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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
CHEMISTRYWhen 0.1 g of hydrogen is burnt in oxygen, the number of water molecules produced isequal to(a) 6.02 x 1023 (b) 3,01 x 1023 (c) 3,01 x 10 (d) 6.02 x 1022How many moles of electrons weigh one kilogram?16.023(a) 6.02 x 10(b)-x1039.1089.10813233--x10%1(d)-*10*9.108x6.0233.Number of atom in 558.5 g Fe (At. wt. of Fe = 55.85 g mol-'), is(a) twice that in 60 g carbon (b) 6.023 x 1022(C) half that in 8 g He(d) 558.5 x 6.023 x 102316 34 -0.56 g of a gas occupies 80 cm' at NTP, then its molecular mass is(a) 4.8 (b) 44.8 © 2(d) 22.45.The maximum number of molecules will be present in(a) 16 g of NO, gas (b) 16 g of O, gas (©) 7 g of N, gas (d) 2 g of H, gasWhich has maximum number of atoms?(a) 24 g C(12) (6) 56 g of Fe (56) (c) 27 g of AI (27) (d) 108 g of Ag (108)6.7.Which of the following statements is dependent on temperature ?(a) Molality (b) Molarity (C) Mole fraction (d) Weight percentage3536-313839yoWhich of the following constitute 0.1 g mole?(a) 6.023 x 1022 molecules of benzene (b) 0.14 g of N, gasC) 2.24 litres of Co, at STP. (d) 0.40 g of He gasWhich of the following are elements ?(a) Diamond (b) Graphite (c) Fools gold (d)A&B9.10.Which of the following are mixtures ?(a) Gasoline (b) Steel (c) Sodium (d)A&BWhich of the following is/are mixture ?(a) lodised salt (b) Steam (c) Rb (d) Fr |
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Answer» that's TOOO long too ANS.....ask these QUESTIONS in bits and PIECES...... |
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| 2. |
3. When barium hydroxide is added to hydrochloric acid, a white-colouredbarium chloride is formed. Write a balanced chemical equation for thereaction? |
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Answer» Explanation: |
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| 3. |
Enzymes are complex ------ compounds made up of ------ units.inorganic , fatsorganic , proteinsorganic , fats |
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| 4. |
If the rate law does not contain a concentration term then the order is -a) zerob) firstc) secondd) thirdThe units of rate and rate constant are same for a reaction whose order is |
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Answer» Answer: option A is the correct answer MAY be its HELPS you Explanation: |
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| 5. |
What do you observe whenH2S is passed through CuSO4solution. |
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Answer» Explanation: The process by which a living being utilizes the FOOD to get ENERGY is called respiration. Respiration is an oxidation REACTION in which carbohydrate is oxidized to produce energy. Mitochondrion is the site of respiration and the energy RELEASED is stored in the form of ATP (Adenosine triphosphate)The process by which a living being utilizes the food to get energy is called respiration. Respiration is an oxidation reaction in which carbohydrate is oxidized to produce energy. Mitochondrion is the site of respiration and the energy released is stored in the form of ATP (Adenosine triphosphate)The process by which a living being utilizes the food to get energy is called respiration. Respiration is an oxidation reaction in which carbohydrate is oxidized to produce energy. Mitochondrion is the site of respiration and the energy released is stored in the form of ATP (Adenosine triphosphate)The process by which a living being utilizes the food to get energy is called respiration. Respiration is an oxidation reaction in which carbohydrate is oxidized to produce energy. Mitochondrion is the site of respiration and the energy released is stored in the form of ATP (Adenosine triphosphate)MARK me BRAINLEIST Follow me Thank my answers ❤❤❤Mark me BRAINLEIST Follow me Thank my answers ❤❤❤Mark me BRAINLEIST Follow me Thank my answers ❤❤❤ |
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| 6. |
Many elements such as alkaline earths, which form refractory oxides require somewhat......temperature for decomposition and for such elements .....is satisfactory.da) higher, air-acetylene mixture (b) medium , air-coal gas inixture(c) more, air-propane mixture (d) Icw, N2O-acetylene mixture |
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Answer» (C)... |
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| 7. |
PAGE NO.DATEyou are the secuetany a libee Engliste. Det storeyduociation of Tagoreremonial school, Patha.carite out é notice lou twice-beasedyuiting namesfauticipate in the purposed uten- howedebate, oratorios & elocution contestnames of those who would like to |
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| 8. |
1. Express the following reaction in the form of an equation & then balance it.a)When an aqueous solution of NaOH is added into Ferric sulphate solution,a brown precipitate of Ferric hydroxide is formed along with sodium sulphate.b)Solution of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride.c)Potassium metal reacts with water to give potassium hydroxide and Hydrogen gas. |
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Answer» ??????????????????????????? |
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| 9. |
Classify the substances given in below figure into elements andcompounds |
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| 10. |
Calciumcarbonate reacts with aqueous HCl according tothe reaction:CaCO3(s) + 2HCl(aq.) ®CaCl2(aq.) + CO2(g) + H2O(l)How many moles of CaCO3 is required to react completely with 60ml 0.4Molar HCl? |
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| 11. |
Pls give me answer for this questoin ASAPThe cell wall is present in a plant cell but absent in an animal cell. Justify giving scientific reasons. |
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Answer» PLANT cell needs cell WALL whereas ANIMAL cell do not because the plants NEED rigid structure so that they can GROW up and out . All cells have cell membranes, and the membranes are flexible. So animal cells can have various shapes, but plant cells only have the shapes of their cell walls. |
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| 12. |
Chlorination of water is done(a)to kill harmful germs(b)to make water clear(c)to remove insoluble impurities(d)to make water smell freePlease give me correct answer |
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Answer» a. to kill harmful germs Explanation: PLEASE mark it as BRAINLIEST and follow me |
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| 13. |
तर: सन् दुव्य अलम सलग ही हो' मपनी.अपनी बीमारी । मंग चिघ में रिमांडपरसाई ने इसी ब्ान मंगामडलीउसेरेवादिन कियाइस पाठपाठामार यू टुव मनुभवडेतीन मिनी तो इसप्रडार हैउप अपना अलग मलला घेतारडसिन सरयाने जमी ल्योपास ना इतनी चल जासहीआमाठि ठ ठेक्स भरसडाव इलसे दुखी ही है किाश उसड पाय स्तनऔर आम पनी है उसे श्री टपसब डडउसहै। |
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| 14. |
उल्लाखेत कोई नहींClear my choiceWhat form the data must be entered for the given C code?scanf("%d / %d", &n1,&n2);दिए गए सी कोड के लिए डेटा किस रूप में दर्ज किया जाना चाहिए? स्कैनफ ('%d /% d",&n &n2)Select one: :O A. run-time errorरन-टाइम एररOB.6969OC.4399143991تفحجلنحححمممم |
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Answer» Answer: Types of Natural Resources: RENEWABLE Resources: These are resources such as air, water, and sunlight that REFILL naturally. Non-Renewable Resources: These are resources like fossil fuels and minerals that do not restock REFORM very slowly. Biotic: These originate from living beings and organic material like plants and animals. Abiotic: These come from non-living THINGS and non-organic material. These comprise air, water, and land as well as metals like iron, COPPER, and silver. Natural resources are also categories such as actual #Rehan |
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| 15. |
म 8. सल्फ्यूरिक अम्ल का 02M बिलयन बनाने के लिए 250 मिलीजल में इस अम्लकितने प्राम पोलने पड़ेंगे? |
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Answer» Answer: thanks for five points... Explanation: |
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| 16. |
Write the molecular formulae of the following compounds.1)Potassium Chloride 2)irin Sulphide 3)Hydrogen lodide4) Skdium Chlorids 5) Hydrochloric acid |
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Answer» Answer: A chemical FORMULA is the representation of substance by SYMBOLS and it denotes the number of atoms of each element present in the compound. To write a formula one must know the symbols and VALENCIES of the elements.The VALENCY of Hg=2 and of Cl=1 so the formula is HgCl 2
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दीजिए।The first ionization enthalpy value (A,H) of second period elements Li, Be andCare 520, 899 and 1086 KJ/mol. Predict whether the first AH value will be(1)close to 690 or 990 KJ/mol. Justify your answer. |
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Answer» Answer: l,s SI u V e4nmrtes wki n jan miupopbnbhe 111 POPOR mjabvc xand if y6pouew in an i9pnhline 211 rfw wpor mac X i will geibev you a lihghtn 7U intg d kjye f0bm 0obasrd Explanation: |
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11. The kinetic energy of 4 moles of nitrogen gas at127°C is? cals. (R=2 cal moll K-')A. 4400B. 3200C. 4800D. 1524 |
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| 19. |
The arrangement of orbitals on the basis of energy is based upon their (n+l ) value. Lower thevalue of (n+l), lower is the energy. For orbitals having same values of (n+l), the orbital with lower value of n will have lower energy.8. Based upon the above information, arrange the following orbitals in the increasing order of energy.4s, 3s, 3p, 4d9. Based upon the above information, Which of the following orbitals has the lowest energy?4d,4f,5s,5p10. Which of the following orbitals has the highest energy?5p,5d,5f,6s, |
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Answer» Answer: Lower the value of (n +L), lower is the energy . For orbitals having same value of (n +l), the orbital with lower value of n will have lower energy. ... HENCE, 5s has the LOWEST energy. (b) 5p=5+1=6,5d=5+2=7,5f=5+3=8,6s=6+0=6,6p=6+1=7 Hence, 5f has highest energy. my dear PLEASE love |
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| 20. |
Balance the followingNa Hco3 ) Haz co 3 + H₂ot coA 2-2N a +21-20 > 2Naot + H2ct H₂ sot as co₂ + H₂O + SO2PLCSO 2 + H2O |
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Answer»
Sodium hydrogen carbonate + ACETIC ACID → Sodium acetate + Carbon dioxide + Water Type of Chemical Reaction: For this reaction we have a chemical reaction. Balancing Strategies: In this reaction we have NAHCO3 (baking soda) reacting with an aqueous SOLUTION of HC2H3O2 (vinegar) to form NaC2H3O2 + CO2 + H2O. The bubbles you see when you mix backing soda with vinegar are the CO2 found on the product side of the equation. |
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WRITE THE STRUCTURAL FORMULA FOR PYROGALLOLplease answer it perfectly otherwise I will delete your answer and point you recived. |
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Answer» Pyrogallol/Formula C6H6O3 |
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| 22. |
Mixtures are constituted by more than one kind of pure form of matter . Depending onthe nature of the components that form a mixture , we can have different types of mixtures asHomogenous and heterogenous. Colloidal solutions ,suspensions and true solutions furtherclassify these mixtures. |
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Answer» Answer: Mixtures can be CLASSIFIED on the basis of particle size into three different TYPES: solutions, suspensions, and COLLOIDS. The components of a mixture retain their own physical properties. |
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| 23. |
Htaluate YourselfA Compound on analysis gave thelowingpercentage composition24.47%, H=4.07%, 0-71.65%termine the empirical formula of thempoundle |
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Answer» Explanation: step 1 Divide the GIVEN percentages of atoms with their molecular masses H---4.07/1 =4.07 C---24.27/12 =2.02 Cl--71.65/35.5=2.01 step 2 divide all VALUES with the lowest value obtained. H---4.07/2.01=2 C---2.02/2.01=1 Cl---2.01/2.01=1 therefore the empirical FORMULA is CH 2
Cl WEIGHT OF EMPIRICAL FORMULA=12+2+35.5=49.5 Given molecular weight =98.96 which is double of empirical weight .therefore molecular formula is C 2
H 4
Cl 2
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| 24. |
Find the molecularmolecular formula of the compoundfrom following data per centage_composition of C is 76.6%. H is 6.43% and 0 is 16.97% Molar mass of the compound is94 g/mol |
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Answer» fghkhchg hijjk ftekyrotsoge9txpyzirsotsodiigsl Explanation: bbvřĕę |
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| 25. |
Which of the following can be classified as a heterogeneous mixture?(i) Milk(ii) Sea Water(iii) Ice (iv) Iron Please answer fast please very urgent pls answer quick very very urgent |
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Answer» Answer: MOST PROBABLY MILK |
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| 26. |
(i) Fe,0, + 2A1 → A1,O3 + 2Fe is(a) Combustion reaction(b) Double displacement reaction(c) Displacement reaction(d) Decomposition reaction. |
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| 27. |
) Give a suitable reason for the following statement. [4]a) Valency of phosphorus is -3. b) Magnesium is a metal. c)Neon is a noble gas. d) Gases are highly expansible. |
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Answer» Answer: (a) There are 5 valence electrons in a neutral phosphorus atom. To complete its octet, it gains THREE electrons from a donor atom, so its VALENCY is -3. (b) Magnesium has 2 valence electrons. So, it forms a POSITIVE ion by donating the 2 electrons to complete its octet. So, it is a metal. (c) Noble gases are ELEMENTS which have duplet or octet configuration. As Neon has EC of 1s2 2s2 2p6 and has an octet configuration, it is a noble gas and hence is almost non-reactive. (d) Gases are highly expansible because they have weak inter-molecular forces between their molecules and high inter-molecular distances. Explanation: |
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| 28. |
What do you get if lead is heated with concentrated sulphuric acidwhat products do you expect if lead is heated with NaoH |
Answer» PLEASE MARK me BRAINLIEST ,, HOPE it HELPS |
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| 29. |
8. A negative radical with 1 atom ofsulphur and 3 atoms of Oxygen , alsohaving valency 2can be represented as......... |
Answer» PLEASE TOUCH brianleast answer me please please touch brianleast answer me please please touch brianleast answer me please please touch brianleast answer me please |
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| 30. |
32. Correct order of intermolecular forcesA gas < liquid < solid B. liquid < gas < solidC. gas < liquid < solid D. gas = liquid = solid |
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Answer» a gas right answer |
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| 31. |
Balance the following equaticNaHCO3 → Na2CO3+H2O+CcDC+H2SO4 — CO2+H2O+SO2i 1) PbS+O2 Soz+H2O)S+H2SO4 S02+H2OZnS+O2 → ZnO+SO2 |
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Answer» ccooo 9/.-/* gggt bao TYE awnbneser ANG baho kofdfdfdfdfd Explanation: n nnyushhsjkjjdkeeeoek mdfdfdfdf dfdfdfdfdfdfdfd |
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| 32. |
Write the IUPAC names of the following compoundsCH2--CH2--CH2 | CH2--CH3 |
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Answer» CARBON dioxide Explanation: |
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| 33. |
What was the basis for the earliestattempts done for classification of elements? who suggested the first attemptsof this classification. |
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Answer» the TRAIDS of j.w.Duberine |
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| 34. |
12. Three cubes of a metal whose edges are in the ratio 3:4:5 are melted and converted intoa single cube whose diagonal is 12√3 cm. Find the edges of the three cubes.INCERT EXEMPLAR) |
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Answer» Answer: Let the edges of three cubes be 3X, 4x and 5x respectively. So, the volume of the cube after melting will be = (3x)³ + (4x)³ + (5x)³ = 9x³ + 64x³ + 125x³ = 216x³ Now, let a be the edge of the new cube so formed after melting Then we have, a3 = 216x3 a = 6x We know that, Diagonal of the cube = √(a2 + a2 + a2) = a√3 So, 12√3 = a√3 a = 12 cm x = 12/6 = 2 Thus, the edges of the three cubes are 6 cm, 8 cm and 10 cm respectively.
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| 35. |
Draw the electron dot diagram and structure of:a. Nitrogen moleculeb. Magnesium chlorideC. Methaned. Watere. OxygenCorrect answer will get brainlisted |
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Answer» here is your answer Hope it HELPS you |
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| 36. |
The dilution effect in spectrophotometric titration is minimised by using(i) large concentration of titrand(ii) large concentration of titrant(iii) radiation of 2. between 200 – 400 nm(iv) monochromatic radiations |
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Answer» ഢർഡവ തന്നെ പറയാം എന്ന് വാശി ഞരഢ രസം എൻ വരെ ഡച്ച് ഈസ്റ്റ് റൂം വീടിന്റെ ഒരു തീരുമാനം എടുത്തു വേഗം രമ ജന്മം |
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| 37. |
I. The type of bonding present in metallic chlorides. |
Answer» ionic BONDING is expected in metallic chloride is your answermaybe it's HELPFUL for you ☺️ |
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| 38. |
Q No. 01: Complete and balance the following reactions with procedurea. Pb(NO3)2 +HCI _>b. Na2SO3 + HCI->c. Zn + H2SO4 ->d. AIN + H2O->e. NH3 +3Cl2--> |
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Answer» Explanation: |
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| 39. |
When aqueous solution of silver nitrate and sodium ______chloride are addedColoured precipitate is formed and the reaction is called____Reaction |
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| 40. |
PLS ANSWER THE QUESTION PLS REFRAIN TO WRITE ABSURD ANSWERS |
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Answer» Answer: |
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| 41. |
C Atomic massis of Calculate the molecular Hears of the followingCompounds:Mg.24,0-16, lt-), L-12,9-32ca -40, (1-35.5)а) ,)a) Mg sou by Ca CH (G) ₂ (C) Hcl |
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Answer» Explanation: c Atomic c Atomic mass is of Calculate the molecular HEARS of the following Compounds: Mg .24,0-16, lt-), L-12,9-32 ca -40, (1-35.5) а) ,) a) Mg SOU by Ca CH (G) ₂ (C) Hcl is of Calculate the molecular Hears of the following Compounds: Mg .24,0-16, lt-), L-12,9-32 ca -40, (1-35.5)c Atomic mass is of Calculate the molecular Hears of the following Compounds: Mg .24,0-16, lt-), L-12,9-32 ca -40, (1-35.5) а) ,) a) Mg sou by Ca CH (G) ₂ (C) Hcl а) ,)c Atomic mass is of Calculate the molecular Hears of the following Compounds: Mg .24,0-16, lt-), L-12,9-32 ca -40, (1-35.5) а) ,) a) Mg sou by Ca CH (G) ₂ (C) Hcl a) Mg sou by Ca CH (G) ₂ (C) Hcl |
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| 42. |
On the basis of your understanding of the following paragraph and the related studiedconcepts : [1 x 4 = 4M] Baking soda is used in small amounts for making bread and cakes. It helps to make these soft and spongy . An aqueous solution of baking soda turns red litmus blue. It is also used in soda acid fire extinguisher. Use this information to answer the following questions : 1 Write the equation for the reaction between baking soda and acid.2 What is the reaction involved when it is heated ? |
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| 43. |
Date:Page10,2 gram of magnesiome is burst in a closedvessel containing 1.29 gram of oxygen to producemagnesium oxide.i) Find the limiting reagent .ii)Calculate the number ofmolecules of unreacted reagent left over.iii) What mass of Mgo is produced.IV) How many grams of pure HCL are required to neutralize whole MgO produced. |
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Answer» Answer: ANSWER Balanced reaction is: 2Mg+O
→2MgO According to the reaction 2 mol (or 2×24.3=48.6g) Mg reacts with 32 g oxygen. 1 g of Mg requires = 48.6 32
=0.66g oxygen but GIVEN oxygen is 0.5 g ∴ oxygen is the LIMITING reagent 0.5 g oxygen can burn == 32 48.6
×0.5=0.75g Mg Excess of Mg left =1−0.75=0.25g please follow me or thanks me please |
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| 44. |
6. An elementary particle of matter of agroup of atoms of different elementsbehaves like a single unit with a charge in it.This statement defines which one of these?(1 Point)ProtonRadicalBoth |
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Answer» An atom or GROUP of atoms of the same or of DIFFERENT elements that behave as a single unit with a POSITIVE or negative charge is known as radical. Hence the correct option is B Hope it HELPS you........... |
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| 45. |
Arrange the following alcohols in Increasing order of their reactivity towards.(i) esterification (ii) dehydrationCH3CH2OH, (CH3)2 CH-OH, (CH3)3-C-OH |
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Answer» ykduldsyksksyktkatktaktakatjajtbtvtgeh |
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| 46. |
35. During an experiment the students were asked to prepare a 10% (Mass Mass) solution of sugarin water. Ramesh dissolved 10g of sugar in 100g of water while Sanka prepared bydissolving 10g of sugar in water to make 100g of the solution(a) Are the two solutions of the same concentration?(b) Compare the mass of the two solutions, |
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Answer» no those TWO SOLUTIONS will not have the same CONCENTRATION |
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| 47. |
Concentrated HCL is 12N . What is the volume of concentrated HCL required to prepare 2lit of 4N solutionPlease help with this question |
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Answer» I don' KNOW plzz search on google |
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| 48. |
3.Which of the following crystal does not possessthe cubic closed packed arrangement?B. Ag!D. HgsA CulC) Csi |
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Answer» Answer: JAB tumhe JINDAGI me koi raasta dikayi na dekoi manzil dikayi naa De koi AAPNA dikayi naa detab NERE sath aana ham EYE SPECIALIST'''''''ke pass chalenge""""" --------------------------------- |
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| 49. |
Write the full form of IUPAC name the the elements represented by the following au pb sn hg |
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| 50. |
-90n =Molecular massEmpirical massMolecular formula of the compound is C2H204.= 2.45PRACTICE PROBLEMS1. Calculate the (a) empirical formula, and (b) molecular formula of a compound having the following percentage composition:Sodium 42.1%, phosphorus 18.9% and oxygen = 39.%. Given that the molecular mass of the compound is 164.(Na = 23, P = 31 and O = 16][Ans: (a) Na3PO, (b) Na3PO4]2. Urea is a very important nitrogenous fertiliser and has the molecular formula NH CONH2. Calculate the percentage ofnitrogen in urea.[Ans: 46.67%]3. A hydride of nitrogen contains 87.5% by mass of nitrogen. Determine its empirical formula.[Ans: NH2]4. 0.24 g sample of a compound of oxygen and boron was found by analysis to contain 0.096 g of boron and 0.144 g ofoxygen. Calculate the percentage composition of the compound by mass.[Ans: Boron = 40%; Oxygen 60%]5. Calculate the percentage of oxygen in K2Cr2O7. [K = 39, Cr = 52 and 0 = 16][Ans: 38.09%]6. Calculate, correct to one decimal point, the percentage of platinum in ammonium chloroplatinate ((NH4)2PtCl.).[Pt = 195, N = 14, H = 1 and Cl = 35.5][Ans: 43.9%]7. Calculate the empirical formula of a compound having the following percentage composition: K = 47.9%, Be = 5.5% andF = 46.6% by mass. [Be = 9, F = 19 and K = 39][Ans: K,BeF]8. A metal M forms a volatile chloride containing 65.5% chlorine. If the density of the chloride relative to hydrogen, i.e., VDis 162.5, find the molecular formula of the chloride. [M = 56 and Cl = 35.5).[Ans: M2016]9. In an experiment, 6.21 g of lead combines with 4.26 g of chlorine. What is the empirical formula of the chloride of leadmetal? [Pb = 207 and Cl = 35.5](Ans: Pbcla10. An organic compound with vapour density 94 contains C = 12.67%, H = 2.1% and Br = 85.11%. Find its molecular formula(C = 12, H = 1 and Br = 80][Ans: C2H4Br2) |
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Answer» sjtfcszoue come WOMEN |
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