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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 2951. |
what happens when acid rain falls on a marble monument?write a balanced equation for it. |
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Answer» thnx |
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| 2952. |
When potassium nitrate is heated, it decomposes into potassium nitrite and oxygen.Write balanced equation for this reaction and add state symbols of the reactants andproducts.3. |
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Answer» The chemical reaction is a decomposition reaction . The balanced reaction is -------- 2KNO3 ------> 2KNO2 & O2 |
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| 2953. |
Air contain 20 % O2 by volume. How many cc. of air will berequired for oxidation of 100 cc of acelylene?(1) 1064 cc(3) 500 cc(2) 212.8 cc(4) 1250 cc |
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| 2954. |
Why is nylon considered to be a goodmaterial for making fishing nets? |
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Answer» Because nylon is: exeptionally strongeasy to washresistant to damage from oil and many chemicalslow in moisture absorbinglong lastinglight weighted because it was not able to absorb water Nylonisconsidered to be a good material for making fishing netsbecause;Nyloncan absorb water and will not get weakened by being submerged in water for a longer duration. Thenylonproperties are such that it can withstand any change, whether it is dry or wet. In a displacement reaction, a more reactive element replaces a less reactive element from a compound. ...In a displacement reaction, onedisplacementtakes place. A + BX → AX + B.In a double displacement reaction, two displacements take place to complete thereaction. Nylonis a strong and lightweight material. It is able to withstand watery conditions i.e. its strength does not get depleted even if submerged in water. ... Hence it isused for making fishing nets. |
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| 2955. |
who invented new periodic table |
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Answer» The periodic law, as we know today owes its development to the Russian chemistDmerit Mendeleevand the German chemistLothar Meyer . dmitri mendeleev is the person who invented the new periodical table dmitri mendeleev has invented new periodic table |
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| 2956. |
Who invented periodic table? |
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Answer» Dmitri Mendeleev |
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| 2957. |
lon with highest ionlzation energy is(2) B (g)び.c (9) |
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Answer» the answer is D. as o- has a configuration of Fluorine I think it is C- |
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| 2958. |
Q.18) Which of the following has greater number of atoms 100 gm of N2 or 100 gm of NH2. |
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Answer» No. of moles of atoms = weight / atomic weight. 100 gms of N₂ = 100/2 x 14 moles = 100/28 moles Number of molecules = 100 / 28 x 6.022 x 10²³ Molar mass of N₂ = 2 x molar mass of monoatomic N Molar mass of N₂ = 2 x 14.0067 = 28 moles. Number of molecules = 100/28 x 6.022 x 10²³ No. of atoms = 2 x 100/28 x 6.022 x 10²³ = 43.01 x 10²³ For NH₃ :- 100 gm of NH₃ = 100/17 moles Number of molecules = 100/17 x 6.022 x 10²³ molecules No. of atoms in NH₃ = (1 + 3) = 4 x 100/17 x 6.022 x 10²³ =141.69 x 10²³ atoms. Therefore, NH₃ has more atoms than N₂. |
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| 2959. |
Q.18)Which of the following has greater number of atoms 100 gm of N2 or 100 gm of NH3 |
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| 2960. |
uo15. Which of the following is never true for cathode rays?A) They possess kinetic energyC) They produce heatB) They are electromagentic wavesD) They produce mechanical pressure |
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Answer» Cathode rays do not produce mechanical pressure, so the answer is the last option. |
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| 2961. |
A beaker of circular cross section radius 4 cm is flled with Hg upto height 10 cm. Findby the mercury on the bottom of the beakerater f the |
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| 2962. |
What is the molecular weight (mass) for Ba(NO3)2 |
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Answer» 261. |
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| 2963. |
-Ater zendingof his money, a man is left with 265. How much money he had in hispocket |
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Answer» let the total money be Xhencex-3/4x=651/4x=65X=65*4=260rupees |
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| 2964. |
Solid NH4l dissociates according to the reaction at 400 KNHal(s) NH3(g) + HI(g) ; K,-16 atm. In presence of catalyst, HI dissociatesinto H2 and l2 as 2HIH2 12. If partial pressure of H2 at this temp is 1 atm inthe container when both the equilibrium exist simultaneously, calculate K, value ofsecond equilibrium (for the dissociation of HI). |
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Answer» nxjkxofnrbxbzmzbdjxlx fnjf how p(p-2)=16? |
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| 2965. |
K( equilibrium constant) for the synthesis of Hi (g) is 50. The degree of dissociation of Hl is(A)0.10(B)0.14(C)0.18(D)0.28 |
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Answer» Equation for synthesis is : H₂ + I₂ ⇄ 2HI Ler K₁ be for synthesis which is 50 Equation for dissociation : 2HI ⇄ H₂ + I₂ Let K₂ be for dissociation. K₂ = 1/K₁ This equals : 1 / 50 = 0.02 read properly what is asked in question and match with option given |
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| 2966. |
K (equilibrium constant) for the synthesis of HI (g) is 50. The degree of dissociation of Hl is(B) 0.14(A) 0.10(C) 0.18(D)0.28 |
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Answer» Equation for synthesis is : H₂ + I₂ ⇄ 2HI Ler K₁ be for synthesis which is 50 Equation for dissociation : 2HI ⇄ H₂ + I₂ Let K₂ be for dissociation. K₂ = 1/K₁ This equals : 1 / 50 = 0.02 |
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| 2967. |
What is the IUPAC name for the following compound?СНз-CH2-C-CH2-CH2-CH3a. 3-methylenehexaneb. 4-ethyl-4-pentenec. 2-propyl-1-butened. 2-ethyl-1-pentenee. 3-hepten |
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Answer» d.2-ethyl-1-pentene |
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| 2968. |
A radioctive nuclide decays at such a rate that after96 min, only 1/8th of the original amount remains.The value of half-life of the nuclide is:(1996) |
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| 2969. |
19. The temperature of a gas placed in an open container israised from 27°C to 227°C·The p rcent ofthe original amountof the gas expelled from the container will be(a) 20(b) 40(c) 60(d) 80 |
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Answer» tnx .... let's rock on |
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| 2970. |
2. What are the general molecular formulae of alkanes, alkenes and alkynes (AS,) |
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Answer» General formula for Alkane is CnH(2n+2) ; n is integer, n= 1, 2, 3…. For alkene it is CnH(2n) ; n = 2, 3, 4… For alkyne it is CnH(2n-2) ; n = 2,3,4… Since, alkene and alkynes refers to double bonded carbons & tripple bonded carbons respectively, there must be at least2 carbon atoms. |
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| 2971. |
Draw the structure and write downe IUPAC name for the isomerismhibited by the molecular formulae:(i) CHIo Pentene (3 isomers)(i) C,51DH. Hexene (5 isomers) |
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| 2972. |
Draw the structural formulae of all the possible isomers of the compound with themolecular formula C3H,O and also give their electron dot structures. |
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Answer» dot structure kase banega |
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| 2973. |
9) Draw the structure and write downthe IUPAC name for the isomerismexhibited by the molecular formulae:(i) CH Pentene (3 isomers)(ii) CH4- Hexene (5 isomers)5 12 |
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| 2974. |
1. Complete the following reactionCH3COOH + NaHCO, |
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Answer» NaHCO3 + CH3COOH → CH3COONa + H2O + CO2 Sodium bicarbonate react with acetic acid to produce sodium acetate, water and carbon dioxide. |
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| 2975. |
6. Balance the following chemical equations.(a) HNO, + Ca(OH), → Ca(NO3), + H,O(b) NaOH + H, SO → Na, SO, +,0(c) NaCl + AgNO, → AgCl + NaNO,(d) BaCl, + H,SO, → Baso, + HCI |
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| 2976. |
Q20Calculate the Force required to move a stationary object of mass 3kg from rest to velocity5)at 8 m/s in 2 seconds. |
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| 2977. |
Problem í¨3-Boron is unable to form BF ion. Explain. |
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Answer» Boron does not have d orbitals. Because of this, it is not possible for the element to expand on its octet. This, in turn, causes the maximum covalence of boron to be restricted to 4. Beyond this value, boron will become unstable and not be able to form BF6 3- ions. |
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| 2978. |
9 What is CH3COOH? |
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Answer» Acetic acid, systematically named ethanoic acid, is a colourless liquid organic compound with the chemical formula CH₃COOH. it is the chemical formula of acetic acis if you like plz like acetic acid or etanoic acid is correct answee it's acetic acid an weak acid it's break down in CH3COO- and H+ |
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| 2979. |
How many chambers are present in the heart of a: FrogCrocodile |
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Answer» The frog heart has3 chambers: two atria and a single ventricle. The atrium receives deoxygenated blood from the blood vessels (veins) that drain the various organs of the body. The left atrium receives oxygenated blood from the lungs and skin (which also serves as a gas exchange organ in most amphibians). Crocodiles do havefour chambersin their heart yes as well as two ventricles which is very unusual in reptiles. |
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| 2980. |
what is the chemical name of vitamin c |
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Answer» ascorbic acid is the correct answer of the given question ascorbic acid is the correct answer The vitiman the proteins chemical chemical name of vitamin c is Ascorbic acid Chemical name of vitamin C is ascorbic acid. ascorbic acid is the correct answer chemical name of vitamin C is Ascorbic acid. (5R)-[(1S)-1,2-Dihydroxyethyl]-3,4-dihydroxyfuran-2(5H)-one Formula:C6H8O6 ascorbic acid is the right answer |
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| 2981. |
What is the chemical name for HCH3 CO2? |
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Answer» The chemical name for HCH3 CO2 is acetic acid. |
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| 2982. |
NaCl ka chemical name |
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Answer» Chemical name of NaCl is Sodium Chloride. sodium chloride hai NaCl |
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| 2983. |
13. Identify the compound X on the basis of the reactions given below. Also, write the name andchemical formulae of A, B and C.A) + (H2(9)Compound+ HC+ CH3COOHINCERT Exemnlar |
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| 2984. |
What are the chemical name of(a) Bleaching powder(b) Baking soda |
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Answer» a)Calcium hypochloriteb)Sodium bicarbonate or sodium hydrogen carbonate |
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| 2985. |
eCHEMISTRY:Write the common name, its chemical formula and any five properties of following compounds:(1) Alum (b) Blue Vitrol (3) Baking Soda (4) Washing Soda (5) Bleaching PowderOLOV |
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| 2986. |
0D sthe Cetot oape&HCIclblue mu |
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Answer» The colour of litmus paper changes only in the presence of ions like hydrogen (H+) or hydronium (H3O+) ions. HCl can produce these ions only in the form of aqueous solution. Hence dry HCl gas does not change the colour of dry litmus paper. |
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| 2987. |
on_pnoihitaterming an insoluble sob d thatbMatch the Columns.Column A1) Physical changes2) Copper sulphate) Iron) Carbor) Spoilage of food) Magnesium hydroxide v) Oxygen and waterColumn B(i) Reacts with sulphur(ii) Irreversible(iii) No new substance is formed(iv) Turns red litmus blue(v) Reacts with zincColumn C(a) Rust(b) Chemical changeBasic(d) Reversible(e) Endothermic reactionZinc sulphate is formed |
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Answer» physical change -no new substance is formed-reversiblecopper sulphate-reacts with zinc- zinc sulphate is formediron-oxygen and water-rustcarbon-reacts with sulphur -endothermic reactionspoilage of food-irreversible-chemcial change |
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| 2988. |
(a) Give the appropriate chemical formulae of the ores: Malachite and Calamine. |
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| 2989. |
Write the chemical formulae of the following compound:(a) Magnesium chloride(b) Calcium hydroxide(c) Sodium sulphite |
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| 2990. |
what is the chemical formulae of rust |
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Answer» Iron when reacted with both water and oxygen which present in air (moist air), corrodes. Its silvery colour changes to a reddish-brown, because hydrated oxides are formed which is commonly called as rust. Reaction showing formation of rust when reacted with water in presence of oxygen (atmosphere). 4Fe+3O₂+XH₂O →2Fe₂O₃.XH₂O |
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| 2991. |
SECTION C"Write the chemical formulae of the following compound:(a) Magnesium chloride(b) Calcium hydroxide(c) Sodium sulphite |
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Answer» Magnesium chloride - MgClCalcium hydroxide - Ca(OH)2Sodium sulphite - Na2SO3 Please hit the like button |
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| 2992. |
The observation deck of tall skyscraper370 m above the street. Determine thetime required for a penny to free fall fromthe deck to the street below. |
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Answer» Given: vi = 0 m/s d = -370 m a = -9.8 m/s2 Find: t = ??d = vi*t + 0.5*a*t2-370 m = (0 m/s)*(t)+ 0.5*(-9.8 m/s2)*(t)2 -370 m = 0+ (-4.9 m/s2)*(t)2 (-370 m)/(-4.9 m/s2) = t2 75.5 s2 = t2 t = 8.69 s |
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| 2993. |
What is meant by the term chemical formula? |
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| 2994. |
chemical formula of limonite |
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Answer» FeO(OH) · nH2O limonite |
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| 2995. |
chemical formula of calcium |
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Answer» chemical formula of calcium is ca chemical formula of calcium is Ca nd it's atomic number is 20 Chemical formula of calcium is Ca Ca is the chemical formula of calcium |
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| 2996. |
chemical formula of detergent |
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Answer» Formula of washing soda is Na2CO3.10H2O.b |
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| 2997. |
you are provided with hard water and soft water into separate test tube. what do you observe on adding he quantity of soap solution to reach sample of water and shaking them 10 times |
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Answer» Hard water forms lather with soap. Soft water does not form lather with soap. hard water contains calcium ions and magnesium ions or both when soap solution is added to it, it forms a in soluble substance called scum. In soft water the soap solution will form foam. |
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| 2998. |
chemical formula of aluminum hydrogen carbonate |
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Answer» Aluminum Hydrogen CarbonateAl(HCO3)3 |
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| 2999. |
1. The chemical formula of lead sulphate is(a) Pb so(b) Pb(SO.):(c) PbSO.(d) Pb (SO) |
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Answer» The chemical formula of lead sulphate is(c). PbSO4 the chemical formula is c the third one is the correct answer The Correct Answer is c.PbSO4. it's answer is (c) PbSO4 c is the correct answer |
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| 3000. |
. Draw the structures of the followi(0) 2.4-dinitrophenylhydrazone of benzaldehyde(ii) Cyclopropanone oxime(ii) Acetaldehyde dimethylacetal(iv) Semicarbazone of cyclobutanone(v) Ethylene ketal of hexan-3-one(vi) Methyl hemiacetal of formaldehyde NCER |
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