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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. |
Periodicity of electronegativity |
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Answer» Answer: Across a period from left to right theelectronegativity of ATOMS increases. As you move from left to right across the PERIODIC table, atoms have a greater nuclear charge and a smaller COVALENT radius. This allows the NUCLEUS to attract the bonding electrons more strongly. |
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| 2. |
Atomic radius of hydrogen is 37pm. Express it in metres. And explain how does atomic size vary in a group & in a period. |
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Answer» Answer: 37×10^-12m Explanation: 1pm = 10^-12 m 37pm= 37×10^-12m down a group , ATOMIC size increases due to DECREASE in effective nuclear CHARGE. along a period from left to right , atomic size decreases due to increase in effective nuclear charge |
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| 3. |
Elements defenition and example of elements |
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Answer» An element is a SUBSTANCE that is made entirely from one TYPE of atom. For example, the element hydrogen is made from ATOMS containing a single proton and a single electron. ... All isotopes of a particular element have the same NUMBER of protons, but have a different number of neutrons. |
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| 4. |
Calculate the wavelength of first line in Balmer series of hydrogen spectrum? |
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Answer» Answer: The wavelength of the first line of BALMER series in hydrogen atom is `6562.8Å`. The wavelength of the first line of Balmer series in hydrogen atom is `6562.8Å`. Calculate ionisation POTENTIAL of hydrogen and also, the wavelength of first line of LYMAN series. hope it HELPS tq./ Explanation: |
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| 5. |
What is formula of sodium cloride. |
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Answer» Answer: NaCl Explanation: HOPE it helps you please MARK as brainliest and THANK you..... |
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| 7. |
What is Mole? plzzzzzz koi to btao |
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Answer» Moles are lonely, SOLITARY animals that spend their whole lives in burrows and tunnels, except during the mating season or when the mother moles take care of their YOUNG ones. |
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| 8. |
According to which principle there is shift in the equilibrium of gaseous system if pressure isincreased. |
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Answer» pustyujk bhgti be h h k sath HI pda to get a good time and consideration of total charities and in timings for a LONG time ago in this email and series of total income and expenses for test for a few minutes ago in a few minutes and series of total income TAX return is a few minutes ago |
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| 9. |
Matter examples 2 example only i will give u 30 points |
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Answer» EXAMPLES of Matter An apple. A person. Explanation: |
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| 10. |
What is alkyl group |
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Answer»
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| 11. |
Sister this is a place only army office allowed to entry |
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Answer» HELLO.. GOOD MORNING..Yup! MAYBE because that is tanker ryt?? |
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| 12. |
4. What is the maximum number ofelectrons which can be accommodatedN shell |
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Answer» Answer: Each SHELL can contain only a fixed number of ELECTRONS: The first shell can HOLD up to two electrons Explanation: |
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| 13. |
At 27°C the mole of gas is 2 mole.If pressure is 380mm then find the volume of gas |
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| 14. |
है सन्स्वीठा महल लिख्यिOरसन्16परिर्वतन HD(20 लीशावलिए ले सिट्रांस कोउहाहरण शान्ति समाइरएर(7 मान लिसे लहलेooA2509PHजिहा लिखिरकम ऊपल-पल लो उहाहलसमझसPH |
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Answer» Answer: It looks like there aren't MANY great matches for your search Tip Try USING words that might appear on the page that you’re looking for. For EXAMPLE, 'cake recipes' instead of 'how to make a cake'. Need help? Take a look at other tips for searching on Google. Explanation: Hope it's helpful Have a nice day Plz follow and thanks my answers Plz MARK me as brainliest... |
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| 15. |
Why the movement of pollen grains was observed faster in warmer water |
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Answer» Answer: GOOD morning to atted my live session for motivational and IMPROVEMENT in ur life FOLLOW me and earn daily free points... soon link be SHARED so pls stay tuned.... and follow me for more INFO...if u r interested inbox me❤ |
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| 16. |
How do we prepare N/10 hcl solutions:5%of NaOH and fehling's solutions |
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Answer» ⠀⠀ ⠀ ⠀⠀ Procedure The Commercially available Conc. HCl is approximately 11.79 N. Take 8.4 ml of the above HCl and initially dilute it by SLOWLY ADDING drop by drop and STIRRING it in about 500 ml of distilled water. Then make up the volume to 1000 ml in distilled water. |
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| 17. |
Valency of an element in group 2 and group 15 in periodic table. give reason |
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Answer» Explanation: (a) The number of valence electrons in X is 2. For groups 1 and 2, the number of valence electrons is equal to the group number. (b) The valency of X is 2. Valency is determined by the number of valence electrons present in the atom of the element. (c) The number of valence electrons in Y is 5. For groups 13 to 18, the number of valence electrons is equal to (group no - 10). (d) The valency of Y is 3. The number of electrons lost or GAINED by one atom of an element to achieve the nearest inert gas CONFIGURATION GIVES us the valency. FOLLOW ME |
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| 18. |
20. Give the IUPAC names of the following compounds;a) PhCH CH COOHb) CH3CH2CH COCH;c) CH3CH2CH2OC (CH3)3 |
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| 19. |
18. Complete the following reaction(a) 3ROH + PC13(b) ROH + PCL5 |
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| 20. |
Write the resonating structures of NOS(6) Define octet rule. |
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Answer» Answer: The octet RULE is a chemical rule of thumb that reflects the observation that main group elements tend to BOND in such a way that each ATOM has eight ELECTRONS in its valence shell, giving it the same ELECTRONIC configuration as a noble gas. Explanation: hope it helps you |
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| 21. |
2-methyl 2-propanamine on reaction withmixture of sodium nitrite and HCIsolutions give |
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Answer» Answer: Some of the most important reactions of amines are brought about by NITROUS ... by mixing a solution of SODIUM nitrite, NANO2, with a strong acid at 0o UR WELCOME MATE........ |
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| 22. |
Why Acetamide slowly hydrolyze with water but rapidly in the presence of dil. H2SO4? |
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Answer» Technically, hydrolysis is a reaction with water. That is exactly what happens when amides are hydrolysed in the presence of DILUTE acids such as dilute hydrochloric acid. The acid acts as a CATALYST for the reaction between the amide and water. The ALKALINE hydrolysis of amides actually involves reaction with hydroxide ions, but the result is SIMILAR enough that it is still classed as hydrolysis. xXitzMeAngelXx |
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| 23. |
) Calculate the compressibilty factor forCoz if one mole of it occupies ooklitreat 3ook and 40 atm. |
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| 24. |
Propen-1-ol to propen-2-ol |
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Answer» duxgschdgjcdticdghcvjxhftfyfffgf |
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| 25. |
Homogeneous mixture define with example |
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Answer» Answer: MIXTURE which have uniform COMPOSITION THROUGHOUT are called homogeneous mixture. For EXAMPLE- mixture of salt and water. |
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| 26. |
(C)A bullet of mass 20 g is horizontally fired with a velocity 150 m/s from apistol of mass 2 kg. What is the recoil velocity of the pistol? (3) |
Answer» GIVEN :-
To Find :-
Solution :-A bullet of mass 20 g is horizontally fired with a velocity 150 m/s from a pistol of mass 2 kg.
Total mass = M(b) + M(p) = (0.02 + 2) kg = 2.02 kg
Hence, Initial momentum = 2.02 × 0 = 0 Final momentum = M1V1 + m2v2 = 0.02 × 150 + 2 × v2 ...(ii) We know, Initial momentum = Final momemtum ➝ 0 = 0.02 × 150 + 2 × v2 ➝0 = ➝ 0 = 3 + 2v2
➝ -3 = 2v2 ➝ v2 = 0.5m/s ____________________________________ |
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| 27. |
Write the conjugation of mm in acid of so4 2 ion |
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Answer» Answer: Explanation: A conjugate acid, within the Brønsted–Lowry acid–base theory, is a SPECIES formed by the reception of a proton by a base—in other WORDS, it is a base with a hydrogen ion added to it. The conjugate acid of SULPHATE (SO₄²⁻) is hydrogen sulphate (HSO₄²⁻) hope it HELPS u.... follow me ! |
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| 28. |
How molar conductivity is related to conductivity of a solution whose concentration is Cmol-3? |
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| 29. |
out of li, bg, mg, Al cl and p which have completely filled and half filled orbital consequestly large ionisation enthaplies |
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| 30. |
A bo le full of dilute sulfuric acid is le open by accident ,a compound accidentally falls in it and acid suddenly starts flowing out with fizz. Explain the phenomenon by iden fying the compound dropped, with equa on. a) Why does the Plaster of Paris bag le open in the atmosphere lose its se ng property ?Give reason with equa on. b) The pH of an aqueous solu on decreases from 3 to 2. What will happen to the nature of the solu on ? |
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Answer» Answer: If a few drops of a concentrated acid ACCIDENTALLY spill over the hand of a student, wash the hand immediately with plenty of water and APPLY a paste of SODIUM hydrogen carbonate. Water will dilute the acid and wash it out. Any remaining acid will be neutralized with sodium hydrogen carbonate. This will minimize the effect of acid and damage to the SKIN. |
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| 32. |
15* The change in pressure has also an important effect on equilibrium which involve gaseous substancesand there is change in total number of moles of gases in reactants and products. if the pressure of the gaseous system is increased the volume occupied by the system will decrease and the equilibrium will shift towards that direction in which there are lesser no of moles of gaseous substances . Answer the following on the basis of the above paragraph: (i) According to which principle there is shift in the equilibrium of gaseous system if pressure is increased. (ii) If pressure is increased in which direction the equilibrium will shift in the following reaction N2(g) + 3H2(g) 2NH3(g) |
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Answer» Answer: Using LE Chatelier's Principle, we predict that the system shifts to partially COUNTERACT the increase in pressure. Because there are four moles of gaseous REACTANTS for every two moles of gaseous products, the system will SHIFT toward more products. Decreasing the moles of gas will DECREASE the overall pressure. Explanation: |
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| 33. |
Identify the type of bond angle present in IF 5 |
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Answer» JOSH GIGI has been a while ago and I was just wondering if you WANT to be a |
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| 35. |
Calculate the amount of lime88.3%and soda99.2%required to soften24000 litres of water per day for day for a year containing the followingCaco3=1.85 mg/lCaso4=0.34 mg/lMgco3=042 mg/lMgcl2 =0.76 mg/l |
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Answer» sorry i dont know the answer but u can use topper app it is GREAT and u can SELECT LANGUAGE |
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| 36. |
Which is the energy change in galvanic cell |
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Answer» Answer: A GALVANIC (voltaic) cell CONVERTS the ENERGY released by a SPONTANEOUS chemical reaction to electrical energy. An ELECTROLYTIC cell consumes electrical energy from an external source to drive a nonspontaneous chemical reaction. For this galvanic cell, write the half-reaction that occurs at each electrode. ☺ |
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| 37. |
Write expression for combined gas equation? |
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Answer» Answer: The combined GAS law is an AMALGAMATION of the three previously known laws which are- BOYLE's law PV = K, CHARLES law V/T = K, and Gay-Lussac's law P/T = K. Therefore, the formula of combined gas law is PV/T = K, Where P = pressure, T = temperature, V = volume, K is constant. |
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| 38. |
Homogeneous mixture define plz |
Answer» HOMOGENEOUS: A mixture in which the composition is UNIFORM throughout the mixture.HOPE IT IS HELPFUL FOR YOU |
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| 39. |
3,3-dimethyl but-1ene reacted withdiborane in THF and followed by reactionwith H.O. in basic medium gaves Z thenZ is |
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| 40. |
C) Homogeneous mixture |
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Answer» Answer: Here's Your Answer A homogeneous MIXTURE is a mixture in which the COMPOSITION is uniform throughout the mixture. The salt water described above is homogeneous because the DISSOLVED salt is evenly distributed throughout the entire salt water SAMPLE. |
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| 41. |
10. THE VALENCE SHELLELECTRON PAIR REPULSION(VSEPR) THEORY predicts:* |
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Answer» Explanation: Valence Shell Electron Pair Repulsion Theory (VSEPR) is a molecular model to PREDICT the geometry of the atoms MAKING up a molecule where the ELECTROSTATIC FORCES between a molecule's valence electrons are minimized around a central atom. |
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| 42. |
Write a java statement for the following : √(a4+b3)/(a2-b3) |
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Answer» d5 Explanation: FOLLOWING me |
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| 43. |
Whenthe followingsmallest sizeelhand theNet newhich one ofone of the following intheweakestC Compressibility fortor for a gasunder cuitical is?LA ReactionThe oxidation noofmninkmroh h |
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Answer» saaaaaaaaaaaaaaaaaaa |
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| 44. |
A metal ‘M’ is in the first group of the Periodic Table. What will be the formula of its oxide? *1 point(a) MO(b) M2O(C) M2O3(d) MO2 |
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Answer» (B) M2O PLEASE MARK AS BRAINLIEST |
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| 45. |
1 point14. The other name for branchedchain alkanes isO A. ParaffinsO B. IsoparaffinsO C. NeoparaffinsO D. Naphthenes |
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Answer» Answer: A Explanation: Branched-chain alkanes are called isoparaffins. The use of the term "PARAFFIN" is a general term and often does not distinguish between pure compounds and mixtures of ISOMERS, i.e., compounds of the same CHEMICAL formula, e.g., PENTANE and isopentane. |
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| 46. |
The change in pressure has also an important effect on equilibrium which involve gaseous substancesand there is change in total number of moles of gases in reactants and products. if the pressure of the gaseous system is increased the volume occupied by the system will decrease and the equilibrium will shift towards that direction in which there are lesser no of moles of gaseous substances . Answer the following on the basis of the above paragraph: (i) According to which principle there is shift in the equilibrium of gaseous system if pressure is increased. (ii) If pressure is increased in which direction the equilibrium will shift in the following reaction N2(g) + 3H2(g) 2NH3(g) |
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Answer»
The change in pressure has also an IMPORTANT effect on equilibrium which involve gaseous substances and there is change in total number of moles of gases in REACTANTS and products. if the pressure of the gaseous system is increased the volume occupied by the system will decrease and the equilibrium will shift towards that direction in which there are lesser no of moles of gaseous substances . Answer the FOLLOWING on the basis of the above paragraph: (i) According to which principle there is shift in the equilibrium of gaseous system if pressure is increased. (ii) If pressure is increased in which direction the equilibrium will shift in the following reaction N2(g) + 3H2(g) 2NH3(g) |
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| 47. |
VSEPR thoery explains which of the following properrrty of moleculea) size b) shape . c) both of them |
Answer» hey mateUR answer is (b) shapehope this will help U... |
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| 48. |
Helium atom has an atomic mass of 4u and 2protons in its nucleus. how many neutrons does it have? |
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Answer» Answer: 2 Explanation: |
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| 49. |
What type of hybridisation present in NH3 molecules |
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Answer» Answer: Hybridization of NH3 (AMMONIA) NAME of the Molecule Ammonia Molecular Formula NH3 Hybridization TYPE sp3 Bond Angle 107o Geometry Pyramidal or Distorted TETRAHEDRAL |
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| 50. |
What is the difference between emf and potential difference |
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Answer» Answer: The electromotive force transfers the energy in the whole of the CIRCUIT. The POTENTIAL DIFFERENCE is the measure of energy between any two points on the circuit. ... The EMF force gains the electrical energy in the circuit whereas the potential difference loss the electrical energy in the circuit. |
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