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. |
2.6. When you mix solutions of lead (II) nitrate and potassium iodide, (1) What is the colour of the precipitate formed ? Name the compound involved(ii) Write a balanced chemical equation for the reaction(iii) Is this a double displacement reaction ?rate is yellow in colour. The compound is lead (II) iodide with che |
|
Answer» ong>Explanation: Ans. The wind symbolises the uncontrollable and raw power of NATURE. The wind god symbolises STRENGTH and steadfastness. Weaklings who are weak in the mind and body are swept away by the mighty power of the wind. Only those who are BLESSED with steadfast minds and hearts survive in the bitter struggle of life. The poet gives a broader MESSAGE. Whatever we do or think must stand on the foundations of strength and power. Only strong minds and bodies can face the anger of the wind and challenges of life. We can befriend the god of wind by building strong homes and doors. We can also WIN his favour by firming the body and making the heart steadfast. |
|
| 3. |
Ques3. Answer the following question: Q1-Give any two examples of chemical change.Q2-What do you mean by reversible changes?Q3-Define sublimation with an example.Q4-Differentiate between the periodic and non- periodic changes.Q5-Differentiate between the desirable and undesirable changes |
|
Answer» ONG>Answer: 1st one.iron turns to rust and BURNING of paper |
|
| 4. |
What is the definition of QUANTUM THEORY ?? |
|
Answer» ong>Answer: A theory of matter and ENERGY based on the concept of quanta, ESPECIALLY QUANTUM mechanics. Please mark me the BRAINLIEST and Rate me and give me thanks. |
|
| 5. |
Name the isotopes of hydrogen |
|
Answer» ONG>Answer: There are three isotopes of the ELEMENT hydrogen: hydrogen, deuterium, and tritium. How do we distinguish between them? They each have one SINGLE proton (Z = 1), but differ in the number of their neutrons. Hydrogen has no neutron, deuterium has one, andtritium has two neutrons. Explanation: please mark as brainlist |
|
| 6. |
1.2. Match the following bases with suitable phrases: 1. Slaked lime e)(a) antacid2. Magnesia a)(b) manufacture of soap3. Sodium hydroxide b)(c) used to remove grease stains4. Ammonium hydroxide )(d) amphoteric oxide5. Zinc oxide d)(e) softening of hard water |
| Answer» ONG>ANSWER: | |
| 7. |
Atomic mass of some elements are given [Mg=240=16] a) how many atoms are these in 120g Mg?b) find the mass of A×6.022×10²³ oxygen atoms |
|
Answer» F MOLES=120/24=5 No:of atoms=5*6.022*10^23 b) no: of moles = (A*6.022*10^23)/(6.022*10^23)=A Mass = A*16 |
|
| 8. |
Which one is positive oxjdation state NH2OH NH3 Oxygen Vanadium |
|
Answer» ong>Answer: //please .. MARK .. as .... brainlist../// Explanation: The sum of the oxidation states of all the atoms in an ion is EQUAL to the charge on the ion. The more electronegative ELEMENT in a SUBSTANCE is given a negative oxidation state. The less electronegative one is given a positive oxidation state. |
|
| 9. |
4.What is an atom? How big atoms are? |
|
Answer» ong>Answer: An ATOM is the smallest unit of ordinary matter that FORMS a chemical element. ... EVERY solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across pls follow me I will follow you back you one click can make me happy pls mark me brainlist |
|
| 10. |
NaOH + C17H35COOH =?? |
|
Answer» a mate! here is ur ANS.... >>NAOH + C17H35COOH → C17H35COONa + H2O it means.... >>SODIUM Hydroxide + STEARIC Acid = Sodium Stearate + Water hope it helps❤❤ |
|
| 11. |
The molarity of orthophosphoric acid having purity of 70% by weight and specific gravity 1.54 would be |
|
Answer» ong>Answer: 11M Explanation: The molarity of orthophosphoric ACID having purity of 70% by WEIGHT and SPECIFIC GRAVITY 1.54 would be. 11M. pls mark me as brainliest |
|
| 12. |
2. Mahmud of Ghazni attacked India mainly- (a) to establish his empire in India.(b) to spread Islam in India.(c) to take away the famous artisans from India.(d) to plunder the wealth of India. |
|
Answer» ONG>ANSWER: C) ................. .......... . ....... |
|
| 13. |
Atomic mass of some elements are given(Mg=24,O=16) a. how many atoms are there in 120g Mg b. Find the mass of 4×6.022×10^23 oxygen atoms |
|
Answer» ong>ANSWER: a. no. of ATOMS = 30.1×10^23 b. 6.402×10^47 Explanation: MARK ME AS BRAINLIEST |
|
| 14. |
How many gram of NaCl required to complete 2% NaCl solution with 400 ml |
|
Answer» ong>Explanation: The problem provides you with the MOLARITY and volume of the target solution, so your first step here will be to use this INFORMATION to figure out how many moles of sodium CHLORIDE, NaCl , it must CONTAIN. Once you know that, use the compound's molar mass to convert the number of moles to grams. So, molarity is defined as the number of moles of SOLUTE per liter of solution. In your case, a 0.77 M solution will contain 0.77 moles of sodium chloride, your solute, in 1.0 L of solution. Your target solution has a volume of 985 mL ⋅ 1 L 10 3 mL = 0.985 L
which means that it will contain 0.985 L solution ⋅ = 0.77 M 0.77 moles NaCl 1 L solution = 0.75845 moles NaCl Sodium chloride has a molar mass of 58.44 g mol − 1 , which basically means that one mole of sodium chloride has a mass of 58.44 g . In your case, 0.75845 moles of sodium chloride will have a mass of 0.75845 moles NaCl ⋅ 58.44 g 1 mole NaCl = ∣ ∣ ∣ ∣ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ a a 44 g a a ∣ ∣ −−−−−−−− |
|
| 15. |
Calculate the mass of Sodium acetate required to make 500 ml of 0.375 molar aqueous solution. Molar mass of CH2COONa is 82.0245g |
|
Answer» ONG>ANSWER: I THINK the answer 8.658 |
|
| 16. |
In Nacl molecule which atom accept electron |
|
Answer» ong>Answer: |
|
| 17. |
Analyse the statement and given below and correct the wrong statement a)as distance from nucleus increases , energy of shells decreaseb) electron filling in shell occurs in the increasing order of energyc) as distance increases, attraction between nucleus and electron decreasesd) s and p subshells are common in all shells |
|
Answer» ONG>Answer: d s subshell is common to all the shells but not p sub shell as alkali METALS and alkali earth metal last ELECTRON entre to s subshell so it is not possible for them to enter in p sub shell as already there last electron had ENTERED to s sub shell yes expect s block element in p block and d block and f block p sub shell is common but not in s block as shell starts from s,p,d,f so statement d is wrong among other options i.e your answer is ( D) hope it was helpful !! |
|
| 18. |
(b) Mendeleev's contributions to the concept of periodic table laid the foundation for the Modern Periodic Table. Give reasons. |
|
Answer» ong>Answer: Mendeleev laid the foundation for the modern periodic table by showing periodicity of the properties of the elements by ARRANGING the elements (63) then known into 8 groups, by LEAVING gaps for undiscovered elements and predicting their properties. He made SEPARATE groups for metals and non-metals. Explanation: Mark me as BRAINLLEST. |
|
| 19. |
Harshan has set up the following activity shown in the picture in the chemistry laboratory. Three test tubes A, B and C are taken and an iron nail is placed in each of the test tube. Test tube A has iron nail half immersed in normal water, Test tube B has iron nail dipped in boiled water and Test tube C has iron nail with a white coloured chemical substance. Answer the following questions in context to the above activity: (a) What is Harshan trying to conclude from the above activity? (b) The white substance kept in test tube C, is a good absorbent of water. Name the chemical substance. (c) The iron nail present in which of the above test tubes will get rusted, if it is left for few days and why? (d) State why is boiling water taken in test tube B? |
|
Answer» ong>Answer: |
|
| 20. |
Mcq. A liquid oxidising agent (a) HCl (b) HBr (c) Br2 |
|
Answer» ong>Answer: OPTION number C is your answer PLEASE mark me brainliest because I ANSWERED first |
|
| 21. |
atomic mass of some elements are given [mg=24,0=16. a) how many atoms are there into mg? b) find the mass of 4×6.022×10²³oxygen atoms. |
|
Answer» ong>Answer: The Mole As we have observed, ATOMS are very small--too small to be weighed or counted individually. NEVERTHELESS, we often need to know how many atoms (or molecules, or electrons, and so on) a sample CONTAINS. To solve this dilemma, we use a counting UNIT called Avogadro's number, named after the ITALIAN scientist Amedeo Avogadro (1776-1856): |
|
| 22. |
177.plsz answer it....... |
|
Answer» ONG>Answer: I THINK ( B ) is the correct answer. TELL me your PHONE number i want to do sex with you |
|
| 23. |
Ionisation energy order of Li,Be,B |
Answer» SEE my MEMO ATTACHMENT |
|
| 24. |
Why does Solid have the highest density? Why do Gases exhibit the most random motion among the three state of matter |
Answer» OLID are RIGID so they have high DENSITY to maintain their shape//gas exhibit the most random motion because the the attraction between particles is the really LOW |
|
| 25. |
Please give answer |
|
Answer» trilling (2)purlling (3) purlling (4) purlling (5) strilling (6) strilling (7) purlling (8) strilling (9) purlling l(10) purlling |
|
| 26. |
I shell, how many elements arethere is second beroid? |
|
Answer» ONG>Answer: 118 Explanation: i HOPE it help you make me BRAINLIEST |
|
| 27. |
पार्ट्स पर मिलियन में सांद्रता का अर्थ स्पष्ट करो |
Answer» ONG>Answer:PLEASE explain your problem or question in ENGLISH. |
|
| 29. |
2.If magnesium reacts with hydrochloric acid, what gas is produced? A) HydrogenB) carbon dioxideC) oxygenD) chlorine |
|
Answer» agnesium REACTS with hydrochloric acid HYDROGEN GAS is PRODUCED |
|
| 30. |
HCl anu ki bandhan lambi jadtv agudn2×10-40. Samnit d 1.0g |
|
Answer» vhhgfrggfdfhfdzz |
|
| 31. |
Angular momentum of the electron in the 4th energy shell in the hydrogen atom is |
|
Answer» ONG>Answer: The angular MOMENTUM of an electron in hydrogen ATOM is 2π4h. Explanation: hope it helps you, mark as the brainliest and FOLLOW me |
|
| 32. |
State the uses of 1) sodium hydroxide,2) chlorine,3) hydrogen |
|
Answer» there! (a) SODIUM hydroxide: (i) It is used for making soaps and detergents. (ii) It is used in the MANUFACTURE of paper. (b) CHLORINE: (i) It is used in the production of bleaching POWDER. (ii) It is used in WATER treatment, (11)PVC and CFC's (c) Hydrogen: Used in fuels ,margarine,ammonia for fertilisers. Hope it helps! |
|
| 33. |
Certain amount of solution is present in 5 grams of the solution and smart biomass percentage is 10% how much salute was the world in the given solution |
|
Answer» ong>ANSWER: Weight of solute+ weight of solvent Weight of solute
]×100 Let the weight of the solute be 'x'. 2.38= x+500 x×100
⟹2.38x+1190=100x ⟹1190=97.62x ⟹x= 97.62 1190
=12.190g ∴ Mass of solute =12.19 grams Explanation: mark it as BRILLIANT |
|
| 34. |
A. Out of zinc, iron and copper, which metal.can displace the other two metals from their saltsolutions? Justify your response. |
|
Answer» ONG>Answer: Zinc Explanation: Zinc because It COMES above from iron and COPPER in the reactivity series |
|
| 35. |
एक पदार्थ की मात्रा प्रथम कोटि की अभिक्रिया द्वारा डेढ़ सौ सेकेण्ड में आधी हो जाती है कितने समय में पदार्थ का चौथाई भाग शेष हो जाएगा |
|
Answer» ong>ANSWER: PLEASE ask me QUESTIONS in ENGLISH Explanation: mark me as brainliest ANSWERS please please |
|
| 36. |
Explain difference between metallic and electrolytic conduction. |
|
Answer» ong>Answer: |
|
| 37. |
What is the volume occupied by 1.5mole of nh3 at ntp |
|
Answer» ong>Explanation: At STP, 1 MOLE of oxygen occupies 22.4litres. ∴ 0.1 mole of oxygen will occupy = 0.1 × 22.4 = 2.24 litres. Thus, the volume OCCUPIED by 0.1 moles of CO 2
at STP is 2.24 L How satisfied are you with the answer? This will HELP us to improve better |
|
| 38. |
The subshell electronic configuration of an element is given in two way 1) 1s² 2s² 2p6 3s² 3p6 3s² 4s²2) 1s² 2s² 2p6 3s² 3p6 3d5 4s¹which among these is the correct electronic configuration ? give reason. |
|
Answer» ong>Answer: 2 is correct option |
|
| 39. |
What are sex hormones |
|
Answer» ong>Answer: a hormone, such as oestrogen or TESTOSTERONE, AFFECTING SEXUAL DEVELOPMENT or reproduction |
|
| 40. |
Plzz answer my question urgently tomorrow is my exam |
|
Answer» ong>Answer: 1. Who 2. Which 3. On which 4. Whose 5. Which 6. Whose 7. In which 8. That 9. Who 10. On which I HOPE U ARE SATISFIED WITH MY ANSWER.PLZZ MARK ME AS BRAINLIEST. |
|
| 41. |
Which of the following is the shape of PCl5 molecule a.trigonal pyramidal b.trigonal bipyramidal c.octahydral d.trigonal planar |
|
Answer» ong>Answer: Complete answer: -Now, it has a TOTAL of FIVE unpaired electrons. -So, the hybridisation of PHOSPHORUS is sp3d and the geometry will be trigonal bipyramidal. -Because it has 5 BOND pairs and 0 lone pairs. |
|
| 42. |
The subshell electronic configuration of an element is given in two way 1) 1s² 2s² 2p6 3s² 3p6 3s² 4s²2) 1s² 2s² 2p6 3s² 3p6 3d5 4s¹ |
|
Answer» ong>Answer: 2 is correct Explanation: |
|
| 43. |
Give answer |
Answer» MASTE YOUR ANSWER:-घोड़ा = घोड़ीबेटा = बेटीलड़का = लड़कीपुरुष = स्त्रीराजा = रानीदादा = दादीशेर = शेरनीबूढ़ा = बुढ़ियागायक = गायिकानाना = नानीभाई = बहनचाचा = चाचीTHANKS ツ ◆━━━━◆❃◆━━━━◆ |
|
| 44. |
Explain how groundwater is recharged. 3line m likna hai |
|
Answer» ong>Answer: Groundwater is recharged naturally by rain and snow melt and to a smaller extent by SURFACE water (rivers and lakes). ... Recharge can help move EXCESS salts that accumulate in the root zone to deeper soil LAYERS, or into the groundwater SYSTEM. TREE roots increase water saturation into groundwater reducing water runoff. |
|
| 45. |
Realtionship between galactose and manose |
|
Answer» ONG>Answer: maltose in milk |
|
| 46. |
How to find Number of atoms in 12g of carbon 12. |
|
Answer» ONG>Answer: 6.022*10^23 (or) Avagaadro's CONSTANT |
|
| 47. |
The density of 3 molar na2s2o3 is 1.25 gram per ml what is the molality of an na+ and s2o3- |
|
Answer» ong>ANSWER: The density of SODIUM of thiosulphate solution is . CALCULATE and ions. |
|
| 49. |
54g Al and 320g of oxygen gas react to form Al2o3 , calculate mass of Al2o3 formed and identify limiting reagent |
|
Answer» ong>Answer: eNotes Home Homework Help Study Guides Texts Teachers▻ Sign In Join rowseNotessearch Search for any BOOK or any question Chemistry Questions and Answers MENU Aluminum reacts with oxygen in the following chemical reaction: Al + O2 → Al2O3. How many moles of Al2O3 are formed from the reaction of 6.38 mol O2 and 9.15 mol of Al? PRINT Print document PDF list Cite Expert Answers info TUSHAR CHANDRA eNotes educator | CERTIFIED EDUCATOR The chemical equation when aluminum reacts with oxygen is: 4Al + 3O2 --> 2Al2O3 3 moles of O2 REACT with 4 moles of Al to give 2 moles of Al2O3. The ratio of the number of moles of aluminum to the number of moles of oxygen required in the reaction should be 4/3. When 6.38 moles of O2 and 9.15 moles of Al react, the ratio of aluminum to oxygen is 9.15/6.38 = 1.434. This shows that all of the oxygen is consumed before the aluminum and when the reaction ends the reactant aluminum is left. As 3 moles of O2 give 2 moles of Al2O3, the number of moles of Al2O3 formed is 4.25 moles The number of moles of Al2O3 formed is APPROXIMATELY 4.25 moles. |
|
| 50. |
A compd X analayse to C 37.83 percent andCl 55.82 pecent what is the no.of atims hydrogen atoms inthe empricial formula |
|
Answer» ONG>EXPLANATION: బబ భ ట్టు గా కూడా పిలుస్తారు మరియు ఇది ఒక రకంగా చెప్పాలంటే ఈ సందర్భంగా ఆయన మాట్లాడుతూ తమ సంస్థ. ఫఝఫఝబషోష ఫష. |
|