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. |
How avogadro's law helps in determining the atomicity of elements |
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Answer» tion:Avogadro hypothesis states that equal volume of all gases under similar CONDITIONS of temperature and pressure contain equal number of molecules. One of the applications of Avogadro's LAW is to calculate atomicity of elementary gases. ... For example oxygen molecule has two oxygen atoms. So, atomicity of O2 is 2. |
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| 2. |
what are the postulates of Bohr's model of hydrogen atom discuss the importance of this model to explain various series of line spectra in hydrogen atom |
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Answer» : The electron in an ATOM revolve round the nucleus in CERTAIN fixed circular paths called ORBITS. 2] Each ORBIT is associated with energy is called energy level |
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| 3. |
Bulk fixation of carbon through photosynthesis takes place in |
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Answer» OceansExplanation:OCEANS covers a LONG portion of EARTH. The OCEAN is large amount of organisms which include both PRODUCERS and consumers |
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| 4. |
Back diffusion occurs mostly in which chromatography |
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Answer» Representation of band or peak broadening that results from longitudinal diffusion. ... But the other is still its ability to diffuse in a RANDOM manner from one point to another. All COMPOUNDS moving through a chromatographic COLUMN MUST exhibit some DEGREE of longitudinal diffusion broadening. |
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| 6. |
Calculate the energy of one mole of photons of radiation whose frequency is 5*1014 |
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Answer» 3.3462 *10^-30Explanation:ENERGY = HV= 6.62*10^-36*5*1014=3.3462*10^-30 |
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| 7. |
Calculate the area of thr hexagon formed by particles at t= |
| Answer» TION:PLEASE COMPLETE your questionThank you | |
| 8. |
Breakdown of water molecule is physical change or chemical |
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Answer» chemical change but reversiblehope it helped and PLS mark as BRAINLIEST:) |
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| 9. |
Balanced chemical equation for phosphorus pentachloride + water |
| Answer» PHOSPHORIC ACID + HYDROGEN CHLORIDE | |
| 10. |
At 27 c and 1 atmosphere pressure N2O4 is 20% dissociated into NO2 find kp |
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Answer» : The value of for this REACTION is, 0.2Solution : Given,INITIAL pressure of = 1.42 barInitial pressure of = 2.87 bar = 0.036The given EQUILIBRIUM reaction is, Initially 1 0At equilibrium The expression of will be,where, = degree of dissociation = 20 % = 0.2Now put all the given values in the above expression, we GET:THEREFORE, the value of for this reaction is, 0.2 |
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| 11. |
in an airtight experiment set up which was used by you in the laboratory to study respiration in germinating seeds the seeds obtained the oxygen for respiration from |
| Answer» EXPLANATION:WATER USED for SOAKING the SEEDS | |
| 12. |
Write in ionic form HNO3 |
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Answer» H+ and CL -Explanation:Its OVERALL charge is 0 because it is an IONIC compound. The TWO ions in it are H+ and NO3- |
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| 13. |
HEYA MATES HERE IS YOUR QUESTIONState Dalton's law of partial pressures.Calculate the total pressure exerted by a mixture of 8g of O2 and 4g of H,enclosed in a vessel of 1 dm3 at 27 °C. R = 0.083 bar dm K-mol-. |
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Answer» In chemistry and physics, Dalton's law (also called Dalton's law of PARTIAL PRESSURES) states that in a mixture of non-reacting gases, the total PRESSURE exerted is equal to the sum of the partial pressures of the INDIVIDUAL gases. ... and is related to the ideal gas laws. |
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| 14. |
An element A has two electrons in its outer shell while element B has seven electron in its outer shell 1: what will be the formula of compound formed between A and B ?2: What will the nature of chemical bond formed?3: Will this conduct electricity |
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Answer» 1. FORMULA :- AB22. Ionic bond( not SURE )3. When DISSOLVED in water then only it will CONDUCT electricityGood DAY |
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| 15. |
Calculate the number of 254g of iodine atomic mass of iodine 127u |
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| 16. |
Is there any short trick 2 find the quantum nk |
| Answer» YES ,.Explanation:n is principal number ,l is EQUAL to (n-1) ,M is equal to ( 2l-1) S is spin number. +1/2 for 1 E and - 1/2 for SECOND e | |
| 17. |
Hi friends. help me in this. . . ..... |
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Answer» we have to desinate the GIVEN SUBSHELL with n=4 MEANS MULTIPLY it |
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| 18. |
Hey.... ans only if u know If the velocity of an electron in a bohr orbit of hydrogen is given by V, then find n |
| Answer» MVR =nh/2×3.14 so N = mvr×2×3.14/h | |
| 19. |
Short Answer Type Questions: 1. Give reason why:(a) Copper metal is used for making electric wires.(b) Graphite is used for making electrode in a cell.(c) Sodium and Potassium are stored in kerosene.(d) Copper cannot displace Zinc from its salt solution. |
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Answer» a.beacause copper has a good CONDUCTOR of an electricity b.beacause graphite is also good conductor. c.when SODIUM and potassium store in kerosene it can not burn. d.copper is less REACTIVE than zink |
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| 20. |
Hiiiii can anyone answer me this 2 plssssss |
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Answer» Water has a COOLING effect as it has HIGH specific heat capacity, so it can retain its coolness fora long TIME. While STEAM causes severe BURNS to our skin because it has high specific heat capacity so it can accomate more amount of heat.Explanation: |
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| 21. |
Colloidal solution FiltrationFig. 1.3.RESULTS1. Beaker A - Common salt forms a true solution in water.2. Beaker B - Sugar forms a ...in water.3. Beaker C - Alum forms a ........in water.4. Beaker D - Soil forms a .....in water.6. Beaker E-Chalk Powder forms a ...in water.6. Beaker F - Fine sand forms a ... ... in water.... in water.7. Beaker G-Starch forms a ......... in water.8. Beaker H - Egg albumin forms a ...PRECAUTIONS |
| Answer» FORM a TRUE SOL.d.e.f form a SUSPENSION g.h form a COLLOIDAL sol | |
| 22. |
Among sulphurous and sulphuric acid which is stronger and why |
| Answer» SULPHURIC ACID is more strongest or REACTIVE because it has more molecular mass as compared to SULPHUROUS Acid | |
| 23. |
All aldehydes structural formula in carbon and its compounds |
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Answer» Nomenclature of CARBON and its compoundsNumber of C ATOMS COMPOUND Name2 C2H6 Ethane3 C3H8 Propane4 C4H10 Butane5 C5H12 Pentane |
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| 24. |
What do we observe when Iodine crystals are heated in a test tube ? . |
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Answer» When IODINE CRYSTALS are heated, the van der waals are easily overcome and the MOLECULE breaks into gas phase. They sublime and form a PURPLE colored DENSE vapor. |
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| 25. |
How can both the components of tincture of iodine be separated (mixture of iodine and alcohol)? |
| Answer» TION:i HOPE that this ANSWER HELPS you MATE.. | |
| 26. |
1% hypochlorite contain how much amount of chlorine |
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Answer» For a SOLID BLEACH, 100% active chlorine is equivalent to 14.1 mol/kg ClO−: LITHIUM HYPOCHLORITE has a molar mass of 58.39 g/mol, equivalent to 17.1 mol/kg or 121% active chlorine. |
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| 27. |
How many elements were known when mendeleev started his work on his periodic table? |
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Answer» During Mendeleev's work, only 63 elements were known. After STUDYING the PROPERTIES of every ELEMENT, Mendeleev found that the properties of elements were related to atomic MASS in a periodic way. |
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| 28. |
How measure the ionisation potential of hydrogen atom |
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Answer» Divide the MASS being ionized, in grams, by the ATOMIC mass number. If you have 24 grams of oxygen, for example, which has an atomic mass of 16, you have 1.5 moles. Multiply the ionization energy you LOOKED up by 96.485. 1 eV/particle is EQUAL to 96.485 kJ/mol. |
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| 29. |
How many kg of energy emit during melting of 1 kg ice in to water |
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Answer» The AMOUNT of heat required to melt 25 GRAMS of ICE is 8350 JOULES or 2000 calories. |
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| 30. |
What is electronic confrigration? |
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Answer» inly user here is your ANSWER The arrangement of ATOMIC orbitals is known as electronic configuration if you LIKED my answer then don't FORGET to MARK as brainliest answer |
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| 31. |
Hello there..... your question is here.... answer both the questions..... no spam ....need AnSWER in explained way... |
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| 32. |
Extraction of essential oil from saunf, ajwan and Ilaichi |
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Answer» Combine the petroleum ether extracts in a 250 ml conical flask and dry it with the HELP of anhydrous SODIUM sulphate. REMOVE the solvent from the dried filtrate by CAREFUL distillation in a water bath. The essential OIL is left behind in the distillation flask. Find the weight of the extracted essential oil. |
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| 33. |
1. Why do we see water droplets collected on the outer surface of a glass container, containing ice?Which time of clothes we should wear in summer? Why? |
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Answer» 1. We SEE water droplets collected on outer surface of a glass container, containing ice because air molecules LOSSES ENERGY and then mix in air.2. We should wear cotton cloths during summer because cotton cloths are gud conducter of heat and black cloth are bad conducter of heat.if you like my answer So PLZ MARK me As a brainlist |
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| 34. |
The ratio of the difference in energy between first and second Bohr orbit to that between second and third Bohr orbit in H-atom is :-(1) 4/9(2) 1/3(3) 27/5(4) 1/2 |
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Answer» (2) 1/3 is the RIGHT answerExplanation:LET E¹ be energy ASSOCIATED from FIRST ORBIT to second.Therefore, E¹ = -Rydberg's constant*(1/1 - 1/2)= = -Rydberg's constant*(1/2). --- (i)Let E² be energy associated from second to third orbit.Therefore, E² = -Rydberg's constant*(1/2 - 1/3)= -Rydberg's constant*(1/6) --- (ii)Divide (ii) and (i) :-We get 1/3 |
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| 35. |
Name two elements you should expect to show chemical and physical property similar with alluminium |
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Answer» Elements in the same group in the periodic table have similar chemical properties. This is because theiratoms have the same NUMBER of electrons in the highest occupied ENERGY level. Group 1 elements are reactive metals CALLED the ALKALI metals. Group 0 elements are unreactive non-metals called the noble gases. |
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| 36. |
Elements in 17th group In the periodic table shows similarity in their properties |
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Answer» The halogens are all ELEMENTS that are found in group 17 of the periodic table. The halogens INCLUDE fluorine,chlorine, BROMINE, iodine, and astatine. All of these elements are considered to be reactive nonmetals. Atoms of an element react with other atoms based on the number of electrons found in their outer orbit. |
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| 37. |
Which method is used to separate insoluble impurities |
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Answer» For insoluble impurities, filter the HOT solution using a glass funnel LIGHTLY plugged with COTTON. The method of HEATING water to separate soluble impurities is called distillation |
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| 38. |
Which property of an element is not variable? |
| Answer» ATOMIC mass will be the answer. ... ALUMINIUM + sodium HYDROXIDE + water gives sodium meta ALUMINATE + hydrogen. ... Classifucation of ELEMENTS and its periodic properties. | |
| 39. |
Why hydrogen atom of chloroform is acidic but that of methane is not ? |
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Answer» Hydrogen ATOM of chloroform is definitely ACIDIC, but that of methane is not. ... Hydrogen atom of chloroform is acidic due to three electronegative chlorine ATOMS present on CARBON. |
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| 40. |
Glucose labeled at 1st carbon will be seen in pyruvuc acid at |
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Answer» found that the labeled CARBON was almost quantitat,ively recovered as COZ ... to prepare RADIOACTIVE GLUCONATE from labeled glucose |
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| 41. |
What is the electronic configuration of Pd and how give reason ? |
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Answer» [Kr] 4d¹⁰palladium is a d-block element.due to this, the electrons get filled progressively in 4-d ORBITAL.In palladium, the 4D orbital is completely filled.hope it HELPED and pls MARK as brainliest:) |
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| 42. |
Give two examples of diffusion |
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Answer» tion:You can SMELL perfume because it diffuses with air.Few crystals of potassium permanganate in WATER will diffuse and TURN the water purple it is an ANOTHER example.Hope it HELPS you. |
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| 43. |
Explain production of x-ray |
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Answer» Radiation-producing devices produce X-rays by accelerating electrons through an electrical voltage potential and stopping them in a target. • MANY devices that USE a high voltage and a source of electrons produce X-rays as an unwanted byproduct of DEVICE operation. These are CALLED incidental X-rays. |
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| 44. |
Which of the following statement is false :- (A) Elements of 18th group are nonmetals(B) Elements of d -block are metals(C) Elements of actinoide series are radioacitve(D) Elements of s-block are metals only |
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Answer» inly USER Here is your ANSWER The answer is option 1 because 18 th group are inert gases they are neither metals nor nonmetals if you LIKED my answer then don't forget to mark as BRAINLIEST answer |
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| 45. |
A salt 'X' is dissolved in water of pH = 7. The resulting solution becomes alkaline in nature.The salt is made up of -(1) A strong acid and strong base(2) A strong acid and weak base(3) A weak acid and weak base(4) A weak acid and strong base |
| Answer» 4 PART is the ANSWER........ | |
| 46. |
Why is 98% conc. HNO3 called fuming nitric acid? |
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Answer» tion:98% conc HNO3 is highly CONCENTRATED. it has so LITTLE water that the REMAINING water tries to escape. so, it fumes |
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| 47. |
Oxdiation nomber SO4 |
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Answer» e here is your ANSWER------------------------ ✔️✔️ The SUM of the oxidation numbers in a polyatomic ion is equal to the charge on the ion. The oxidation NUMBER of the sulfur atom in the SO42- ion must be +6, for example, because the sum of the oxidation numbers of the ATOMS in this ion must equal -2. ........Hope it helps ❣️❣️ ROYAL |
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| 48. |
What do you mean by 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. If you change the number of PROTONS an atom has, you change the type of element it is. ... These different versions of hydrogen are CALLED isotopes |
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| 49. |
What is atomic number? |
| Answer» TION:atomic NUMBER is defined as the number of ELECTRONS present in an ATOM number of PROTONS present in an atom | |