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.
| 45001. |
what are the fundamental particles of the atom?Among these which one is heaviest and which one is lightest? which one is neutral, which one is positive and which one is negative? |
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Answer» it can help you follow meExplanation:To its CREDIT, the Bohr Model shows where electrons have the highest probability of being at any GIVEN MOMENT, so while the electron CLOUD model is the most accurate way to depict an atom with SIMPLICITY, it doesn't make the other options useless. |
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| 45002. |
4×6.022×10 raise23 chlorine molecules at STP are taken. What is the volume of STP |
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Answer» :Volume of 4 × 6.022 × 10²³ CHLORINE molecules at STP.Calculation:First we need to calculate the total MOLES of chlorine molecules present in the system;Now , we know that 1 mole of any GAS at STP will have a volume of 22.4 L ;So, net volume of Chlorine gas :So, FINAL answer is: |
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| 45003. |
For the complex (Cr(C2O4)2(H2O2)- the oxidation number of Cr is____and the coordination number of a Cr is___ |
| Answer» OXIDATION number of Cr is +3, coordination number of Cr is 6Explanation:Here is your ANSWER Hope it HELP you ❤️ | |
| 45004. |
The number of atoms present in 628u of He (atomic mass of He:4u) |
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Answer» Solution He = ?atomic mass unit ( amu) = 4 gram 1AMU = 1/NA gm628 amu = ?4gr = 1 mole628 amu of He = 628 ÷ 4 = 157 |
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| 45005. |
Sulphuric acid reacts with sodium hydroxide as follows :H2SO4 + 2NaOH ⎯→ Na2SO4 + 2H2O When 1L of 0.1M sulphuric acid solution is allowed to react with 1L of 0.1M sodium hydroxide solution, the molarity in the solution obtained is |
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Answer» tion:Moles of H2S04 TAKEN = 0.1 molesMoles of NaOH taken = 0.1 molesAs H2S04 and NaOH react in ratio 1:2, so 0.1 moles of H2S04 REACTS with 0.2 mole of NaOH which we don’t have.0.1 mole of NaOH reacts with 0.05 mole of H2S04, so NaOH is Limiting Reactant. PRODUCT is calculated w.r.t limiting reactant so Number of moles of Na2S04 formed will also be equal to 0.05.Mass of Na2S04=0.05×142=7.1gpls mark 3 |
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| 45006. |
When EMR of frequency 5×10¹⁵ hz fall on a metal surface, the maximum kinetic energy of photoelectron is double than the photoelectron which emits when EMR of frequency 3×10¹⁵ hz fall on the Same metal. The threshold frequency for the metal is? |
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Answer» I. LOVE uExplanation: |
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| 45007. |
How to convert calcium carbide into ethyne |
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Answer» To CONVERT calcium carbide to ETHYNE, the REACTANT must be treated with WATER. As a result of displacement reaction, it leads gets converted into ethyne and calcium hydroxide.Explanation:hope it's HELP u..thanks u..have a nice day |
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| 45008. |
The number of standing waves of electrons in flourine atom is |
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Answer» தயவு. இந்த வழக்கில் கைது செய்யப்பட்டுள்ள பாதுகாப்பு, , இந்த வழக்கில் கைது செய்யப்பட்டுள்ள பாதுகாப்பு, , இந்த |
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| 45009. |
An masselementhasitais thearrangementStateatomai numbernombesis 23, whatelectrons in thecompositionofelementShellsatona onucleas ofthe |
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| 45010. |
OL 11:6 The wonder waal'constant fora gasis a =0.2latm l² b=0.0171 l mol calculate inversiontemprature of gas |
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Answer» adjidjfhfdjejrjdjdidueueu |
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| 45011. |
a) How are emulsions different from gels? Give example for each. b) Why does solution of sodium chloride not show Tyndall effect whereas the mixture of water and milk shows? |
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Answer» a)Emulsion is a mixture ofmutually INSOLUBLE liquids in which one is dispersed in DROPLETS throughout the other. Gel is a solid jellylike colloid. Emulsion is a mixture of mutually insoluble liquids in which one is dispersed in droplets throughout the other. Gel is a solid jellylike colloid.b)ACTUALLY NACL does not show tyndall effect because it forms a true solution whereas mixture of milk and WATER show because they form colloidal solution.Kindly mark me as brainliest...plzzzzhope u like my answer.. |
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| 45012. |
The poly bags carelessly thrown here and there are responsible for the drains, |
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Answer» AccumulatingPLEASE, MARK ME AS BRAINLIAST! |
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| 45013. |
An array of colours obtained in chromatography is called _________. |
| Answer» DIODE arrayhope it HELPS... | |
| 45014. |
Calculation of the oxidation state of copper in cuprus oxide |
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Answer» An example of a +2 OXIDATION STATE is CuO, where oxygen has an oxidation NUMBER of -2 and therefore COPPER has the oxidation number of +2 to balance out the MOLECULE. An example of a +1 oxidation state is Cu2O, where, once again, oxygen's oxidation state is -2 and so to balance out the molecule, each copper atom is +1. Follow Me ❤❤ |
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| 45015. |
Nestions1. Convert the following temperature to Celsius scale300 k |
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Answer» it will be 300-273=27k |
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| 45017. |
picture of earth collected by satellites in space Image: satellite image a aerial picture b satellite image c photograph d space shot |
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Answer» tion:collected by satellites in space Image: SATELLITE image a AERIAL picture b satellite image C PHOTOGRAPH d space |
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| 45020. |
Two scientists work together on an experiment, but they have different hypotheses. When the scientists look at the experimental results, they interpret the data in different ways and come to different conclusions. Which of the following does this situation best illustrate? |
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Answer» Interpreting the results of the lab 1)Go BACK to the statement of hypothesis in the Introduction. Then review your findings, the data from the experiment. MAKE a JUDGMENT about whether or not the hypothesis has been supported. ... 2)Write a statement stating your judgment. There are three possible judgments you can make: The key assumption in science is that experimental results can be produced because nature behaves in a CONSISTENT manner. Why do scientists assume that experimental results can be produced? Because nature behaves in a consistent manner.Kindly mark me as brainliest...plzzzzhope u like my answer.... |
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| 45021. |
Solve this and only give correct answer please |
| Answer» 1ST is the ANSWERMARK As BRAINLIEST | |
| 45022. |
The energy of electrogeentic radiation is X eV quanta.The wavelength of radiation about |
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Answer» any one subscribe my you tube CHANNEL please please please if you subscribe i will follow you i PROMISE channel name is ALKA if no posts are there so WRITE kala HI sohana nhi dance by alka |
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| 45023. |
If 60g of sugar is dissolved in 200g water what will be the total mass of sugar water solution?Name the law on which calculation is based Chemistry |
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Answer» A solution contains 20g of sugar dissolved in 180G water calculate the ... Total Mass Of The Solution= 180g + 20g = 200g. Therefore, mass by mass PERCENTAGE of the solution = Mass of the SOLUTE / Total mass of Solution x 100Henry's lawKindly MARK me as brainliest.....plzzzhope u LIKE my answer... |
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| 45024. |
Explain the following terms with examples: Combination reaction |
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Answer» __The reactants, A and B, combine to form a new SINGLE PRODUCT, AB, which is always a compound. An example of a combination reaction is when hydrogen and chlorine REACT to form hydrochloric acid: The SUBSCRIPTS in the chemical reaction in this image refer to the states of matter.♥️Mark my answer as brainliest. |
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| 45025. |
800g of a 40 solution contains 200g of potassium nitrate dissolved in it.calculate the concentration of the solution |
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Answer» fjfjfkfnfmfnnnnnnfjfjfjfjfjjjjjjffffjffffffjfjfjfjfjfkfkfkgktkt fkfkfkfkfkfkfkfkgkgkgmkfmgkgkfgfjfjgkfkfkfoccExplanation:CUZ I ififigiitot ozizotptptptpttltltkglgggggglllllltttt mfmgkgkkkkkkkkggggkgkgkgkgkgkgkkgkgkgkgkgkgkgkgkggggkkkkkkggggg |
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| 45026. |
2. The ratio of H:O by mass in hydrogen peroxide (H2O2) is (a) 16 : 1 (b) 1 : 8 (c) 1 : 32 (d) 1 : 16 |
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Answer» tion:Hydrogen and OXYGEN are combined in the RATIO 1: 16 by mass in hydrogen PEROXIDE. |
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| 45028. |
Please give me this answer of chemistry. |
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| 45030. |
How you can say that non metallic oxides are acidic give an example . |
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Answer» tion:Silicon, phosphorus, sulfur, and chlorine oxides are acidic. Some non-metal oxides, such as nitrous oxide (N2O) and carbon monoxide (CO), do not display any acid/base characteristics. Acidic oxides can ALSO react with basic oxides to produce SALTS of oxoanions: 2 MgO + SIO2 → Mg2SiO.there thts the answer .... to be frank I searched google |
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| 45031. |
A weak monobune add 12% dissociated in 0.05 M solution, what percent dissociation in 0 15 X solution. |
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Answer» Dissociation CONSTANT of ACID K a =Cα 2 =0.01×(0.05) 2 =2.5×10 −5 K a =Cα 2 2.5×10 −5 =0.05×α 2 α=0.0223We know that, α= ∧ m∞ ∧ MC 0.0223= 4×10 −2 ∧ mc ∧ mc =8.92×10 −4 ohm −1 cm 2 MOL −1 |
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| 45032. |
How many oxygen atoms are there in Ba3(PO4)2 in 6.025g .{Ba =137 , p= 31} ?Solved Will Get Brainliest Answer |
| Answer» 137 and P = 31 Then OXYGEN ATOM will be 22561132 | |
| 45033. |
Atomic mass in full detail. |
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Answer» ic mass (symbol: ma) is the mass of a single ATOM of a CHEMICAL ELEMENT. It includes the masses of the 3 subatomic particles that make up an atom: protons, NEUTRONS and electrons. Atomic mass can be expressed in grams.Hope it helps buddy❣❣✨✨ |
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| 45034. |
What is meant by atomic mass unit (amu).. Please tell me the answer... |
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Answer» a unit of MASS used to express atomic and molecular weights, EQUAL to ONE TWELFTH of the mass of an atom of carbon-12..Mark me as brainliest and follow me ✌️...TAMANNA 073 |
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| 45035. |
Iron (Fe) + Oxygen (O²) + Water (H²O) --> ? Magnesium (Mg) + Oxygen (O²) --> ? प्लीज जल्दी बताओ |
| Answer» TION:FE + O₂ + H₂o -------> Fe₂O₃ + H₂Mg + O₂ -----------> Mg₂O₃ | |
| 45036. |
Iron (Fe) + Oxygen (O²) + Water (H²O) --> ? Magnesium (Mg) + Oxygen (O²) --> केमिस्ट्री है |
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Answer» in this images ur answer is thereExplanation:hope it will HELP U....PLZZ mark BRAINLIEST... |
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| 45037. |
Iron (Fe) + Oxygen (O²) + Water (H²O) --> ? Magnesium (Mg) + Oxygen (O²) --> ? जल्दी बताओ मियां भाई |
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Answer» after REACTION FOLLOWING PRODUCTS will formExplanation:1)FE(OH)22)MgO |
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| 45038. |
Iron (Fe) + Oxygen (O²) + Water (H²O) --> ? Magnesium (Mg) + Oxygen (O²) --> ? |
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Answer» Fe+O2+H20=Fe203(ferric oxide and RUST)MG +O2=MgO2(Magnesium oxide)plz MARK me as BRAINLIEST |
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| 45039. |
Write word equation for the thermal decomposition: a) Zinc hydroxide----->b) Copper Nitrate ------>pls give it step by step this question is for (5m) I'm giving online exam I need it quick pls |
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Answer» tion:a) ZINC hydroxide----> zinc OXIDE+ WATERB) copper nitrate---->Cupric oxide+nitrogen dioxide+oxygen |
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| 45040. |
Alcohols polar or nonpolar how |
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Answer» The alcohol (-OH) group dominates the molecule making it definitely POLAR. The electrostatic potential clearly shows that the oxygen is partially negative WHEREAS the CARBON and hydrogens are partially positive. PROPANOL is a about EQUAL polar and non-polar molecule: See graphic on the left. |
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| 45041. |
The unit cell of metallic silver Volume of Ag atom is 144.4pm (1) The percent of the empty space |
| Answer» GIVEN, ATOMIC mass of SILVER =108u Atomic cell length, a=4.077×10 −8 cm Atomic radius in FCC, r= 4 a 2 = 4 4.077×10 −8 2 =1.44×10 −8 cm\ Each silver unit cell contains 4 atom. Density = N A ×a 3 4×atomicmassofsilver = 6.02×10 23 ×(4.077×10 −10 ) 3 4×108 =10589.25kgm −3 Hence, atomic radius 1.44×10 −8 cm and density is 10589.25kgm −3 | |
| 45042. |
17. State the condition under which the following metals react with water. Write equation for each reaction. |
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Answer» Some metals react with water to FORM metal hydroxide and hydrogen gas.Some metals react with water to form metal hydroxide and hydrogen gas.2Na(SODIUM)+2H Some metals react with water to form metal hydroxide and hydrogen gas.2Na(sodium)+2H 2Some metals react with water to form metal hydroxide and hydrogen gas.2Na(sodium)+2H 2 Some metals react with water to form metal hydroxide and hydrogen gas.2Na(sodium)+2H 2 O⟶2NaOH+H2Some metals react with water to form metal hydroxide and hydrogen gas.2Na(sodium)+2H 2 O⟶2NaOH+H2 Some metals react with water to form metal hydroxide and hydrogen gas.2Na(sodium)+2H 2 O⟶2NaOH+H2 (hydrogen gas liberated)↑Some metals react with water to form metal hydroxide and hydrogen gas.2Na(sodium)+2H 2 O⟶2NaOH+H2 (hydrogen gas liberated)↑Less active metals react with boiling water. GENERALLY non-metals do not react with water.Water reacts with metals to form metal hydroxides and LIBERATE hydrogen gas.Water reacts with metals to form metal hydroxides and liberate hydrogen gas.2Na+2H 2Water reacts with metals to form metal hydroxides and liberate hydrogen gas.2Na+2H 2 Water reacts with metals to form metal hydroxides and liberate hydrogen gas.2Na+2H 2 O→2NaOH+H 2 Metals such as Mg, Al, Zn, Fe react with steam to form metal oxides and hydrogen.Metals such as Mg, Al, Zn, Fe react with steam to form metal oxides and hydrogen.Mg+H2Metals such as Mg, Al, Zn, Fe react with steam to form metal oxides and hydrogen.Mg+H2 Metals such as Mg, Al, Zn, Fe react with steam to form metal oxides and hydrogen.Mg+H2 O→MgO+H2 |
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| 45044. |
16. Explain , why calcium metal after reacting with water starts floating on its surface. Write the chemical equation for the reaction. |
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Answer» The reaction of calcium with water is less violent. So, the HEAT RELEASED is not sufficient for the hydrogen to catch fire. Calcium starts FLOATING because the bubbles of hydrogen gas which are formed during the reaction STICK to the surface of the metal and HENCE calcium floats on water. |
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| 45045. |
What is mass per cent of a solution? |
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Answer» ution the mass PER cent is described as the GRAMS of SOLUTE pergrams of solution MULTIPLIED by 100 get percentagehope it helps u....!! |
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| 45046. |
15. Name a metal which : I. Will react vigorously with cold water II. Will react with only hot water. III. Will only react with steam. IV. Will not react with water or even with steam. |
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| 45047. |
14. When metal X s treated with cold water , it gives a base Y with the molecular formula XOH. (Molecular mass =40) and liberates a gas Z which burns with a pop sound. Identify X,Y,Z. |
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Answer» The salt is NaOH and its molar mass can be calculated as FOLLOWS: Na(23)+O(16)+H(1)=23+16+1=40 It is clear that X is SODIUM, Y is sodium hydroxide and Z is hydrogen. The REACTION can be shown by following equation: 2Na+2H2O→2NaOH+H2+Heat Hydrogen is a highly inflammable gas and hence it easily CATCHES fire. |
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| 45048. |
What are chemical properties of metal oxides |
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Answer» hello friend!Explanation:Metal OXIDES are crystalline solids that contain a metal cation and an oxide anion. They typically react with WATER to FORM bases or with acids to form salts. MO + H2O → M(OH)2 (where M = group 2 metal) Thus, these compounds are often called basic oxides. |
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| 45049. |
find out the ratio of atoms by mass in which carbon dioxide Sulphur dioxide and Ammonia mass of an atom is 32 atom is 32 o atom is 12 n atom is 14 and h atom is 1 |
| Answer» ATOMS of the atoms is atoms of the atoms atoms of the atoms is atoms of the atoms | |
| 45050. |
Which is stronger oxidising agent: S₂O₈²⁻ or KMnO₄ ? and why : #NoSpamming |
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Answer» that In KMnO₄ the Mn charge = +7,On writing the reaction in acidic , neutral and basic medium.(i)So reaction occurs in acidic medium :-_______________________MnO₄⁻ + 8 H⁺ + 5 e⁻ ----→ Mn²⁺ + 4H₂O_______________________As you see here , Mn gives up 5 e⁻ . (Making this as a strong oxidizing AGENT)(ii) So reaction occurs in Neutral medium :-_____________________MnO₄⁻ + 4H⁺ + 3 e⁻ ------→ MnO₂ + 2H₂O_____________________As you can see here , In this neutral solution, it gives up 3 e⁻ in FORMATION of MnO₂ & also some OH ions.(ii) So reaction occurs in Basic medium :-_____________________MnO₄⁻ + e⁻ -----→ MnO₄²⁻_____________________As you can see here, it only gives up 1 e⁻ , So it makes it WEAKER oxidizing agent.Hence we can simply observe here :-MnO₄⁻ ion → Acidic solution > Neutral solution > Basic solution.Hence it is strong oxidising agent in acidic medium.Hope it Helps :-) |
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