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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. |
What is chemical double displacement |
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Answer» ong>Explanation: DOUBLE displacement reactions may be defined as the chemical reactions in which one COMPONENT each of both the reacting molecules is exchanged to form the products. During this reaction, the cations and anions of two different compounds SWITCH places, forming two ENTIRELY different compounds. please make me brainlist Dear and follow me on |
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| 2. |
Draw the structure of 5-sec-butyl-4-isopropylnonane in the window below. |
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Answer» it will HELP you! THANK you |
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| 4. |
Standard lattice enthalpy is higher in Nacl or MgCl2? |
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Answer» ong>EXPLANATION: U(MgCl2) = 2477; U(NaCl) = 769 kJ mol^-1 ... Higher LATTICE energy implies better stability MEANING STRONGER bonds. please make me brainlist Dear and follow me |
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| 5. |
Pls solve.................... |
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Answer» ong>Answer: 5) OBVIOUSLY you need more Oxygen than Ammonia. So but due to less oxygen, EVEN LESSER ammonia gets used up. |
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| 6. |
Good morning friends . Jo friends iss time uthe hua h unn ka liya .or jo abhi soa nahi unm k liya good night |
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Answer» ONG>ANSWER: same to youuuuuuu |
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| 7. |
A 3 mg of salt dissolves in 1 litter of water to form a 1 L of solution, what is the concentration of a solution in ppm? |
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Answer» ONG>ANSWER: xhwthwthwthwthstbsfbwthwhwfhwhdwdhwdgwrgqrgwrhwrhwrh Explanation: 4yjeyjettehwthwthwfhwdgadhwhrafhwrhwrhhwrhwrhwrhwhwhwfhwfbwfbwfwbwfbtwh2thwthwfhteeffefhethwfhthe3thethhwtwthwrh2tģ2rggrwhwrhwrhwrgqrgwrgwrh2rh2rhwrh24h2rh |
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| 8. |
What is the threshold frequency of a metal whose work function is 13.26 x 10-25 J?(h=6.63 * 10-34 Js)• 9*10-8 Hz1x1010 Hz2 x 100 Hz5* 100 Hz |
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Answer» >Answer:-
• Given:-WORK function = • To Find:-Threshold frequency = ? • Solution:-here, h [Planck's constant] = 6.63 × 10 -³⁴ Js Hence, → → → Therefore, the threshold frequency of the metal is |
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| 9. |
IN the laboratory an alkane may be prepared by: a) 3 methodsb) 4 methodsc) 5 methodsd) 6 methods |
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Answer» MATE! there are many methods of ALKANE to be prepared so I think the ANS could be (D) HOPE it helps❤❤ |
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| 10. |
Select the correct answer. A student makes several observations about a piece of iron. Which observation describes a chemical property of the iron? A. Its mass is 52 grams. B. Its density is 7.9 grams/centimeter3. C. It rusts when exposed to air. D. It conducts electricity. |
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Answer» ong>Answer: C. It RUSTS when exposed to air. PLEASE mark me as Brainliest please . |
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| 11. |
Which of these shows spontaneous combustion |
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Answer» ONG>ANSWER: where's the ATTACHMENT? |
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| 12. |
Calculate the amount of each present in solution 2litres of N/10 HCl |
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Answer» ONG>ANSWER: THEREFORE add 8.3 ml of 37% HCL to 1 liter of D5W or NS to create a 0.1N HCL solution. 12M (37% HCL) = 12 moles/L = 12 x 36.5 = 438 g/L = 438 mg/m Explanation: |
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| 13. |
Please answer this it's urgent.... What happens when crystal of sodium carbonate us added into dilute HCl ?? give reaction .....!! |
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Answer» ong>ANSWER: |
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| 14. |
What are the similarities between compounds and mixtures? |
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Answer» ONG>ANSWER: Types of matter: elements, COMPOUNDS, homogeneous and heterogeneous mixtures. Both elements and compounds are called pure substances because they contain only one type of molecule. A mixture CONTAINS TWO or more types of pure substances. The molecules of these substances do not form any chemical bonds in a mixture. |
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| 16. |
3.Copper metal rects with conctrated HNO, as Cu + 4HNO, 4 Cu(NO3)2 + 2NO, + 2H,0 .The number of moles of the HNO, reducedby one mole of the Cu will be1) 4 2) 2 3) 0.5 4) 0.25 |
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Answer» ong>ANSWER: answer is option 2 for your QUESTION |
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| 17. |
1. On what basis a thing is called "matter' ?Space andm2. (a) Define matter. Pg -(b) What is matter composed of ? důny particals(c) Which of the following are not regarded as matter andwhy? Electricity, smell, mercury, oxygen, taste, milk.3. What are the characteristics of :(a) matter (b) particles |
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Answer» ong>ANSWER: Explanation: Anything that occupies space and has mass is called matter. Matter can exist in three physical states—solid, liquid, and gaseous.
Chair and ALMOND are forms of matter in the solid state.
Cold drink is a liquid state of matter.
Air is a gaseous state of matter.
Note: The sense of SMELL is not matter. HOWEVER, the smell or odour of a substance is classified as matter. The smell of any substance (say, perfume) can be classified as matter. This is because, perfume is in liquid state inside the bottle. It comes out in the form of tiny droplets. These droplets of perfume are matter and spread out in the atmosphere to CREATE a sense of smell. This smell can be detected by our olfactory system. |
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| 18. |
The ratio of number of non-metal atoms to The ratio of number of non-metal atoms to the metal atom on Anglesite is metal atom on Anglesite is |
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Answer» ONG>Answer: The ratio of number of non-METAL atoms to The ratio of number of non-metal atoms to the metal atom on ANGLESITE is metal atom on Anglesite is. |
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| 19. |
What are the similarities between elements and compounds? |
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Answer» ong>Explanation: A compound contains ATOMS of different elements CHEMICALLY combined TOGETHER in a fixed ratio. An element is a pure chemical SUBSTANCE made of same type of ATOM |
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| 20. |
Hey I need your help please guys so fast urgent |
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Answer» ong>Answer: |
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| 21. |
Please answer this it's urgent...Need explanation |
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Answer» ong>Answer: |
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| 22. |
Please answer this it's urgent..Explanation is also required. |
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Answer» ONG>Answer: The reaction of an acid with a BASE is called a NEUTRALIZATION reaction. These all are correct. Explanation: |
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| 23. |
Plzzz help meI will pray to god that you get well soon |
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Answer» ong>Answer: |
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| 24. |
The loops in Ptolemy's ____model, and those shown on the video, are called _____ motion. This phenomenon is caused by Earth's____ orbit than those of other planets. Options:A) Heliocentric B) GeocentricC) Retrograde Where do they go? |
Answer» ONG>ANSWER:answer isa- HELIOCENTRIC |
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| 25. |
4. In which of the following reactions does water behaveas an acid?please help it's urgent |
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Answer» ong>Answer: |
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| 26. |
In which of the following experiment, residue left behind is reddish brown. a) Heating of copper powder in air b) Heating of ferrous sulphate crystals c) Heating of magnesium in air d) Heating of solid calcium carbonate |
| Answer» ONG>Answer: | |
| 27. |
5. Consider the followingAH= u kJ/molsolAB(S)→ A*(aq) + B (aq)AHLE = w kJ/mol= v kJ/molhydrationΔΗA*(g) + B(g)The correct relation between u, v & w is[NCERT Pg. 180](1) w = y + u(2) u = W + V(3) v = 2(u + W) (4) v = w + u |
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Answer» ONG>Answer: a lot more to the f and the question 2that is a more important issue to LR in this |
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| 28. |
At 100°C Vapour Pressure of aqueous solution (havingnon-volatilesolute) is 750 mm of Hg. Whatis molality of solution? |
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Answer» ONG>Answer: The vapour pressure of an aqueous SOLUTION of glucose is 750 mm of Hg at 373 k . Calculate the molality and mole fraction of SOLUTE. shivanshyadav48035 is waiting for your help. |
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| 29. |
For the rein the (g) + Br 2 - 2 HBr 14Allf - - 72-8 kiltmolethen bly for the rearA |
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Answer» ong>ANSWER: |
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| 30. |
3 12. Correct expression of enthalpy of combustion is[NCERT Pg. 176](1) C2H6(g) + O2(g) → 2CO(g) + 3H20(1)(2) C(s) +-02 (9) --CO(9)2(diamond)4(3) C(s) +-02 (9)--CO (9)graphite2(4) S(s) + O2(g) →S02 (9)rhombic |
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Answer» ong>Explanation: C
H 6
(g)+ 2 7
O 2
(g)→2CO 2
(g)+3H 2
O(l) Here heat of combustion for TWO mole of C 2
H 6
=3120 kj , So for ONE mole of C 2
H 6
=1560 kj Now we know that ΔH reaction 0
=ΣΔH f 0
Product−ΣΔH f 0
Reactant Now USING this formula -1560 = (−2×395−3×285)−X So X = -85 KJ / mol -X = 85 |
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| 31. |
A green coloured hydrated metallic salt on heating loses water of crystallization and gives a mixture of gases with suffocating smell.What is left in the test- tube after the reaction ? |
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Answer» ong>Answer: A green coloured hydrated metallic salt on heating LOSES its WATER of crystallisation and gives the smell of burning sulphur. ... A green coloured hydrated metallic salt on heating loses its water of crystallisation and gives the smell of burning sulphur. Explanation:
May this helps you GUYS!!! |
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| 32. |
What will happen if you put a raisin (dry grapes) into a hypertonic solution? |
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Answer» ong>Explanation: When raisins are kept in a hypertonic solution, then exosmosis will occur, i.e., WATER will move out from raisins from lower solute concentration to HIGHER solute concentration through raisin covering. Due to this, raisins will SHRINK. |
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| 33. |
Q- Explain the AUFBAU'S priciple exceptional?Ans. correctly and take points.. |
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Answer» align="absmiddle" alt="\huge\sf{answer-:}" class="latex-formula" id="TexFormula1" src="https://tex.z-dn.net/?f=%5Chuge%5Csf%7Banswer-%3A%7D" title="\huge\sf{answer-:}"> The Aufbau principle dictates the manner in which electrons are filled in the atomic orbitals of an atom in its ground state. It states that electrons are filled into atomic orbitals in the increasing order of orbital energy level. According to the Aufbau principle, the available atomic orbitals with the lowest energy levels are occupied before those with higher energy levels. EXCEPTIONS-:Like most rules, there are exceptions. Half-filled and completely filled d and f subshells add stability to atoms, so the d and f block elements don't always FOLLOW the principle. For example, the predicted Aufbau configuration for Cr is 4s23d4, but the observed configuration is actually 4S(power1)3d(power5). This actually reduces electron-electron repulsion in the atom, since each electron has its own seat in the subshell. |
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| 34. |
Using the values of the physical constants given inside the front cover of this book, calculate RH and compare the result to its experimental value, 109 677 .6 cm-1 |
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Answer» ong>Answer: Using the modern values of h, c, and k8 given INSIDE the front cover, we ... values of k8 , h, and c given inside the front cover, the calculated value of a is ... 1- 7 Using the values of the physical constants given inside the front cover of this book, calculate RH and COMPARE the result to its EXPERIMENTAL val ue, 109 677 .6 cm- 1. MARK me as brainliest... |
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| 35. |
Is the set of quantum number permitted or not permitted = i] n=3 , l=2 , m=0 , s= -1/2ii] n=4 , l=2 , m=3 , s= +1/2 |
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Answer» ong>Answer: answer 1 n=4,l=2,m=3,s=+1/2 Mark as BRILLIANT ant |
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| 37. |
Which of one is not metalloids |
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Answer» ONG>ANSWER: OPTION is not there. also which doesnot show both metallic and non metallic BEHAVIOUR they are not metalloids |
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| 38. |
F AH = a= d.P12. AH = bAH = dAH = C(B.On the basis of Hess's law of constant heat summation, choose the correct relation:(1) b = a -d + c(2) c = a - b + d(3) d = a + b + c(4) a-c = b + d |
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Answer» ong>ANSWER: MARK MY ANSWER AS BRAINIEST PLEASE Explanation: (4) a-c = b + d |
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| 39. |
Solve step by stepfor question refer the attachment. |
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Answer» ong>ANSWER: this is so BIG answer ... sorry I can't do it |
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| 40. |
UTC (4) a - c = b + d13. In which of the following AH = AU?(1) N. (9) + 3H2(g) → 2NH,(9)(3) PCI;(9) - PCI;(9) + Cl2(9)14. Heat of combustion of CH4, CH4 and C. Ha are 890,(2) C(s) + O2(9) -CO2(9)(4) CaCO3(s) - Cao(s) + CO2(g) |
Answer» ONG>ANSWER:
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| 41. |
Please solve step by step.For question refer the attachment. |
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Answer» ong>Answer: The equivalent mass of a certain bivalent metal is 20. The MOLECULAR mass of bivalent metal will be double of the equivalent mass. It will be 2×20=40. The metal is bivalent. So 1 MOLE of metal atoms will COMBINE with 2 moles of chlorine atoms. M+Cl2→MCl2 The atomic mass of chlorine is 35.5 g/mol. The molecular mass of its anhydrous CHLORIDE will be 40+2(35.5)=111 g/mol. hope it will HELP u✌ |
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| 42. |
What is the importance of periodic table in every day life |
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Answer» ong>Answer: |
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| 43. |
15. The heat of neutralisation of four acids P, Q, R, S are -13.7. -9.4.-11.2 and -12.4 kcal, respectively when they are neutralised by a common base. The acidic character obeys the order(1) P>Q > R > S(2) PSR>Q(3) S > R > Q > P(4) S >> RPfore |
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Answer» ONG>ANSWER: hsjsisidjdhxgsyauquwhdvhdususuw |
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| 44. |
Solve accordingly with proper step.For question refer to the attachment. |
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Answer» ong>Answer: 12 kg of free FIRE ok make me |
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| 45. |
What happens when a negative energy touches a positive energy |
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Answer» ONG>ANSWER: They will ATTRACT to each other |
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| 46. |
2.1 WHAT IS UNDERSTANDING THE CHEMICAL PROPERTIES OF ACIDS AND BASES ?2.1.1WHAT IS ACIDS AND BASES IN THE LABORATORY?2.1.2HOW DO ACIDS AND BASES REACT WITH METALS? |
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Answer» ONG>Answer: Chemical Properties of Bases Bases change the colour of litmus from red to blue. They are BITTER in taste. Bases lose their basicity when mixed with acids. Bases react with acids to FORM salt and water. ... They can conduct electricity. Bases feel slippery or soapy. Some bases are great conductors of electricity. |
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| 47. |
Calcium carbo (e)5. Give the names of the elements present in the followingcompounds.(a) Quick lime(b) Hydrogen bromide(c) Baking powder(d) Potassium sulphate. |
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Answer» ong>Answer: Elements present a)Quick lime CaO Calcium, Oxygen b)HYDROGEN bromide HBr Hydrogen, Bromine c)Baking powder NaHCO3 SODIUM, Hydrogen, Carbon, Oxygen d)Potassium sulphate K2SO4 Potassium, Sulphur, Oxygen |
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| 48. |
Q:- Define AUFBAU's principle in points..Ans correctly..Need it.. |
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Answer» ong>Answer: The Aufbau Principle states that in the GROUND state of an atom, an electron ENTERS the ORBITAL with lowest energy first and subsequent electrons are fed in the order of increasing energies. The word 'aufbau' in German means 'building up'. Here, it refers to the filling up of orbitals with electrons. |
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| 49. |
Separate mixture of sugar and sand |
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Answer» ong>Answer: hope it helps you.. Explanation: The sugar WOULD dissolve in water. You could then pour off the solution and wash the remaining sand with a BIT more water. HEAT the water to evaporate it from the sugar, and the TWO are separated. |
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