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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.
| 5251. |
During the refining of an impure metal by electrolysis, the pure metal is a deposited: (a) at the cathode (b) On the walls of the electrolytic tank (c) at the anode (d) at the bottom of the electrolytic tank |
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Answer» During the refining of an impure metal by electrolysis, the pure metal is a deposited: |
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| 5252. |
On keeping iron nails in blue colour copper sulphate solution it is observed that the colour of the solution turns green after sometimes give reason for this colour change in the type of reaction |
| Answer» On keeping iron nails in blue colour copper sulphate solution it is observed that the colour of the solution turns green after sometimes give reason for this colour change in the type of reaction | |
| 5253. |
The chemical formula of brown ring formed in the brown ring test is . |
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Answer» The chemical formula of brown ring formed in the brown ring test is . |
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| 5254. |
A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Identify the compound and write its chemical formula. Write the chemical equation for its preparation. Mention any one use of the compound. |
| Answer» A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Identify the compound and write its chemical formula. Write the chemical equation for its preparation. Mention any one use of the compound. | |
| 5255. |
Which group of elements in the modern periodic table are referred as 'alkaline earth metals'? |
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Answer» Which group of elements in the modern periodic table are referred as 'alkaline earth metals'? |
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| 5256. |
Arrange the chain in proper sequence: Fish, crab, plankton, shark |
| Answer» Arrange the chain in proper sequence: Fish, crab, plankton, shark | |
| 5257. |
Mention the modern periodic law and describe in detail. |
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Answer» Mention the modern periodic law and describe in detail. |
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| 5258. |
A mixture of ethane and ethene occupies 41 L at 1 atm and 500k the mixture reacts completely with 10/3 moles of O2 to produced CO2 and H2O . The mole fraction of ethane and ethene in the mixture are ? |
| Answer» A mixture of ethane and ethene occupies 41 L at 1 atm and 500k the mixture reacts completely with 10/3 moles of O2 to produced CO2 and H2O . The mole fraction of ethane and ethene in the mixture are ? | |
| 5259. |
(a) Here is an electrode reaction:Cu → Cu2+ + 2e.At which electrode (anode or cathode) would such a reaction take place? Is this an example of oxidation?(b) A solution contains magnesium ions (Mg2+), iron (II) ions (Fe2+) and copper ions (Cu2+). On passing an electric current through this solution which ions will be the first to be discharged at the cathode? Write the equation for the cathode reaction.(c) Why is carbon tetrachloride, which is a liquid, a non-electrolyte? |
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Answer» (a) Here is an electrode reaction: Cu → Cu2+ + 2e. At which electrode (anode or cathode) would such a reaction take place? Is this an example of oxidation? (b) A solution contains magnesium ions (Mg2+), iron (II) ions (Fe2+) and copper ions (Cu2+). On passing an electric current through this solution which ions will be the first to be discharged at the cathode? Write the equation for the cathode reaction. (c) Why is carbon tetrachloride, which is a liquid, a non-electrolyte? |
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| 5260. |
A drop of oil is placed on the surface ofwater. Which of the following statementis correct?1.It will remain on it as a sphere 2.It will spread as a thin layer 3.It will be partly as spherical droplets andpartly as thin film 4.It will float as a distorted drop on thewater surfac |
| Answer» A drop of oil is placed on the surface ofwater. Which of the following statementis correct?1.It will remain on it as a sphere 2.It will spread as a thin layer 3.It will be partly as spherical droplets andpartly as thin film 4.It will float as a distorted drop on thewater surfac | |
| 5261. |
25.When one mole of N2 and one mole of H2 is enclosed in 3 litre vessel and the reaction is allowed to attain equilibrium it is found that at equilibrium there is X moles of H2 .the number of moles of NH3 formed would be |
| Answer» 25.When one mole of N2 and one mole of H2 is enclosed in 3 litre vessel and the reaction is allowed to attain equilibrium it is found that at equilibrium there is X moles of H2 .the number of moles of NH3 formed would be | |
| 5262. |
Represent in scientific notation:8008 |
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Answer» Represent in scientific notation: 8008 |
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| 5263. |
(a) What is an indicator ? Name the three common indicators. (b) Name an acid-base indicator extracted from lichen. (c) What colour does the turmeric paper turn to when put in an alkaline solution ? |
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Answer» (a) What is an indicator ? Name the three common indicators. (b) Name an acid-base indicator extracted from lichen. (c) What colour does the turmeric paper turn to when put in an alkaline solution ? |
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| 5264. |
State the observation when:(i) ethylene gas is bubbled through bromine water.(ii) a piece of sodium is dropped into ethyl alcohol.(iii) acetylene gas is burnt in air.(iv) an acidified solution of potassium dichromate is added to ethyl alcohol. |
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Answer» State the observation when: |
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| 5265. |
(a) Write equation for the reaction: Manganese and dilute nitric acid (b) Complete the equation: Lead monoxide +Nitric acid →______+______ [2 MARKS] |
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Answer» (a) Write equation for the reaction: Manganese and dilute nitric acid (b) Complete the equation: Lead monoxide +Nitric acid → |
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| 5266. |
Which of the following is position isomer of CH3−CH2−CH=CH2: |
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Answer» Which of the following is position isomer of |
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| 5267. |
Which of the following gases present in a polluted area will be adsorbed most easily on the charcoal gas mask ? |
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Answer» Which of the following gases present in a polluted area will be adsorbed most easily on the charcoal gas mask ? |
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| 5268. |
Difference between covalent radius and vander waals radius? |
| Answer» Difference between covalent radius and vander waals radius? | |
| 5269. |
The correct formula of oleum is : |
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Answer» The correct formula of oleum is : |
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| 5270. |
When a student heated a colourless solid compound, then brown fumes of a gas are evolved. The colourless solid is most likely to be :(1) ferrous sulphate(2) lead carbonate(3) lead nitrate(4) lead sulphate |
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Answer» When a student heated a colourless solid compound, then brown fumes of a gas are evolved. The colourless solid is most likely to be : (1) ferrous sulphate (2) lead carbonate (3) lead nitrate (4) lead sulphate |
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| 5271. |
How are the fourth electron in graphite which has double bond are delocalised and conducts electricity? |
| Answer» How are the fourth electron in graphite which has double bond are delocalised and conducts electricity? | |
| 5272. |
A housewife wanted her house to be whitewashed. She bought 10 kg of quicklime from the market and dissolved it in 30 litres of water. On adding quicklime to water she noticed that the water started boiling even when it was not being heated. Give reason for her observation. Write the corresponding chemical equation and name the product formed. |
| Answer» A housewife wanted her house to be whitewashed. She bought 10 kg of quicklime from the market and dissolved it in 30 litres of water. On adding quicklime to water she noticed that the water started boiling even when it was not being heated. Give reason for her observation. Write the corresponding chemical equation and name the product formed. | |
| 5273. |
Write down a food chain : (a) in the sea (b) which ends with humans (c) with five links in it. |
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Answer» Write down a food chain : (a) in the sea (b) which ends with humans (c) with five links in it. |
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| 5274. |
Which of the following property is not shown by covalent compounds? |
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Answer» Which of the following property is not shown by covalent compounds? |
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| 5275. |
The total number of hydrogen atoms present in two molecules of propyne is |
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Answer» The total number of hydrogen atoms present in two molecules of propyne is |
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| 5276. |
Ammonia molecule has one lone pair of electrons. It combines with hydroxyl ions of water to form ammonium ions through a coordinate bond. |
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Answer» Ammonia molecule has one lone pair of electrons. It combines with hydroxyl ions of water to form ammonium ions through a coordinate bond. |
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| 5277. |
The oxidation state of O in OF2 is |
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Answer» The oxidation state of O in OF2 is |
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| 5278. |
what is dalton law of partial pressure |
| Answer» what is dalton law of partial pressure | |
| 5279. |
What colour will universal indicator show if you add it to the following substances ? (a) potassium hydroxide, pH = 12 (b) soda water, pH = 5 (c) sulphuric acid, pH = 2 |
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Answer» What colour will universal indicator show if you add it to the following substances ? (a) potassium hydroxide, pH = 12 (b) soda water, pH = 5 (c) sulphuric acid, pH = 2 |
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| 5280. |
2 g of gas A introduced in a evacuated flask at 25^{†extdegree⊂}. The pressure of the gas is 1 atm. Now 3g of another gas B is introduced in the same flaskso total pressure becomes 1.5 atm. The ratio ofmolecular mass of A and B is |
| Answer» 2 g of gas A introduced in a evacuated flask at 25^{†extdegree⊂}. The pressure of the gas is 1 atm. Now 3g of another gas B is introduced in the same flaskso total pressure becomes 1.5 atm. The ratio ofmolecular mass of A and B is | |
| 5281. |
write about plasma and BEC state of matter in detail |
| Answer» write about plasma and BEC state of matter in detail | |
| 5282. |
Five atoms are labelled from A to E. AtomsMass NoAtomic No.A4020B199C73D168E147 Predict which are: (i) metals (ii) non-metals. |
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Answer» Five atoms are labelled from A to E. Predict which are: |
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| 5283. |
What is the reaction involved in Holmes signal? |
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Answer» What is the reaction involved in Holmes signal? |
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| 5284. |
5. In Which one of the Following Molecules the central Atom does not use vacant Orbital :- (1) Al2Cl6 (2) BeCl2(solid) (3) Si2H6 (4) B2H6 |
| Answer» 5. In Which one of the Following Molecules the central Atom does not use vacant Orbital :- (1) Al2Cl6 (2) BeCl2(solid) (3) Si2H6 (4) B2H6 | |
| 5285. |
Identify the correct order of the size of the following. |
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Answer» Identify the correct order of the size of the following. |
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| 5286. |
Why is ethylene an unsaturated hydrocarbon? |
| Answer» Why is ethylene an unsaturated hydrocarbon? | |
| 5287. |
The correct functional group X and the reagent/reaction conditions Y in the following scheme are (IIT-JEE, 2011) |
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Answer» The correct functional group X and the reagent/reaction conditions Y in the following scheme are |
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| 5288. |
What do we call the formula which gives us the relative arrangements of bonded atoms in a molecule? |
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Answer» What do we call the formula which gives us the relative arrangements of bonded atoms in a molecule? |
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| 5289. |
Many organic compounds are prepared using variety of methods. Which of the following organic compound is not obtained using destructive distillation of Coal |
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Answer» Many organic compounds are prepared using variety of methods. Which of the following organic compound is not obtained using destructive distillation of Coal |
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| 5290. |
From the list of characteristic given below select the five which are relevant to metals and their compounds.(1) ductile(2) conduct electricity.(3) Acidic oxide.(4) Discharged at anode.(5) Basic oxides.(6) Brittle.(7) (1, 2, 3) valence electrons.(8) Discharged at cathode.(9) (5, 6, 7) valence electrons.(10) Occurring in solid or gaseous state. |
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Answer» From the list of characteristic given below select the five which are relevant to metals and their compounds. (1) ductile (2) conduct electricity. (3) Acidic oxide. (4) Discharged at anode. (5) Basic oxides. (6) Brittle. (7) (1, 2, 3) valence electrons. (8) Discharged at cathode. (9) (5, 6, 7) valence electrons. (10) Occurring in solid or gaseous state. |
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| 5291. |
Question 12.One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is (a) hydrochloric acid(b) tartaric acid(c) acetic acid(d) sulphuric acid |
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Answer» Question 12. |
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| 5292. |
Explain why the lights of red colour are used for danger signals. |
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Answer» Explain why the lights of red colour are used for danger signals. |
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| 5293. |
Arrange single, double and triple bonds in decreasing order of their strengths. |
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Answer» Arrange single, double and triple bonds in decreasing order of their strengths. |
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| 5294. |
Among group 16 elements electron gain enthalpy of which is least negative?(1)O(2)S(3)Se(4)Te |
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Answer» Among group 16 elements electron gain enthalpy of which is least negative? (1)O (2)S (3)Se (4)Te |
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| 5295. |
An Arrhenius acid is a substance that gives ions in an aqueous solution. |
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Answer» An Arrhenius acid is a substance that gives |
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| 5296. |
The role of fluorspar (CaF2) which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite (Na3AlF6) is: |
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Answer» The role of fluorspar (CaF2) which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite (Na3AlF6) is: |
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| 5297. |
3 One mole gas occupying 3 litre volume is expended against a constant external pressure of one atm to a volume of 15 litre. The work done by the system is: (1)- (1) - 1.215 1000 j (2) +15 1000 j (3) +121.5 1000 j (4) 1.215 1000 j |
| Answer» 3 One mole gas occupying 3 litre volume is expended against a constant external pressure of one atm to a volume of 15 litre. The work done by the system is: (1)- (1) - 1.215 1000 j (2) +15 1000 j (3) +121.5 1000 j (4) 1.215 1000 j | |
| 5298. |
If progesterone maintains endometrium then why progesterone estrogen combination is given as oral pill to prevent pregnancy |
| Answer» If progesterone maintains endometrium then why progesterone estrogen combination is given as oral pill to prevent pregnancy | |
| 5299. |
38. How many isomers of C5H11 OH will be secondary alcohol |
| Answer» 38. How many isomers of C5H11 OH will be secondary alcohol | |
| 5300. |
Sugar in water is an example of __ (aqueous/non-aqueous) solution. |
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Answer» Sugar in water is an example of |
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