Answer» Fill in the blanks. (i) The object to be electroplated is taken as ….……….. electrode. |
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| 1311. |
A sample of ammonium phosphate contains 3.18 moles of hydrogen atoms the no.of moles of oxygen atoms in the sample is |
| Answer» A sample of ammonium phosphate contains 3.18 moles of hydrogen atoms the no.of moles of oxygen atoms in the sample is | |
| 1312. |
Carbon plays an important role in our life. Explain ( 6 points ) |
| Answer» Carbon plays an important role in our life. Explain ( 6 points ) | |
| 1313. |
How and why the mass of anode and cathode change during electrolysis? Please explain it thoroughly..... |
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Answer» How and why the mass of anode and cathode change during electrolysis? Please explain it thoroughly..... |
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| 1314. |
Bio-ethanol is widely used in____. |
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Answer» Bio-ethanol is widely used in____. |
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| 1315. |
Q By which conditions we define that these are highley reactive these are low reactive K>Ba>Na>Ca>Mg>Al>Zn>Cr>Fe>Cd>Co>Ni>Sn>Pb>H>Cu>Hg>Ag>Au>Pt and how they are defined to be in series |
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Answer» Q By which conditions we define that these are highley reactive these are low reactive K>Ba>Na>Ca>Mg>Al>Zn>Cr>Fe>Cd>Co>Ni>Sn>Pb>H>Cu>Hg>Ag>Au>Pt and how they are defined to be in series |
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| 1316. |
Which type of covalent bond is formed when six electrons are shared? |
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Answer» Which type of covalent bond is formed when six electrons are shared? |
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| 1317. |
Discuss briefly two physical and three chemical properties of ethanol. [5 MARKS] |
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Answer» Discuss briefly two physical and three chemical properties of ethanol. [5 MARKS] |
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| 1318. |
Choose the correct option given to distinguish between Zinc nitrate solution and Calcium nitrate solution |
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Answer» Choose the correct option given to distinguish between Zinc nitrate solution and Calcium nitrate solution |
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| 1319. |
(a) To carry out the so-called "electrolysis of water", sulphuric acid is added to water.How does the addition of sulphuric acid produce a conducting solution?(b) Copy and complete the following sentence:With platinum electrodes, hydrogen is liberated at the ________ and oxygen at the ________ during the electrolysis of acidified water. |
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Answer» (a) To carry out the so-called "electrolysis of water", sulphuric acid is added to water. How does the addition of sulphuric acid produce a conducting solution? (b) Copy and complete the following sentence: With platinum electrodes, hydrogen is liberated at the ________ and oxygen at the ________ during the electrolysis of acidified water. |
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| 1320. |
Calculate the percentage of phosphorus in the fertilizer superphosphate, Ca(H2PO4)2 (correct to 1 decimal place.) [Ca = 40, H = 1, P = 31, O = 16] |
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Answer» Calculate the percentage of phosphorus in the fertilizer superphosphate, Ca(H2PO4)2 (correct to 1 decimal place.) [Ca = 40, H = 1, P = 31, O = 16] |
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| 1321. |
31. Henrys constant for argon is 40k bar in water determine molal concentration of argon in water when it stored above water at 10 bar pressure |
| Answer» 31. Henrys constant for argon is 40k bar in water determine molal concentration of argon in water when it stored above water at 10 bar pressure | |
| 1322. |
Analyze the reaction given above and identify 'X' from the following options. CH3CH2OH(aq)+Xacid−−→CH3CH2COOCH2CH3(aq)+H2O(aq) |
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Answer» Analyze the reaction given above and identify 'X' from the following options. |
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| 1323. |
The valencies of aluminium and chlorine in the compound AlCl3 respectively are ______ and _____. |
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Answer» The valencies of aluminium and chlorine in the compound AlCl3 respectively are ______ and _____. |
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| 1324. |
When a strong acid and strong base react a neutral salt is formed. But what will happen if a weak acid and a weak base react, will the reaction take place? |
| Answer» When a strong acid and strong base react a neutral salt is formed. But what will happen if a weak acid and a weak base react, will the reaction take place? | |
| 1325. |
The equivalent conductivity of a solution containing 2.54 g of CuSO4 per litre is 91.0Ω−1cm2eq−1. Its conductivity would be: |
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Answer» The equivalent conductivity of a solution containing 2.54 g of CuSO4 per litre is 91.0Ω−1cm2eq−1. Its conductivity would be: |
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| 1326. |
14. The electrolyte having same value of Van't Hoff factor (i) as that of K3[Fe(CN)6] is |
| Answer» 14. The electrolyte having same value of Van't Hoff factor (i) as that of K3[Fe(CN)6] is | |
| 1327. |
Which will not give acetamide on reaction with ammonia (a) Acetic acid (b) Acetyl chloride (c) Acetic anhydride (d) Methyl formatek |
| Answer» Which will not give acetamide on reaction with ammonia (a) Acetic acid (b) Acetyl chloride (c) Acetic anhydride (d) Methyl formatek | |
| 1328. |
A to F below relate to the source and extraction of either zinc or aluminium.A. bauxiteB. cokeC. cryoliteD. froth flotationE. sodium hydroxide solutionF. zinc blende.(a) Write down the three letters each from the above list which are relevant to:(i) zinc(ii) aluminium(b) Fill in the blanks using the most appropriate words from A to F:(i) The ore from which aluminium is extracted must first be treated with _________ so that pure aluminium oxide can be obtained.(ii) Pure aluminium oxide is dissolved in _________ to make a conducting solution.(c) Write the formula of cryolite. |
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Answer» A to F below relate to the source and extraction of either zinc or aluminium. A. bauxite B. coke C. cryolite D. froth flotation E. sodium hydroxide solution F. zinc blende. (a) Write down the three letters each from the above list which are relevant to: (i) zinc (ii) aluminium (b) Fill in the blanks using the most appropriate words from A to F: (i) The ore from which aluminium is extracted must first be treated with _________ so that pure aluminium oxide can be obtained. (ii) Pure aluminium oxide is dissolved in _________ to make a conducting solution. (c) Write the formula of cryolite. |
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| 1329. |
Explain briefly about PH scale at 25°C? |
| Answer» Explain briefly about PH scale at 25°C? | |
| 1330. |
The number of 'σ' bonds in diborane are |
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Answer» The number of 'σ' bonds in diborane are |
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| 1331. |
Mol L-1 s-1 means |
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Answer» Mol L-1 s-1 means |
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| 1332. |
Write balanced chemical equation for the following:(i) Monochloro ethane is hydrolysed with aqueous KOH.(ii) A mixture of sodalime and sodium acetate is heated.(iii) Ethanol under high pressure and low temperature is treated with acidified potassium dichromate.(iv) Water is added to calcium carbide.(v) Ethanol reacts with sodium at room temperature. |
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Answer» Write balanced chemical equation for the following: (i) Monochloro ethane is hydrolysed with aqueous KOH. (ii) A mixture of sodalime and sodium acetate is heated. (iii) Ethanol under high pressure and low temperature is treated with acidified potassium dichromate. (iv) Water is added to calcium carbide. (v) Ethanol reacts with sodium at room temperature. |
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| 1333. |
Abnormal behaviour of fluorine is due to |
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Answer» Abnormal behaviour of fluorine is due to |
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| 1334. |
10. Can + e effect happened in compounds having double bond between dissimilar atoms |
| Answer» 10. Can + e effect happened in compounds having double bond between dissimilar atoms | |
| 1335. |
Calcium Phosphate in teeth is acidic or basic in nature? |
| Answer» Calcium Phosphate in teeth is acidic or basic in nature? | |
| 1336. |
The aqueous solution of the salt will be colored in the case of: |
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Answer» The aqueous solution of the salt will be colored in the case of: |
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| 1337. |
acidic strength in HClO HBrO HIO |
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Answer» acidic strength in HClO HBrO HIO |
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| 1338. |
The approximate value of 27∘C in Kelvin is___ |
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Answer» The approximate value of 27∘C in Kelvin is |
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| 1339. |
What do you understand by the term "electronic configuration" of an element? Write down the electronic configuration of oxygen (At. No. = 8).An element has an atomic number 12. How many electrons will be present in the K, L and M energy shells of its atom? |
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Answer» What do you understand by the term "electronic configuration" of an element? Write down the electronic configuration of oxygen (At. No. = 8). An element has an atomic number 12. How many electrons will be present in the K, L and M energy shells of its atom? |
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| 1340. |
48. How to write the structural formula for propene |
| Answer» 48. How to write the structural formula for propene | |
| 1341. |
The density of gas A is twice that of gas B at the same temperature. The molecular weight of gas B is thrice that of A. The ratio of pressure acting on A and B will be (1) 6:1 (2) 7:8 (3) 2:5 (4) 1:4 |
| Answer» The density of gas A is twice that of gas B at the same temperature. The molecular weight of gas B is thrice that of A. The ratio of pressure acting on A and B will be (1) 6:1 (2) 7:8 (3) 2:5 (4) 1:4 | |
| 1342. |
how electricity is produced by a redox reaction in a leclanche cell? |
| Answer» how electricity is produced by a redox reaction in a leclanche cell? | |
| 1343. |
Which among the following metals will get corroded at the fastest rate on exposure to air and water is? |
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Answer» Which among the following metals will get corroded at the fastest rate on exposure to air and water is? |
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| 1344. |
13 a gaseous reaction, A2(g)-----B(g)+1/2C(g) shows increase in pressure from 100mm to 120mm in 5 minutes.The rate of disappearance of A2 is- |
| Answer» 13 a gaseous reaction, A2(g)-----B(g)+1/2C(g) shows increase in pressure from 100mm to 120mm in 5 minutes.The rate of disappearance of A2 is- | |
| 1345. |
Write down two uses of hydrogen and chlorine gas. |
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Answer» Write down two uses of hydrogen and chlorine gas. |
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| 1346. |
Fill in the blanks:(i) Aqua-regia is a mixture of _________.(ii) A constant boiling mixture of water and hydrochloric acid is also called as _________.(iii) ________ agent converts hydrochloric acid to chlorine.(iv) Hydrogen and chlorine reacts in presence of _________ to form hydrogen chloride.(v) On addition of silver nitrate to hydrochloric acid ________ precipitate is formed which is soluble in __________.(vi) The white precipitate of lead chloride is soluble in __________. |
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Answer» Fill in the blanks: |
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| 1347. |
Three different electrolytic cells A, B and C are connected in separate circuits. Electrolytic cell A contains sodium chloride solution. When the circuit is completed a bulb in the circuit glows brightly. Electrolytic cell B contains acetic acid solution and in this case the bulb in the circuit glows dimly. The electrolytic cell C contains sugar solution and the bulb does not glow. Give a reason for each of these observations. |
| Answer» Three different electrolytic cells A, B and C are connected in separate circuits. Electrolytic cell A contains sodium chloride solution. When the circuit is completed a bulb in the circuit glows brightly. Electrolytic cell B contains acetic acid solution and in this case the bulb in the circuit glows dimly. The electrolytic cell C contains sugar solution and the bulb does not glow. Give a reason for each of these observations. | |
| 1348. |
Describe in each case, one chemical test that would enable you to distinguish between the following pairs of chemicals. Describe what happens with each chemical or state 'no visible reaction'.(i) Sodium chloride solution and sodium nitrate solution.(ii) Sodium sulphate solution and sodium chloride solution.(iii) Calcium nitrate solution and zinc nitrate solution. |
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Answer» Describe in each case, one chemical test that would enable you to distinguish between the following pairs of chemicals. Describe what happens with each chemical or state 'no visible reaction'. (i) Sodium chloride solution and sodium nitrate solution. (ii) Sodium sulphate solution and sodium chloride solution. (iii) Calcium nitrate solution and zinc nitrate solution. |
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| 1349. |
Dear sir /ma'am, The solubility of sodium fluoride, NaF, in water at 25 degree Celsius is 4.100g per 100.0g of water. Assume 100.0g of water occupies a volume of 100.0ml.A saturated solution is prepared by adding 6.000gof NaF to 100.0ml of water at 25 degree Celsius in a beaker and steering thoroughly. The following sequence of steps is carried out : Step 1:50.0ml of solution is removed from the beaker and discarded. Step 2:50.0ml of water is added to the beaker and steered. Step 3:50.0ml of solution is Removed from the beaker and discarded. The maximum mass of NaF now remaining and recoverable from the beaker is? Options: A) 1.025g B) 1.900g C) 1.975g D) 4.100g Please help me to solve it. |
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Answer» Dear sir /ma'am, The solubility of sodium fluoride, NaF, in water at 25 degree Celsius is 4.100g per 100.0g of water. Assume 100.0g of water occupies a volume of 100.0ml.A saturated solution is prepared by adding 6.000gof NaF to 100.0ml of water at 25 degree Celsius in a beaker and steering thoroughly. The following sequence of steps is carried out : Step 1:50.0ml of solution is removed from the beaker and discarded. Step 2:50.0ml of water is added to the beaker and steered. Step 3:50.0ml of solution is Removed from the beaker and discarded. The maximum mass of NaF now remaining and recoverable from the beaker is? Options: A) 1.025g B) 1.900g C) 1.975g D) 4.100g Please help me to solve it. |
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| 1350. |
What is the difference between baking powder and baking soda ? |
| Answer» What is the difference between baking powder and baking soda ? | |