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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.
| 2351. |
To prevent tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is- |
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Answer» To prevent tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is- |
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| 2352. |
Give an example to illustrate that metallic oxides are generally basic in nature. |
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Answer» Give an example to illustrate that metallic oxides are generally basic in nature. |
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| 2353. |
Ethyl chloride on heating with silver cyanide forms C2H5NC. Why is the product not C2H5CN? |
| Answer» Ethyl chloride on heating with silver cyanide forms C2H5NC. Why is the product not C2H5CN? | |
| 2354. |
Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride. |
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Answer» Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride. |
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| 2355. |
Write any three physical properties of bases? With effect on 3 indicators. [5 MARKS] |
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Answer» Write any three physical properties of bases? With effect on 3 indicators. [5 MARKS] |
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| 2356. |
Write equations to show the reaction between the following:(i) copper and concentrated nitric acid(ii) copper oxide and dilute nitric acid |
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Answer» Write equations to show the reaction between the following: (i) copper and concentrated nitric acid (ii) copper oxide and dilute nitric acid |
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| 2357. |
The correct stability order of the following resonating structures is: (I)H2C=+N=−N (II)H2 +C−N=−N (III)H2 −C−+N≡N (IV)H2−C−N=+N |
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Answer» The correct stability order of the following resonating structures is: (I)H2C=+N=−N (II)H2 +C−N=−N (III)H2 −C−+N≡N (IV)H2−C−N=+N |
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| 2358. |
Derive an expression for density of a cubic crystal from the edge of the cubic crystal of an element in terms of S.I. units .? |
| Answer» Derive an expression for density of a cubic crystal from the edge of the cubic crystal of an element in terms of S.I. units .? | |
| 2359. |
46. Why is sigma stronger than pi bond. |
| Answer» 46. Why is sigma stronger than pi bond. | |
| 2360. |
Identify the salt whose aqueous solution will have pH more than 7. |
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Answer» Identify the salt whose aqueous solution will have pH more than 7. |
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| 2361. |
Is ammonia denser than air? Which property of ammonia is demonstrated by the Fountain experiment? Write the balanced equation for the reaction between ammonia and sulphuric acid. |
| Answer» Is ammonia denser than air? Which property of ammonia is demonstrated by the Fountain experiment? Write the balanced equation for the reaction between ammonia and sulphuric acid. | |
| 2362. |
Name the carboxylic acids present in Acid Acid Tamarind Milk Butter Orange Roots of plant valerum Red ants lemon Honey bee |
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Answer» Name the carboxylic acids present in
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| 2363. |
Answer the following:(1) How do metal carbonates react with acids?(2) Explain in detail about hydronium ion.(3) What is universal indicator? Does Mg(OH)2 react with sodium hydroxide? If not, why?(4) State applications of baking soda. |
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Answer» Answer the following: (1) How do metal carbonates react with acids? (2) Explain in detail about hydronium ion. (3) What is universal indicator? Does Mg(OH)2 react with sodium hydroxide? If not, why? (4) State applications of baking soda. |
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| 2364. |
Define the following terms:(i) Constant boiling mixture(ii) Hygroscopic substance(iii) Oleum(iv) Dehydrating agent. |
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Answer» Define the following terms: |
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| 2365. |
The isomerism exhibited by the given compounds below is |
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Answer» The isomerism exhibited by the given compounds below is
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| 2366. |
An amount of 2 moles of KClO3 is decomposed completely to produce O2 gas, How many moles of butene C4H8 can be burnt completely by the O2 gas produced? |
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Answer» An amount of 2 moles of KClO3 is decomposed completely to produce O2 gas, How many moles of butene C4H8 can be burnt completely by the O2 gas produced? |
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| 2367. |
How to calculate total mass in a reaction? |
| Answer» How to calculate total mass in a reaction? | |
| 2368. |
Melting point increase upto arsenic and then decreases |
| Answer» Melting point increase upto arsenic and then decreases | |
| 2369. |
Why a P-P axial bond is stronger than S-S bond? |
| Answer» Why a P-P axial bond is stronger than S-S bond? | |
| 2370. |
30. Zn rod is placed in 100ml of 1m cuso4 solution so that molarity of cu2+ changes to 0.7 m . The molarity of SO4 2- at this stage will be |
| Answer» 30. Zn rod is placed in 100ml of 1m cuso4 solution so that molarity of cu2+ changes to 0.7 m . The molarity of SO4 2- at this stage will be | |
| 2371. |
4 moles of H2 react with 2 moles of O2 then 4 moles of H2O is formed . What is the limiting reagent and how? |
| Answer» 4 moles of H2 react with 2 moles of O2 then 4 moles of H2O is formed . What is the limiting reagent and how? | |
| 2372. |
(a) Name the alkali metals.How many electrons(s) do they have in their outermost orbit. (b) Take any one alkali metal and write its reaction with (i) oxygen (ii) water (iii) acid. |
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Answer» (a) Name the alkali metals.How many electrons(s) do they have in their outermost orbit. (b) Take any one alkali metal and write its reaction with (i) oxygen (ii) water (iii) acid. |
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| 2373. |
Explain the reason why:(i) HCl gas fumes in moist air.(ii) Dilute HCl cannot be concentrated beyond 22.2% by distillation.(iii) Dilute acids are stronger electrolytes as compared to concentrated acid.(iv) Liquid ammonia has no action on litmus while liquor ammonia has an effect.(v) Ammonia is not collected over water.(vi) Pure nitric acid does not dissolve gold or platinum, but aqua regia dissolves them. |
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Answer» Explain the reason why: |
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| 2374. |
The no of hydrogen ions in 10 ml of a solution with pH=13 i |
| Answer» The no of hydrogen ions in 10 ml of a solution with pH=13 i | |
| 2375. |
In the fountain experiment to demonstrate the high solubility of HCl gas in water, dry HCl gas is filled in the round bottomed flask. Give reasons |
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Answer» In the fountain experiment to demonstrate the high solubility of HCl gas in water, dry HCl gas is filled in the round bottomed flask. Give reasons |
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| 2376. |
What would be the number of periods and groups if each atomic orbital could contain Max 3 electron assuming that there are 104 elements in modern periodic table ? |
| Answer» What would be the number of periods and groups if each atomic orbital could contain Max 3 electron assuming that there are 104 elements in modern periodic table ? | |
| 2377. |
A unit cell of diamond consists of(a) 6 units(c) 8 units(b) 4 units(d) 10 units. |
| Answer» A unit cell of diamond consists of(a) 6 units(c) 8 units(b) 4 units(d) 10 units. | |
| 2378. |
5.The number of moles of ferrous oxalate oxidised by one mole of kmno4 in acidic medium is a.5/3 b.3/5 c.6/5 d.1/5 |
| Answer» 5.The number of moles of ferrous oxalate oxidised by one mole of kmno4 in acidic medium is a.5/3 b.3/5 c.6/5 d.1/5 | |
| 2379. |
21. Calculate the ph of 0.1M solution of acetic acid if the degree of dissociation of acid is 0.0132 |
| Answer» 21. Calculate the ph of 0.1M solution of acetic acid if the degree of dissociation of acid is 0.0132 | |
| 2380. |
7.What is the differences between smelting and bessemerisation process of copper |
| Answer» 7.What is the differences between smelting and bessemerisation process of copper | |
| 2381. |
What is relative mass |
| Answer» What is relative mass | |
| 2382. |
Vapour Density = a:b where 'a' is: |
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Answer» Vapour Density = a:b where 'a' is: |
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| 2383. |
An element E exists in three allotropic forms A, B and C. In allotrope A, the atoms of element E are joined to form spherical molecules. In allotrope B, each atom of element E is surrounded by three other E atoms to form a sheet-like structure. In allotrope C, each atom of element E is surrounded by four other E atoms to form a rigid structure. (a) Name the element E. (b) What is allotrope A? (c) What is allotrope B? (d) What is allotrope C? (e) Which allotrope is used in making jewellery? (f) Which allotrope is used in making the anode of a dry cell? |
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Answer» An element E exists in three allotropic forms A, B and C. In allotrope A, the atoms of element E are joined to form spherical molecules. In allotrope B, each atom of element E is surrounded by three other E atoms to form a sheet-like structure. In allotrope C, each atom of element E is surrounded by four other E atoms to form a rigid structure. |
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| 2384. |
is it necessary to learn the derivation of all the formulas ? for eg. to find apparent depth ? |
| Answer» is it necessary to learn the derivation of all the formulas ? for eg. to find apparent depth ? | |
| 2385. |
Q. Calcium carbonate reacts with aqueous HCL to give Calcium chloride and carbon dioxide ,according to the reaction CaCo3(s)+2HCl(aq) →CaCl2(aq)+CO2(g)+H2O(l)What mass of calcium carbonate is required to react completely with 25 ml of 0.75M HCL |
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Answer» Q. Calcium carbonate reacts with aqueous HCL to give Calcium chloride and carbon dioxide ,according to the reaction CaCo3(s)+2HCl(aq) →CaCl2(aq)+CO2(g)+H2O(l) What mass of calcium carbonate is required to react completely with 25 ml of 0.75M HCL |
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| 2386. |
What is the composition of stainless steed? |
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Answer» What is the composition of stainless steed? |
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| 2387. |
Question 5:Write the uses of acids? |
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Answer» Question 5: Write the uses of acids? |
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| 2388. |
When SO2 reacts with potassium dichromate, the color of the solution changes to |
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Answer» When SO2 reacts with potassium dichromate, the color of the solution changes to |
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| 2389. |
Match the following petroleum by-products and the number of carbon atoms present in them. Petroleum productNumber of carbon atoms presentUncondensed gases1 to 4Diesel5 to 9Paraffin wax10 to 16Petrol16 to 18Kerosene22 to 30 |
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Answer» Match the following petroleum by-products and the number of carbon atoms present in them. Petroleum productNumber of carbon atoms presentUncondensed gases1 to 4Diesel5 to 9Paraffin wax10 to 16Petrol16 to 18Kerosene22 to 30 |
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| 2390. |
Write the laboratory preparation method of hydrogen gas. |
| Answer» Write the laboratory preparation method of hydrogen gas. | |
| 2391. |
What is double displacement reaction. Give an example. |
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Answer» What is double displacement reaction. Give an example. |
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| 2392. |
17. CO2 is a gas while SiO2 is a solid but both are (1) covalent containg pi bond (2) molecules having p pi-d pi bonding (3) acidic (4) discrete molecules |
| Answer» 17. CO2 is a gas while SiO2 is a solid but both are (1) covalent containg pi bond (2) molecules having p pi-d pi bonding (3) acidic (4) discrete molecules | |
| 2393. |
Molecular attraction is strongest in? |
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Answer» Molecular attraction is strongest in? |
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| 2394. |
Law of octaves |
| Answer» Law of octaves | |
| 2395. |
Whathappens when haloalkanes react with metals like iron |
| Answer» Whathappens when haloalkanes react with metals like iron | |
| 2396. |
On heating potassium permangante, one of the following compound is not obtained. |
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Answer» On heating potassium permangante, one of the following compound is not obtained. |
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| 2397. |
(a) Calculate the empirical formula of the compound having 37.6% sodium, 23.1% silicon and 39.3% oxygen (O = 16; Na = 23; Si = 28).(b) The empirical formula of a compound is C2H5. It has a vapour density of 29. Determine the relative molecular mass of the compound and hence its molecular formula. |
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Answer» (a) Calculate the empirical formula of the compound having 37.6% sodium, 23.1% silicon and 39.3% oxygen (O = 16; Na = 23; Si = 28). |
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| 2398. |
When an ionic bond forms, eg Na and Cl, one electron is transferred to chlorine by sodium. It forms one positive ion Na+ and negative ion Cl-. But what happens to protons of both these elements, and no of proton and electron should be equal, now sodium has only 10 electron but 11 protons and chlorine has 10 electron but 9 protons ??? Didn't atoms need to be as a whole neutral? |
| Answer» When an ionic bond forms, eg Na and Cl, one electron is transferred to chlorine by sodium. It forms one positive ion Na+ and negative ion Cl-. But what happens to protons of both these elements, and no of proton and electron should be equal, now sodium has only 10 electron but 11 protons and chlorine has 10 electron but 9 protons ??? Didn't atoms need to be as a whole neutral? | |
| 2399. |
Q 68/75 Calculate the volume of water to be added to 400 ml ofseminormal HCI solution to make it decinormal |
| Answer» Q 68/75 Calculate the volume of water to be added to 400 ml ofseminormal HCI solution to make it decinormal | |
| 2400. |
The term used to indicate the development of unpleasant smell and taste in fat and oil containing foods due to aerial oxidation is : (a) acidity (b) radioactivity (c) rabidity (d) rancidity |
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Answer» The term used to indicate the development of unpleasant smell and taste in fat and oil containing foods due to aerial oxidation is : (a) acidity (b) radioactivity (c) rabidity (d) rancidity |
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