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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. |
Physical and chemical change have both reversibal and irreversible process ?! |
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Answer» Physical CHANGE is REVERSIBLE but CHEMICAL CHANGES are always irreversible. |
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| 3. |
5. What do the following symbols stand for?(a) H (b) H (c) 2H (d) 2H,5. What is meant by atomicity ? Name a diatomic element.(a) Explain the terms 'valency' and 'variable valency'.(b) How are the elements with variable valency named ?Explain with an example.3. Give the formula and valency of :(a) aluminate(b) chromate |
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Answer» Answer: |
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| 4. |
28. The circumference of second orbit of H-atomwavelength of electron is 5 x 10-9m |
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Answer» CIRCUMFERENCE =2 pi R......(1) r=2×2(0.529)×10^-10 m r=2.116×10^-10 Put in eq 1 and you will get the answer |
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| 5. |
Which is largest in size O2- or N3- and why |
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Answer» N³ is larger than O² because the ATOMIC size of N³ is larger than O² IF THIS ANSWER IS RIGHT MARK ME AS A BRAINLIEST |
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| 6. |
Explain oxidation and reduction are opposite to each other |
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Answer» Yes. Because oxidation is ADDITION of OXYGEN,removal of HYDROGEN and LOOSING of electrons. Reduction is addition of hydrogen,removal of oxygen and GAINING of electrons. Hope it will help you!!!!! |
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| 7. |
Which of the following electron transition in hydrogen atom will require the energy equivalent toionization energy?from n =1 to n = 2(B) from n =2 to n = 3(c) n = I to n=3 (d) n=1 to n = infinity |
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| 8. |
Explain me the chapter language of chemistry |
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Answer» AChemical symbol represent a SPECIFIC element or an atom of an element. A CHEMICAL symbol makes it easier to WRITE a chemical reaction. ... A Valency describes how easily an atom or radical can combine with other chemicalspecies |
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| 9. |
What would happen to iron railing on the roadside if they are not painted why does this happen |
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Answer» Answer: It happens because the iron railing COMES in contact with the components of air such as oxygen and moisture which are the main REASON for rusting.If we paint it we can PREVENT the oxygen and moisture to come in contact with.Thus we can prevent the iron railings from GETTING rusted.So the iron railings on the road side . |
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| 10. |
What are the three estate of matter can they be converted from one state to another? |
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Answer» Answer: Solid liquid and gas are the THREE states of matter.They can be converted from one state to another by the help of TEMPERATURE and PRESSURE. |
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| 11. |
Not able to do calculations in chemiatry numericals please give me some tips what to do after putting values chapter 2 structure of atom |
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Answer» Answer: just take approx of values like planks constant =6.626X10^-34 take this as 6.6X10^-34 and same THING apply for rest of values this MAKES calculations EASIER then before |
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| 12. |
Find the molecular weight of Co2 (C=12)(O=16) step by step explanation |
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Answer» 12+ 16×2 = 12+ 32 .................. |
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| 13. |
hydrogen peroxidefuel it oxidisesthe ferrous ion to ferricthe ion and reduced itselfthe to water .what is thethe balanced equation |
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Answer» <STRONG>Answer: Explanation: Hydrogen Peroxide is the Strong Oxidizing agent and commonly pale BLUE in colors. As per as the Question, I need to PROVIDE the balancing equations for the given question. Therefore, Conversions of the Ferrous Ions to the Ferric Ions by the Oxidizing property of the Hydrogen Peroxide is given below ⇒ Fe²⁺ + [O] -----------→ Fe³⁺[O] is the Oxidizing agent, Hydrogen Peroxide. Conversion of the Hydrogen Peroxide into the Water is given below, 2H₂O₂ ---------→ 2H₂O + O₂This reaction can be only POSSIBLE under certain CONDITIONS.
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| 14. |
List mineral acids organic acid and bases |
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Answer» MINERAL acid Explanation: sulphuric acid nitric acid hydrochloric acid carbonic acid phosphoric acid organic acids lactic acid tartaric acid oxalic acid amino acid maleic acid bases sodium hydroxide potassium hydroxide ammonium hydroxide calcium hydroxide magnisium hydroxide I hope this will HELP u❤️❤️ |
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| 15. |
What is the equation for digestion of food? |
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Answer» Answer: |
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| 16. |
Explain why most of the metal artical become dull when exposed to air |
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Answer» most of metal BECOME dull when exposed to air because their colour FADE away. |
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| 17. |
Exvitayion potential of hydrogen aton is v what is its ionization potential |
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Answer» Explanation: The potential difference through which the extra ELECTRON is to be in acceleration in order for it to cause the IONIZATION of an atom is called the ionization potential of the atom. For example, for the hydrogen atom, the ionization ENERGY is 13.6 EV. |
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| 18. |
Explain the action of dilute hydrochloric acid on magnesium ribbon |
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Answer» Explanation: MAGNESIUM + HYDROCHLORIC ➡ Magnesium chloride Mg+HCl ➡ MgCl |
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| 19. |
What are the following reaction |
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Answer» 2) DISPLACEMENT reaction |
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| 20. |
what do you mean by respiratory system?write three pathway I need the answer in urgent please help me fast friends |
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Answer» Explanation: It consists of he upper AIRWAY, which is the nose, mouth, throat, and TRACHEA (windpipe), and the lower airway. The lower airway begins in the chest, where the trachea splits into two tubes, CALLED the mainstem bronchi, which each go to one of the lungs. The bronchi continue to split into smaller and smaller airways, and eventually split into even smaller airways called bronchioles, which split even further, until they become tiny airways called terminal bronchioles. The terminal bronchioles have microscopic air sacs called alveoli. There are millions and millions of alveoli. The walls of the alveoli are incredibly THIN, and they are surrounded by tiny capillaries. Oxygen passes from the alveoli into the capillaries , and is exchanged with carbon dioxide from the blood. The carbon dioxide is exhaled from the lungs, and oxygen is inhaled, and delivered to the cells. |
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| 21. |
What is 55 degree C in Fahrenheit |
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Answer» Explanation: 131°C by formula F=(C×9/5)+32 |
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| 22. |
Complete and BalanceNa + H20N2 + H2Co2 + H20KCIO3SO2+O2 |
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Answer» Answer: 2Na + 2H20---- 2NAOH +H2 N2 + 3H2----- 2NH3 CO2 + H2O----H2CO3 |
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| 23. |
My height difference is a physical change (or) chemical change? definition? |
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Answer» Answer: increasing Height is CHEMICAL CHANGE because it can't be reversed. |
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| 24. |
Setting of Plaster of Paris takes place due to(a) Oxidation(b) Reduction(c) Dehydration(d) Hydration |
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Answer» Answer: |
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| 25. |
Hey!.... need quick help! |
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Answer» HEY ❤ Answer in the ATTACHMENT ✌❤ |
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| 26. |
Name the salt used fertilizer in sugar beet |
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Answer» Explanation: A sugar beet is a plant whose root contains a high concentration of sucrose and which is GROWN COMMERCIALLY for sugar production. In plant breeding it is known as the Altissima cultivar group of the common beet (Beta vulgaris). Together with other beet CULTIVARS, such as beetroot and chard, it BELONGS to the subspecies Beta vulgaris subsp. vulgaris. Its closest wild relative is the sea beet (Beta vulgaris subsp. maritima). Hope it WORKS... FOLLOW ME...
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| 27. |
Name three compunds that sublime on heating |
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Answer» Answer: |
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| 28. |
2-ethyl phenols is stronger acid than 3-chloro phenol why? |
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| 29. |
Write two characters of base |
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Answer» Answer: Explanation: Bases taste BITTER, feel slippery, and conduct electricity when DISSOLVED in water. Indicator compounds such as LITMUS can be used to detect bases. Bases turn red litmus paper blue. The STRENGTH of bases is measured on the pH scale. plzz mark me brainliest :) i dont even hav one T_T. |
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| 30. |
15 examples of reversible changes |
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Answer» hhi FRND melting of ice melting of wax cutting of trees boiling ( LIQUID) melting dissolution of SUGAR and water evaporation condensation....... |
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| 33. |
What are the results drawn from cathode discharge tube |
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Answer» SUMMARY. J.J. Thomson's experimentswith cathode ray tubes SHOWED that all atoms contain TINY negatively charged subatomic particles or electrons. ... Rutherford's gold foil experiment showed that the atom is mostly EMPTY space with a tiny, DENSE, positively-charged nucleus |
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| 34. |
(A) Write the IUPAC name of the following |
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Answer» Answer: SORRY I can't answer it right now but I'll surely answer it HURRY |
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| 35. |
2naoh + h2so4 = na2so4 + 2h2o is precipitation reaction |
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Answer» Answer: Yes , it is the precipitation reaction because there are exchange of IONS between Naoh and H2So4. Explanation: Precipitation reaction is also known as Double Displacement Reaction . AND The reaction in which two COMPOUNDS react by exchange of ions to FORM two NEW compounds are called Double Displacement Reaction. HOPE THIS WILL HELP YOU PLEASE MARK IT AS BRAINLIEST ANSWER. |
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| 36. |
Explain Distillation |
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Answer» ❖ Distillation : ❱ Two MISCIBLE LIQUIDS with difference in boiling points are boiled WITHOUT DECOMPOSITION. ❱ E. g., acetone and water |
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| 38. |
Give reason -1)bronze statues turn greenish when kept in open for a few days. |
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Answer» Answer: Bronze TURN GREEN because of chemical reactions between these alloys in atmosphere . Green LAYER is MOSTLY of copper carbonate |
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| 39. |
The most extensive, commercially useful source of thorium as monazite sand occurs in India at |
Answer» Heya MATES !!!!ANSWER :-The most extensive, COMMERCIALLY useful source of thorium as monazite sand occurs in India at Travancore Coast. Hope it HELPS !!!! |
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| 40. |
Bascicity of toludine |
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Answer» HEY mate here is your answer☺ As expected from Inductive(/hypercojugative) as well as ortho effect the basicity order should be: ortho-toluidine>para-toluidine>meta-toluidine. But,experimental order is: para-toluidine(Pka=5.12)>meta-toluidine(Pka=4.69)>ortho-toluidine(Pka=4.39). The order of basicity is explained by TWO opposing effects :i) inductive effect ii) Stability of the conjugate base. Here 2nd factor is more SIGNIFICANT for ortho-toluidine & 1st factor is important for para-toluidine. For ortho-toluidine the conjugate base [o-MeC6H4NH3+] is destabilized by steric interactionbetween -NH3+ & -Me(at ortho). This desatabilization is absent with para-toluidine & meta-toluidine.Tha's why basicity of:ortho-toluidine(Pka=4.39)< para & meta isomer.On the other hand,in meta toluidine only +I of Me is operative whereas in para-toludine both hypercojugative & +I of Me is operative, that's why basicity of:para-toluidine(Pka=5.12)>meta-toluidine(Pka=4.69). |
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| 41. |
.....give answer me..... |
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Answer» ANSWER:Hno3 Explanation: |
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| 42. |
List for observation that help us to determine whether in chemical reaction has take place |
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Answer» There will be CHANGE in state colour shape SIZE |
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| 43. |
Write an activity to show the decomposition of NaCI (I) as an example of decomposition reaction |
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Answer» 2NaCl(molten)― 2NA + Cl2 |
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| 44. |
What is the effect of temperature and density of a liquid on the rate of difussion? |
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Answer» Answer: Diffusion is directly PROPORTIONAL to temperature as it INCREASES the kinetic ENERGY of the MOLECULES and inversely proportional to density of the substance. On increasing the temperature, the diffusion increases and on increasing the density of substance, the diffusion decreases and vice versa. Explanation: |
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| 46. |
How many types ofmolecules structure of material? |
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Answer» Answer: chemical reaction and MOLECULES molecules are songs in which the ELEMENT are in definite fixed RATIOS scene in figure 12those ACTORS are held together usually by one of the three TYPE of chemical bonds initiative about |
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| 47. |
The number of g-molecule of oxygen in 6.02 x 1024CO molecules is |
Answer» HEYA Mates !!!!Answer :-The number of g-molecule of OXYGEN in 6.02 x 1024CO Molecules is 5 gram of Molecule. Hope it HELPS !!!! |
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| 48. |
Answer these questionsI will mark brainliest 1) Name matter classification in terms of composition. 2) Why do gases diffuse rapidly? |
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Answer» Answer: 1.element ,compound and mixture 2.gases DIFFUSE rapidly as they have INTERMOLECULAR SPACES between them so they diffuse rapidly Hope it will help you DEAR |
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| 49. |
What is the colour of ferrous sulphate crystals |
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