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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. |
Please answer fast ................... it's important |
| Answer» OPTION 1) ........................ | |
| 2. |
H, C - CH, ~сн-14 Li-c, -СН3 9 |
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Answer» I am UNABLE to ATTEND the answer.i am unable to UNDERSTAND |
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| 3. |
1. A scale for measuring hydrogen ion concentration in a solution is called [ ] a) Pauling scale b) pH scale c) Mulliken scale d) All2. Identify the pH of a solution that turns blue litmus to red [ ]a) 8 b) 4 c) 9 d) 103. The strength of acid or base depends on the concentration of [ ]a) H3O+ b) OH–c) Both a and b d) None4. Which calcium compound does not increase the pH of acidic solids ? [ ]a) Calcium carbonate b) Calcium hydroxide c) Calcium oxide d) Calcium sulphate5. Who devised pH scale ? [ ]a) Sorensen b) Bohr c) Sommerfeld d) Arrhenius |
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Answer» 1.b.pH scale2.b.43.c. both a and b4.d.calcium sulphate5.a.SorensenExplanation:PLZ MARK me BRAINLIEST and FOLLOW me |
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| 4. |
Differentiate between ion and molecule |
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Answer» An ion is an atom or group of atoms which has a charge because it has different numbers of protons and ELECTRONS. A molecule is a group of atoms bound by covalent bonds and is ELECTRICALLY NEUTRAL. ... The basic difference is ions are charged SPECIES and molecules are OVERALL neutral. |
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| 5. |
Student Work Sheet-2 Convert the following temperatures to the Kelvin scale.(a) Room temperature(1) Freezing point temperature of ice(©) Boiling point temperature of water.Student Work Sheet-3Account for the following observations :(a) At the melting point temperature even though heatenergy is constantly supplied, temperature does notrise till the entire solid has changed to liquid state.() Water becomes cold if we add some ice cube to it. |
| Answer» FREEZING POINT of WATER- 273The BOILING water - 373Explanation: | |
| 6. |
Differentiate between complete and incomplete combustion . (At least two points of differences ) |
| Answer» E combustion OCCURS when there is enough oxygen to completely use up all the reactants. Incomplete combustion occurs when there is not enough oxygen resulting in the production of smoke, and less energy is produced when compared with complete combustion.THANKSHOPE IT IS USEFULPLEASE MARK ME BRAINLIEST!! | |
| 7. |
Write the formula of household bleach [ ]a) NaOH b) NaOCl c) Mg(OH)2d) NH3 |
| Answer» HOUSEHOLD BLEACH please MARK as BRAINLIEST.....and follow me... | |
| 8. |
Why solids and liquids can’t be compressed? |
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Answer» Because the particles can move, liquids don't have a definite shape, and they can FLOW. Because the particles are still packed CLOSE together, liquids can't easily be COMPRESSED and keep the same volume. |
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| 9. |
.all answer I wanthello guysright answer give |
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Answer» l + ACID = Metal salts + Hydrogen gas. Metal = Zn(zinc)OR. ZINC IS A REDUCANT METAL THAT DISPLACE HYDROGEN FROM AQUOS SOLUTION OF HCL. 3.HCL will be limiting reagents in the reaction, Zn will be EXCESS reagent. Amount of hydrogen produces will be = 0.26 MOLES, Hence HCL will be excess reagent... 3 . when ZINC metal react with hydrochloride acid it produces metal salt that in zinc CHLORIDE and hydrogen gas is liberated.. HOPE it helps you And hope it corrects. |
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| 10. |
What is the history of chemistry? |
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Answer» eighth century A.D., Jābir ibn Hayyān, a Muslim ASTRONOMER, philosopher and scientist, became one of the first to use scientific methods to study materials. Also known by his Latinized name, Geber, he is known as the "fatherof chemistry." He is thought to be the author of 22 scrolls describing methods of distillation, crystallization, sublimation and evaporation. He invented the alembic, a device used to distill and study ACIDS. He also developed an EARLY CHEMICAL CLASSIFICATION system using the properties of the materials he studied • |
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| 11. |
The physical state of a matter depends upon. a). temperature and pressure. b). pressure only. c) temperature only. d). nature of sustance. |
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| 12. |
Write the importance for the classification of element |
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Answer» because it would be EASIER to understand as compared to WITHOUT CLASSIFICATION of metal. which COMPLICATED to understand |
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| 13. |
Why fire is considered a matter?does it have mass and volume? |
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Answer» enough, the gases may BECOME ionized to PRODUCE a plasma . KIND of, but not really. Fire is the combination of heat and light being given off during a chemical REACTION of a material and heat. ... “fire has no volume THEREFORE no mass.THANK YOU HOPE IT IS USEFULPLEASE MARK ME BRAINLIEST |
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| 14. |
The IUPAC name of CH3CCl2CH3? |
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Answer» isopropylidene CHLORIDE or 2,2 dichloropropane |
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| 15. |
Pls answer fast... it's important..... |
| Answer» | |
| 16. |
Anybody is here from ICSE can use playing chemistry 1st chapter |
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Answer» okExplanation:i DONT UNDERSTAND you??any WAY i am CBSE |
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| 17. |
K2Cr207 + Нcl = Kcl + CrCl3 + H2O |
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Answer» K2Cr2O7 + 14 HCL = 2KCl +2CrCl + 7 H2OHope it will HELP you..... |
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| 18. |
Thomson model of atom is |
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Answer» The pulm pudding model is one of sevral HISTORICAL sentenfic models of the atoms .FIRST PROPOSED by J J Thomson on 1904. |
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| 19. |
Hen pH of rain water is less than 5.6, it is called [ ] a) Acid rain b) Basic rain c) Both a and b d) None |
| Answer» ACID RAIN (<7) | |
| 20. |
Examples that air is a matter |
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Answer» Considering the air-filled balloon, you KNOW you can SQUEEZE the balloon to change its shape.By this example u can PROVE that air is matter.Plz MARK as BRAINLIEST |
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| 21. |
Examples that air is a matter class 7 |
| Answer» HEY MATE!!❤Air is an example of the TYPE of matter known as gas. Other common forms of matter are solids and liquids. Gas is a form of matter that can CHANGE its SHAPE and volume. Considering the air-filled balloon, you know you can squeeze the balloon to change its shape.h☺pe it helps!!❤please mark me as the brainliest!!❤@brainly.in♡♡SRITI♡♡ | |
| 22. |
Why Cl is not there in option b ? |
| Answer» OPTION B ch2-ch-3 JR dhrubo Target release distribution PLAY today 8 | |
| 23. |
Why 3f is not exist in bengali |
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Answer» don't KNOW because I am not a Bengali EXPLANATION:U can ask to any Bengali FRIEND |
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| 24. |
Which of the following representation of I (Van’t Hoff factor) is not correct? |
| Answer» EXPLANATION: HOFF is not CORECT MATE | |
| 25. |
The number of isomers from the compound having molecular formula c2brclfl |
| Answer» SORRY for the INCONVENIENCE, I am a LITTLE BUSY now. | |
| 26. |
Pls help me out with this question.... it's important... |
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| 27. |
Which of the following pairs of elements would have a more negative electron gain enthalpy? O or S.Give reason to support your answer |
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| 28. |
I'm soooo confused on how to do this and it's now today!!! |
| Answer» YR it is DIFFICULT to doExplanation:PLZ MARK me as BRAINLIST ❤️✌️✌️ | |
| 29. |
Percentage composition of cuso4 |
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Answer» Percent COMPOSITION by elementElement : Symbol Mass : PercentCopper : Cu : 39.814% Oxygen : O : 40.097%SULFUR : S : 20.090%Explanation:please please please please please please please please please please please please please please please please please please please please please please please please please mark me as BRAINLIST. |
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| 30. |
Hi.. friendsplzzz answer question 3 a and b |
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Answer» (1) sodium chloride(2) downward displacement of air.I hope this will HELP youplease MARK BRAINLIST |
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| 31. |
List some natural fibres? if you answer i will rank you the brainliest |
| Answer» SILK ;juteExplanation:will be ANSWER | |
| 32. |
On a pH scale, pH of blood is 7.4. What is the nature of blood ? [ ] a) Neutral b) Highly alkaline c) Slightly alkaline d) Slightly acidic |
| Answer» SLIGHTLY ALKALINE (C) | |
| 33. |
Plzzz answer questions 2c) I n ii |
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Answer» I don't KNOW EXPLANATION:don't know |
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| 34. |
Which auqueous solutions have the highest boiling point? 1- 1.0 M Na2SO4 2- 3.0 M NH4NO3 |
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Answer» 1 - 1.0 M Na2SO4 or 1.0 M NaSt4Explanation:As we know greater the VALUE of van't HOFF factor higher will be the elevation in BOILING POINT and hence higher will be the boiling point of solution. Hence , 1.0 M Na2SO4 or 1.0 M NaSt4 has highest value of boiling point.PLEASE MARK AS BRAINLEST ANSWER !I HOPE IT HELPS YOU ! |
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| 35. |
What is ionisation? |
| Answer» IONIZATION energy is the energy needed to remove the FIRST electron from a neutral atom. You can KEEP on removing ELECTRONS until you run out of electrons. Each electron is harder to remove since you are getting a larger positive charge and the IONS are getting smaller since the greater positive charge causes compression of the orbitals. | |
| 36. |
Use gas ka naam Bataye Jiski aapurti aspataal Mein drav Roop Mein ki Jaati Hai |
| Answer» IO GAS ????????? | |
| 37. |
Pls answer my question... it's important.... |
| Answer» II)Non-metalExplanation:ACC. to the structure it has 4 e- in its outermost shellin 2ND period only carbon has 4e-And carbon is a non-metalHOPE IT HELPS!!!! | |
| 38. |
Low concentration of o2 in blood of people living at high altitude is due to |
| Answer» LOW pressure at HIGH altitude in results in LESS availability of O2 at high altitude so PERSON will have low concernration of O2 | |
| 39. |
Conc.hcl contains 38% hcl by mass and has density of 1.19 g/cm2 |
| Answer» | |
| 40. |
What is the purpose behind neutralising excess of HCl? |
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Answer» neutralisation is a CHEMICAL reaction in which an acid and a base react quantitatively with each other. In a reaction in water, neutralization results in there being no excess of HYDROGEN or hydroxide ions present in the solution. The PH of the neutralized solution DEPENDS on the acid strength of the reactants. |
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| 41. |
If an element X is present 70% by weight in its oxide X2O3, then atomic mass of element X is |
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Answer» ercentage of X in X2O3 = 70 %To Find:The ATOMIC MASS of element X.Calculation:- % of Oxygen = 100 - 70 = 30%- Let the mass of X₂O₃ be 'm'- Mass of oxygen in given X₂O₃ = 3 x 16 = 48 GRAMS⇒ 30% of m = 48⇒ 30 m/100 = 48⇒ m = 160 gram⇒ The molar mass of X₂O₃ is 160 grams.- Hence, the mass of 2 'X' atoms = 160 - 48 = 112- Atomic Mass of 'X' = 112/2 ⇒ Atomic Mass of 'X' = 56 gram- Thus, the Atomic mass of Element 'X' is 56 gram. |
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| 42. |
The electronic configuration of M3+ is [ Kr ] 4d10 . Its position in the periodic table is |
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Answer» 5th period GROUP number 13 EXPLANATION:M3+ is [Kr] 4d10 Therefore, M = [Kr] 4d10 5s2 5p1 Here the OUTERMOST electron enters into the N−shell i.e n=5 hence the it belongs to 5th period.The outermost electron enters into the P orbital hence it belongs to p block.For p-block elements no. of group = (12+no of electrons in p orbital) = 12+1 = 13 Hope it helps! Best wishes! |
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| 43. |
Please solve this as much fast as possible |
| Answer» HEYAAAA.....Here's your ANSWER1 -a2-b3-b4-c5-cmark me BRAINLIEST | |
| 44. |
For each reaction: complete the word equation, write the skeleton equation and the balanced equation. An acid with a base: Phosphoric Acid + Magnesium hydroxide → |
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Answer» tion:Guysif you are CONFUSED with that SEND me in the comment BOX l will give more questions regarding through it .so that you would have a better GRIP on it. |
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| 45. |
Photosynthesis in plants is Exothermic or endothermic in nature? |
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Answer» tion:Glucose (C6H12O6) is formed from carbon DIOXIDE and oxygen in the cells of green PLANTS in the PROCESS called photosynthesis. Photosynthesis is an endothermic reaction. ... Thus, green plants have the remarkable ability to TRAP the ENERGY of sunlight and use that energy to produce glucose from carbon dioxide and water. |
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| 46. |
Understanding Based Questions 1. Pressure and temperature determine the state's of substance. Justify.2. Solids are denser than liquids and gases. Explain. 3. Water as ice has cooling effect whereas steam causes severe burns. Specify. 4. Pressure cookers are used at higher altitude. 5. People perspire lot on hot humid day. Why? 6. Liquids show the phenomenon of diffusion to more extent than solids. 7. Carbon dioxide is a gas. Give reasons 8. Explain with examples the various factors on which rate of evaporation depend. 9. Tyndall effects are exhibited by both colloidal n Suspension solutions. Explain 10. How Plasma state is created in sun and stars. Activity Based QuestionWrite the activity to show following process: 1. The compressibility of solid, liquid and gas. 2. Rate of evaporation increases with increase in surface area. 3. Matter is particulate in nature. 4. Camphor sublimes on heating. 5. Rate of diffusion of liquid decrease with increase in surface area. Skill Based Questions1. Draw flow chart for interconversion of three states of matter. 2. Draw flow chart on True, Colloidal, and Suspension solution on the basis of Characteristics properties. Application Based Questions.1. Write the application of evaporation causes cooling in ur surroundings. 2. States the application of Plasma n B.C.Condensate in celestial bodies and daily life. 3. Explain the importance of particle motion in giving relief from air pollution hazard. Higher Order Based Questions.1. Water boils at 100C.Can we increase or decrease its boiling point. 2. Ice, Water, Steam are not different substance but different States. Which of them is regarded as fluid? 3. Sea water is homogenous as well as heterogeneous mixtures 4. Why Brownian movement can be observed in colloidal particles. 5. Ether and Acetone are stored in dark container n kept at cool place. |
| Answer» ANDING BASED QUESTION 1A solid can be converted into liquid and then to gas by decreasing the pressure and increasing the temperature. ... Every state of matter of any substance is stable at a corresponding pressure and temperature. Thus, temperature and pressure determines the state of a substance.2solids are generally DENSER than liquids because solids have particles closely packed and because of that they have more mass . in the case of liquid and gas they have a bit of freely moving particles.3When temperature is decreased to 0oC, water turns into ice. Whereas, when temperature is increased to 100oC, water is converted to steam. Water as steam has more latent heat than water in liquid and solid form. Hence, water as steam can cause severe burns while water as ice has a cooling effect.4At higher altitude atmospheric pressure is lower than near the sea. This causes the water to boil at a lower temperature (below 100), Due to this it takes longer time for food to be cooked. A pressure cooker prevents boiling of water at lower temperature and leads to quicker cooking of the food5It's excretion of fluid by the body that evaporates IMMEDIATELY and thereby serves as a MEANS to regulate body temperature. ... - On hot humid days, water is evaporated slowly, thus more of this sweat is retained. - Therefore, we perspire more during hot humid days6Because the molecules in liquids are packed distant from each molecule(there is gap between each molecule). Diffusion occurs more extently in liquids because diffusion depends on molecular space. But in solids molecules are tightly packed(there is a little internal space). So in solids diffusion occurs slowly.7Carbon Dioxide is gas because of the following reasons : The molecules present in the carbondioxide have more space between them. The carbon dioxide is not rigid. ... As a result , we can say that carbon dioxide is gas because it undergoes all the properties of a gas.8The rate of EVAPORATION depends on the liquid's exposed surface area (faster when increased), the humidity of surroundings (slower when increased), the presence of wind (faster when increased) and the temperature (faster when increased)9The dispersed particles of a colloid cannot be separated by filtration, but they scatter light, a phenomenon called the Tyndall effect ....Colloids.SolutionsColloidsSuspensionsDo not scatter lightScatter light (Tyndall effect)May either scatter light or be opaque10Stellar Winds and Coronal HeatingThe solar wind is a stream of charged particles—a plasma—that are ejected from the upper atmosphere of the sun and stars. It consists mostly of electrons and protons with energies of about 1 keV.hope it helps you please follow me mark me as brainlist please | |
| 47. |
Decompostion of vegetable matter is Exthermic or endothermic in nature? |
| Answer» TION:Decomposition of VEGETABLE MATTER is EXOTHERMIC reaction... | |
| 48. |
The skeleton and balanced equation for... An acid with a metal: Nitric Acid + Calcium → |
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Answer» hiiiii....Explanation:HNO₃Nitric acid/FormulaNitric acid is a very strong and corrosive mineral acid, also called aqua fortis or SPIRIT of NITER. FORMULA and structure: The chemical formula of nitric acid is HNO3. Its molecular formula is written as NHO3 and its molar mass is 63.01 g/mol.plz mark as BRAINLIST answer ❣️hope it will help you..❣️❣️ |
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| 49. |
We mix iron fillings with Sulphur and grind it,and we heat the mixture,a chemical change take place.Using the example explain the chemical change |
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Answer» It is a chemical CHANGE as heated iron fillings mixes with sulpur can not be again OBTAINED in the same form as they were before and a chemical change is a process in which NEW substances are formed thus by mixing these two solids and by grinding them we get a new MIXTURE thus this process is a chemical change because it is permanent in natureplease mark it as a brainliest answer and FOLLOW me |
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| 50. |
Which statement does not describe a property of a weak acid in solution? a. it forms a salt with sodium hydroxide b. it has a pH of between 8 and 9 c. it is only partly dissociated into ions d. it reacts with sodium carbonate to give off carbon dioxide |
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Answer» here's the ANSWERB is the correct option and answer....oh value of weak acid is between 3 to 6 but here the option is about. BASE ...so the option is B ..HOPE it HELPS you |
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