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. |
list two observations which you make When you add A Pinch of sodium hydrogen carbonate to acetic acid in a test tubel write chemical equation for the reaction |
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Answer» ction is NAHCO3(s)+CH3COOH (l)--> CH3COONa(aq) + CO2 (g)+ H2O(g)Observations --1 Sodium hydrogencarbonate slowly dissolves in ACETIC acid.2 Bubble formation takes place due to RELEASE of carbon DIOXIDE gas. |
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| 2. |
According to the global carbon project what is the place of india as emitter of carbon dioxide in the world |
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Answer» the fourth highest emitter of carbon dioxide in the WORLD, accounting for 7 per cent of global emissions in 2017, a study by the Global Carbon Project released on December 5 says.The top four emitters in 2017, which covered 58 per cent of global emissions, were CHINA (27 per cent), the US (15 per cent), the European Union (10 per cent) and India (7 per cent), according to the projection by the Global Carbon Project.The rest of the world contributed 41 per cent last year. |
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| 3. |
During chlorination chlorine is added to water which produces nascent oxygen.Thic nascent oxygen kills all harmful germs and bacteria present in water |
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Answer» n is not clear.....what do U WANT to ASK..PLS give a proper QUESTION |
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| 4. |
Name the chain isomers of c6h14which has a tertiary hydrogen atom. |
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Answer» iary butyl alcohol, the TERTIARY carbon is bonded to zero hydrogen atoms. Rather, it is bonded to THREE carbon atoms and an oxygen ATOM. |
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| 5. |
Explain the paramagnetic nature of O2 on the basis of Mol. orbital theory |
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Answer» son that it is paramagnetic is because the oxygen MOLECULE has two UNPAIRED electrons. Electrons not only go around the atom in their orbitals, they also spin, which CREATES a magnetic field. ... Since liquid O2 does stick to a magnet, MOtheory is better at EXPLAINING the BEHAVIOR. |
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| 6. |
What are the properties of ionic bond from class 11 |
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Answer» l properties of ionic compounds: DUE to the presence of the strong force of attraction between the POSITIVE and negative ions, ionic compounds are solids and are hard to break. They generally break into pieces when PRESSURE is applied, HENCE are considered BRITTLE. |
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| 7. |
A chemical signal that has both endocrine and neural roles is |
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Answer» endAns》⤵Pituitary Gland✔✔✔Hope it HELPS. |
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| 8. |
What are the variations in group of periodic table and don't copied it from google give me perfect answer |
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Answer» ll decreases down a group -tendency to GAIN electron, electronegativity, electron affinity, ionisation energy. These all increases down a group- METALLIC & non -metallic CHARACTER, tendency to lose electron. ❤️ |
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| 9. |
BeH2 has a polymeric structure |
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Answer» .....☺☺☺☺☺☺÷====÷ |
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| 10. |
Thermal stability of sulphates of alkaline earth metals increases down the group |
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| 12. |
Deos bond angle increase or decrease with decrease in electronegtivy |
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Answer» ly s- CHARACTER increase in the HYBRID bond, the bond angle increases. Lone pair repulsion: Bond angle is affected by the presence of lone pair of electrons at the CENTRAL ATOM. ... Electronegativity: If the electronegativity of the central atomdecreases, bond angle decreases. |
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| 14. |
What was rutheford experiment based on nucleus |
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| 15. |
Notes of metals and non metals class10 please |
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| 16. |
What is meant by tritration |
| Answer» CESS of FINDING out how much of a particular SUBSTANCE is in a liquid by measuring how much of ANOTHER substance is needed to react with it | |
| 17. |
hey please describe the valency of class 11 from chemistry don't copy it from google give me perfect answer.. |
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Answer» ence or valency of an ELEMENT is a measure of its combining power with other atoms when it forms chemical compounds or molecules. The concept of valence developed in the second half of the 19th century and HELPED successfully explain the molecular structure of INORGANIC and organic compounds. The quest for the underlying causes of valence led to the modern theories of chemical bonding, including the cubical atom (1902), Lewis structures (1916), valence bond theory (1927), molecular orbitals (1928), valence SHELL electron PAIR repulsion theory (1958), and all of the advanced methods of quantum chemistry. |
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| 18. |
Radical definition in simple way for class 7 |
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| 19. |
What is suspend particles?? |
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Answer» e..Here's Ur Answer..SUSPENDED particles :- Small particles which remain in SUSPENSION in water as colloid or DUE to the motion of the water.HOLE IT HELPS U..^-^ |
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| 20. |
Explain periodicity of elements and also explain it's causes it's urgent don't copy from google please give me correct answer. |
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Answer» ements are ARRANGED in of their atomic number in the PERIODIC table, a REPETITION in PROPERTIES after a is observed.This of properties is KNOWN as periodicity of properties of elements.❤️ |
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| 21. |
Which of the following is neutral in nature? (a) CO2 (b)SO3 (c)N20 (d) P205 |
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Answer» . because ye .. p4o10 SEE BNTA H ... .. p4o10 p4 or air SE bnta ..h now I THINK that |
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| 22. |
Reaction of Ethanol with ethanoic acid in the presence of Kong H2S o4 and heated it |
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Answer» ction of ethanol and ethanoic ACID in the presence of an acid PRODUCES a sweet smelling substance called as ESTERS.CH3COOH + C2H5OH = CH3COOC2H5 + H20.these esters are then used for MAKING perfumes and other smell products.plz MARK as brainliest |
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| 23. |
Reaction of Ethanol with its night acid in the presence of conc H2 S o4 and heated it |
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| 25. |
Tell me the answer of this question : What is the function of blue glass in flame test??this is from chemistry lab and don't copied it from google |
| Answer» SORB the yellow color, and the other flame can be seen. The is used to visually DETERMINE the IDENTITY of an unknown metal of an IONIC salt based on the CHARACTERISTIC color the salt turns the flame of a ❤️ | |
| 26. |
What is Hoffman rule with 3 and 4 examples? |
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Answer» nown as HOFFMAN bromamide REDUCTION in ORGANIC . Make the QUE . clear for understanding |
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| 27. |
please answer this question and it from 11 class and the question is : What is the difference between an end point and an equivalence point?? don't copied it from google give me perfect answer |
| Answer» TWEEN EQUIVALENCE POINT and endpoint is that:-Equivalence point is the where the CHEMICAL reaction ends. End point is the point where the occurs in the system.The end of the reaction is given by the The endpoint INDICATES that the equivalence point has ❤️ | |
| 28. |
Please give me answer of this question : is pH of pure water affected by rise in temperature? don't copied it from google give me perfect answer |
| Answer» E in temperature the pH of acidic solutions as it FAVOURS the FORMATION of H+ IONS. But there is of temperature on the pH of pure water as the rate of formation of H+ ions is to OH- ions. ❤️ | |
| 29. |
Metal that does not stick to glass |
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Answer» face of glass should be oxidized in order to have a COPPER METAL BOND with it. Also, the oxidized layer should be thick enough. So we can say that copper is one metal which does not stick to glass. MERCURY IS THE METAL WHICH DOES NOT STICK TO THE GLASS |
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| 31. |
How many bond pairs and lone pairs does HCN have? |
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| 32. |
How many bond pairs and lone pairs does HCN have? How many bond pairs and lone pairs does O2 have? How many bond pairs and lone pairs does CO2 have? How many bond pairs and lone pairs does C2H4 have? How many bond pairs and lone pairs does PF3 have? Please help me!! Thank you! |
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Answer» 2 bond pair and 4 LONE pair..2 lone pair on each OXYGEN atom..and in C2H4 one double bond between both CARBON atoms and 4 single bond between carbon and HYDROGEN atom.... |
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| 33. |
How many bond pairs and lone pairs does HCN have? How many bond pairs and lone pairs does O2 have? How many bond pairs and lone pairs does C02 have? |
| Answer» 4 BOND PAIR 4 LONE pair4 bond pair 2 lone pair | |
| 34. |
How many bond pairs and lone pairs does CH4 have? How many bond pairs and lone pairs does CH3CI have? How many bond pairs and lone pairs does NH3 have? |
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Answer» here are 4 BOND PAIRS and no lone pair in CH4☆There are 4 bond pairs and no lone pair in CH3Cl☆There are 3 bond pairs and a lone pair in NH3 |
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| 38. |
How are storm's caused |
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Answer» erstorm is a storm with LIGHTNING and thunder. Its produced by a cumulonimbus cloud, usually producing gusty winds, heavy rain and sometimes hailWhat causes a THUNDERSTORM?The basic ingredients used to make a thunderstorm are moisture, unstable AIR and LIFT. You need moisture to form clouds and rain. You need unstable air that is relatively warm and can rise rapidly. Finally, you need lift. This can form from fronts, SEA breezes or mountains.hope it helps |
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| 39. |
From acetic acid, how do you get sodium acetate? |
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Answer» 1 Making a Sodium Acetate SolutionPour VINEGAR in a pan. Vinegar is a dilute SOLUTION of acetic acid. ...Add baking SODA to the pan. Baking soda is the common name for sodium bicarbonate. ...Stir the reaction. As you sprinkle the baking soda into the vinegar, you will see the solution START to bubble |
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| 40. |
The [OH-] in a solution is 1mol per litre. The pH of the solution is..... |
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| 41. |
Have u ever understand what is to be an topper of an school |
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Answer» tr....yup...of cource...becoming a topper of school was my passion from 2nd onwards...and NW in 6th and this YEAR presently...i am the class representative that is topper... if there is a way there is a will....and i had my passion or DREAM......being a topper U NEED a bit of attitude. ..thnx |
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| 42. |
Write the structural formula of aldehydes and jetones formed ethane and butane |
| Answer» FORMED from Ethane and BUTANE are ETHANAL - CH3CHO and butanal C3H7CHONo KETONE is formed from Ethane .Ketone formed from butane is butanone CH3COC2H5 | |
| 43. |
Write the steps involved in the extraction of metals in the middle of the activity series from their carbonate on being how is copper restroom the selfie or explain the various steps supported by chemical equation |
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Answer» act metals in the middle of the reactivity series,The following steps are followed,.i) If the metal is found in the form of sulphides,.. They are roasted (roasting is the process of heating[less than the melting point of metal] metals sulphides (metal sulphides) to REMOVE sulphur gas from the metal,. and the metal is converted to metal oxide as a step of purification ),. and reduced to oxide form,.EG: copper is found as copper SULPHIDE so, they are roasted to form copper oxide,.ii) If the metal is found in the form of carbonates,.. They are CALCINATED (calcination is the process of heating metal carbonates just below the melting point , in limited supply (or no supply) of OXYGEN to get metal oxide as a step of purification),.Eg: Zinc is found as Zinc carbonate,..It is calcinated to form Zinc carbonate,.iii) Then,they are reduced from metal oxide form to pure metal by, using suitable methods(it differs to each type of metal)Eg:ZnO(s)+C(s)-->Zn(s)+CO(g) |
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| 44. |
Write the colligative property which is used to find the molecular mass of macromolecules |
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Answer» pressure MEASUREMENT is preferred for molar mass determination because : (a) even in dilute solution the osmotic pressure values are APPRECIABLY high and can be MEASURED accurately. (B) osmotic pressure can be measured at room temperature. |
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| 45. |
Which of the following compounds on hydrolysis gives ethyne a)CaC2 b)Mg2C3c)Al4C3d)CuCl2the correct option is aplease explain it |
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Answer» Carbide ion in it (C2) 2-Its structure is a C atom triple bonded to ANOTHER C atom, just as if its two H atoms short of ethyne.That's why answer is a ;)Update:Complete reactionCAC2 + 2 H2O = C2H2 + CA(OH)2You can easily SEE the similarlies between Carbide ion and ethyne |
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| 46. |
Which will have highest hydration enthalpy and highest ionic radius A. Na and Li B. Li and Rb C. K and Na D. Cs and Na |
| Answer» E here's UR ANSWERB. LI and RB ✔️✔️ | |
| 47. |
Question is in pic ' |
| Answer» UESTION in PARTICULAR? | |
| 48. |
Carbon carbon double bond as compared to single bond is a)less susceptible to oxidation b)more susceptible to oxidation c)equally susceptible to oxidation |
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Answer» OOMORE SUSCEPTIBLE. SINCE THERE ARE TWO CARBONS NOW AND THEY WILL ATTRACT OXYGEN WITH MORE POWER U CAN SAY .✌️✌️ |
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| 49. |
Why surface tension vanishes at critical temperature? |
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Answer» erature decreases, surface tension increases. Conversely, as surface tension decreases strong; as MOLECULES become more ACTIVE with an INCREASE in temperature BECOMING zero at its BOILING point and vanishing at critical temperature. Adding chemicals to a liquid will change its surface tension characteristics. |
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| 50. |
Why did solubility of many substances increase in water with temperature? |
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Answer» y solids dissolved in liquid WATER, the solubility increases with temperature. The increase in kinetic energy that comes with higher temperatures allows the solvent MOLECULES to more EFFECTIVELY break apart the solute molecules that are HELD together by INTERMOLECULAR attractions. |
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