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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your Class 11 knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
1. Name the dogs use for helping 2. What is its unit 3. What do you mean by chemical stretvematery |
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| 352. |
50 kg of N2 and 10 kg of H2 are mixed to produce NH3 .Calculate the NH3 formed. |
| Answer» During the reaction, ammonia formed 56.67 kg. \xa0Explanation:A balanced reaction between nitrogen and hydrogen is as follows:From the reaction 28 g of nitrogen is reacted with 6 g of hydrogen to form 34 grams of ammonia.Therefore, 6 g of hydrogen reacts with 28 g of nitrogen to form 34 grams of .From the given,Weight of hydrogen = 1 kgTherefore, 10 kg of hydrogen reacts with 46.67 kg of nitrogen.Amount of ammonia = 10 kg + 46.67 kg = 56.67 kg | |
| 353. |
Calculate the mass of 36 ml of water? |
| Answer» Density of Water is :{tex}1 g c c ^ { - 1 } = \\frac { 1 g } { m l }{/tex}Total Mass of 36 ml water molecules ={tex}36 m l \\times \\frac { 1 g } { 1 m l } = 36 g{/tex} | |
| 354. |
What is trigonal planar? |
| Answer» Trigonal Planar\xa0Shape of Molecule:\tIn this type of molecule, we find three molecules attached to a\xa0central atom.\tThey are arranged in such a manner such that repulsion between the electrons can be minimized (toward the corners of an equilateral triangle).\tExample: BF3 | |
| 355. |
How many moles and grams of nacl present in 250cm*3of.50 moles of solution |
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| 356. |
Define formula mass |
| Answer» When a substance does not contain discrete molecules as their constituent units and have a three-dimensional structure, formula mass is used to calculate molecular mass which is sum of all the atomic masses of atom present in the formula.For example, in sodium chloride (NaCl) , sodium as chloride ions are arranged in a three-dimensional structure i.e. there are two different entities and not a single entity (like in a molecule). Therefore, the formula mass of NaCl = Mass of Na\xa0+Mass of Cl = (23 +35.5)u = 58.5 u. | |
| 357. |
What is the value of 1/4 pi E•As soon as possible |
| Answer» K stands for electrostatic consatant . K =1/4pi€0 having value 9×10^9N | |
| 358. |
Absorption spectra |
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| 359. |
What is the concentration of 1M glucose solution? |
| Answer» 22.4L stp | |
| 360. |
find the magnitude of charge present in 2.4g Mg 2+ |
| Answer» No of moles of Mg+2 ion = given weight/molar weight\xa0here,\xa0given weight\xa0= 2.4\xa0g\xa0molar weight = 24 g/mol\xa0No of moles of Mg+2 ion = 2.4/24\xa0= 0.1\xa0molwe can see that in one mole of Mg+2 ion , 0.1\xa0mole electrons occur\xa0so, in two moles of Mg+2 ions = 0.1×2 moles of electrons occur .now, no of electrons = no of mole of electrons× Avogadro\'s constant= 0.2 × 6.023 × 10²³ =\xa01.2046 × 10²³we also know,\xa0charge of one electron = 1.6× 10-19 Cso, charge by total electrons = 1.2046 × 10²³ × 1.6 × 10-19 C\xa0=\xa01.92736\xa0× 104 C | |
| 361. |
How are 0.50 moles NaCo3 and 0.50M are different |
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| 362. |
8mole of water in number of particle |
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| 363. |
Limiting reagents |
| Answer» The limiting reagent in a chemical reaction is the substance that is totally consumed when the chemical reaction is complete. | |
| 364. |
Calculate the thermometer using different temperature scales |
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| 365. |
To calculate the mass of a single atom of sodium 23 g calcium 40 g |
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| 366. |
In which of the following compounds the ionic radius of Cr is minimum?K2CrO4,CrF3,CrO2,CrCl3 |
| Answer» Bhad mein jayo<br>Pata nahii,??? | |
| 367. |
Why are Heg of Be and Mg positive? |
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| 368. |
What are the values of n,l,mand s for 19 e- in Cr? (Atomic number=24) |
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| 369. |
How many atomic orbitals are there in fourth energy level of an atom? |
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| 370. |
Define average atomic mass |
| Answer» The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope). | |
| 371. |
What is Paradox of fractional oxidation number? |
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| 372. |
Numericals on ch1 on all the concept |
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| 373. |
Question based on wavelength both theory and numerical |
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| 374. |
Relation between molarity and molality |
| Answer» Thankyou Rishab jain you answered it in one word only what a presence of mind you have??<br>Molarity is defined as number of moles divided by the volume (in liters). Molality is defined as the number of moles divided by the mass of the solution (in kg). molality = no. of moles of solute/ wt. of solvent. if density of solvent is given we can find out relation between molality and morality<br>Chemistry | |
| 375. |
Explain the line spectrum of hydrogen in 2to 3 lines |
| Answer» The emission spectrum of atomic hydrogen has been divided into a number of spectral series, with wavelengths given by the Rydberg formula. These observed spectral lines are due to the electron making transitions between two energy levels in an atom.For more information can WhatsApp on 9548279734 | |
| 376. |
What is homogeneous system in Thermodynamics? |
| Answer» Homogeneous and heterogeneous thermodynamic systemsA homogeneous thermodynamic system is defined as the one whose chemical composition and physical properties are the same in all parts of the system, or change continuously from one point to another. ... The homogeneous bodies of a heterogeneous system are referred to as phases.<br>Homogeneous system:\xa0A system is said to be homogeneous if all the constituents present are in the same phase and the composition of the system is uniform throughout. | |
| 377. |
Why there is no ideal any gases |
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| 378. |
Alcohol and phenol concepts full revision |
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| 379. |
Write down the relation between empirical formula and molecular formula. |
| Answer» Molecular Formula= n × empirical formulawhere n = Molar mass/ empirical formula mass<br>Molecular formulas tell you how many atoms of each element are in a compound, and empirical formulas tell you the simplest or most reduced ratio of elements in a compound. If a compound\'s molecular formula cannot be reduced any more, then the empirical formula is the same as the molecular formula | |
| 380. |
The term energy level is same as orbit in an atom??? |
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| 381. |
unit of zero , one, two , three order of reaction |
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| 382. |
convert 373 k into c |
| Answer» Answer is 100℃<br>ExactIs subtracting 273.15 from kelvinSo answer is 99.85 degree centigrade<br>Subtract 273 in kelvin and the answer is 373-273=100°c | |
| 383. |
What is ionic radii |
| Answer» Distance between centre of nucleus to outermost shell of an ions is called ionic radius. | |
| 384. |
Vsq for chapter 3 |
| Answer» Kya kehna cahte ho babu | |
| 385. |
How many number of atoms are present in 52u of Helium |
| Answer» 13 atoms<br>13 atoms<br>4u of helium = 1 atom1u of helium = 1/4 atom52u of helium =52×1/4 =13 atoms | |
| 386. |
What is the difference between electro magnetic waves and matter waves |
| Answer» \tS.No.Electromagnetic WavesMatter Waves1Associated with electrical and magnetic fields.Not associated with electrical and magnetic fields.2Can be emitted or radiated in space.Neither radiated into space nor emitted by the particles. These are simply associated with the particles.3Travel with the same velocity.Travel with different velocities.4Velocity is equal to that of the velocity of light i.e. 3 x 10 8 ms-1.Velocity is different from that of light.5The wavelength is given by lambda = c/v = h/mc.The wavelength is given by lambda = h/mw = h/p.\t | |
| 387. |
ideal gas equation derivation |
| Answer» pv =nrt | |
| 388. |
Number of angular nodes for 4d orbitals is? |
| Answer» twoThere are four\xa0nodes\xa0total (5-1=4) and there are two angular nodes\xa0(d\xa0orbital\xa0has a quantum\xa0number(ℓ = 2) on the xz and zy planes.\xa0<br>It will be 3 | |
| 389. |
Is threshold frequency same as minimum frequency??? |
| Answer» Threshold frequency\xa0is defined as the\xa0minimum frequency\xa0of light which causes electrons to be emitted from a metal surface | |
| 390. |
Calculate the energy associated with the first orbit of He+. What is the radius of This orbit ? |
| Answer» E=-2^2/1^2×E○ = -4E○ =-4×13.6=-54.4R=1^2/2×r○ =1/2×0.529×10^-10m=2.645×10^-11 m | |
| 391. |
calculate the mass of a photon with wavelength 3.6 angstrong |
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| 392. |
2 ton of iron ore containing 94% of fe2o3 produce iron in pure state calculate the weight of iron? |
| Answer» But it cant given that 160kg of iron oxide has 112kg of iron than by what ways you solve this question???<br>Mass of iron oxide present = 940x 2 = 1880 kg\xa0160 kg of iron oxide has 112 kg of iron\xa0hence 1880 kg will have 112/ 160 x 1880 = 1316 kg of iron\xa0hence mass of iron produced is 1316 kg\xa0 | |
| 393. |
What is the difference betwn molarity and molality ? |
| Answer» Molality (m) : It is the number of moles of the solute dissolved per kilogram (kg) of the solvent. It is denoted by m.{tex}\\therefore{/tex} Molality (m) {tex} = \\frac{{{\\text{No}}{\\text{. of Moles of solute}}}}{{{\\text{Mass of solvent in kg}}}}{/tex}{tex}\\therefore \\,m = \\frac{{{W_2} \\times 1000}}{{{M_2} \\times {W_1}}}{/tex}Where W1 = mass of solventW2 = mass of soluteM2 = Molar mass of solute . Unit is mol/KgMolarity (m): It is the number of moles of the solute dissolved per litre of the solution. It is denoted by M.Molarity {tex} = \\frac{{{\\text{No}}{\\text{. of moles of solute}}}}{{{\\text{Volume of solution in litre}}}}{/tex}{tex}\\therefore \\;M = \\frac{{{W_2} \\times 1000}}{{{M_2} \\times {V_1}}}{/tex}where W2 = mass of solventM2 = molar mass of soluteV = Volume of solution. Unit is mol/LThe molarity and molality of a solution will be nearly same if the mass of solvent is nearly equal to the volume of solution. | |
| 394. |
What is the difference between precision and accuracy ? |
| Answer» Precision means the closeness of various measurements for the same quantity. For example, if in a lab you weigh a given substance five times, and you get same result each time, then your measurement is very precise. Actually, Precision is independent of accuracy.On the other hand, Accuracy is the agreement of a particular value to the true value of the result. For example, if in a lab you obtain a weight measurement of 4.5g for a given substance, but the actual weight is 9 g , then your measurement is not accurate. Because , in this case your measurement is not close to the know value.<br>Refer to ncert. Perfect explanation is given there | |
| 395. |
Statement of Low of Multiple Proportion. |
| Answer» Law of multiple proportions states that when two elements combine with each other to form more than one compound, the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.<br>What is Avogadro\'s number 0? | |
| 396. |
Define mole and 1mole of a substance |
| Answer» Mole is the metric (SI) unit of amount (not mass or weight) of a substance.One mole is defined as the amount of substance containing as many elementary entities (atoms,molecules,ions,etc.) | |
| 397. |
Calculate mass of photon of sodium light having wavelength 1.894 A and velocity 3×10^8 |
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| 398. |
Why is phosphorus acid (H3PO3) di asic ? |
| Answer» H3PO3 has three hydrogen atoms and looking at the structure it is clear that in H3PO3 only two hydrogen atoms are joined through the oxygen atoms and are ionisable. The third hydrogen atom is linked to P-atom directly and is not ionisable. The H-atom joined to the P- atom is reducing in nature and is not ionisable as a proton and therefore H3PO3 acts as a dibasic acid. | |
| 399. |
how can we write 0.00016 in scientific notation |
| Answer» 1.6 *10^-4<br>16 into 10 to the power minus 5<br>1.6*104 | |
| 400. |
What\'s the volume of hcl |
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