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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. |
How fast is an electron moving if it has a wave number is equal tothe square of distance it travels in one second ?(A) |
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Answer» THANK you!! |
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| 2. |
Matchfollowinga) WaterB) Ammoniac) carbon Dioxided) Sulphera) 14 :3b) li8C) 1:7D) 3.8 |
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Answer» A)water - B) li8 B) Ammonia - D) 3:8 D) SULPHER - C) 1:7 please FOLLOW up me |
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| 3. |
Which one of the following region of electromagnetic radiation is the highest energy radiation ?a) Visible b) Ultraviolet c) Infra red d) X-ray |
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Answer» B.................... ....... |
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| 4. |
For the 'H' atom electron in 2nd bohr orbit, the ratio of radius of orbit its to de-Broglie wave length is(A)1(B)2.TE(C)27(D)AB |
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Answer» As we know that, In nth orbit of HYDROGEN ATOM, Now, Velocity would be, Also, The de-Broglie WAVELENGTH is GIVEN by, Hence, the CORRECT answer is option 1 (n/2π) !! ________________ |
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| 5. |
Atoms of eight elements A, B, C. D. E. EG and H have the same number of electron shells but different number of electrons in their outermost shells. It was found that elements A and G combine and B are basic in nature while those of E and F are acidic. The oxide of element D is almost (c) Which one of the eight elements would have the largest atomic radius?to form an ionic compound which can also be extracted from sea water, Oxides of the elements Aneutral. Answer the following questions based on the information given here in (a) To which group or period of the periodic table do the listed elements belong? (b) Which one of the eight elements is likely to be a noble gas?(c) Which one of the eight elements would have the largest atomic radius?(d)Which two elements amongst these are likely to be non-metals? (e) Which one of these eight elements is likely to be a semi-metal or a metalloid? |
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Answer» Answer: Explanation: ⇒ Number of given elements are 8. They are A,B,C,D,E,F,G and H. ⇒ All 8 elements are belongs to same period because they have same number of electronic shells and have DIFFERENT number of electrons in the outermost shell. ⇒ We can see the above PATTERN in 3 rd period as it have 8 elements. ⇒ Nature of compound FORMED by a combination of element B and F is ionic in nature since B is METAL and F is non-metal. ⇒ Here ⇒ A=Na (Sodium), B=Mg (Magnesium), C=Al (aluminium), D=Si (Silicon), E=P (Phosphorus), F=S (Sulphur), G=Cl (Chlorine), H=Ar (Argon). |
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| 6. |
Mpounds.Oxidation - Reduction Reactionschemical reactions in which the oxidation-reduction (lans) takes place simultaneously are called oxidation - redns.CuSO4(aq) + Znisrall ionic equation is→ ZnSO4(aq) + Cuis)decrease in oxidation stateCU 4→Zn(aq)+ Cus)+ Zn(s)increase in oxidation state +2creactions are made up of two half reactions, for exan |
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| 7. |
Which one of the following is the centrifugal force balancing the coulombic force of attraction of anelectron revolving in a circular orbit of hydrogen atom |
Answer» It's RIGHT MATE which is WRITTEN above |
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| 8. |
A microscope using suitable photons is employed to locate an electron in an atom within a distance of0.1A". What is the uncertainityinvolved in the measurement of its velocity?(A) 5.79 x 10°m/s(B) 5.79 x 108m/s(C) 5.79 x 10m/s(D) 5.79 x 101°m/s |
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Answer» d is your answer MAYBE it's HELPFUL for you ithink so SORRY if this is WRONG |
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| 9. |
Question No. 24Select the correct statements among the followinga. Copper glance is a sulphide ore of copperb. The reduction of zinc oxide is done using cokec. Zinc is used for galvanizing irond German silver contains Ni metal as major componentO a and b onlyOb and d onlya, cand d only0 a, b, cand d |
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| 10. |
Tatement 1: Reaction of lithium with water is less vigorous than sodium and other alkali metatatement II : Lithium has most negative E value than sodium and other alkali metals(A)Both statements are correct(B) Both Statements are wrong(c)Statement l is correct, Statement || is wrong(D)Statement I is wrong. Statement II is correct |
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Answer» bye I will tell the answer |
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| 11. |
How fast is an electron moving if it has a wave number is equal tothe square of distance it travels in one second ?(A)h(B)mhm2(C)h(D)hV 2KE |
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| 12. |
Heisenberg's uncertainity principle is given mathematically asAx x Amur) To observe minimum uncertainty the value of 'n' must be(A) 1( B)4(C) 6(D) 3 |
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| 13. |
Select the incorrect limitation of Ellingham diagram among the followingThe graph simply indicates whether a reaction is possible or notO It gives idea about kinetics of the reduction processIt is based on thermodynamics conceptsO AH and AS values for any chemical reaction remain nearly constant even on varying temperature. |
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Answer» Answer: G vendéen de la KOTI chosna grand MERCI POUR votre réponse JE vous remercie de votre réponse je vous remercie de votre réponse je vous remercie de votre réponse je vous remercie de votre réponse et je vous remercie de votre réponse je vous souhaite un bon de la koti de la |
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| 14. |
A hollow sphere coated inside with platinum Black and has a small hole in it nearly acts as a blackbody becausea) It emits only certain frequencies of radiationb) It absorbs only certain frequencies of radiationc) It emits all frequencies but absorbs only certain frequencies of radiationd) It emits and absorbs all frequencies of radiation |
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| 15. |
14.625 mg of NaCl is treated with AgNO3(aq).The mass of AgCl obtained as ppt is (Ag = 108g/mol)(1) 143.5 mg(2) 71.75 mg(3) 40.25 mg(4) 35.875 mg |
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Answer» DONT no Explanation: SOORY ............ |
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| 16. |
Do you understand by the term “basicity of an acid”?Give two examples of (i) monobasic acidsequations.(ii) dibasic acids (iii) tribasic acids. Support your answer by ionic equations. |
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Answer» ...................... |
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| 17. |
The wavelength of the electromagnetic radiation of frequency 103kHzisa) 30.0m b) 3.0m c) 300.0m d) 3000.0m |
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Answer» Answer: REGION Wavelength Frequency X-ray 1 nm 3 × 1017 Hz X-ray/Ultraviolet 10 nm 3 × 1016 Hz Ultraviolet 100 nm 3 × 1015 Hz |
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| 18. |
The electrical discharge through the gases in cathode ray discharge tube was observeda) very low pressure of the gas and high voltageb) very high pressure of the gas and high voltagec) very low pressure of the gas and very low voltaged) very high pressure of the gas and very low voltage |
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Answer» OPTION a Explanation: |
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| 19. |
What is observed when zinc granules are added to dilute sulphuric acid.a. a precipitation is formedb. the reaction mixture turns yellowc. the container becomes hotd. the container becomes cold |
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Answer» Hola there... Muskaan is here for you... Answer :- When DILUTE sulphric acid reacts with ZINC granules, then zinc sulphate and hydrogen gas are formed. Zinc being more reactive than hydrogen, displaces it from sulphuric acid. This liberated hydrogen is evolved as hydrogen gas. dilute sulphric acid reacts with zinc granules, then zinc sulphate and hydrogen gas are formed. Zinc being more reactive than hydrogen, displaces it from sulphuric acid. This liberated hydrogen is evolved as hydrogen gas.Thus, the container becomes hot . Hope it HELPS you... |
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| 20. |
Ammoniated solution of sodium on long standing gives(A) Only sodamideB Sodamide and hydrogen gas(C) Sodium hydroxide and ammonia(D) Sodium hydroxide and H2 (g)cor |
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Answer» Sodamide and hydrogen GAS Hope it help you .............. .......... |
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| 21. |
Which of the following process is not involved in the calculation of standard electrode potential (E0) of alkali met:(A) Hydration energy(B) Sublimation energy(C)Electron gain enthalpy(D) lonization enthalpyAB.С |
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| 22. |
Incorrect match of charge on colloid isO CdS : Negatively charged solO Charcoal : Negatively charged solTio, sol. Positively charged solO ALO3-XH20 Negatively charged sol |
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Answer» Answer: B Explanation: BECAUSE THE MENTION ELEMENTS HAVE NOT -VE CHARGE SO THIS IS INCORRECT MATCH MARK ME AS BRAINLIST PLEASE ! |
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| 23. |
2NO(g)+Cl₂(g)⇔2NOCl,the equilibrium constant of the reaction is1)kc=[NOCl]²/[NO]²[Cl₂]²,2) kc=[NOCl]²/[2NO]²[Cl²],3) kc=[NOCl]²/[NO]²[CL²],4) [2NOCl]/[2NO][Cl]. |
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Answer» what is this ???????????? |
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| 24. |
I ne de-Broglie wavelength of an electron in anorbit representedby the orbital diagram is(A) 10A0(B) 20 A0(C) 6.66 Ad.13.32 A |
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Answer» b is the BEST answer for your question please MARK my answer as brainliest answer I will follow you |
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| 25. |
Find odd man outDecomposition,reduction, oxidation, catylast |
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Answer» catalyst. hope it HELPS.... |
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| 26. |
Calculate %W/W & Density from Molarity and Molality1 Molality of 2.46M Hydroxyl Amine solution is 2.635m. Calculate its density, Strengthand %WM. |
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Answer» qqqqqqqaq qqqqqqqaqqwyedgs |
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| 27. |
The oxidation state of 'K' and 'O' in KO respectively are(A) 0,0(B) -1,-1(C) 0,C,-2(D) +1,1/2 |
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Answer» ANSWER: option (D) +1,1/2 |
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| 28. |
13. An element ‘T’ has the electronic configuration - 2, 8, 18, 3. Predict the following for ‘T’:(a) Position of this element in the Modern Periodic Table.(b) Which type of ions it will form during chemical reactions?(c) Write the symbol of the ion, illustrating its formation.(d) Write the formula of its chloride and oxide. |
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Answer» Answer: Ga element COVALENT bonds Explanation: will help you |
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| 29. |
The uncertainity in position of an electron isequal to its de-broglie wave length. Theminimum percentage error in itsmeasurement of velocity under thiscircumstance will be approximately(A) 4(B) 8(C) 22(D) 18 |
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Answer» Answer: Hi friend Hope this answer helps you The answer is 8 Explanation: According to question, uncertainty in POSITION is equal to De broglie wavelength, therefore dx= mv h
Now, according to uncertainity principle, dx.dp= 4π h
as MINIMUM is required. So, mdv.dx= 4π h
. By putting the value of dx from above, we GET v dv
= 4π 1
. So % error = v dv
×100= 4π 100
=8 |
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| 30. |
If an element z passes 2 electron in M shell then what isthe atomic no. of it? What kind of iron it will form? |
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Answer» magnesium positive ION |
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| 31. |
The oxidation state of 'K' and 'O' in KO2, respectively are(A) 0.0(B) -1,-1(C) 0.- 1/2(D)+1 ,-1/2 |
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Answer» OXIDATION state of K and O respectively +1,-1/2 orrect OPINION is (D) |
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| 32. |
Is called diamagnetism and the substancebe diamagnetic)(11 10 11 12Fig. 1.47 : Paired electronsFor example : Zn, Cd, H2O, NaCl, etc.Q. 101. Explain paramagnetism. (2 marks) OR*What aare paramagnetic substances? Giveexamples.(2 marks)Ans.(1) The magnetic properties of a substance arise due tothe presence of electrons.the nucleus |
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| 33. |
Draw a neat labelled diagram of distillation / fractional distillation to illustrate the separation of two miscible liquids.PLEASE HELP FAST................... |
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Answer» Answer: . alcohol and water are MISCIBLE liquids but both are having different BOILING POINTS i.e. 78°C & 100°C respectively. So for their SEPARATION fractional distillation has to be carried out. The mixture of alcohol and water is heated in a distillation tank fitted with a fractionating COLUMN. |
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| 34. |
How much marble of 96.5% purity would be required to prepare 100 litres of carbon dioxide at STP when marble is acted upon by dil HCL?Answer fast please.. |
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Answer» Explanation: 22.4 L of C02 at N.T.P. is OBTAINED from CaC03 = 100g 100 L of C02 at N.T.P. will be obtained from CaC03 100 = —x 100 = 446.4 g 22.4 446.4 x 100 mpure marble REQUIRED = 462.6 g• 96.5 0 63.Jul 4, 2019 |
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| 35. |
'The presence of non-volatile impurity lowers the freezing point of a liquid.'Explain the statement |
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Answer» Explanation. The freezing point is the temperature at which the liquid solvent and solid solvent are at equilibrium, so that their vapour pressures are equal. When a non-volatile SOLUTE is added to a volatile liquid solvent, the solution vapour pressure will be lower than that of the PURE solvent. |
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| 36. |
Which one of the following alkali metal ion posses maximum degree of hydration(A) Lit(B) Na+(C) K+(D) Os+ |
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Answer» hi LIT I guess a option |
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| 37. |
On dissolving moderate amount of sodium metal in liquid NH, at low temperature, which one of the following does not occur(A) Blue coloured solution is due to ammoniated electrons(B) Liq NHbecomes good conductor of electricity(C) Liq NH2 solution is paramagnetic(D) Liq NH3 solution is diamagneticOA |
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Answer» Explanation: On dissolving moderate amount of SODIUM metal in liquid NH, at low temperature, which ONE of the following does not occur:- answer :- option (d) .............(d) Liq NH3 solution is diamagnetic. HOPE it will help you ....... plz MARK me as brainliest yrrrr. |
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| 38. |
B2. Which compound form linear polymer duA. H20B. NH3C. HBOD. HCI+ Answer - Click Here: |
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Answer» Answer: NH3 Explanation: NH3 FORMS LINEAR polymer due to HYDROGEN bonding..... Plz MARK me as BRAINLIEST |
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| 39. |
A metal x forms coloured ions, is paramagneticand is used as a catalyst. Predict the block to which the metal belongs. |
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Answer» TRANSITION metals mark me as BRAINLIEST............. |
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| 40. |
1) which is limiting agentHow much product which is excessHow much N2+ 3H₂ - 2 NH31 ( 200gN2 200H2) |
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Answer» I don't UNDERSTAND your QUESTION |
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| 41. |
Which of the following order is not correct as per the property indicated against it(A) Li |
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| 42. |
The de Broglie wavelength of an electronin an orbit representedby the orbital diagram is(A) 10A |
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Answer» de Broglie WAVELENGTH SAY l l = h/mv and mvr=nh/2π so l = 2πr/n r value can be FOUND be 0.529×n² A° formula now you can SUBSTITUTE and find out the answer |
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| 43. |
In aqueous medium, among alkali metals the most and least reducing agents are respectively(A) Cs and Li(B) Li and Na(C) Li and Cs(D) Na and Li |
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Answer» Answer: A OPTION is correct |
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| 44. |
Lithium halides are covalent. This is because of(A) High hydration enthalpy of Li ion(B) High polarisation capability of Li ion(C) Large size of Li+ ion when compared to other elements in the same(D) All of these |
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Answer» will HELP you |
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| 45. |
4. Select the odd one with reasons.a. Fe, Cu, Al, Zn, Mgb. AgNO3, Cu(NO3)2, KNO3, Pb(NO3)2, Zn(NO3)2c. C, CO, CO2, CO3d. MnO4, PO4, SO4, Cr04e. Neutron, Argon, Krypton, Helium.Give the answer |
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Answer» e is odd |
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| 46. |
A) A sample of nitrogen gas occupies a volume of320cm at S.T.P calculate its volume at 66'c and 0.825 barpressure. |
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Answer» SORRY to say that i don't know this answers soo sorry Don't KEEP in MIND and make me brainlist PLEASE please
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| 47. |
Lithium halides are covalent. This is because of(A) High hydrationenthalpy of Li ion(B) High polarisationcapability of Li ion(D) All of these(C) Large size of Li+ ionwhen compared toother elements in thesame group |
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Answer» Answer: Lithium halides are covalent in nature,because Li + ion due to its SMALLER size than other ALKALI metalcations exerts STRONGER polarizing POWER towards an ion and therefore develops covalent character in the molecule (Fajan's rule). Both Assertion and Reason are CORRECT and Reason is the correct explanation for Assertion |
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| 48. |
Lithium does not react with proton donors like(A) C,H,OH(B) NH3(9)(C) 1- Butyne(D) All of theseAB |
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Answer» LITHIUM does not REACT with proton donors like Answer is (B) NH3(9) |
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| 49. |
Predict the shapes of the following molecule using theVSEPR model.a) NH3 b) CIF: c) XeF2 d) BrFs e) XeF4 |
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Answer» Answer: PREDICT the shapes of the following molecule using the VSEPR model. a) NH3 B) CIF: C) XEF2 d) BrFs e) XEF4 . 1. 3 votes |
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| 50. |
6.What is the permissible noise limit of 120 db?a) 30 minutesb) 2 minutesc) 1 minuted) 30 seconds7.Greenhouses gases causing a rise of 3℃ rise in the overall global temperature in the past century are CFCs. The CFC used in refrigerators isa) Ammoniab) Freonc) Methaned) Carbon dioxide8.In which layer of atmosphere ozone is very vital for all vegetation?a) Upper atmosphereb) Below atmospherec) Ground leveld) Below ground level9.Ozone can be destroyed by the following free radical(s)a) Chlorine radical (Cl)b) Hydroxyl radicals (OH)c) Nitric oxide radical (NO)d) all of these10.Which of the following is the oldest and the most common method used to dump the solid wastes?a) Riverb) Oceanc) Landfilld) None of the above11.Why is recycled paper banned for use in food containers?a) Because it creates a lot of spacesb) Because it creates contaminationc) Because paper can be used only one timed) Because paper is very thick and can’t cover the food containers12.What is called for a temporary hearing loss?a) Temporary ear painb) Temporary hearing problemc) Temporary threshold shiftd) Temporary hearing shift13.Which of the following sound is pleasant to our ears?a) Heavy machineryb) Transportation equipmentc) Loud noised) Music14.What is the dB of a threshold of hearing?a) 0b) 10c) 50d) 100 |
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Answer» Answer: Match the FOLLOWING ELEMENTS of COLUMN I with their prop Column 1 Column II 1. Chlorine (a) Solid halogen 2. Fluorine (b) Radioactive 3. BROMINE (c) Reddish brown liquid 4. Iodine (d) HIGHEST electron affinity 5. Astatine (e) Most electronegative Complete the following equations : Na |
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