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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.
| 7301. |
Balance the following chemical equation MnO_(2)+HCl to MnCl_(2)+H_(2)O+Cl_(2) |
| Answer» SOLUTION :`MnO_(2)+4HCl to MnCl_(2)+2H_(2)O+Cl_(2)`. | |
| 7302. |
Balance the following chemical equation FeCl_(2)+H_(2)S to FeS+HCl |
| Answer» SOLUTION :`FeCl_(2)+H_(2)S to FeS+2HCl`. | |
| 7303. |
Balance the following chemical equation and identify the type of chemical reaction. a)Mg(s) + Cl_2 (g) to MgCl_2 (s) b) HgO(s) to overset("heat")(to) Hg(l) + O_2 (g) uarr c)Na(s) + S(s) overset("heat")(to) Na_2S (s) |
| Answer» Solution :It is a COMBINATION REACTION. B) It is a thermal DECOMPOSITION reaction. c) It is a combination reaction. | |
| 7304. |
Balance the following chemical equation. (a) HNO_(3)+Ca(OH)_(2)rarrCa(NO_(3))_(2)+H_(2)O (b) NaOH+H_(2)SO_(4)rarrNa_(2)SO_(4)+H_(2)O (c) NaCl+AgNO_(3)rarrAgCl+NaNO_(3) (d) BaCl_(2)+H_(2)SO_(4)rarrBaSO_(4)+HCl |
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Answer» SOLUTION :(a) `2HNO_(3)+CA(OH)_(2)rarrCa(NO_(3))_(2)+2H_(2)O` (b) `2NaOH+H_(2)SO_(4)rarrNa_(2)SO_(4)+2H_(2)O` (c) `NaCl+AgNO_(3)rarrAgCl+NaNO_(3)` (d) `BaCl_(2)+H_(2)SO_(4)rarrBaSO_(4)+2HCl` |
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| 7305. |
Balance the following chemical equation : Fe+H_(2)O to Fe_(3)O_(4)+H_(2) |
| Answer» Solution :The balanced EQUATION is `3Fe+4H_(2)OFe_(3)O_(4)+4H_(2)`. | |
| 7306. |
Balance the chemical equations : NaOH+H_(2)SO_(4) to Na_(2)SO_(4)+H_(2)O |
| Answer» SOLUTION :`2NaOH+H_(2)SO_(4) to Na_(2)SO_(4)+2H_(2)O` | |
| 7307. |
Balance the chemical equations : NaCl+AgNO_(3) to AgCl+NaNO_(3) |
| Answer» SOLUTION :`NaCl+AgNO_(3) to AgCl+NaNO_(3)` | |
| 7308. |
Balance the chemical equations : BaCl_(2)+H_(2)SO_(4) to BaSO_(4)+ HCl |
| Answer» Solution :`BaCl_(2)+H_(2)SO_(4) to BaSO_(4)+ 2HCl` | |
| 7309. |
Balance the chemical equations : HNO_(3)+ Ca(OH)_(2) to Ca(NO_(3))_(2)+ H_(2)O |
| Answer» SOLUTION :`2HNO_(3)+ Ca(OH)_(2) to Ca(NO_(3))_(2)+ 2H_(2)O` | |
| 7310. |
Baking powder is a mixture of _____ and sodium bicarbonate. |
| Answer» SOLUTION :POTASSIUM hydrogentarte | |
| 7311. |
For making cake, baking powder is taken. If at home your mother uses baking soda instead of baking powder in cake. (a) How will it affect the taste of the cake and why? (b) How can baking soda be converted into baking powder ? (c ) What is the role of tartaric acid added to baking soda? |
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Answer» |
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| 7312. |
Baking powder I used for baking. If your mother uses baking soda instead. (a) will It affect the taste of the cake ? How ? Why ? (b) How can baking soda be converted into baking powder ? (c ) What is the role of tartaric acid added to baking soda ? |
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Answer» Solution :(a) Yes, it affects the TASTE of the cake. It makes the ckae taste bitter. This is because of the sodium CARBONATE that is formed as a product of heating baking soda during the process of baking. `2NaHCO_(3) overset("heat")rarr Na_(2)CO_(3) + H_(2)O + CO_(2)` (b) Addition of a mild edible acid (tartaric acid) to baking soda makes it baking powder. (C ) Tartaric acid NEUTRALISES the `Na_(2)CO_(3)` and forms sodium tartrate SALT. Hence the cake does not taste bitter. |
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| 7314. |
Baking powder contains Sodium Hydrogen Carbonate and |
| Answer» Answer :A | |
| 7315. |
BaCl_(2(aq))+H_(2)SO_(4(aq))toBaSO_(4(s))+2HCl_((aq)) is |
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Answer» a non REDOX REACTION |
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| 7316. |
BaC1_(2) + H_(2)SO_(4) to BaSO_(4) + 2HC1 is |
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Answer» COMBINATION reaction |
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| 7318. |
a)What is Biomass. b) An environmentalist on visit to your school suggested the use of three R's to save the environment. Explain what he meant by three 'R's and how you would follow his advice at home. |
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Answer» Solution :a) The material contained in the BODIES of plants and animals is called biomass b) Three R.s to save the environment : We can reduce pressure on the environment by applying the maximum of reduce, recycle and reuse in our lives. Reduce means to use LESS : By switching off unnecessary lights and fans to save electricity. By repairing leaky taps to save water. By not wasting food. Recycle means to collect plastic, paper glass and metal items and recycle these materials to make required things. In order to recycle, firstly segregation of waste is NECESSARY so that materials that can be recycled are not dumped ALONG with other wastes. Reuse means to use things again and again. The used envelope can be reversed and used again instead of being thrown away. The plastic bottles of food items like jam or pickle can be used for STORING things in the kitchen. |
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| 7321. |
Avogadro's numbr is the numbr of particles present in ………………….. Of a susbtance. |
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Answer» 1 molecule |
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| 7322. |
Avogadro's numberis 6.023xx 10 ^(-23) . |
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Answer» |
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| 7324. |
Avogadro's law determines the relation between molecular mass and absolute density. |
| Answer» Solution :Correct statement : Avogadro.s LAW determines the relation between MOLECULAR mass and VAPOUR DENSITY. | |
| 7325. |
Avogadro's Law determinethe relationbetweenmolecularmass and______. |
| Answer» SOLUTION :VAPOUR DENSITY | |
| 7326. |
Avogadro number represents the number of atoms in …………….. . |
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Answer» 12 G of C - 12 |
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| 7327. |
Avogadro's hypothesis is used in the deduction of atomicity of elementary gases. |
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| 7329. |
Averageatom of anelementis calculated by addingthe massesof its _______. |
| Answer» SOLUTION :ISOTOPES | |
| 7330. |
Auro, a 10th standard student was asked to identify iron, copper, zinc and aluminium only by observing the effect of action of concentrated nitric acid and caustic soda on each metal. How did he put the eractions of these metals with each of the reagents? |
| Answer» Solution :`{:("ACTION concentrated nitric ACID","Action of CAUSTIC alkali","Inference"),("No characteristic change","No characteristic change " , "Iron"),("Liberates brown COLOURED" NO_2 "gas", "No characteristic change","Copper"),("Liberates brown coloured"NO_2 "gas","Liberates hydrogen gas","Zinc"),("No Characteristic change ","Liberates hydrogen gas ","Aluminium ") :}` | |
| 7331. |
Atoms which gain electrons are said to be ______ |
| Answer» SOLUTION :ELECTRONEGATIVE | |
| 7332. |
Atoms which have same number of protons but different number of neutrons are called as …………… . |
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Answer» ISOTOPES |
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| 7333. |
Atoms of the same two elements can combine in different ratios to form different compounds. This law is called the |
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Answer» law of CONSTANT COMPOSITION |
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| 7334. |
Atoms of the same element with same atomic number but having different mass number of called……………. |
| Answer» SOLUTION :ISOTOPES | |
| 7338. |
Atoms of seven elements A, B, C, D, E, F, and Ghave different number of electron shells but have the same number of electrons in the outermost shells. How do the following properties vary as we move from A to G? (i) Metallic character (ii) Atomic radii (iii) Valency? |
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Answer» Solution :Since the elements have the same number of electrons in their outermost shells, all of them LIE in the same group. Hence, as we move down a group, i.e., as we move from A to G: i] METALLIC character increases II] atomic radii increases III] valency remains the same |
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| 7339. |
Atoms of seven elements A, B, C, D, E, F and G have a different number of electronic shells buthave the same number of electrons in their outermost shells. The elements A and C combine with chlorine to form an acid and common salt respectively. The oxide of element A is liquid at room temperature and is a neutral substance, while the oxides of the remaining six elements are basic in nature. Based on the above information answer the following questions: (i) What could the element A be? (ii) Will elements A to G belong to the same period or same group of the periodic table? (iii) Write the formula of the compound formed by the reaction of the element A with oxygen. (iv) Show the formation of the compound by a combination of element C with chlorine with the help of electronic structure. (v) What would be the ratio of number of combining atoms in a compound formed by the combination of element A with carbon?(vi) Which one of the given elements is likely to have the smallest atomic radius? |
Answer» SOLUTION :
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| 7341. |
Atoms of seven elements A, B, C, D, E, F and G have a different number of electronic shells but have the same number of electrons in their outermost shells. The elements A and C combine with chlorine to form an acid and common salt respectively. The oxide of element A is liquid at room temperature and is a neutral substance while the oxides of the remaining six elements are basic in nature. Based on the above information, answer the following questions given ahead : (i) What could the element A be ? (ii) Will elements A to G belong to the same period or same group of the periodic table ? (iii) Write the formula of the compound formed by the reaction of the element A with oxygen. (iv) Show the formation of the compound by a combination of element C with chlorine with the help of electronic structure. (v) What would be the ratio of number of combining atoms in a compound formed by the combination element A with carbon ? (vi) Which one of the given elements is likely to have the smallest atomic radius ? |
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Answer» Solution :Since all the seven elements have same number of electrons in their outer most shells, this means that they belong to the same group. From the available information, it BECOMES clear that the group is of alkali METALS (group 1). Hydrogen (A) is also included. The elements present are, `{:(H,Li,Na,K,Rb,Cs,Fr,),((A),(B),(C),(D),(E),(F),(G),):}` Let us answer the questions asked (i) The element 'X is hydrogen (H) (ii) The elements 'X to 'G' belong to the same group and not same period (iii) The formula of compound is `H_(2)O` (iv) Compound between 'C' and chlorine (Cl) is sodium chloride (NaCl) formed by the transference of one electron.  (v) The compound formed between 'A' (H) and carbon is methane `(CH_(4)).` In this the two elements are present in the ratio of 1 : 4 (VI) The element A (hydrogen) has the smallest atomic RADIUS since it is the first element of the group. |
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| 7342. |
Atoms of one element can be transmuted into atoms of other element by ………………. . |
| Answer» SOLUTION :ARTIFICIAL TRANSMUTATION | |
| 7343. |
Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electronic shells but different number of electrons in their outermost shell. It was found that elements A and G combine to form an ionic compound which can also be extracted from sea water. This compound is added in a small amount to almost all vegetable dishes during cooking. Oxides of elements A and B are basic in nature while those of E and Fare acidic. The oxide of D is almost neutral. Based on the above information, answer the following questions:(i) To which group or period of the periodic table do the listed elements belong? (ii) What would be the nature of compounds formed by a combination of elements B and F? (iii) Which two of these elements could definitely be metals and which are likely to benon-metals? (iv) Which one of the eight elements is most likely to be found in gaseous state at roomtemperature? (v) If the number of electrons in the outermost shell of elements C and G be 3 and 7 respectively, write the formula of the compound formed by the combination of C and G. (vi) Which one of the eight elements is likely to be a noble gas? (vii) Which one of the eight elements would have the largest atomic radius?(viii) Which one of these eight elements is likely to be a semi-metal or metalloid? |
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Answer» Solution :(i) Third period Group -1, 2, 13, 14, 15, 16, 17, 18 respectively. (ii) Nature of compound: Electrovalent/ionic (iii) Metals-A and B, Non-metals-E, F, G (iv) G/H (V) `CG_3` (VI) H (vii) A (viii) D |
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| 7344. |
Atoms of eight elements A,B,C,D,E,F,G and H have the same number of electron shells but different number of electrons in their outermost shells. It was found that elements A and G combine to form an ionic compound. This ionic compound is added in a small amount to almost all vegetables and dishes during cooking. Oxides of elements A and B are basic in nature while those of elements E and F are acidic. The oxide of element D is however, almost neutral. based on the above information, answer the following questions: (a) To which group or period of the periodic table do these elements belong? (b) What would be the nature of compound formed by a combination of elements B and F? (c) Which two of these elements could definetely be metals? (d) Which one of the eight elements is most likely to be found in gaseous state at room temperature? (e) If the number of electrons in the outermost shell of elements C and G be 3 and 7 respectively, write the formula of the compound formed by the combination of C and G. |
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Answer» |
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| 7345. |
Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electronic shells but different in their outermost shells. It was found that elements A and G combine to form an ionic compound which can also be extracted from sea water. Oxides of the elements A and B are basic in nature while those of E and F are acidic. The oxide of elements D is almost neutral. Answer the following questions based on the information given here in : (i) To which group or period of the periodic table do the listed elements belong ? (ii) Which one of the eight elements is likely to be a noble gas? (iii) Which one of the eight elements would have the largest atomic radius ? (iv) Which two elements amongst these are likely to be the non-metals? (v) Which one of these eight elements is likely to be a semi-metal or metalloid ? |
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Answer» Solution :(i) A and B belong to group 1 and 2 because they form basic oxides. C belongs to group 13 as it has 3 valence electrons. D belongs to group 14 as it FORMS almost netural oxide. E and F belong to group 15 and16 as they form acidic oxides, G belongs to group 17as it has 7 valence electrons, and H to group 18. They belong to `3^(rd)` period of the PERIODIC table. (ii) H belongs to noble gas (iii) A has largest ATOMIC radius (IV) E and F are likely to be non-metals (v) D is likely to be metalloid or semi-metal. |
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| 7346. |
Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electronic shells but different number of electrons in their outermost shell. It was found chat elements A and G combine to form an ionic compound. This compound is added in a small amount to almost all vegetable dishes during cooking Oxides of elements A and B are basic in nature while those of E and F are acidic. The oxide of D is almost neutral. Based on the above information answer the following questions : (i) To which group or period of the periodic table do the listed elements belong ? (ii) What would be the nature of compound formed by a combination of elements B and F ? (iii) Which two elements could definitely be metals ? (iv) Which one of the eight elements is most likely to be found in gaseous state at room temperature ? (v) If the number of electrons in che outermost shell of elements C and G be 3 and 7 respectively, write the formula of rhe compound formed by the combination of C and G. |
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Answer» Solution :The clue for the answer is given by the compound which is added to almost all vegetables during cooking. lt is sodium chloride (NaCl). Boch these elements belong to third period : (i) All the elements belong to third period. They have three shells (K, L, M) and the number of electrons vary from 1 to 8. These belong co different groups which are listed. `{:("Element":,A,B,C,D,E,F,G,H,),("Group" :,1,2,13,14,15,16,17,18,):}` (ii) The element 'B' is Ca and 'F' is S. They combine co form CaS. lt is an ionic compound. (iii) The elements A, B are definite metals because the elements PRESENT in group 1 and 2 are all metals. (iv) The element H is a noble gas element. It is most LIKELY to be found in the gaseous State at room temperature. (v) The electronic configuration of the element C(Z = 13) is 2, 8, 3 while that of G(Z = 17) is 2, 8, 7. The formula of the compound formed by their combination is `CG_(3).` lt is ACTUALLY `AlCl_(3)` and is formed as a result of electron sharing . 
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| 7347. |
Atomsof differentelementswith differentatomicnumbers , butsamemassnumberareknownas _______. |
| Answer» Answer :A | |
| 7348. |
Atoms of different elements having same numbr of …………..are called isotones. |
| Answer» SOLUTION :NEUTRONS | |
| 7349. |
Atoms of different elements having the same number of neutrons but different atomic number and different mass number are callled ……………… . |
| Answer» SOLUTION :ISOTONES | |
| 7350. |
Atoms of different elements having …………..mass number, but …………….atomic numbers are called isobars. |
| Answer» SOLUTION :Same, DIFFERENT | |