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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.
| 2351. |
Why is the energy of an electron in a hydrogen atom taken negative? |
| Answer» Why is the energy of an electron in a hydrogen atom taken negative? | |
| 2352. |
The major phenomenon behind liquefaction is ___ |
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Answer» The major phenomenon behind liquefaction is |
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| 2353. |
Who coined the term atom? |
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Answer» Who coined the term atom? |
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| 2354. |
3 why the enthalpy of formation of alkaline earth metal oxide is high |
| Answer» 3 why the enthalpy of formation of alkaline earth metal oxide is high | |
| 2355. |
Question 15Shyam was cooking potato curry on a chulha. To his surprise, he observed that the copper vessel was getting blackened from outside. It may be due to:(a) proper combustion of fuel(b) improper cooking of potato curry.(c) improper combustion of the fuel.(d) burning of copper vessel. |
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Answer» Question 15 Shyam was cooking potato curry on a chulha. To his surprise, he observed that the copper vessel was getting blackened from outside. It may be due to: (a) proper combustion of fuel (b) improper cooking of potato curry. (c) improper combustion of the fuel. (d) burning of copper vessel. |
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| 2356. |
68. which one has same vont hoff factor i as that of Hg_2Cl_2? 1. NaCl 2. Na_2SO_4 3. Al(NO_3)_3 4. Al_2(SO_4)_3 |
| Answer» 68. which one has same vont hoff factor i as that of Hg_2Cl_2? 1. NaCl 2. Na_2SO_4 3. Al(NO_3)_3 4. Al_2(SO_4)_3 | |
| 2357. |
Which of the following is correct with respect to calorific value? |
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Answer» Which of the following is correct with respect to calorific value? |
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| 2358. |
Carbon dioxide is prepared by complete combustion of carbon and carbon-containing fuels in _________ of air. |
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Answer» Carbon dioxide is prepared by complete combustion of carbon and carbon-containing fuels in _________ of air. |
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| 2359. |
When potassium permanganate is heated it produces potassium manganate, manganese dioxide and oxygen gas. This is an example of ______ reaction. |
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Answer» When potassium permanganate is heated it produces potassium manganate, manganese dioxide and oxygen gas. This is an example of ______ reaction. |
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| 2360. |
State two uses of polythene. |
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Answer» State two uses of polythene. |
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| 2361. |
Which of the following reactions involves the combination of two elements? |
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Answer» Which of the following reactions involves the combination of two elements? |
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| 2362. |
When SO2 is passed in acidified K2CR2O7 solution oxidation state of S changed from |
| Answer» When SO2 is passed in acidified K2CR2O7 solution oxidation state of S changed from | |
| 2363. |
Question 1Give the names of two energy sources that you would consider to be exhaustible. Give reasons for your choices. |
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Answer» Question 1 Give the names of two energy sources that you would consider to be exhaustible. Give reasons for your choices. |
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| 2364. |
a uniform rope of linear mass density lembda and lenght is placed on a smooth table if suspendedlenght is25%then work done to pullthe chain on the table i |
| Answer» a uniform rope of linear mass density lembda and lenght is placed on a smooth table if suspendedlenght is25%then work done to pullthe chain on the table i | |
| 2365. |
Question 4 (ii)How many atoms are present in a:(ii) PO3−4ion |
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Answer» Question 4 (ii) How many atoms are present in a: (ii) PO3−4ion |
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| 2366. |
The chemical formula of refrigerant R - 113 is |
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Answer» The chemical formula of refrigerant R - 113 is |
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| 2367. |
What is the primary source of energy behind the chemical energy stored in fossil fuels? |
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Answer» What is the primary source of energy behind the chemical energy stored in fossil fuels? |
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| 2368. |
According to bohr's theory possible value of angular momentum of an electron orbiting in hydrogen atom is |
| Answer» According to bohr's theory possible value of angular momentum of an electron orbiting in hydrogen atom is | |
| 2369. |
Do all molecules of liquid take part in evaporation?Explain. |
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Answer» Do all molecules of liquid take part in evaporation?Explain. |
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| 2370. |
How does carbon dioxide cause global warming? |
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Answer» How does carbon dioxide cause global warming? |
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| 2371. |
in discharge tube experiment for anode rays why we use perforated metal? |
| Answer» in discharge tube experiment for anode rays why we use perforated metal? | |
| 2372. |
In which part of India was the first oil reserve discovered? |
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Answer» In which part of India was the first oil reserve discovered? |
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| 2373. |
A metal was burnt in air. The Substance formed was dissolved in water and tested with blue and red litmus paper. What result do you expect? |
| Answer» A metal was burnt in air. The Substance formed was dissolved in water and tested with blue and red litmus paper. What result do you expect? | |
| 2374. |
Fill in the blanks.(a) If the valency of carbon is 4 and that of hydrogen is 1 then the molecular formula of methane is ………… .(b) The gas Helium, is chemically ………… .(c) There are two electrons in the outermost orbit of the magnesium atom. Hence, the valency of magnesium is ………… .(d) and ………… are isotopes of chlorine.(e) Isotopes of uranium are used as ………… in atomic reactors. |
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Answer» Fill in the blanks. (a) If the valency of carbon is 4 and that of hydrogen is 1 then the molecular formula of methane is ………… . (b) The gas Helium, is chemically ………… . (c) There are two electrons in the outermost orbit of the magnesium atom. Hence, the valency of magnesium is ………… . (d) (e) Isotopes of uranium are used as ………… in atomic reactors.
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| 2375. |
Write a note on global warming. |
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Answer» Write a note on global warming. |
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| 2376. |
What is lithium in electrostatic force? |
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Answer» What is lithium in electrostatic force? |
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| 2377. |
What volume of oxygen gas (O,) measured at 0Cand 1 atm, is needed to burn completely 1 L ofpropane gas (C Ha) measured under the sameconditions? |
| Answer» What volume of oxygen gas (O,) measured at 0Cand 1 atm, is needed to burn completely 1 L ofpropane gas (C Ha) measured under the sameconditions? | |
| 2378. |
Question 24 Look at Fig. 5.1 where petroleum and natural gas deposits are shown. Why do we find oil layer above water layer? |
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Answer» Question 24 Look at Fig. 5.1 where petroleum and natural gas deposits are shown. Why do we find oil layer above water layer? 
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| 2379. |
Write the cations and anions present (if any) in the following compounds(a) CH3COONa(b) NaCl(c) H2(d) NH4NO3 |
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Answer» Write the cations and anions present (if any) in the following compounds (a) CH3COONa (b) NaCl (c) H2 (d) NH4NO3 |
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| 2380. |
By buying a rechargeable battery, we are supporting _____________ of waste. |
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Answer» By buying a rechargeable battery, we are supporting _____________ of waste. |
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| 2381. |
19. Solution is homogeneous.but why colloid and suspension are heterogeneous? |
| Answer» 19. Solution is homogeneous.but why colloid and suspension are heterogeneous? | |
| 2382. |
What is hybridization and geometry of [Cu(NH3)6]+2 ? |
| Answer» What is hybridization and geometry of [Cu(NH3)6]+2 ? | |
| 2383. |
at any temperature 'T'(>boiling point of water) for combustion of propane ∆E-∆H will be |
| Answer» at any temperature 'T'(>boiling point of water) for combustion of propane ∆E-∆H will be | |
| 2384. |
what is mass spectrography? |
| Answer» what is mass spectrography? | |
| 2385. |
Details about - Buna s rubber , and Nylon 610 |
| Answer» Details about - Buna s rubber , and Nylon 610 | |
| 2386. |
What is an ionic compounds? |
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Answer» What is an ionic compounds? |
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| 2387. |
16.What must be the charge on each of two 100 kg spherical masses in order for the electrical force to be equal to the gravitational force? |
| Answer» 16.What must be the charge on each of two 100 kg spherical masses in order for the electrical force to be equal to the gravitational force? | |
| 2388. |
Which of the following is/are correct regarding a Chemical Reaction? |
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Answer» Which of the following is/are correct regarding a Chemical Reaction? |
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| 2389. |
In anodising process, which metal is coated with its oxide to prevent corrosion? |
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Answer» In anodising process, which metal is coated with its oxide to prevent corrosion? |
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| 2390. |
How is valency helpful in writing chemical formula? Which one of the following is correct? |
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Answer» How is valency helpful in writing chemical formula? Which one of the following is correct? |
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| 2391. |
13. If activation energy of a backward reaction is -20 kJ/mol and that of forward reaction is 40kJ/mol, then enthalpy change for the reaction is 1. 20kJ/mol 2. 60kJ/mol 3. -20kJ/mol 4. -60kJ/mol Kindly explain with graph |
| Answer» 13. If activation energy of a backward reaction is -20 kJ/mol and that of forward reaction is 40kJ/mol, then enthalpy change for the reaction is 1. 20kJ/mol 2. 60kJ/mol 3. -20kJ/mol 4. -60kJ/mol Kindly explain with graph | |
| 2392. |
______ should not be used for extinguishing fire caused by an electric short-circuit. |
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Answer» ______ should not be used for extinguishing fire caused by an electric short-circuit. |
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| 2393. |
Two metallic oxides contain 27.6 percent and 30percent oxygen respectively .If the formula of the first oxide is X3O4, that of the second will be XO, XO2, X2O5, X2O3 |
| Answer» Two metallic oxides contain 27.6 percent and 30percent oxygen respectively .If the formula of the first oxide is X3O4, that of the second will be XO, XO2, X2O5, X2O3 | |
| 2394. |
18. The solubility product of BaCrO4 is 3.6 109 Its solubility is :- (1) 6 104 M (2) 3.6 105 M (3) 6 106 M (4) none of these |
| Answer» 18. The solubility product of BaCrO4 is 3.6 109 Its solubility is :- (1) 6 104 M (2) 3.6 105 M (3) 6 106 M (4) none of these | |
| 2395. |
What happens when a metallic oxide reacts with non metallic oxide? Give an example |
| Answer» What happens when a metallic oxide reacts with non metallic oxide? Give an example | |
| 2396. |
Write the common name and formula of the following substances - Sodium carbonate decahydrate Hydrated potassium aluminium sulphate Hydrated calcium sulphate |
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Answer» Write the common name and formula of the following substances -
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| 2397. |
Complete the following reaction: NaOH+Al→Na[Al(OH)4]+ |
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Answer» Complete the following reaction: NaOH+Al→Na[Al(OH)4]+ |
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| 2398. |
Which of the following metals do not react with oxygen? |
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Answer» Which of the following metals do not react with oxygen? |
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| 2399. |
15.What is the number of electrons in a subshell with l=5 ? 1. 5 2. 7 3. 9 4. 18 |
| Answer» 15.What is the number of electrons in a subshell with l=5 ? 1. 5 2. 7 3. 9 4. 18 | |
| 2400. |
Water contamination leads to death of aquatic species because ___ . |
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Answer» Water contamination leads to death of aquatic species because |
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and ………… are isotopes of chlorine.