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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. |
Magnesium metal, rutile (TiO2), and quartz (SiO2) are mixed together in a 3:1:1 molar ratio, and heated by a plasma torch in the absence of air. Two phases are produced. The first is a “metal” phase consisting of titanium silicide (TiSi) and elemental silicon (Si), which has an verall analysis of 57%mass Ti. The second is a slag containing forsterite (Mg2SiO4), magnesium or-thotitanate (Mg2TiO4), and periclase (MgO).Determine:a. Mass of titanium silicide produced per kilogram of charge [Note: mass of charge = total mass of all reactants].b. The mass percent of titanium in the slagProcess reaction: m Mg + n TiO2 + p SiO2 = [x TiSi + y Si] + [a Mg2SiO4 + b Mg2TiO4 + c MgO] |
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Answer» Magnesium metal, rutile (TIO2), and quartz (SiO2) are mixed together in a 3:1:1 molar ratio, and heated by a plasma torch in the absence of air. Two phases are produced. The first is a “metal” phase consisting of titanium silicide (TiSi) and ELEMENTAL silicon (Si), which has an verall analysis of 57%mass Ti. The SECOND is a SLAG containing forsterite (Mg2SiO4), magnesium or-thotitanate (Mg2TiO4), and periclase (MgO). Determine: a. Mass of titanium silicide produced per kilogram of charge [Note: mass of charge = total mass of all reactants]. b. The mass percent of titanium in the slag Process reaction: m Mg + n TiO2 + p SiO2 = [x TiSi + y Si] + [a Mg2SiO4 + b Mg2TiO4 + c MgO] Explanation: sorry can't answer such a big question |
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| 2. |
The emf of the cell obtained by coupling an electrode with SHE was 1.37V.If SHE is the positive electrode, find the potential of the given electrode.please give answer.This is based on plus two chemistry. |
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Answer» Answer: as electrode potential of SHE is ARBITRARILY taken as zero oxidation or reduction may take place on it depending UPON the electrode CONNECTED with it.if SHE is +ve then oxidation is taking place on it. and reduction is taking place on other electrode and its(connected electrode) potential will be +1.37V and it lies below SHE in ELECTROCHEMICAL series GIVEN in reduction mode |
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| 3. |
Identify the substance/s-(i) in which the inter-particle attraction is weakest. (ii)that does not have a fixed shape but has a fixed volume. (iii) in which the particles are closely packed together. |
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Answer» So easy peasy ☺ 1) gas 2) liquid |
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| 4. |
Calculate molar mass of ZnO , Na2O , K2CO3Given atomic mass of Zn = 65 u ; Na =23 ; k =39 ; C =12 and O =16 u |
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Answer» decorate karna Tumne DE sakte ho BINA BAAT ka ka kam ka time KAR RAHE ho |
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| 5. |
जब अम्ल धातु कार्बोनेट या हाइड्रोजनकार्बोनेट के साथ अभिक्रिया करता है तो लवण ,गैस एवं एक उत्पाद बनता है उस उत्पाद एवं गैस का नाम बताइए।क) कार्बनडाइऑक्साइड , पानीख) हाइड्रोजन, लवणग) कार्बनडाईऑक्साइड ,लवण घ)उपरोक्त सभी |
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Answer» sorry can't UNDERSTAND MARK me as a brainlest answer sorry can't understand mark me as a brainlest answer sorry can't understand mark me as a brainlest answer |
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| 6. |
In a hypothetical atom the number of electrons in shell and subshell are x and y respectively where each electron has three possible spin states represented as s = +1/2,-1/2 and 0 . then the value of x + y |
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Answer» FIRST WRITE THE QUESTION PROPERLY Explanation: PLEASE MARK AS BRAINLIST࿐ |
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| 7. |
A nonmetal X is present in two forms in nature P and Q.P is the hardest element and Q is a good conductor of electricity. X when burnt in air forms an oxide Y.Y dissolved in water forms Z. Identify X,P,Q,Y,Z and write the chemical reactions supporting your answers. What will be the action on litmus by the compound Z? |
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Answer» Answer: x=carbon, a NON metal p=diamond or ALLOTROPE form of carbon q=is graphite ,the only nonmetallic ELECTRICAL conductor |
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| 8. |
What happens to the resistivity of a wire if it is stretchedoption(1) it will increase (2) it will decrease (3) first increase than decrease (4) remains the same |
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Answer» when it's is stretched it's CROSS sectional area will DECREASE and it RESISTIVITY will increase |
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| 9. |
10H)₂+()b) Ni2+a) N:d) Cd?214(aq) + Bra()2Br(aq)+12(8)b) The l'ion is oxidized, and its oxidation number decreasesc) The l' ion is reduced, and its oxidation number increasesd) The lion is reduced, and its oxidation number decreasesWhat species is oxidized during the discharge of the batter46. Given the redox reaction:What occurs during this reaction?a) The l' ion is oxidized, and its oxidation number increases |
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Answer» Answer: What is the OXIDATION number of nitrogen in the NO A)- ion? B)+1 C) +2 D) +5 E) +7 7) The reduction half reaction occurring in the STANDARD hydrogen electrode is A) H2 (g. 1 atm) B) 2H (aq) + 20H H20 () 2H (aq, 1M)+2e C) 02 (g)+4H (aq)+ 4E D) 2H (aq, IM) 2e E) 2H (aq, IM) + Cl2 (aq) 2H20 ) H2 (g. 1 atm) 2HCI (aq) 8) In a voltaic cell, electrons flow from the A) salt bride, anode B) anode, salt bridge C) cathode, anode D) salt bridge, cathode E) anode, cathode to the 9) Which of the following reactions is a redox reaction? D K2CrO4BaCl2 (II) Pb22+ +2Br 2PbBr (III) Cu +S CuS BaCrO4 + 2KCI E) (II) and (III) D) () and (II) B) (II) only C) (III) only A) (I) only 10) Which of the halogens below is the strongest oxidizing agent? A) Cl2 E) All of the healogens have equal strength as oxidizing agents. D) 12 C) F2 B) Br2 11) All of the following have free energy values of zero except A) H2 (g) D) Fe (s) E) Na (s) C) He (g) B) N (g) 12) Consider an electrochemical cell based on the reaction: 2H+ (aq) Sn2+ (aq) H2 (g) Snsalt bridge, cathode E) anode, cathode to the 9) Which of the following reactions is a redox reaction? D K2CrO4BaCl2 (II) Pb22+ +2Br 2PbBr (III) Cu +S CuS BaCrO4 + 2KCI E) (II) and (III) D) () and (II) B) (II) only C) (III) only A) (I) only 10) Which of the halogens below is the strongest oxidizing agent? A) Cl2 E) All of the healogens have equal strength as oxidizing agents. D) 12 C) F2 B) Br2 11) All of the following have free energy values of zero except A) H2 (g) D) Fe (s) E) Na (s) C) He (g) B) N (g) 12) Consider an electrochemical cell based on the reaction: 2H+ (aq) Sn2+ (aq) H2 (g) Sn (s) Which of the following actions would change the measured cell potential? A) increasing the pH in the cathode compartment B) lowering the pH in the cathode compartment: C) increasing the [Sn2+] in the anode compartment D) increasing the pressure of hydrogen gas in the cathode compartment E) Any of the above will change the measure cell potential. 13) One of the differences between a voltaic cell and an electrolytic cell is that in an electrolytic cell.... A) an electric current is produced bya chemical reaction B) electrons flow toward the anode C) a nonspontaneous reaction is forced to occur D) 02 gas is produced at the cathode E) oxidation occurs at the cathode |
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| 10. |
Why is the Evalue for the Mn* /Mncouple much more positivethan that for Cr**/Cr? or Fe**/Fe2'? Explain. |
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Answer» Answer: The E° VALUE for the Mn3+/Mn2+ couple much more positive than that for Cr3+/Cr2+ or Fe3+/Fe2+. Much more third IONISATION energy of Mn (where the required change is d5 to d4) is MAINLY responsible for this. This also explains why the +3 state of Mn is of little importance. I hope that this answer will HELP you |
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| 11. |
Fe++2hcl→ Fecl2+H2What is oxidised reaction |
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Answer» plz tell me what's your QUESTION in the REACTION we will do the BALANCE to oxided reaction or in the equation searchs oxided reaction plz TELL me Explanation: tell me what's your question plz |
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| 12. |
In which group would u locatethe element having electronic configuration 2,7 in mordern perodic table |
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| 13. |
Find the incorrect trend for alkaline earth metals *(a) atomic size Be < Mg < Ca < Sr(b) second ionization energy Be < Mg < Ca < Sr(c) Hydration enthalpy Sr < Ca < Mg < Be(d) Density Ca < Mg < Be < Sr |
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Answer» Answer: Option B Explanation: as ionisation energy decreases down the group DUE to addition of shell but in option b it is showing that it is increasing so option b is the incorrect trends of ALKALINE EARTH metal |
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| 14. |
The emf of the cell obtained by coupling an electrode with SHE was 1.37v .If SHE is the positive electrode, find the potential of the given electrode. |
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Answer» Answer: A SHOPKEEPER bought 50 ENGLISH books at the COST of rupees 2000 per 25 books and 75 Mathematics books at the cost of rupees 1500 per 15 books. Find: (a) The cost PRICE of the English books. (b) The cost price of the Mathematics books. (c) The cost price of all English and Mathematics books. (d) If he SOLD the English books at rupees 95 per book, find his profit in English books. (e) If he sold the Mathematics books at rupees 95 per book, find his profit or loss in Mathematics books. |
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| 15. |
10 ml of NaHC20. solution is neutralized by 10 ml of 0.1 M NaOH 10 ml of same NaHC,0solution is oxidized by 10 ml of KMnO4 solution in acidic medium. Hence, molarity of KMnO, is(A) 0.1 M(B) 0.2M(C) 0.04 M(D) 0.02 M |
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Answer» D a is the CURRET answer |
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| 16. |
Give reasons: a) Aqueous solution of NaCl conducts electricity whereas solid NaCl does not.b) Metals like sodium, potassium and lithium are stored under kerosene oil. |
Answer»
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| 17. |
O 00:08:26Addition of HBr gives same 2006product in the presence orabsence of peroxide whenalkene is1-butene02-methylpropeneO propene02-butene |
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Answer» SORRY does not andeste |
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| 18. |
The tendency to lose their valance electron easily by alkali metals makes them(a) strong reducing agent(b) weak reducing agent(c) strong oxidising agent(d) weak oxidising agent |
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Answer» Answer: The most reactive kind of metallic ELEMENT is an ALKALI metal of group 1 (e.g., sodium or potassium); this is because such an atom has only a SINGLE valence electron; during the FORMATION of an ionic bond which provides the necessary ionization energy, this one valence electron is easily lost to form a positive ION |
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| 19. |
• The osmatic pressure of solution at 0 degree centigrateis 4atm. What will be osmatic pressureat 546k under similar conditions- |
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| 20. |
Calculate the bond length of HCI molecule, if itsmoment of inertia is 2.71 x 10^-40 g cm² and reducedmass is 1.63 x 10^-24g. |
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Answer» Answer: CALCULATE the bond lenght of hcl molecule if its MOMENT of inertia is 2.71 ×10 10 invers gmcm squar and REDUCE mass 1.63× 10 invers 34 g |
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| 21. |
223.Copper metal rects with conctrated HNO, asCu + 4HNO, Cu(NO3), + 2NO, + 2H,0.The number of moles of the HNO, reducedby one mole of the Cu will be1) 4 2) 2 3) 0.5 4) 0.25 |
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Answer» Answer: shdvdhs SIS z xhzsnud dhdbdjdbdh chxbsudbzu dhz GX xhxbxuvxuz xusbsyd YC chs u CJE jz vj sbss shd zvssibshs susuzbdosvsjx osvsid. did xbx x |
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| 22. |
S11. કારણ આપો ઓક્સિજનનીપ્રથમ આયનીકરણ એન્થાપીનું મુલ્ય નાઈટ્રોજનની પ્રથમ આયનીકરણએન્થાપીનાં મુલ્ય કરતા ઓછુ છે. |
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Answer» !$;$+$+$7_+3;_+'+_8$83737_73 Explanation: ";";"+$+$+$7$74+4+$83+;_7'$()@#)[email PROTECTED]";"+$82839955838 |
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| 23. |
Draw a neat labelled diagram of Water purification system inwater works.PLEASE FAST........ |
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| 24. |
Which of the 3d series of the transition metals exhibits thelargest number of oxidation states and why? |
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Answer» Answer: please mark me as brainlist... follow me..like and rate my answer Explanation: Manganese exhibit the largest number of oxidation states. It shows the oxidation states +2, +3, +4, +5 ,+6, and + 7. The reason for that is the MAXIMUM number of unpaired ELECTRONS PRESENT in its OUTERMOST shell i.e. 3d54s2.Jun 26, 2014 |
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| 25. |
A metal X forms coloured ions, is paramagneticand is used as a catalyst. Predict the block to which the metal belongs |
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Answer» it Is copper Explanation: |
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| 26. |
23. નીચેના દાખલા ગણો.(a) n=6માંથી ધરા અવસ્થામાં ઈલેક્ટ્રોન દાખલ થાય ત્યારે ઉત્સજીત રેખાઓની મહત્તમ સંખ્યા કેટલી હશે?(b) પરમાણ્વીય હાઈડ્રોજનની બામર શ્રેણીમાની સૌથી લાંબી સંક્રમણ માટેની તરંગસંખ્યા (તરંગક) ગણો. |
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| 27. |
Kinetic energy of photoelectrons emitted when a light of energy 12 J isincident on a metal surface with work function 8.68 J, is |
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Answer» Answer: 3.32 J 20.68 J -3.32 J -20.68 J |
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| 28. |
Draw a neat labelled diagramof a separating funnel toillustrate the separation of a mixture of water and kerosene.PLEASE FAST......... |
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| 29. |
23. નીચના દાખલા ગણો.(a) n=6માંથી ધરા અવસ્થામાં ઈલેક્ટ્રોન દાખલ થાય ત્યારે ઉત્સર્જીત રેખાઓની મહત્તમ સંખ્યા કેટલી હશે?(b) પરમાણ્વીય હાઈડ્રોજનની બામર શ્રેણીમાની સૌથી લાંબી સંક્રમણ માટેની તરંગસંખ્યા (તરંગક) ગણો |
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Answer» (a) n=6માંથી ધરા અવસ્થામાં ઈલેક્ટ્રોન દાખલ થાય ત્યારે ઉત્સર્જીત રેખાઓની મહત્તમ સંખ્યા કેટલી હશે? |
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| 30. |
Draw a neat labelled diagram of distillation / fractionaldistillation to illustrate the separation of two miscible liquids.PLEASE FAST, AND IF YOU KNOW THE ANSWER SO PLEASE THEN ONLY ANSWER OR ELSE I WILL REPORT YOUR ANSWER...................... |
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Answer» PLEASE MARK me as BRAINLIEST |
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| 31. |
Which oxide is amphoteric? *(a) BaO(b) CaO(c) BeO(d) MgO |
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Answer» Explanation: |
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| 32. |
22. એક સંયોજન 4.07% Hi, 24.7 C અને 71.65% Cી ધરાવે છે. તેનું મોલર દળ 98.96 gm છે. તેનાપ્રમાણસૂચક અને આવીય સુત્રો તારવો |
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Answer» Answer: 5/9*7 is your ANSWERS mate PLEASE MARK me brainliest and follow me |
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| 33. |
2.23 (i) નીચેના આયનોના ઇલેક્ટ્રૉનીય બંધારણ લખો :(a) H (b) Na* (e) 02 (1) F,(i) જો તત્ત્વના સૌથી બહારના ઇલેક્ટ્રૉનને (a) 3s' (b) 2p અને (c) 3p” તરીકે દર્શાવી શકતાહોઈએ તો તે તત્ત્વોના પરમાણ્વીય-ક્રમાંક કેટલા હશે ?(i) નીચેની રચના ક્યા પરમાણુના સંકેત છે ?(a) [he] 2s' (b) [Ne] 352 3p (e) [Ar] 452 3d', |
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Answer» Answer: |
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| 34. |
Which one is the most stable carbonate? *(a) BaCO3(b) MgCO3(c) CaCO3(d) BeCO3 |
Answer» (a)BaCO3BaCO3 is more thermally stable because POLARISING POWER of Ba2+ is less than other alkaline EARTH metals and thermal stability is INVERSELY PROPORTIONAL to polarising power of action when compound containing polyatomic anion and here carbonate is polyatomic anion. |
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| 35. |
2218. (a) What is meant by "atomic number of an element(b) Complete the table given below:No. ofNo. ofNo. of Atomic MassProtons Electrons Neutrons number number351737013717(C) Write down the electronic configuration of (1) chlorineatom (ii) chloride ion. |
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Answer» Answer: a) atomic number of ELEMENT REFERS to the number of PROTONS present in the nucleus of the cell b) 1)no. of protons=17 no. of electron=17 no. of nutrons=18 atomic no.=17 mass no.=35 2)no. of protons=17 no. of electron=17 no. of nutrons=20 atomic no.=17 mass no.=37 c)1) electronic configuration of cl=2,7 2)electronic configurations of cl-=2,8 |
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| 36. |
1g molecule of V205 contains :5 mole of oxygen atom2 mole of v atom1 mole of oxygen atom2.5 mole of oxygen atom |
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| 37. |
Which of the ions have maximum hydration energy? *(a) Sr2+(b) Ca2+(c) Mg2+(d) Be2+ |
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Answer» d )is your answer |
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| 38. |
Complete the following sequences by writing the structural formula of the organic compoundsA, B and C.Isopropyl alcohol..? |
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Answer» Answer: C3H8O Isopropyl alcohol/Formula Explanation: Aldehyde and ketone form alcohol with the GRIGNARD reagent.A s a secondary alcohol is formed with a 3 CARBON chain A is propanal. 2-butanol is secondary alcohol and on dehydration, with H 2
SO 4
will form BUTENE. the MAJOR product is B, trans- 2-butene which forms addition product bromine2,3-bromobutane (c). This forms 2-bromo but 2-ene (D) on reaction with alcoholic KOH. |
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| 39. |
NO12. Complete the following table:isotopes Atomic MassNumber NumberProtiumDeuteriumNo. ofElectronsNo. ofProtonschloride |
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Answer» Im confused Explanation: The number of nitrogen and HYDROGEN ATOMS are equal in both the reactant and PRODUCT sides. This is because of LAW of conservation of matter. This is done by balancing the equation N2 + H2 = NH3 |
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| 40. |
Which of thethe statementesabout the reaction below areincorrect ? 2Pho(s) + C(s)=2Pb(s) +Co2 (g)la and its headine getting reducedcarlion droned in gettingCarlon is getting oxeluedI heard oud is getting reducedis getting reducedla amba andaa bande2 |
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Answer» Nature FULFILS and motivates. Nature whispers and commands. Are you LISTENING ???????? When I do ,it COMPLETELY leaves me in ..... ..... |
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| 41. |
Which compound is most basic out of watermethanehydrogen sulphideammonia |
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| 42. |
Write chemical equations for the following chemical reactions. Write the name(s) of the product in each case .List the observation which is unique in any reaction.a) Steam is passed over iron. b) Aluminum heated in air. |
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Answer» Answer: a) H2 O(steam)+ FE(IRON) produce iron oxide) B) Al+O2 produce Al2O2 |
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| 43. |
4The number of atoms present in 142g of Chlorine is1) 6x 10232) 1.2x10243)2.4x10244)3.6*1024 |
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Answer» Answer: 3 Explanation: ................... |
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| 44. |
If 1(1/2)mole of oxygen combined with aluminium metal to form aluminum oxide, the weight of aluminum metalused in grams is (at .wt. of Al = 27) |
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Answer» Explanation: 2Al+ 3
O 2
→Al 2
O 3
2 3
molO 2
1mol O 2
requires 3 2×2
molAl 2 1
mol O 2
requires 3 4
× 2 1
molAl = 3 2
mol = 3 2
×27=18gm aluminum. Hence, option B is correct. |
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| 45. |
Balance the following equation by oxidationnumber method inacidic medium.C802 - (an)(aq) + soz (da) -2-3+(cr(aq) + Soy²G) |
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Answer» ffjsguuhfdfhjdgudhkjd |
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| 46. |
एक मोनोबेसिक अम्ल का 0-01Nविलयन 10% वियोजित होता है. अम्लका वियोजन नियतांक होना-(A)1-11x10-(B)3-7x10-2(C)2-19x10-3(D) 1-91x10-7 |
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Answer» SORRY can't understand mark me as a BRAINLEST answer sorry can't understand mark me as a brainlest answer sorry can't understand mark me as a brainlest answer |
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| 47. |
8. From the symbol 35/17 CI for the element chlorine write down the atomic number and mass number of chlorine. |
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Answer» What Is This Is This A QUESTION |
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| 48. |
According to which law different proportion of oxygen exist in oxides of Nitrogen ?(A) Law of constant composition(B) Law of combining weight(C) Law of multiple proportion(D) None of these74.5 g metal chloride contain 355 g chlorine. |
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Answer» OPTION c Explanation: law of MULTIPLE proportions. HOPE this helps:) |
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| 49. |
The valency of iron in Fe2(SO4)3 is ??A.) +2B.) +1C.) +3D.) +4 |
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Answer» Explanation: the VALENCY of Fe in this is 3 |
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| 50. |
What is the IUPAC name of the following compounda) CH3CH2OCH2CHCH3CH3 |
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Answer» HEXANOL(c6h14o) IUPAC NAME for CH3CH2OCH2CHCH3CH3 is hexanol |
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