Saved Bookmarks
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. |
why group 18 elements are called noble gases? Name the noble gases? Give the two uses of noble gases. |
|
Answer» Answer: ஜ۩۞۩ஜ ӇЄƳƛ MƛƬЄ ஜ۩۞۩ஜ ★━━━━✧๑♡๑✧━━━━━★ Answer... the elements of group 18 are known as noble GASES because their valence SHELL orbitals are completely filled and therefore they REACT with only few elements under special conditions . Due to completely filled orbitals they are very less reactive as they do not NEED to gain or lose electrons. ★━━━━✧๑♡๑✧━━━━━★ нσρє нєℓρѕ !❤️❤️ |
|
| 2. |
What is oxygen............... |
|
Answer» Explanation: OXYGEN is the chemical element with the symbol O and atomic NUMBER 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other COMPOUNDS. Symbol: O Atomic mass: 15.999 u Atomic number: 8 Electron CONFIGURATION: [He] 2s²2p⁴ Electronegativity: 3.44 hope it helps you |
|
| 3. |
What happend to the lonisation when we move across the period and give reason for this? |
|
Answer» Answer: On the periodic table, first ionization energy generally increases as you move left to RIGHT across a period. This is DUE to increasing nuclear charge, which results in the outermost electron being more STRONGLY bound to the NUCLEUS. |
|
| 4. |
Explain all gas laws?? don't spam.... |
|
Answer» Answer: The Gas LAWS : pressure volume TEMPERATURE relationship.. BOYLE,'s law:The pressure_volume law charles' law:The Temperature_volume law. Gay-Lussac's law :The pressure Temperature law. The combined gas law. Explanation: Hope it helps you |
|
| 5. |
Which elements are needed to control the loop ? |
|
Answer» Answer: Hello user ! Your question: How to control a loop ? Answer : 1) There are two types of loop - EXIT controlled and entry controlled. 2) In a loop , you need initialization, condition and updation 3) The body of the program should be according to the syntax of the loop 4) In entry controlled loop , there are - for loop whose syntax is given below.. for (int variable; Condition; updation) { body of the loop i.ewhat do you need from the program } So , for this you MUST have appropriate condition and updation according to your REQUIREMENT . In this way , you can control a loop. Hope it helps ❤❤ |
|
| 6. |
Write the state of reactant and product if equation is h2+cl2=2hcl |
|
Answer» REACTANTS are HYDROGEN and chlorine that are on the LEFT side of the equation and products is it HCL which is on the right side |
|
| 7. |
What are metalloids? Give two example |
|
Answer» Answer: METALLOIDS look like metals but they are brittle like non metals. Metalloids are typically semiconductors which means that they both insulate and conduct electricity . ... Some IMPORTANT examples of metalloids are as follows : Boron(B), SILICON(SI) and Germanium(GE). |
|
| 8. |
what is Concept of PH (ph scale) ..... in equilibrium.... yar riya kal paper h help plz....... wrana fail.. google ka smaj hi nahi aata kya bk rha h....... ❤ |
|
Answer» Answer: if u want a very deep explaintion. go to you tube and search for akshay pandey. CHEMISTRY ur STD and ur board Explanation: our daily life SCALE measure in cm and ph scale measure the SUBSTANCE. ph scale tells about the substance properties which is ACIDIC or basic and neutral finished....... |
|
| 9. |
Write the reaction for bleaching action Cl2 |
| Answer» | |
| 10. |
Examples of exchange reaction d2o |
Answer» EXPLANATION:
|
|
| 11. |
Explain the kelbe's reactoin |
|
Answer» Answer: The Kolbe–Schmitt REACTION or Kolbe process (named after Hermann Kolbe and Rudolf Schmitt) is a carboxylation chemical reaction that PROCEEDS by heating sodium phenoxide (the sodium salt of phenol) with carbon DIOXIDE under pressure (100 atm, 125 °C), then treating the PRODUCT with SULFURIC acid. Explanation: 1 : the synthesis of a hydrocarbon (as ethane) by the electrolysis of a salt (as sodium acetate) 2 : the synthesis of salicylic acid by heating a mixture of sodium phenoxide and carbon dioxide under pressure at 180° to 200° C. |
|
| 12. |
elements of group 5 6 and 7 are less reactive as we go down in the group of the modern periodic table why |
| Answer» | |
| 14. |
2. Megha while playing with her doll fell down. She had a small cut on her knee and her doll's hand came off. Megha's mother fixed the doll and applied an antiseptic cream on Megha's wound. After few days the cut on Megha's knee healed and she was happy. Did Megha and her doll both undergo a physical change? and if explain |
|
Answer» yes Explanation: |
|
| 15. |
प्रश्न 1-संस्कृतभाषायां अनुवादं कुरुत-क) घोड़े दौड़ते हैं।ख) दो आदमी खाते हैं।ग) लड़कियां भाग रही है।प्रश्न 2 - अधोलिखितवाक्यान लूटलकारे परिवर्तयत-क) बाल हसति ।ख) सः चलति।ग) बालिका खेलन्ति ।प्रश्न 3 - निर्देशानुसार वचन परिवर्तयत-(क) बालका खेतन्ति । (दविवचने)(ख) बालिका, इसन्ति । (एकवचने)(ग) वानराः कूर्दन्ति । (एकवचने)प्रश्न 4 - अधोलिखितभकान संस्कृतभाषायां लिखत-12,13, 17,20प्रश्न 5-रेखांकितपदानि आभूत्य पस्न निर्माण(क) अश्वा खादन्ति। (ग) साहसति ।प्रश्न 6-'नर, शब्दस्य रूपाणि लिखत । |
|
Answer» but shssbeueududhdud |
|
| 16. |
What is law of mass action....... equilibrium constant.... ..... love u all answer plc.. ❤❤ |
|
Answer» hi।।।।।।।।।।।।।।।।।।।।।।। |
|
| 17. |
Short notes on factors affecting virbrational frequency |
|
Answer» Following are some IMPORTANT factors affecting the vibrational frequency of a BOND. Bond order AFFECTS the position of absorption bands. Higher the bond order LARGER is the band frequency. A C-C triple bond is stronger than a C=C bond, so a C-C triple bond has higher STRETCHING frequency than does a C=C bond. |
|
| 18. |
Calculate the oxidation of Cl in caocl2 |
|
Answer» Explanation: The MOLECULE CaOCl2 can be written as Ca(OCL)CL. It contains 2 Cl ATOMS of different oxidation state. The ion Cl- is in -1 oxidation state and OCl- ion is in +1 oxidation state. hope it's help you and Mark me as brainliest answer |
|
| 19. |
Class 10th all subjects syllabus 2020-21 |
|
Answer» okkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk |
|
| 20. |
Sodium was made in 1807, iron was made in 1200 BC. Why such a huge time difference? |
|
Answer» Answer: Sir Humphry Davy was ABLE to discover sodium (Na) in the LABORATORY. In 1807, he used electrolysis to remove this element from melted caustic soda. Electrolysis is a PROCESS that uses electric currents to create chemical changes. Another name for caustic soda is sodium hydroxide (NaOH). Although many people were using salt in the 1800s, it was difficult to extract sodium from it because this element is active and reacts easily with other elements. Davy found it was a metal. PURE sodium can go up in flames if it comes in contact with water, so he had to MAKE sure it was in a moisture-free environment. |
|
| 21. |
Percentage compositions of Ca3(PO4)2 |
|
Answer» Answer: Ca3(po4)2 Explanation: Molecular formula of CALCIUM phosphate is Ca3(PO4)2.
Percent of calcium = 310/120×100=38.71% Percent of phosphorus =310/62×100=20.0% Percent of OXYGEN = 310/128 ×100=41.21% Its MOLAR mass is 3(40)+2(31)+8(16)=310 g/mol... For 2 phosphate molecule=94.97×2=189.94g/mol Ca3(po4)2 = 189.94/310×100=61.24% the percentage composition of ca3(po4)2=61.24%
|
|
| 22. |
Calculate the number of moles for the following.1)64 g of oxygen atoms2)24.088 x 10^21 number oxygen atoms |
|
Answer» ibinsicbsoc SOCIAL U ???4?4?4?4?4?44??4?4!44??4?45?5!-!5:!4&!!4!5?66??44?4?6?5?4?4?5?5??4?5?6?5?5?55?566/7/7/7/7/5/4/3234?42??24?4353;5;5:3'*4|©π✓π{÷™×©√=`€®¥°{¢^^=$✓©©°•°¢✓|•✓•✓¢✓√™•√™π®•©√©÷©÷©{©÷®π√™✓•®``©€®®€®~®~®~®~®~®~®~™~~™™✓✓[©©π°°%%™%%%™%✓%[®™;!:: |
|
| 23. |
What is Combination reaction??take points |
|
Answer» Answer: A COMBINATION reaction is a reaction where two or more ELEMENTS or compounds COMBINE to FORM a SINGLE compound. |
|
| 24. |
Explain why HI is the strongest reducing agent |
|
Answer» Answer: HI is the strongest reducing agent. ... The HI has LOW thermal stability as COMPARED to HF, HCl, and HBR. HI can release H atoms easily as compared to HF, HCl, and HBr to reduce the other COMPOUND. |
|
| 25. |
Match:a).0.25 mole oxygen-i)6.022×10^ moleculeb).18g of water-ii)1.505×10^23 moleculec).46g of Na atom-iii)6.022×10^23 moleculed).1 mole C atom-iv)12.046×10^23 moluculeplease answer my questions correctly. |
|
Answer» husens 6 vvejerhkw vansh 7833629. &73!$+$( sujsejjwkg mdid63828 00⁰0000. edieubs |
|
| 26. |
Name this ionic compound Sn(NO3)2 |
|
Answer» Tin(II) Nitrate is the name of ionic COMPOUND Sn(NO3)2. HOPE IT WILL HELP YOU☜ |
|
| 27. |
Write short notes on shielding and dshielding of protons |
Answer» Answer: |
|
| 28. |
Observe the picture and answer the following questions:which colour is more soluble in solvent? name any two Industries where chromatography can be useful. Please don't give irrelevant answers or I will report all your answers |
|
Answer» In the PROCESS chromatography, we KNOW that:- The coloured component which is more soluble in solvent dissolves first, rises faster and produces a coloured spot on the paper at a higher position. Whereas the component which is less soluble produces a coloured spot on the paper at the lower position. In the above picture, we can see that the violet colour has produced the spot at the highest position. Thus, we can INFER that the violet colour is more soluble in the solvent. _______________________________ Two industries/areas where chromatography is used are :- • Diagnostic Lab : Here, chromatography is used to determine the amount of drug present in blood and separate it. • Forensic Science/Lab : It is also used in forensic labs to detect and identify the TRACE amounts of harmful substances [like poison] in contents of bladder or stomach. |
|
| 29. |
factors affecting equilibrium.... plz answer kal paper h kuch v nahi pda.... kya pta yehi question mat aaye ga ... plz answer plzz |
|
Answer» TEMPERATURE,PRESSURE and CONCENTRATION of the SYSTEM. |
|
| 30. |
The statements given below are incorrect .Write the correct statementa) Lead ions are discharged at anode during the electrolysis of fused lead bromide b) Acidic oxides dissolve in water to form alkalis.c) Alcohol is separated from a mixture of water and alcohol by the process of distillation |
|
Answer» Explanation: |
|
| 31. |
Significance of hunds rule |
|
Answer» Answer: Hund's Rule states that in a particular orbital, pairing of ELECTRONS do not take PLACE until it's singly occupied. It tells about STABILITY of an atom. also tells about maximum SPIN |
|
| 32. |
जो मीठे वचन बोले एक शब्द निकालिए |
|
Answer» जो मीठे वचन बोले उसे मृदु भाषी कहते हैं । |
|
| 34. |
Discuss isomerism in transitional metal complexes |
|
Answer» hi Explanation: the answer is in the ATTACHMENT |
|
| 35. |
2. एक p-ब्लॉक तत्व, आवर्त सारणी के 2 points2वें आवर्त व 14वें वर्ग में स्थित है। तत्वका परमाणु क्रमांक होगा-O406O 14O2 |
| Answer» | |
| 36. |
Statement given below is incorrect .Write the correct statementThe article to be electroplated, is always connected to anode of electrolytic cell |
|
Answer» Answer: The article is to be electroplated, is ALWAYS CONNECTED to anode of ELECTROLYTIC CELL. |
|
| 37. |
Calculate number of atoms in 270g of glucose980 9 of h2so4 |
|
Answer» Answer: Explanation: MOLARMASS of GLUCOSE 180g/MOL No.of mol = 270/180 = 27/18 = 1.5 Molarmass of H2SO4= 98g/mol |
|
| 38. |
What are the parts present in malphigi body and renal tuble |
Answer» guejdwbshdifvhhfhcdbsbwbwbsbxhxhxhxchchxhx |
|
| 39. |
The number of elements in the set S = {in + i–n : n ∈ z} is |
|
Answer» Answer: |
|
| 40. |
the integral heat of solution of anhydrous cuso4 is - 15.9 K cal and that of cuso4.5h2o is 2.8 K cal what is the heat of hydration of cuso4 |
| Answer» | |
| 41. |
EXPLAIN THIS QUESTION AND ANSWER.An element X(atomic number 17) reacts with an element Y (atomic number 20)to form a divalent halide. (a)where in the periodic table are elements X and Y placed? (b) Classify X and Y as metal,non metal or metalloid. (c) What will be the nature of oxide of element Y? Identify the nature of bonding in the compound formed. (d) Draw the electron dot structure of the divalent halide. |
|
Answer» Answer: a. BECOUSE no value b. matro and NON metal c. non metal |
|
| 42. |
Find its IUPACname ? |
|
Answer» Answer: I hope it helps you please mark at brainlist answer me Explanation: Give the IUPAC name for the following COMPOUND: Identify the functional group. ... Find the longest carbon CHAIN. ... Number the carbons in the carbon chain. ... LOOK for any branched groups, name them and give their POSITION on the carbon chain. |
|
| 43. |
43. The difference in delta H and delta E for thecombustion of methane at 27°C would be1)-1800 Cal2) -162 Cal3) -1200 Cal4) 0please answer me only dont ask thanks, follow , |
| Answer» | |
| 44. |
1. Starting from suitable Grignard's reagent, how would youprepare the following alcohols?a. Propan-1-olb. Butan-1-olc. Butan-2-old. 2-Methylbutan-2-ole. Pentan-2-olf. Tert-butylalcohol |
|
Answer» A |
|
| 45. |
What is molecular mass of H PO,. Determine its equivalent mass of H PO, in followingreaction-i) H.PO, + NaOH → NaH PO, + H2O ii) HPO, + 2NaOH →Na HPO, + 2H,0 |
|
Answer» the BRANCH of science concerned with the substances of which matter is COMPOSED, the investigation of their properties and reactions, and the USE of such reactions to form NEW substances. |
|
| 46. |
Write the symbol, atomic number and atomic mass of the following elements.Magnesium, Zinc, Sodium, Nitrogen, Calcium, Iodine |
|
Answer» The Elements, sorted by Atomic Mass Atomic Number SYMBOL Atomic Weight (AMU, g/mol) 12 Mg 24.305 13 Al 26.98154 14 Si 28.0855 |
|
| 47. |
(c) paper(d) cloth7. The process by which a solid changes into aliquid is called(a) freezing(b) melting(c) condensation (d) evaporation |
|
Answer» MELTING is the CORRECT answer....
|
|
| 48. |
The density of 1.85 mass per cent calcium hydroxide solution is 1.025 g cm. The volume of 0.1 M HCl solutionswould be required to neutralise 25 mL of this solution is? (Answer is 127.5 ml need explanation) |
Answer» GIVEN:-Molarity of HCl SOLUTION = 1M Volume of the solution = 360mL To Find : Mass of calcium hydroxide required to completely NEUTRALIZE this HCl solution. Solution : ■ First of all let's WRITE chemical reaction :- 2HCl+CA(OH)_2 CaCl_2+2H_2O As per chemical reaction, One mole of calcium hydroxide reacts with two moles of hydrochloric ACID solution. • Mass of 1 mole of Ca(OH)₂ : 74g Mass of 2 moles of HCl : 73g ■ Let's find mass of HCl present in the solution. We know that /volume mole molarity = • 1 = mole/0.36 (L) |
|
| 49. |
Calculate the number of water molecule present in one drop of water which weights 0.18 g inplease answer me...then i will follow you. |
|
Answer» Answer: M of H2O= 18 g (mass) ∴n = 0.18/18 = 0.01 (MOLES) 1 mole contains 6.023×10²³ molecules ∴0.01 mole contains (6.023×10²³)×0.01 = <U>6.023×10^21 molecules Hope this helps u..... |
|