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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. |
What property in the periodic table increases with an increase of ayomic numberof both alklimetals and halogens |
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Answer» ELECTRONEGATIVITY, electropositivy Explanation: |
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| 2. |
Give an example of nitrate salts which is insoluble in water |
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| 3. |
7) For making cake, baking powder is taken. If at home your mother uses soda insteadof baking powder in cake.a) How will it affect the taste of the cake and why?b) How can baking soda be converted into baking powder?c) What is the role of tartaric acid added to baking soda? |
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Answer» a) Baking soda is basic in nature and if used in cake as an ingredient INSTEAD of baking powder...it will form a bitter taste. b) To convert baking soda into baking powder we NEED a nacent oxygen from a mild acid like tartaric acid. Thus tartaric acid can be used to convert baking soda into baking powder c) The tartaric acid added to baking soda neutralises it into some extent MAKING it SUITABLE for baking and release co2 when baked. |
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| 4. |
What is that reaction and equivalent..? |
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Answer» Explanation: |
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| 5. |
28th question solve this friends please |
Answer» Answer:1. Toothpastes are generally basic in nature. Why ? → In our mouth, CERTAIN types of acids are released which can CAUSE tooth decay. For its prevention, tooth pastes are generally basic in nature so as to neutralise the acid. _________________________ 2. Soil near the industries producing sulphuric acid is acidic. Why ? → Sulphuric acid is a proton donor. Hence, it is possible that proton donor gets added to the soil. As we know that, collection of hydrogen cationic ion or proton results in the reduction of pH. Hence, soil near such proton donor acids makes it acidic. __________________________ 3. The pH value of our stomach is generally less than SEVEN. Why ? → Acidic medium in stomach is necessary for digestion of food we eat. This acidic medium is created by the secretion of concentrated hydrochloric acid. This makes an enzyme pepsin activates and also kills the bacteria which comes in our stomach ALONG with food we digest. |
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| 6. |
Calculate kinetic energy of 5moles of nitrogen at 27degree centigrade |
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Answer» we have KINETIC ENERGY =3/2nRT Temperature in kalvin=273k+27degree=300k centigrade. no.of MOLE given=5 MOLES of nitrogen. therefore,n=5 |
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| 7. |
You are having five solutions A,B,C,D and E with pHvalues as follows:A = 1.8, B = 7,0 = 8.5, D = 8 and E = 5Which solution would be most likely to liberatehydrogen with magnesium powder? |
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Answer» Answer: a Explanation: it is a acid so when it reacts with metal POWER it GIVES out HYDROGEN |
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| 8. |
Which is stronger- Ethanol(an alcohol) or Ethanoic acid(an acid) |
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Answer» ANSWER: ethenol acid |
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| 9. |
CuSO4 + NaS2O3 reaction and equivalent?? |
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Answer» no the above REACTION is not EQUIVALENT |
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| 11. |
CHAPTER-1SETSsem of dietos, the word well-definedother particular objet longs to the set of not4. SETDenton Set Aseris #well defined collection of diew which we nowy whether or objetoThe word ser is synonymous with the words collection gate,The sets are usually denoted by capital letters of English alphabetThe objects that for the set are called elements or members or points onI ls an element of a set A, then we writer and wax belongs toA, then we writeamples of SetsThe collection of vowels in English alphabet i This vt contains fivenamely a, , , ,(0) The collection of all states of India forma set*A and say "x belongs to A" W x does not be |
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| 12. |
Explain the process of sublimation by an activity and with a diagram |
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Answer» HII there here is your ANSWER SUBLIMATION is the process of change of gaseous state to solid state without going through the liquid state. We can show this from a activity : ... We can observe the change of state directly from solid to gas without CHANGING into liquid state. HOPE IT HELPED U PLZ MARK AS BRIANLIEST |
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| 13. |
What is OHM'S LAW ? |
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Answer» at constant temp ,the current flowing through the CIRCUIT is directly proportional to the potential DIFFERENCE applied ACROSS the resistor |
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| 14. |
What will happen if oxygen is added to propanone |
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Answer» you will DIE ,it BURNS ENORMOUSLY |
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| 15. |
Which is the most soluble in water ?(A) C2H5NH2(B) C6H5N2BF4^-(C) CH3NHCH3(D) CH3CH2NO2 |
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Answer» Explanation: d) nitro ethane is more SOLUBLE in water because HYDROGEN bond between oxygen and WATERS hydrogen. |
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| 16. |
which of the following is not a salt atom carbonate sodium chloride potassium nitrate calcium hydroxide |
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| 17. |
List the characteristics of a chemical reaction ? |
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Answer» Answer: it FORMS to chemical products,it can release gases,it can be EXOTHERMIC REACTION ETC |
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| 19. |
2) Write the types of reaction and explain each with example. |
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Answer» Explanation: 1. An EXAMPLE of a combination reaction is when hydrogen and chlorine react to form HYDROCHLORIC acid: The SUBSCRIPTS in the chemical reaction in this IMAGE refer to the states of matter. 2 Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound. Both metals and non-metals TAKE part in displacement reactions. Example : Reaction of iron nails with copper sulphate solution. |
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| 20. |
How can we test wheter the given as alcohol or carboxylic acid ,with the help of ester |
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| 21. |
an acidic buffer contains equal concentrations of acid inside the dissociation constant of acid is 10 ^ - 5 the pH of the buffer solution is |
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Answer»
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| 22. |
Calculate amount of O2 required ingrams for combustion of 33.6 l ofMethane |
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| 23. |
Define metallurgy.answer me.I need your answer. |
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Answer» EXTRACTION of METAL from its ORE is METALLURGY |
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| 24. |
ZnSO4 + Li2CO3 → ZnCO3 + Li2SO4 |
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Answer» Explanation: This is a double DISPLACEMENT reaction because we FOUND exchange of IONS in it |
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| 25. |
Carbon cannot reduce the oxide of na or mg |
Answer» Sodium and magnesium have higher affinity towards oxygen than that of carbon because these are HIGHLY reactive metals. Hence, carbon cannot reduce the oxides of N a Na Na or M G Mg Mg. N a Na Na or M g Mg Mg are more reactive as COMPARED to carbon.hope it helps ☺️ |
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| 26. |
An aqueous solution of which of the following substances conduct electric current.A) Ethyl alcoholB) Acetic acidC) AcetoneD) Ether |
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Answer» . |
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| 27. |
The magnitude of Orbital angular momentum of an electron is given by=√5h/π. How many orbitals of this type are possible belonging to an Orbit? |
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Answer» Answer: See below. Explanation: We are given the orbital angular MOMENTUM as, According to the Bohr's model, Where n = 1, 2, 3 or any POSITIVE integer values. Hence, the angular momentum is an integral multiple of H/2 pi. Square Root of 5 is not an integer. Hence, no orbitals will possess an angular momentum as given. |
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| 28. |
Explain why the formation of NO is favoured at high temperature |
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Answer» पढ़ने नहीं आता है एकदम बकलोल है का कुछ समझ में नहीं आता है खाली ब्रेनली से पूछता है। तुम्हारे पास खुद का दिमाग नहीं है। |
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| 29. |
Reactivity of al decreases if it is dipped in hno3 |
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Answer» Answer: it is because of the FORMATION on of aluminum OXIDE layer ..........hope it HELPS you...........pls pls..MARK as brainlist |
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| 30. |
1) Balance the following chemical equations:-a) NaNO3 + PbO → Pb(NO3)2 + Na2Ob) Agl + Fe2(CO3)3 → Fel3+ Ag2CO3c) ZnSO4 +Li2CO3 → ZnCO3 +Li2SO4 |
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Answer» a) 2NaNO3 + PBO → Pb(NO3)2 + Na2O b) 6Agl + Fe2(CO3)3 → 2Fel3+ 3Ag2CO3 |
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| 31. |
Convert benzene to n-butane |
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Answer» Answer:
Explanation:Ozonolysis of BENZENE in PRESENCE of Zn /H20 to give out Glyoxal Reduction of glyoxal to form 1,2-Ethanediol Reaction with HCL with 1,2-Ethanediol to give out 1,2dichloroEthane Reaction of 1,2dichloroEthane with 2 moles of CHLOROMETHANE in presence of Zn (Frankland Reaction) will give the FOLLOWING result
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| 32. |
Problem 9.5Calculate the strength of 10 volumesolution of hydrogen peroxide. |
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| 33. |
What is the Latent Heat? Define its two types. |
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Answer» Answer: HEY bro✌ The CHARACTERISTIC AMOUNT of energy absorbed or released by a substance during a change in its physical state that occurs without CHANGING its temperature is known as latent heat. ⭕The two types of latent heat are Latent heat of fusion and latent heat of VAPOURIZATION. |
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| 35. |
Kclo3 on heating gives kcl and O2 .What is the volume of O2 liberated by 0.1 mole of Kclo3. |
Answer» 3.36 LitresThe decomposition of KClO3 on heating is called as thermal decomposition reaction. The Chemical Equation showing this reaction: 2KClO3 ----heating---> 2KCl + 3O2 2 MOL 3 mol Calculating how much 2 MOLES of KClO3 evolve Oxygen at N.T.P = 3 x 22.4 L = 67.2 Litres Calculating how much 1 mole of KClO3 evolve Oxygen at N.T.P: For this we take 2 to the other side of the equation = 67.2 / 2 Litres = 33.6 Litres Now, Calculating how much 0.1 mole of KClO3 evolve Oxygen at N.T.P = 67.2 / 2 x 0.1 L = 3.36 Litres Therefore, the VOLUME of O2 LIBERATED by 0.1 mole of KClO3 is 3.36 Litres. |
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| 36. |
Which oxide of nitrogen may be called a mixture anhydride? why? |
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Answer» Answer: NO₂ NITROGEN Dioxide is called mixed acid Anhydride. It is because when NO₂ DISSOLVES in water, it gives out 2 KINDS of ACIDS namely Nitrous acid and NITRIC acid. |
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| 37. |
Which of the following is not an property of acid?a. Acids are sour in taste.b. Acids are used in preparing fertilizersc. Acids may be corrosive or non corrosive.d. Acids are used in sope and detergent industries. |
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Answer» Answer: hii! here is ur answer d. acids are used in sope and DETERGENTS is the wrong statement because in soaps and detergents industries uses basics and moreover SOAP can't be acid which may DAMAGE our skin help others! |
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| 38. |
Give the name and structural formulae of one homologue of HCOOH |
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Answer» ch3cooh that is because it has differennce of CH2 and the difference in molecular MASS is 14u. |
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| 39. |
Explain why N2O4 is diamagnetic.mention its shape |
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Answer» N204, is diamagnetic. The two unpaired ELECTRONS in the two NO2 units get paired while forming the DIMER, and so N204 is diamagnetic with even NUMBER of electrons. |
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| 40. |
Give some examples of s block elements. and t block elements |
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Answer» The s-block elements include HYDROGEN (H), helium (He), lithium (Li), beryllium (Be), sodium (Na), MAGNESIUM (Mg), potassium (K), calcium (CA), rubidium (Rb), strontium (Sr), cesium (Cs), barium (Ba), francium (Fr) and radium (Ra). The periodic table shows EXACTLY where these elements are within the s-block |
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| 41. |
5.The magnetic property and the shape of[Cr(NH3)6]3+complex ions are :(1) Paramagnetic, Octahedral(2) Diamagnetic, square planar(3) Paramagnetic, tetrahedral(4) None of the above |
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Answer» Answer: 3 Explanation: |
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| 42. |
The properties of acids says that acids are sour in taste but in Apple there is malic acid which is sweet .why? |
Answer» Answer:Malic acid is an organic compound with the MOLECULAR FORMULA C4H6O5. It is a dicarboxylic acid that is made by all living organisms, contributes to the sour taste of fruits, and is USED as a food additive. Malic acid has two stereoisomeric forms (L- and D-enantiomers), THOUGH only the L-isomer EXISTS naturally. The salts and esters of malic acid are known as malates. The malate anion is an intermediate in the citric acid cycle. |
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| 43. |
How many ml of solvent water should be added to convert 10 ml 63% (w/w) HNO3 having density 1.6g/cc to 21% (w/w) HNO3 with density 1.2g/cc ?(1) 40 ml(2)30 ml(3)20 ml(4)10 ml |
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Answer» Answer: 1) 40 ml |
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| 44. |
CuS04 Sol" is electrolyoed for 20 min with current of 3 A what mass of copper will be depositedat the cathode. [Eq of mass of cu= 31.75] |
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Answer» Answer: 0.3 Explanation: |
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| 45. |
5. Which have nearly same atomic masses?a) Fe, Co, Nib) Ru, Rh, Pdc) Os, Ir, Pt.d) all of these |
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Answer» a. FE, CO, ni.. |
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| 46. |
Which have neglegible enol |
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Answer» the answer is a as it BECOMES highly UNSTABLE because it becomes ANTIAROMATIC due to FORMATION of enol |
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| 48. |
Can anyone check the answer and correct it if it is wrong. |
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Answer» ANSWER:Your ANSWERS are PERFECT. EXPLANATION:Execllent MATE. |
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| 49. |
I) Which of the following will not give yellow precipitate when treated withNaOH and 12?(a) 3-Methylbutan-2-one (6) 2-methylpentan-3-one(c) Propanone(d) Hexan-2-one. |
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Answer» Explanation: because it is a methyl ketone |
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