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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.
| 17501. |
Which one of the following will not undergo Hofmann bromamide reaction?(a) CH3CONHCH3 (b) CH3CH2CONH2 (c) CH3CONH2 (d) C6H5CONH2 |
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Answer» (a) CH3CONHCH3 Only primary amides undergo hoffmann bromamide reaction |
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| 17502. |
You are Sadasivam. You recently visited your native town in Vellore. You happened to accompany your grandmother to your family temple. You were shocked to notice the poor condition and maintenance of the temple. Write a letter to the Editor of local newspaper highlighting the poor condition of the temple. Also give some suggestions and request the HRC to take steps to improve the situation. |
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Answer» Mr.Sadasivam Subash street Sathuvachary Vellore 21st June, 2020 To The Editor The Hindu Bose Bank Road Vellore Sir / Madam Sub: Poor maintenance of the Temple This is to bring to the notice of the authorities concerned over the deliberate damage done to Vinayagar Temple in Sathuvachary. What shocks me most is the negligence and indifference of the civic authorities to the maintenance and conservation of these temples frequently visited by tourists. These temples are not only the irreplaceable symbols of our past culture and traditional importance, but also a very rich source of earnings. If foreign and local tourists stop visiting these places because of poor maintenance, the consequences will be quite massive. The damaged areas of these buildings must be improved and repaired. Installation of CCTV cameras, putting sentries on duty, sanitation, and providing some facilities for the tourists also must be looked into. In the absence of proper restrooms, the immediate surroundings of these places have become very unhealthy. Through the columns of your venerated daily I appeal to the concerned authorities of HRC to look into the problem and do the needful. After all these temples are symbols and treasures of our cultural heritage. Through this letter, let me request the public to showcase their civic responsibilities. I also appeal to the authorities to take the necessary action to maintain a congenial atmosphere to worship the deity Yours truly, Sadasivam To The Editor. The Hindu Bose Bank Road Vellore |
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| 17503. |
Which one of the following is the best reagent used to convert Nitrobenzene into Nitroso benzene?.(a) Sn/HCI(b) Zn/NH4CI (c) Fe/H2O(g) (d) SnCl2 + KOH |
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Answer» Fe/H2O(g) is the best reagent used to convert Nitrobenzene into Nitroso benzene. |
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| 17504. |
The method by which aniline cannot be prepared is …………… (a) degradation of benzamide with Br2 / NaOH (b) potassium salt of phthalimide treated with chlorobenzene followed by hydrolysis with aqueous NaOH solution. (c) Hydrolysis of phenylcyanide with acidic solution (d) reduction of nitrobenzene by Sn / HCI |
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Answer» (b) potassium salt of phthalimide treated with chlorobenzene followed by hydrolysis with aqueous NaOH solution. |
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| 17505. |
Which of the following reagent can be used to convert nitrobenzene to aniline? (a) Sn / HCl (b) ZnHg / NaOH (c) LiAIH4 (d) All of these |
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Answer» (a) Sn / HC |
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| 17506. |
Assertion(A): Acetanilide is less basic than anime. Reason (R): Acetylation of aniline results in the decrease of electron density on nitrogen. (a) Both A and R are correct and R explains A. (b) Both A and R are wrong (c) A is correct but R is wrong (d) A is wrong but R is correct |
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Answer» (a) Both A and R are correct and R explains A. |
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| 17507. |
Assertion(A): Aromatic 1° amines can be prepared by Gabriel phthalimide synthesis. Reason (R): Aryl halides undergo nucleophilic substitution with the anion formed by phthalimide. (a) Both A and R are correct and R is explains A (b) Both A and R are wrong (c) A is correct but R is wrong (d) A is wrong but R is correct |
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Answer» (b) Both A and R are wrong |
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| 17508. |
How many molecules of ATP and how many molecules of NADPH+ H+ are spent to fix three molecules of CO2? |
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Answer» Fixation of three molecules of CO2 uses 9 ATP and 6 NADPH molecules in C3 plants.In C4 plants for fixation of 3CO2 molecules 15 ATP and 6 NADPH and 6 NADPH energy is equired. |
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| 17509. |
Write 3 points of differences between electromagnetic waves and matter waves. |
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| 17510. |
A non-metal A which is the largest constituent of air combines with hydrogen on heating in the presence of Fe (as catalyst) and forms a gas B. When this gas B is treated with H2SO4, compound C is formed which is broadly used as chemical fertiliser. (i) Identify A, B and C. (ii) Locate the position of A in the modern periodic table. (iii) Which elements are present before and after the element A? (iv) Write the electronic configuration of element A. |
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Answer» (i) The largest non-metal constituent of air is nitrogen (N) and it is present as N2 gas .It reacts with hydrogen in presence of Fe catalyst to give Ammonia (NH3). Ammonia reacts with conc. H2SO4 to give ammonium sulphate (NH4)2SO4. Thus A= Nitrogen (N) B=Ammonia (NH3) C= Ammonium sulphate (NH4)2SO4 (ii) Element A is Nitrogen. It lies in the 2nd period and 15th group of the modern periodic table. (iii) Carbon comes before nitrogen and oxygen comes after nitrogen in the 2nd period. (iv) The atomic number of nitrogen is 7. So, its electronic configuration is 2,5. |
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| 17511. |
Which of the following is the outermost shell for elements of period 2? (a) K shell (b) L shell (c) M shell(d) N shell |
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Answer» The answer is (b) L shell In period 18 there are two shells K and L |
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| 17512. |
A non-metal X which is the largest constituent of air combines with hydrogen when heated in the presence of iron as catalyst to form a gas Y. When gas Y is treated with sulphuric acid, it forms a compound Z which is used as a chemical fertiliser.(a) What are X, Y and Z ?(b) To which group of periodic table does X belong ?(c) Name the period of periodic table in which X is placed.(d) Which element is placed just before X in the period ?(e) Which element is placed just after X in the period ? |
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Answer» (a) X is nitrogen gas, N2 ; Y is ammonia gas, NH3 and Z is ammonium sulphate, (NH ) SO4. (b) 15 th group . (c) 2 nd period. (d) Carbon, C . (e) Oxygen, O. |
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| 17513. |
An element which is an essential constituent of all organic compounds belongs to (a) group 1 (b) group 14 (c) group 15 (d) group 16 |
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Answer» The answer is (b) group 14 Carbon is an essential constituent of all organic compounds which belongs to group 14. |
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| 17514. |
what is the difference between the molecules of elements and compounds? |
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Answer» 1. Elements contain only one kind of atoms in the free state or combined state. 2. An element cannot be decomposed into simple substances by any chemical reaction or simple physical process, e.g. copper, iron, oxygen. 3. A compound is produced by a chemical reaction of two or more elements. 4. The constituents of a compound can be separated by a chemical process, e.g. salt, water and sugar. |
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| 17515. |
Assertion (A) : All the decomposition reactions are endothermic. Reason (R) : Decomposition reactions require energy in the form of heat, light or electricity. A) Both ‘A’ and ‘R’ are correct and ‘A’ is supported by ‘R’. B) Both ‘A’ and ‘R’ are correct, but ‘A’ is not supported by ‘R’ C) ‘A’ is correct, but ‘R’ is incorrect. D) ‘A’ is incorrect, but ‘R’ is correct. |
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Answer» A) Both ‘A’ and ‘R’ are correct and ‘A’ is supported by ‘R’. |
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| 17516. |
Some metals react with water and produce metal oxides or hydroxides and liberate hydrogen gas. Metals like sodium and potassium react violently with cold water. However, calcium reacts less violently with cold water because it is less reactive as compared to Na and K. Magnesium does not react with cold water. It reacts with hot water to form magnesium hydroxide and hydrogen gas. Metals like aluminium, iron and zinc do not react with cold as well as hot water but they react with steam to form metal oxide and hydrogen gas.(i) Which gas is produced when reactive metal reacts with water ?(ii) How can we extinguish fire ?(iii) Why is sodium kept in Kerosene oil ?(iv) Which metal did not react with water even in the form of steam ?(v) How can we prevent iron from rust ? |
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Answer» (i) Hydrogen gas. (ii) By carbon dioxide gas. (iii) Because sodium reacts violently with water and air. (iv) Lead, copper or gold. (v) By painting iron articles. |
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| 17517. |
Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity. |
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Answer» (i) CaCO3(s) +heat → CaO(s) +CO2(g) CaCO3(s)-(Calcium carbonate) CaO(s)-(Calcium oxide) CO2(g)-(Carbon dioxide) (ii) 2AgCl(s) +Sunlight → 2Ag(s) +Cl2(g) 2AgCl(s)-(Silver chloride) 2Ag(s)-(Silver) Cl2(g)-(Chlorine) (iii) 2H2O(l) +Electric current → 2H2(g) +O2(g) 2H2O(l)-(Water) 2H2(g)-(Hydrogen) O2(g)-(Oxygen) |
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| 17518. |
A substance that can donate a lone pair of electrons is a ____________ according to ____________ theory. |
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Answer» A substance that can donate a lone pair of electrons is a base according to Lewis theory. |
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| 17519. |
The molecule or ion that is formed when an acid loses its proton is called the ______________. |
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Answer» The molecule or ion that is formed when an acid loses its proton is called the conjugate base |
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| 17520. |
State the number of elements in the modern periodic table. |
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Answer» There are 118 elements in the modern periodic table. |
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| 17521. |
Reagents that seek to react with a proton or some other electron-deficient center are called ____________ . |
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Answer» Reagents that seek to react with a proton or some other electron-deficient center are called nucleophiles |
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| 17522. |
Ria and Rama are students of Class-X. Ria is very much organised and maintained. The teachers love her. She earns a great respect in the class whereas Rama is unorganised and always faces a lot of problems in handling life situations.Answer the following questions based on above information:(i) In your opinion how does organisation help in daily life?(ii) How can you relate the above fact with the chapter-classification of elements'?(iii) How does classification of elements help us in studying them properly? |
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Answer» (i) Organisation makes our life simple, easy and systematic. |
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| 17523. |
The Modern periodic table is important because it is organized to provide a great deal of information about elements and how they relate to one another in one easy-to-use reference. The table can be used to predict the properties of elements, even those that have not yet been discovered. It is called the periodic table because of the way the elements are arranged. The horizontal rows (which go from left to right) are called 'periods' and the vertical columns (going from up to down) are called 'groups'. Refer to the table and answer1. Name the elements present in group-17 of the Modern Periodic Table.a. Fb. Clc. Brd. All the options2. How many elements are present in period 1 in the table above?a. 2b. 3c. 4d. 53. Which is the element whose atomic weight were corrected in the Modern periodic table on the basis of their position in Mendeleev's periodic table?a. Goldb. Platinumc. Both option 1 and 2d. Hydrogen4. Who proposed the Modern Periodic Law?a. Henry Moseleyb. John New landc. Mendeleevd. Johann Wolfgang Dobereiner5. What is meant by a group in the periodic table?a. horizontal rowsb. vertical columns |
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Answer» 1. d. All the options 2. a. 2 3. c. Both option 1 and 2 4. c. Mendeleev 5. b. vertical columns |
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| 17524. |
Atomic size means radius of an atom. Hema, when read this statement understood that it is the distance between centre of nucleus and the outermost shell (valence shell) of an isolated atom. She also came to know that atomic size generally increases from top to bottom in a group, due to addition of a new shell and decrease along a period from left to right, due to increase in nuclear charge which pulls the electrons towards it. (i) Hema has to arrange the following elements in an increasing order in a group in accordance of their atomic size Li,Rb, K, Cs, Na.(ii) Atomic number is considered to be a more appropriate parameter than atomic mass for classification of elements in a periodic table' Give any two reasons to justify the statement |
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Answer» (i) Elements arranged in an increasing order in a group are : Li, Na, K, Rb, Cs. (ii) (a) Although most of the elements were placed in the order of increasing atomic masses, increasing order could not be maintained in all cases. (b) There was no place for isotopes in Mendeleev's periodic table, although they differ in atomic mass. |
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| 17525. |
Ria and Reena are the students of Class X' Ria is very much organized and maintained whereas Reena is an unorganised student and always faces a lot of problems in handling life situations. (a) How organization helps in daily life ? (b) How can you relate the above fact with the chapter 'Classification of Elements'. How classification of elements help us studying them properly ? |
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Answer» (a) Organization is all about keeping things in proper order. It plays a significant role in helping us in achieving our goals. It gives us u sl.tse of control and allows for increased productivity. (b) Classification of elements is based on Organisation of the element in a proper manner that helps to make the study of all the elements easier. To make the study of all the elements in the periodic table easy, these elements have been divided into few groups in such a way that elements in the same group have similar Properties. |
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| 17526. |
Atomic number of a few elements are given below 10, 20, 7, 14 (a) Identify the elements (b) Identify the Group number of these elements in the Periodic Table (c) Identify the Periods of these elements in the Periodic Table (d) What would be the electronic configuration for each of these elements?(e) Determine the valency of these elements |
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Answer» (a) Elements— Neon (Ne), Calcium (Ca), Nitrogen (N), Silicon (Si) (b) Group— 18, 2, 15, 14 (c) Period— 2, 4 , 2, 3 (d) Electron configuration— (2, 8); (2, 8, 8, 2); (2, 5); (2, 8, 4) (e) Valency— 0, 2, 3, 4 |
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| 17527. |
Atomic number of a few elements are given below 10,20,7,14 (a) Identify the elements (b) Identify the Group number of these elements in the Periodic Table (c) Identify the Periods of these elements in the Periodic Table (d) What would be the electronic configuration for each of these elements ? (e) Determine the valency of these elements. |
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Answer» (a) (i) At. no. 10→ Neon (ii) At no. 20 → Calcium (iii) At no. 7→ Nitrogen (iv) At no. 14→ Silicon (b) (i) Group of Neorr→ 18th Group (ii) Calcium→ 2nd Group (iii) Nitrogen→ 15th Group (iv) Silicon→14th Group (c) Period number (i) Neon- 2nd Period (ii) Calcium- 4th period (iii) Nitrogen - 2nd period (iv) Silicon - 3rd Period (d) Neon - 2, 8 Calcium -2,8,8,2 Nitrogen - 2, 5 Silicon -2,8,4 (e) Valency Neon - Zero Calcium - 2 Nitrogen - 3 Silicon-4. |
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| 17528. |
Properties of the elements are given below. Where would you locate the following elements in the periodic table?(a) A soft metal stored under kerosene (b) An element with variable (more than one) valency stored underwater.(c) An element which is tetravalent and forms the basis of organic chemistry (d) An element which is an inert gas with atomic number 2 (e) An element whose thin oxide layer is used to make other elements corrosion-resistant by the process of “ anodising'' |
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Answer» (a) Sodium (Na) Group 1 and Period 3 or Potassium (K) Group 1 and Period 4 (b) Phosphorus (P) Group 15 and Period 3 (c) Carbon (C) Group 14 and Period 2 (d) Helium (He) Group 18 and Period 1 (e) Aluminium (Al) Group 13 and Period 3 |
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| 17529. |
After the rejection of Newlands Raw of Octaves, various scientists were in the search of a relationship that patterned the properties of all elements with their respective atomic masses. Meanwhile, Dmitri lvanovich Mendeleev, a Russian chemist became the important contributor for the development of the system of Periodic Table of elements where the elements were arranged on the basis of their fundamental property, the atomic mass, and also on the similarity of chemical properties. The above image indicates some part of the Mendeleev's Periodic Table.1. When Mendeleev was working with his periodic table, ........ elements were known.a. 58b. 63c. 108d. 1122. Mendeleev's Periodic Raw, states that the properties of elements are the periodic function of their atomic numbers.N State true or false.a. TRUEb. FALSE3. Identify the elements which were not discovered at the time of Mendeleev.a. scandiumb. galliumc. germaniumd. All the options4. Name the vertical columns in Mendeleev's Periodic Table.a. Groupsb. Elementsc. Periodsd. Functions5. Lame the horizontal rows in Mendeleev's Periodic Table.a. Groupsb. Elementsc. Periodsd. Functions |
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Answer» 1. b. 63 2. b. FALSE 3. d. All the options 4. a. Groups 5. c. Periods |
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| 17530. |
Is PbO2 a base or not? Comment. |
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Answer» Lead oxide is not a base because when it reacts with acid it forms chlorine along with salt and water. Thus, it is excluded from the class bases. PbO2 + 4HCl → PbCl2 + Cl2 + 2H2O |
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| 17531. |
The image above shows the electronic configuration of Y element. An element Y which is non-metallic element of Group 15. Element Y's gas is generally inert, nonmetallic, colorless, odorless and tasteless. This was discovered by Daniel Rutherford.1. Name the element Y.a. Argonb. Neonc. Heliumd. Nitrogen2. What is the atomic number of Y?a. 7b. 6c. 14d. 153. What is the atomic weight of Y?a. 12b. 13c. 14d. 154. What type of bond is formed in diatomic molecule of Y?a. Ionic bondb. Single covalent bondc. Double covalent bondd. Triple covalent bond5. Give the uses of Y.a. used to make fertilisersb. used to make nitric acidc. Both option a and bd. None |
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Answer» 1. d. Nitrogen 2. a. 7 3. c. 14 4. d. Triple covalent bond 5. c. Both option a and b |
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| 17532. |
The element Z is placed in 2nd group of the modern periodic table, it burns in the presence of oxygen to form basic oxide. To extract the element Z, calcium hydroxide is added to seawater to form magnesium hydroxide precipitate. It is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column of the periodic table. The most common and stable type of Z atom found in nature has 12 protons.1. Give the name of the element Z.a. Nitrogenb. Magnesiumc. Borond. Chlorine2. Give the nuclear symbol of element Z.a. Beb. Cac. Mgd. Sr3. Identify the number of neutrons and electrons of element Z.a. 12,12b. 12,11c. 11,12d. 12,104. Give the electronic configuration of Z.a. 2,8,3b. 2,8,2c. 2,8,1d. 2,8,35. Which period does this element belong to, in the periodic table?a. 1b. 2c. 3d. 4 |
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Answer» 1. c. Boron 2. c. Mg 3. a. 12,12 4. b. 2,8,2 5. c. 3 |
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| 17533. |
Which combination of reagents is the least effective in generating sodium ethoxide, CH3CH2ONa? (A) CH3CH2OH + NaH (B) CH3CH2OH + NaNH2 (C) CH3CH2OH + NaOH (D) CH3CH2OH + CH3Li (E) CH3CH2OH + HC=CNa |
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Answer» (C) CH3CH2OH + NaO |
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| 17534. |
A few crystals of copper sulphate are heated in B/F dry boiling tube :(i) What is the colour before and after heating ?(ii) What is the reason for the colour change ?(iii) Can its original colour be restored ? How ? |
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Answer» (i) Blue and white respectively. (ii) Water of crystallization is lost on heating. (iii) Yes' by adding water. |
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| 17535. |
(a) what effect does the concentration of [H3O+] ion have on solution?(b) Do basic solutions also have H+(aq)? Why are they basic? |
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Answer» (a) As the concentration of [H3O+] increases in solution, the pH decreases. Consequently, the acidity of the solution increases. (b) Yes, basic solutions also have H + (aq) ions. Basic solutions have lower concentration of H + (aq) in comparison to concentration of OH − (aq) ions. |
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| 17536. |
What is the group of this element? |
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Answer» The group of this element is 2. |
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| 17537. |
Which reaction of these potential acids and bases does not occur to any appreciable degree due to an unfavorable equilibrium? (A) NaNH2 + CH3CH2CH2CH2CH2OH(B) CH3CH2CO2H + NaCl (C) NaHCO3 + CH3CH2CO2H (D) NaH + CH3CH2CH2CH2CH2NH2 (E) all of the above will occur due to a favorable equilibrium |
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Answer» (E) all of the above will occur due to a favorable equilibrium |
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| 17538. |
How H3O+ ion is formed in water solution? |
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Answer» When acid is added to water, H+ ions are formed in the solution. These ions cannot exist alone and hence they readily combine with water molecules to form the hydronium ion (H3O+). H+ + H2O → H3O+ |
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| 17539. |
what happens when Blue crystals of copper sulphate are heated. |
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Answer» Blue copperr sulphate crystals on heaning lose water of crystallisation and become white. When these crystals are left open, will absorb moisture from air and regain blue colour. |
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| 17540. |
A: Nitroso Iron (II) sulphateB: Iron (III) chlorideC: Chromium sulphateD: Lead (II) chlorideE: Sodium chloride. Select from A, B, C, D and E –1. A compound soluble in hot water but insoluble in cold water.2. A compound which in the aqueous solution state,is neutral in nature.3. A deliquescent compound. |
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Answer» 1. Lead (II) chloride 2. Sodium chloride 3. Iron (II) chloride |
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| 17541. |
Which reaction of these potential acids and bases does not occur to any appreciable degree due to an unfavorable equilibrium? (A) NaOH (aq) + CH3CH2CH2CO2H (B) CH3CH2ONa in ethanol + ethene (C) CH3Li in hexane + ethyne (D) NaNH2 in liq. NH3 + ethanol (E) NaC2H3O2 (aq) + HI |
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Answer» (B) CH3CH2ONa in ethanol + ethene |
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| 17542. |
Which pair of species are both bases in the following reaction? HCN and H2O H3O+ and CN-(A) H2O and CN-(B) H3O+ and H2O (C) HCN and H3O+ (D) HCN and CN-(E) H3O+ and CN- |
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Answer» (A) H2O and CN- |
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| 17543. |
State three uses of hydrochloric acid. |
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Answer» (i) It is used in the manufacture of silver chloride, which is used widely in photography. (ii) It is used in the manufacture of dyes, drugs and paints. (iii) It is used for cleaning metal surface before painting, electroplating, galvanising, soldering etc. |
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| 17544. |
In the following set of elements, one element does not belong to the set. Select this element and state why it does not belong :Oxygen, Nitrogen, Carbon, Chlorine, Fluorine |
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Answer» Chlorine does not belong to the set. This is because all other elements belong to 2nd period whereas chlorine belongs to 3rd period. |
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| 17545. |
Distinguish between Iron (II) chloride and Iron (III) chloride. |
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Answer» Iron (II) chloride is dissolved in water and then sodium hydroxide is added. A dirty green precipitate is obtained which confirms the presence of iron (II) chloride. FeCl2 + 2NaOH → Fe(OH)2 + 2NaCl Iron (IK) chloride is also dissolved in water and then sodium hydroxide solution is added. A reddish brown precipitate is obtained, which confirms the presence of iron (HI) chloride. FeCl3 + 3NaOH → Fe(OH)3 + 3NaCl |
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| 17546. |
What compounds are produced when sodium nitrate is added to a mixture of water and ethanol? (A) HNO3 + NaOH (B) HNO3 + CH3CH2ONa (C) NaOH + CH3CH2ONa (D) CH3CH2OCH2CH3 + NaOH (E) No reaction occurs |
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Answer» (E) No reaction occurs |
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| 17547. |
State the colours of the aqueous solution of the following salts:(a) Calcium sulphate crystals(b) Ferrous chloride crystals(c) Ferric chloride crystals(d) Ferrous sulphate crystals(e) Ferric sulphate crystals(f) Copper sulphate crystals. |
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Answer» (a) Colourless (b) Blue green (c) Yellow (d) Green (e) Yellowish white (f) Blue |
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| 17548. |
Distinguish between Sodium carbonate and sodium nitrate. |
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Answer» Sodium carbonate when treated with dilute hydrochloric acid, a vigorous reaction takes place and a colourless, odourless gas carbon dioxide is evolved which turns lime water milky. Na2CO3 + 2HCl → 2NaCl + H2O + CO2 Sodium nitrate when mixed with copper filings and heated with concentrated sulphuric acid, reddish brown fumes of nitrogen dioxide are evolved. 2NaNO3 + H2SO4 → Na2SO4 + 2HNO3 Cu + 4HNO3 → Cu(NO3)2 + 2NO2 + 2H2O. |
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| 17549. |
Distinguish between Lead nitrate and copper nitrate. |
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Answer» Lead nitrate is dissolved in water and then sodium hydroxide solution is added, a white precipitate is obtained, which is soluble in excess of sodium hydroxide. Pb(NO3)2 + 2NaOH → Pb(OH)2 + 2NaNO3 Copper nitrate is dissolved in water and sodium hydroxide solution is added, a light blue precipitate of copper hydroxide is obtained. Cu(NO3)2 + 2NaOH → Cu(OH)2 + 2NaNO3 |
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| 17550. |
What would you observe when:(a) blue litmus is introduced into a solution of ferric chloride,(b) red litmus paper is introduced into a solution of sodium sulphate,(c) red litmus paper is introduced in sodium carbonate solution? |
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Answer» (a) Blue litmus will turn into red which will indicate the solution to be acidic. (b) No change will be observed. (c) Red litmus will turn into blue will indicate the solution to be basic |
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