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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.
| 14351. |
Hydrogen sulphide gas burns in oxygen to yield 12.8 g of sulphur dioxide gas as under: 2H2S + 3O2 → 2H2O + 2SO2 (i). calculate the volume of hydrogen suulphide at STP. Also, (ii). calculate the volume of oxygen required at STP. Which will complete the combustion of hydrogen sulphide determined in litres. |
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Answer» Hydrogen sulphide gas burns in oxygen to yield 12.8 g of sulphur dioxide gas as under: |
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| 14352. |
The bond angle in PH3 would be expected to be close to: |
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Answer» The bond angle in PH3 would be expected to be close to: |
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| 14353. |
Explain the compound diethyl ether. |
| Answer» Explain the compound diethyl ether. | |
| 14354. |
Which gas is released when iron reacts with conc nitric acid? |
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Answer» Which gas is released when iron reacts with conc nitric acid? |
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| 14355. |
(a) in Contact process, sulphur dioxide can be oxidised to sulphur trioxide in the presence of platinised asbestos which acts as a catalyst. The reaction is exothermic. Explain what is meant by the terms in Italics. (b) Give examples of the use of sulphuric acid. (i) As an electrolyte In everyday use. (ii) As non-volatile acid. (iii) As an oxidising agent. [5 MARKS] |
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Answer» (a) in Contact process, sulphur dioxide can be oxidised to sulphur trioxide in the presence of platinised asbestos which acts as a catalyst. The reaction is exothermic. Explain what is meant by the terms in Italics. (b) Give examples of the use of sulphuric acid. (i) As an electrolyte In everyday use. (ii) As non-volatile acid. (iii) As an oxidising agent. [5 MARKS] |
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| 14356. |
Which of the following formula represents alkenes? |
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Answer» Which of the following formula represents alkenes? |
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| 14357. |
Question 26 Which of the following set of elements is written in order of their increasing metallic character? (a) Be, Mg, Ca (b) Na, Li, K (c) Mg, Al, Si (d) C, O, N |
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Answer» Question 26 Which of the following set of elements is written in order of their increasing metallic character? (a) Be, Mg, Ca (b) Na, Li, K (c) Mg, Al, Si (d) C, O, N |
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| 14358. |
The following reaction is an example of 4NH3 + 5O2 -------> 4NO + 6H2O (1) displacement reaction (2) combustion reaction (3) redox reaction (4) neutralisation reaction (A) 1 and 2 (B) 2 and 3 (C) 3 and 4 (D) 1 and 4 |
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Answer» The following reaction is an example of 4NH3 + 5O2 -------> 4NO + 6H2O (1) displacement reaction (2) combustion reaction (3) redox reaction (4) neutralisation reaction (A) 1 and 2 (B) 2 and 3 (C) 3 and 4 (D) 1 and 4 |
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| 14359. |
An atom X has three electrons more than the noble gas configuration. What type of ion will it form? Write the formula of its nitrate, sulphate, phosphate, carbonate and hydroxide. |
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Answer» An atom X has three electrons more than the noble gas configuration. What type of ion will it form? Write the formula of its nitrate, sulphate, phosphate, carbonate and hydroxide. |
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| 14360. |
Can carbon form a ring with 6 carbon atoms only, each one forming a double bond with its 2 adjacent carbon atoms? |
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Answer» Can carbon form a ring with 6 carbon atoms only, each one forming a double bond with its 2 adjacent carbon atoms? |
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| 14361. |
Which among the following is not true about modern periodic table (a) group number of an element gives an idea of the numbers of its valence electrons (b) non metals are present towards the right side of the periodic table (c) hydrides of the elements in the first group will have a similar formula (d) oxides of elements in the first period will have a similar formula |
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Answer» Which among the following is not true about modern periodic table (a) group number of an element gives an idea of the numbers of its valence electrons (b) non metals are present towards the right side of the periodic table (c) hydrides of the elements in the first group will have a similar formula (d) oxides of elements in the first period will have a similar formula |
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| 14362. |
In Bayer's process, what is used to convert impure bauxite to pure alumina? |
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Answer» In Bayer's process, what is used to convert impure bauxite to pure alumina? |
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| 14363. |
What is a condensed structural formula? How do you draw or write them? |
| Answer» What is a condensed structural formula? How do you draw or write them? | |
| 14364. |
2Mg + O2 → 2MgO 2 NO + O2 → 2 NO2 is an example of : |
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Answer» 2Mg + O2 → 2MgO 2 NO + O2 → 2 NO2 is an example of : |
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| 14365. |
Question 11 Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions. |
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Answer» Question 11 Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions. |
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| 14366. |
State the reason: Dry hydrogen chloride gas does not turn blue litmus red whereas dilute hydrochloric acid does. |
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Answer» State the reason: Dry hydrogen chloride gas does not turn blue litmus red whereas dilute hydrochloric acid does. |
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| 14367. |
For the given reaction, 3Fe(s)+xH2O(l)→Fe3O4(s)+4H2(l) What should be the values of x so that it is balanced?4 |
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Answer» For the given reaction, 3Fe(s)+xH2O(l)→Fe3O4(s)+4H2(l) What should be the values of x so that it is balanced?
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| 14368. |
Aluminium reacts with copper sulphate to produce |
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Answer» Aluminium reacts with copper sulphate to produce |
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| 14369. |
The element with the smallest size in group 13 is ___. |
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Answer» The element with the smallest size in group 13 is |
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| 14370. |
Question 4 (b) Draw the structure of the compound Bromopentane. Are structural isomers possible for Bromopentane? |
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Answer» Question 4 (b) |
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| 14371. |
The most distinctive property of noble gas is that they are: |
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Answer» The most distinctive property of noble gas is that they are: |
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| 14372. |
Which of the following is/are thermochemical reaction(s)? |
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Answer» Which of the following is/are thermochemical reaction(s)? |
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| 14373. |
An example of combination reaction between two elements is: |
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Answer» An example of combination reaction between two elements is: |
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| 14374. |
Identify the smallest ion among the following: |
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Answer» Identify the smallest ion among the following: |
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| 14375. |
What is polyethene? Is it a hydrocarbon?How is the bond formation? |
| Answer» What is polyethene? Is it a hydrocarbon?How is the bond formation? | |
| 14376. |
On heating blue colored powder of copper nitrate in a boiling tube ,copper oxide ,oxygen gas and a brown gas x is formed Determine x . |
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Answer» On heating blue colored powder of copper nitrate in a boiling tube ,copper oxide ,oxygen gas and a brown gas x is formed Determine x . |
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| 14377. |
Can electrons leave their shells freely ? |
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Answer» Can electrons leave their shells freely ? |
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| 14378. |
Which other element Rather than the carbon has ability to make long chains? |
| Answer» Which other element Rather than the carbon has ability to make long chains? | |
| 14379. |
Why are Transition metals coloured? |
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Answer» Why are Transition metals coloured? |
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| 14380. |
Which of the following is an ionic compound? |
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Answer» Which of the following is an ionic compound? |
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| 14381. |
Sir I'm Chethan byjus student I know this is a doubts portal only but I'm asking a few things of which I want because I'm getting lot of help from byjus and I clearing very problems and solutions which byjus teachers were sending me.yeah I want to concentrate to boards + NEET exam for only 1st year that class 11th only I need one help I studying class 11th please suggest me books for physics , chemistry , maths and biology accept ncert because if here I ask I get good benefit and teachers are here give a good suggestions for me. So please I don't have any mentor and no one mentor called me.please please I request you not to reject this 🙏please sir/madam help me with this only suggest me best books for NEET + boards which helpful for 1st year. |
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Answer» Sir I'm Chethan byjus student I know this is a doubts portal only but I'm asking a few things of which I want because I'm getting lot of help from byjus and I clearing very problems and solutions which byjus teachers were sending me.yeah I want to concentrate to boards + NEET exam for only 1st year that class 11th only I need one help I studying class 11th please suggest me books for physics , chemistry , maths and biology accept ncert because if here I ask I get good benefit and teachers are here give a good suggestions for me. So please I don't have any mentor and no one mentor called me.please please I request you not to reject this 🙏please sir/madam help me with this only suggest me best books for NEET + boards which helpful for 1st year. |
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| 14382. |
What causes cakes and pastries to be light and fluffy: |
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Answer» What causes cakes and pastries to be light and fluffy: |
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| 14383. |
How can we relate acids, bases and salts with their element Identification? |
| Answer» How can we relate acids, bases and salts with their element Identification? | |
| 14384. |
Three elements that have a single electron in their outermost shells. |
| Answer» Three elements that have a single electron in their outermost shells. | |
| 14385. |
Kalyani was heating an ore X of Zinc in absence of air. She observed that a gas Y is evolved in this process. When she passed the gas through a solution of slaked lime, it turned milky. The ore X and gas Y are- |
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Answer» Kalyani was heating an ore X of Zinc in absence of air. She observed that a gas Y is evolved in this process. When she passed the gas through a solution of slaked lime, it turned milky. The ore X and gas Y are- |
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| 14386. |
What colour change occur if we put litmus paper on salt |
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Answer» What colour change occur if we put litmus paper on salt |
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| 14387. |
A process in which heat is released along with the formation of products is called ___. |
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Answer» A process in which heat is released along with the formation of products is called |
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| 14388. |
Option 20 Which one of the following four metals would be displaced from the solution of its salts by other three metals? a) Mg (b) Ag (c) Zn (d) Cu |
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Answer» Option 20 Which one of the following four metals would be displaced from the solution of its salts by other three metals? a) Mg (b) Ag (c) Zn (d) Cu |
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| 14389. |
An Avogadro number of molecules are present in ___. |
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Answer» An Avogadro number of molecules are present in ___. |
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| 14390. |
What will be the word root in the nomenclature of a compound with six carbon atoms in the main chain? |
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Answer» What will be the word root in the nomenclature of a compound with six carbon atoms in the main chain? |
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| 14391. |
Tin stone or Cassiterite can be separated from gangue by |
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Answer» Tin stone or Cassiterite can be separated from gangue by |
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| 14392. |
In the manufacture of metallic sodium by the fused salt electrolysis (Down's process) a small amount of calcium chloride is added to |
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Answer» In the manufacture of metallic sodium by the fused salt electrolysis (Down's process) a small amount of calcium chloride is added to |
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| 14393. |
Question 63 Of the three metals X, Y and Z, X reacts with cold water, Y with hot water and Z with steam only. Identify X, Y and Z and also arrange them in order of increasing reactivity. |
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Answer» Question 63 |
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| 14394. |
Deserts, grasslands, forests and tundra are examples of __________. |
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Answer» Deserts, grasslands, forests and tundra are examples of __________. |
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| 14395. |
Identify the homologous series among the following: 1. HCOOH 2. CH3COOH 3. C2H6 4. C2H5COOH 5. Propanone |
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Answer» Identify the homologous series among the following: |
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| 14396. |
Which of the following is a combination reaction? |
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Answer» Which of the following is a combination reaction? |
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| 14397. |
Ammonia gas dissolves in water to give ammonium ion.In this reaction water acts as: |
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Answer» Ammonia gas dissolves in water to give ammonium ion.In this reaction water acts as: |
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| 14398. |
Which of the following observations helps to determine whether a chemical reaction has taken place or not? (i) Change in state. (ii) Change in colour. (iii) Change in shape (iv) Evolution of gas. (v) Change in temperature. |
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Answer» Which of the following observations helps to determine whether a chemical reaction has taken place or not? (i) Change in state. (ii) Change in colour. (iii) Change in shape (iv) Evolution of gas. (v) Change in temperature. |
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| 14399. |
What is the pH range at which our body works? |
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Answer» What is the pH range at which our body works? |
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| 14400. |
What is the formula unit mass of Na2O ? 62 |
Answer» What is the formula unit mass of Na2O ?
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