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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. |
1)Define the following in terms of oxygena)Reductionb)oxidation |
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Answer» REDUCTION is the PROCESS in which OXYGEN is removed. Oxidation is the process in which addition of oxygen takes PLACE. |
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| 2. |
How many atoms and moles are in 79g of potassium? |
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Answer» No. of grams of Potassium in 1 mole = 39 g Mass GIVEN = 79 g No. of MOLES = 79/39 = 2.025 No. of atoms in 1 mole of Potassium = 6.022*10²³ No. of atoms in 2.025 moles of Potassium = (6.022*2.025) * 10²³ = 12.194*10²³ |
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| 3. |
Given: H2SO4(aq)+2NaHCO3(s)—>Na2So4(aq) + 2Co2(g) + 2H20(I)If 35.00 mL of 6.0 M H2SO4 is spilled, what minimum mass (in grams) of NaHCO3 is required to neutralize this acid? |
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| 4. |
How acid rain effect iron and marble. |
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Answer» Answer: The Sulphuric and NITRIC acids in rain water tend to react with MARBLE . And as a result the calcite in marble dissolves which causes the roughning of SURFACES of BUILDINGS and removal of their surfaces. |
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| 5. |
Under which conditions will you expect the formation of compound with noble gases ??? |
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Answer» In normal conditions (Temperature: 20°C, Pressure: 1 Atmosphere), Noble Gases (He, Ne, Ar, Kr, Xe, Rn, Og) do not REACT because they have 8 electrons in their valence / outermost shell. That means, they follow octet rule. But, if we rarefy the noble gases (i.e., keep them in low temperature and high pressure), we force them to UNDERGO chemical reactions. First noble GAS COMPOUND was formed by Neil Bartlett, which was Xenon Hexafluoroplatinate (XePtF6), formed as a product of Chemical Reaction between Xenon and Platinum Hexafluoride. Chemical Equation:- Xe (g) + PtF6 (s) → XePtF6 (s) |
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| 6. |
(C) moleccelare solid D metallic soledAnis covalent solida which of the following is an example oftriclinic crystal system.(A boric acid(6 rchombic sulphere(c) Nace() Zns |
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| 7. |
At STP 28g of nitrogen gas(molar mass28) occupies a volume of ? |
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| 8. |
What is the climatic conditions required for the growth of the cotton plant ? |
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Answer» COTTON requires uniformly high temperature between 21 degree Celsius and 30 degree Celsius. ... Cotton plant needs SUFFICIENT rainfall in the EARLY stages of growth, but a sunny and dry weather is required after flowering. |
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| 9. |
LITE YUUN Via IIVILE WIR(b) 20mL of standard hard water(containing 15 g CaCO3 per litre)required 25 mL of EDTA solution for endpoint. 100 mL of water sample required18 mL of EDTA solution, while samewater after boiling required 12 mL EDTAsolution. Calculate carbonate and non-carbonate hardness of the watersample3Solve this question.2:51 PM1 |
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Answer» Sorry Explanation: O don't KNOW the answer |
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| 10. |
4) Ferrous Sulphate is used asa) haematinicsb) bufferc) emeticsd)antacid |
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Answer» HAEMATINICS is the CORRECT answer. Explanation: |
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| 11. |
What are the electrode products when in the extraction of aluminium? |
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Answer» The DIAGRAM shows an aluminium oxide electrolysis cell. The negative electrodes (CATHODES ) and the positive electrodes (anodes ) are made of GRAPHITE, a form of carbon. During electrolysis: positively charged aluminium ions gain electrons from the cathode, and form MOLTEN aluminium. |
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| 12. |
Which ion leads to diabetes |
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Answer» Answer: KATP Channel Defects (ABCC8 and KCNJ11 Mutations) and NDM Mutations in the genes ABCC8 and KCNJ11 are the most frequent cause of NDM in the Western world. Interestingly, adult-onset diabetes due to potassium channel mutations can also develop or PNDM can present later in adolescence or during pregnancy Recent research has shown that diabetes can be CAUSED by exposure to PERSISTENT organic pollutants (POPs), exudates from common plastics, air pollution, primary and secondary tobacco smoke, and some pharmaceuticals. Hope's its helps you :) |
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| 13. |
During the elecrolysis of molten aluminium oxide ore the oxide ions move? |
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Answer» During ELECTROLYSIS: positively charged aluminium ions gain ELECTRONS from the CATHODE, and form molten aluminium. oxide ions LOSE electrons at the anode, and form oxygen molecules. |
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| 14. |
नंबर ऑफ रिंग प्रेजेंट इन द स्ट्रक्चर ऑफ जाइलोमेटाजोलाइन |
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| 15. |
Why do we apply paint on iron are flushed with nitrogen. Why? |
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| 16. |
Write note an multicenter bonding in electron deficient molecules |
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Answer» Answer: the BONDING in boranes involves multicentre bonding, in which THREE or more atoms share a pair of bonding electrons, boranes are commonly CALLED electron-deficient substances. Diborane has the following structure: Explanation: MAY it will help you |
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| 17. |
Higher fixed carbon content in a coal sample indicates that the coal __________. |
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Answer» The fixed-carbon content of a coal is determined by subtracting the percentages of moisture, volatile MATTER, and ash from a SAMPLE. SINCE gas-solid combustion reactions are slower than gas-gas reactions, a high fixed-carbon content INDICATES that the coal will REQUIRE a long combustion time. |
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| 18. |
State all the charateristics of homologous series |
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Answer» Four characteristics of a homologous SERIES are: (i) The general formula of all compounds in the series is the same. (ii) They have the same FUNCTIONAL GROUP. (iii) Their physical properties such as melting point, BOILING point, density, generally show a gradual CHANGE with increase of molecular formula in the series. |
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| 19. |
What is brine. write its formula |
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Answer» Answer: A concentrated solution of SODIUM chloride in WATER. Concentration of salt MAY range from 5 to 26%. NaCl + H2O is the CHEMICAL formula of brine Explanation: |
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| 20. |
the people who live in around and the forest are said to be stakeholders how the forest why explain |
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Answer» Answer: The people who live AROUND FORESTS are known as stake holders. Because any developmental activities regarding FOREST areas can DIRECTLY or indirectly affect them. |
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| 21. |
(a) When Magnesium burns in air, it combines with Oxygen to form Magnesium Oxide. Calculate the mass in grams of Magnesium Oxide is produced from2.00 mol of Magnesium |
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Answer»
SOURCE: Royal Society of Chemistry A graph SHOWING the MASS of the magnesium and the mass of oxygen which has combined with it. The x axis is the mass of magnesium in GRAMS and the y axis is the mass of oxygen in grams. The line REPRESENTING the formula MgO, a 1:1 ratio. |
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| 22. |
In short question example of concept of mole? |
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Answer» For example, a mole of water contains NA number of H2O molecules. However, each water MOLECULE contains 2 HYDROGEN atoms and one oxygen atom. Therefore, one mole of H2O contains 2 moles of hydrogen and one mole of oxygen. |
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| 23. |
Physical states of reacants and products in copper sulphate + potassium iodide |
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Answer» Explanation: This is not a simple reaction but a mixture of processes taking place in the same reaction vessel. If this is a test tube style reaction or it is happening in a beaker where chemicals are simply mixed together, then the quantities will not be exact. LEFT over reagents can account for residual colours. Yellow / brown - Iodine Blue - hydrated Cu^(2+) Green - Both of the above (blue + yellow = green) First: The reduction of Cu^(2+) to Cu^(+) Cu^(2+) + 2 I^(-) → 2Cu^(+) + I2 = REDOX reaction …Reduction of Cu^(2+) to Cu^(+). …Oxidation of iodide to iodine. Secondly: pptn of CuI Cu^(+) + I^(-) → CuI (white ppt) NB the ppt actually appears a yucky brown sludge because of the iodine. Iodine is sparingly (if at all) soluble in water but it does dissole in the PRESENCE of I^(-) IONS to form a dark yellow / brown solution due to the formation of the complex ion. There is almost certainly some KI left to achieve this… Thirdly: the dissolving of iodine: I2 + I^(-) → I3^(-) in solution. Effectively this behaves as iodine solution and this is how iodine is dissolved for titration purposes. Fourth: (Extension) If thiosulfate solution is used, then the Iodine is re-reduced back to Iodide and the yucky brown discolouration disappears leaving the white ppt of CuI I2 + 2 S2O3^(2-) → 2 I^(-) + S2O6^(2-) …Reduction of iodine to iodide …Oxidation of sulfate (VI) / thiosulfate to persulfate All of the processes 1, 2 and 3 are taking place simultaneously. The thiosulfate is just an added part to help illustrate the chemistry and, if NECESSARY, help to obtain a clean sample of CuI |
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| 24. |
Write a short note on covalent bond |
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Answer» Explanation: A covalent bond is a chemical bond that involves the SHARING of electron pairs between ATOMS. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of ATTRACTIVE and REPULSIVE forces between atoms, when they SHARE electrons, is known as covalent bonding. |
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| 25. |
Why solid have definitely shaped and volume |
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Answer» Solids have definite SHAPE and definite volume because the molecules in solid are closely PACKED and in fixed positions. The molecules can VIBRATE but do not move AROUND which keeps the shape and volume definite. |
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| 26. |
Is creaming the same as crackingwhat is floculationanother name for creaming, cracking and floculationwhat is multiple emulsionwhat is a stable emulsion |
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Answer» Answer: Multiple EMULSIONS are COMPLEX polydispersed systems where both oil in water and water in oil emulsion EXISTS simultaneously which are stabilized by lipophillic and hydrophilic surfactants respectively. The ratio of these surfactants is important in achieving stable multiple emulsions. Explanation: Emulsion stability can be defined as the system's ABILITY to resist CHANGES in its physicochemical properties over time. ... Several mechanisms such as creaming, flocculation and coalescence cause emulsion breakdown. |
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| 27. |
12.of the light radiation from Neon atom has wavelength 500 nm, the energy of thephoton being emitted is4) 3.156x10-9]1) 3.313x10-19 J 2) 3.975x10-19 3) 3.365x10-19 JTime period of wave is 5x10-3s, what is the frequency?13.4) 5x10's-4) 6x1095s1) 5x10-35-12) 2x102^S-13) 23x10'^s-1The wave number is 2x10 cm, its frequency would be:1) 10^-5 S^-12) 2x10-5s-13) 2x10-'S-1Calculate the wavelength of an ultraviolet wave , if its frequency is cycle persecond and C=3x108 ms1) 2.5x10^-9m 2) 25x10^-9m 3) 50x10m4) 2.5x10^-7mThe frequency of the radiation having wave number 10 m is.1) 10s^-12) 3x10-45-1 3) 3x10's^-14) 3x10's^-1 |
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Answer» ggryyyre¥wishing I LOVE you all I can do it all over it |
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| 28. |
8. Which king defeated Pulakesin II ? |
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Answer» good AFTERNOON have a GREAT day with lots of fun and happiness and SUCCESS in your life and be HAPPY |
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| 29. |
State Hess’s Law with a suitable example |
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Answer» Explanation: The law states that the change in enthalpy for a REACTION is the same whether the reaction takes place in one or a SERIES of steps. The Hess's law can also be stated as the enthalpy change for a CHEMICAL reaction is the same REGARDLESS of the PATH by which the reaction occurs. |
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| 30. |
Write the formulas of four strong acids and four weak acids. |
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Answer» Answer: strong acid 1 HCL 2 h2so4 3 HNO3 4 HL WEAK ACID 1 HCOOH 2 CH3OOH 3 C2H2O4 4 C6H5COOH |
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| 31. |
Oxides and hydroxide of alkaline earth metals except beryllium are______ in nature.a.acidicb.basicc.amphotericd.neutral |
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Answer» Explanation: |
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| 32. |
Discuss types of equilibrium with suitable examples |
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Answer» Answer: Translational motion – A book resting on a table. ROTATIONAL equilibrium – A body moves in a CIRCULAR path with constant velocity. Static equilibrium – A wall-HANGING, hanging on the wall. Dynamic equilibrium – A ball decends down in a fluid with its terminal velocity. STABLE equilibrium – A table on the floor A pencil UNSTABLE equilibrium – standing on its tip. Neutral equilibrium – A dice rolling on a game board |
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| 33. |
Given equation for the neutralisation reaction for the formation of the following salts1]sodium nitrate2]magnesium chloride3]calcium sulphate |
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Answer» ok Explanation: Nano3 mgcl2 |
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| 34. |
3] Calculate the constant external pressure required to compress one mole of anideal gas troon a volume of 20 L to 8L when work obtained is 44.9 |
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Answer» Answer: Explanation: 70% of 200 ml is 140 ml, so you WOULD NEED 140ml of pure ethanol. But you have 95% ethanol, so you would need a little more of that concentrated solution to MAKE the DILUTE solution. |
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| 35. |
Write four homologues of methyl alcohol (CH3 - OH) |
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Answer» THUS, the FIRST member of the alcohol homologous series is methyl alcohol, the second is ethyl alcohol, the third member is PROPYL alcohol and the FOURTH member is butyl alcohol. ... The IUPAC name for methyl alcohol CH3−OH is methanol. The IUPAC name for ethyl alcohol CH3−CH2−OH is ETHANOL. |
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| 36. |
Everything about chlorination? |
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Answer» Answer: Chlorine has a variety of uses. It is used to disinfect WATER and is part of the SANITATION process for sewage and industrial waste. During the production of paper and cloth, chlorine is used as a bleaching AGENT. It is ALSO used in cleaning products, including household bleach which is chlorine dissolved in water. |
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| 37. |
Write the expression for the equilibrium constant, Kcfor each of the following reactions,C(s) + CO2(g)2C0+(g(FeO(s) + CO(g) Fe(s) + Co2(g) |
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Answer» દૂધમાં ભેળવેલું પાણીએ સમાંગ મિશ્રણ છે ખરું કે ખોટું |
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| 38. |
Q 1.Q No 10) The process of formation of solid back up ondissolving of solute is due to1. Recrystalizaton 2. supersaturation 3. collusion4. Allof the above |
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Answer» Answer: Dissolution is the dissolving process of the solid SOLUTE. ... EXAMPLE 1: Above is illustrated an example of a saturated solution ... SUPERSATURATED solution.bmp ... Back to top. |
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| 39. |
A solid mixture contains MgCl2 and NaCl. When 0.5000 g of this mixture is dissolved in enough water to form 1.000 L of solution, the osmotic pressure at 25.0 °C is observed to be 0.3990 atm. What is the mass percent of MgCl2 in the solid? (Assume ideal behavior for the solution.) |
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Answer» distributorship AKHILESH hucksterism |
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| 40. |
On the basis of electronic configuration of an element X with atomicnumber 9, identify the group and period of the element X. |
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Answer» atomic NUMBER 9 is fluorine. group is 17 and period is 2 |
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| 41. |
11 )Which of the followingelectrons have highest energy?*O 28O 2pO1sОзр7m |
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Answer» Answer: 4p |
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| 42. |
How will convert ethyl bromide into ethane |
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Answer» Treat the ethyl bromide with aqueous KOH. Which will from ethanol as a PRODUCT and KBr as a SIDE product. Step 2: Reduction of HYDROXYL group(-OH) with the help lithium aluminum hydride will give us ethane as desired product. |
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| 43. |
fill in the blanks with the correct words: 1. the metal present at the top of the activity series is _________. (gold/potassium) |
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Answer» Here is your answer... |
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| 44. |
Ozone absorb infrared rays |
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Answer» Explanation: ATMOSPHERIC ozone has two effects on the temperature balance of the EARTH. It absorbs solar ultraviolet RADIATION, which heats the stratosphere. It also absorbs infrared radiation EMITTED by the Earth's SURFACE, effectively trapping heat in the troposphere. |
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| 45. |
25g of Heptane and 35g octane are mixed with each other it's vapour pressure for pure State in 450gand730mmhg.find vapour pressure of mixing |
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Answer» I didn't UNDERSTAND this QUESTION so I can't answer this question |
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| 46. |
state whether the following statements are true or false: 1. nitrogen is used for making integrated chips in computer devices _________ |
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Answer» False Explanation: NITROGEN is used for INCREASING SHELFLIFE of chips |
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| 47. |
The work done to move a charge of 3 C across two points having a potential difference 12 V is ----- Joule |
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Answer» answer 1wrby2ertycufufkfgisyrldhsutsyrq7t159udihdaor6sultlsw7tr6os7ot |
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| 49. |
state whether the following statements are true or false: 1. graphite is used as a dry lubricant. _________ |
Answer» TRUE |
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