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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.
| 3001. |
Which has higher lattice energy and why ?a. BeSO4 or BaSO4b. Be(OH)2 or Ba(OH)2c. BeCO3 or BaCO3. |
| Answer» (a)BaSO4 because bigger cation is stabilize by bigger anion Similarly (b)Ba(OH)2 (c) BaCO3 | |
| 3002. |
Find the molarity of 93% of H2SO4 . If the density of the solution is 1.84 annum. |
| Answer» | |
| 3003. |
What is solution ....¿¿.. |
| Answer» vga all ?<br>Good afternoon ? | |
| 3004. |
What is chemistry ...¿¿..??.. |
| Answer» Royal my Facebook id-Ritesh Gupta Sabko bta dena plz...sowndu ko bhi<br>Study of chemicals | |
| 3005. |
What is mean by nodes? |
| Answer» A knot, knob, protuberance or swelling. (astronomy) The point where the orbit of a planet, as viewed from the Sun, intersects the ecliptic. Any system or device connected to a network is also called a node. For example, if a network connects a file server, five computers, and two printers, there are eight nodes on the network. Each device on the network has a network address, such as a MAC address, which uniquely identifies each device. | |
| 3006. |
Thomson model of atom... |
| Answer» Gud nytt to all ?<br> | |
| 3007. |
How to find Oxidizatotion number of element |
| Answer» An oxidation number can be assigned to a given element or compound by following the following rules.\tAny free element has an oxidation number equal to zero.\tFor monoatomic ions, the oxidation number always has the same value as the net charge corresponding to the ion.\tThe hydrogen atom (H) exhibits an oxidation state of +1. However, when bonded with an element with less\xa0electronegativity\xa0than it, it exhibits an oxidation number of -1.\tOxygen has an oxidation of -2 in most of its compounds. However, in the case of peroxides, the oxidation number corresponding to oxygen is -1.\tAll alkali metals (group 1 elements) have an oxidation state of +1 in their compounds.\tAll alkaline earth metals (group 2 elements) exhibit an oxidation state of +2 in their compounds.\tIn the compounds made up of two elements, a halogen (group 17 elements) have an oxidation number of -1 assigned to them.\tIn the case of neutral compounds, the sum of all the oxidation numbers of the constituent atoms totals to zero.\tWhen polyatomic ions are considered, the sum of all the oxidation numbers of the atoms that constitute them equals the net charge of the polyatomic ion.Thus, the oxidation number of an atom in a given compound can be calculated with the steps mentioned above. | |
| 3008. |
difference between valency and oxidation state |
| Answer» 1.\xa0Valency is the maximum no. of electrons which an atom can lose or gain while oxidation no. is the actual no. of electrons which the element lose or gain to form a molecule.2. Valency is the property of an isolated atom while oxidation state is calculated for an atom is present in a molecule i.e, in a bonded state.3. Valency of an element remains the same while its oxidation state may be different in different molecules.<br>Valency us the capacity to form bonds . Oxidation state is the charge developed on an atom in a molecule | |
| 3009. |
Write main postulates of electromagnetic wave theory |
| Answer» The main points of this theory are:1)The energy is emitted from any source continuously in the form of radiations and is called radiant energy. 2)The radiations consist of electric and magnetic fields oscillating perpendicular to each other and both perpendicular to the direction of propagation of the radiation. | |
| 3010. |
Sncl2+fecl3=Sncl4+fecl2 balance by oxidation number method |
| Answer» | |
| 3011. |
Cu+HNO3=cu(NO3)2+NO2+H2O balance by oxidation number method |
| Answer» | |
| 3012. |
Journalism?? |
| Answer» Journalism is the activity of gathering, assessing, creating, and presenting news and information. It is also the product of these activities. Journalism can be distinguished from other activities and products by certain identifiable characteristics and practices.Journalism is unbiased production and distribution of reports on current or past events based on facts and supported with proofs or evidences. The word journalism applies to the occupation, as well as citizen journalists who gather and publish unbiased information based on facts and supported with proofs or evidences. | |
| 3013. |
What is ratio of elements presents in brass alloy? |
| Answer» Gunmetal alloys contain roughly 88% copper, 8-10% tin, and 2-4% zinc. Lead can be added for ease of machining or for bearing alloys. "Naval brass", for use in seawater, contains 40% zinc but also 1% tin. Brass is a mixture of copper and zinc, which has a harder finish than copper alone. We supply brass to customers for a variety of applications due to its durability and looks. | |
| 3014. |
What is boiling point of alcohol |
| Answer» Right answer is 80°C<br>Wrong answer<br>78 degree celsius<br>Alcohols generally have higher boiling points in comparison to other\xa0hydrocarbons\xa0having equal molecular masses. This is due to the presence of intermolecular hydrogen bonding between hydroxyl groups of alcohol molecules. In general, the boiling point of alcohols increases with an increase in the number of carbon atoms in the aliphatic carbon chain. On the other hand, the boiling point decreases with an increase in branching in aliphatic carbon chains the Van der Waals forces decreases with a decrease in surface area. Thus primary alcohols have a higher boiling point. | |
| 3015. |
What is unit vector?? |
| Answer» Accha ?<br>Hn... Mereko answer ptaa hai ?... Bss aise hi dal diya ?????<br>Okayy... Bol dungi... But ek bar reason bta diya hota to sahi rehta ???? daily puchta hai shraddha aayi kya ????<br>Hlo aadu vese kal hi bataya th? | |
| 3016. |
What is universal solvent ? |
| Answer» A universal solvent is the component of solution in which all solutes (sugar,salt) can be dissolve.water is the universal solvent because it dissolve more types of solute than any other solvent. | |
| 3017. |
Find the energy of the photons which has wavelength of 50A |
| Answer» Energy (E) of a photon having wavelength (λ) is given by the expression,\xa0where , h = Planck’s constant = 6.626 × 10–34\xa0Jsc = velocity of light in vacuum = 3 × 108\xa0m/sSubstituting the values in the given expression of\xa0E:<br>50 | |
| 3018. |
Organic chemistry... |
| Answer» Heyyyy!!! ? | |
| 3019. |
Calculate how much calcium is in the amount of calcium nitrate that content 20 gram of nitrogen |
| Answer» One molecule of\xa0Ca(NO3)2\xa0contains 2 atoms of N.Mass of nitrogen in one mole\xa0Ca(NO3)2\xa0molecule = 28 g ( 2 x molar mass of nitrogen)28g N = one mole molecule of\xa0Ca(NO3)2.20 g N = 1x 20 /28 = 0.71 mole of\xa0Ca(NO3)2.\xa0One molecule of\xa0Ca(NO3)2\xa0contains 2 atoms of N.1 mole Ca(NO3)2 = 40 g Ca0.71 mole\xa0Ca(NO3)2\xa0= 40 x 0.71 = 28.4 g Ca. | |
| 3020. |
Different type of radiation in oder of increasing wavelength |
| Answer» The order is as follow:$$\\boxed{Cosmic\\ rays | |
| 3021. |
WHAT IS MEANT BY QUANTIZATION OF ENERGY |
| Answer» In 1900, a German scientist named Max Planck wrote an equation to show this the relationship between energy and frequency of electromagnetic radiation :\xa0E = hvwhere E is the energy of a bit of light called a\xa0quantum, A quantum is the smallest bit of electromagnetic radiation that can be emitted. It is also called a\xa0photon\xa0of light or small “packet” of electromagnetic radiation. The “h” in the above equation is a very small constant called “Planck’s constant” (6.626068 × 10-34\xa0J s) and “n” is the frequency of the radiation. Through various experiments of Planck and Albert Einstein, it came to be accepted that light has properties of particles as well as waves.\xa0Planck’s “quantum” idea became the basis for the modern understanding of atomic structure. In the above equation, as the frequency of radiation increases, its energy increases by the increment “h”. In other words, energy was not continuous, it was\xa0quantized\xa0– only certain energies are allowed. Continuous energy and quantized energy can be likened to a ramp versus a set of stairs connecting two levels of a building. The ramp is analogous to continuous energy – you can sit at any position along the ramp and thus be at any elevation between the two levels. The stairs are analogous to quantized or\xa0discrete\xa0energy – you can only sit at certain elevations between the two levels and nowhere in between. You may sit only on the steps, not in between the steps. Only certain elevations are allowed. | |
| 3022. |
3.01*10 ni 21 gat oxegen na anu onu dal ketalu thase |
| Answer» | |
| 3023. |
Briefly explain about laws of chemical combination |
| Answer» There are five basic laws of chemical combination that govern the chemical combinations of elements:.\xa0Law of Conservation of MassIn simple terms, this law states that matter can neither be created nor destroyed. In other words, the total mass, that is, the sum of the mass of reacting mixture and the products formed remains constant. Antoine Lavoisier gave this law in the year 1789 based on the data he obtained after carefully studying numerous\xa0combustion\xa0reactions.2.\xa0Law of Definite ProportionsJoseph Proust, a French chemist stated that the proportion of elements by weight in a given compound will always remain exactly the same. In simple terms, we can say that irrespective of its source, origin or its quantity, the per cent composition of elements by weight in a given compound will always remain the same.3.\xa0Law of Multiple ProportionsThis law states that if two elements combine to form more than one compound, the masses of these elements in the reaction are in the ratio of small whole numbers. This law was given by Dalton in the year 1803.4. Gay Lussac’s Law of Gaseous VolumesIn 1808, Gay Lussac gave this law based on his observations. This law states that when gases are produced or combine in a chemical reaction, they do so in a simple ratio by volume given that all the gases are at the same temperature and pressure. This law can be considered as another form of the law of definite proportions. The only difference between these two laws of chemical combination is that\xa0Gay Lussac’s Law\xa0is stated with respect to volume while the law of definite proportions is stated with respect to mass.5.\xa0Avogadro’s LawAvogadro proposed this law in the year 1811. It stated that under the same conditions of temperature and pressure, an equal volume of all the gases contains an equal number of molecules. This implies that 2 litres of hydrogen will have the same number of molecules as 2 litres of oxygen given that both the gases are at the same temperature and pressure. | |
| 3024. |
Who discovered electron?? |
| Answer» [tex]\\mathfrak{J J Thomson}[/tex]<br>JJ THOMSON ☺️☺️☺️☺️☺️☺️<br>JJ Thomson.... Gud Mrng broo ?.....<br>DISCOVERY OF ELECTRON:The Electron was discovered by J.J Thomson by conducting a Cathode ray tube experiment.\xa0 | |
| 3025. |
What is electron gain enthalpy easy definition |
| Answer» Electron gain enthalpy is defined as the amount of energy released when an electron is added to an isolated gaseous atom. During the addition of an electron, energy can either be released or absorbed.<br>Electron gain enthalpy is the amount of energy released when an electron is added to the atom in its isolated gaseous state | |
| 3026. |
Hi $nehil [email\xa0protected]@t remembered me? |
| Answer» | |
| 3027. |
what is limiting regent ?? I think no one can ans this ? |
| Answer» The component in a reaction that limits the formation of product is known as limiting reagent. It determines what amount of product will be formed or in other words the formation of product in a reaction is dependent on the limiting reagent.<br>This reactant generally determines when the reaction will stop. The exact amount of reactant which will be needed to react with another element can be calculated from the reaction stoichiometry. The limiting reagent\xa0depends on the mole ratio, not on the masses of the reactants present.From the illustration shown above, it can be observed that the limiting reactant is the reason the reaction cannot continue since there is nothing left to react with the excess reactant. it is the reactant that entirely consumed over the course of the reaction.Limiting Reagent ExamplesConsider 1 mol of oxygen and 1 mol of hydrogen are present to undergo the following reaction.2H2\xa0+ O2\xa0→ 2H2OSince the reaction uses up hydrogen twice as fast as oxygen, the limiting reactant would be hydrogen.<br>Limiting reagent is the compound in reactant which is available in limited value on which whole product is dependent | |
| 3028. |
The no of oxygen atom in 4.4g of co2 is approximately |
| Answer» Moles of\xa0CO2\u200b= 4.4\u200b/ 44 =0.1\xa0moles∴\xa0Number of molecules of\xa0CO2\u200b=0.1×6.022×1023=6.022×1022\xa0moleculesBut\xa01\xa0molecule of\xa0CO2\u200b\xa0contains\xa02\xa0oxygen atoms.∴\xa0Number of oxygen atoms=2×6.022×1022=12.044×1022\xa0atoms=1.2×1023\xa0atoms | |
| 3029. |
What will be the oxidation state of C in 2-Co3 |
| Answer» | |
| 3030. |
40 gram of calcium is mixed in the solution of 400 ml. what is the molarity of solution |
| Answer» 5/2 M | |
| 3031. |
14 gram of N2 and 1.5 gram of H2 is mixed to form product. find the mole fraction of each |
| Answer» N2 = 2/5 , H2 = 3/5 | |
| 3032. |
nd 1.5 gram of H2 is mixed to form product. find the mole fraction of each |
| Answer» | |
| 3033. |
Why position is not fixed |
| Answer» Change is the basic cause of nature | |
| 3034. |
Find Bond order and magnetic character of ne2 on basis of molecular orbital theory |
| Answer» | |
| 3035. |
How can we covert alkanes to Aldehyde..from chptr hydrocarbons.. |
| Answer» Thnx Maitrey Garde...??<br>first convert Alkane to alkyl group and then add cho to the parent alkyl for example CH3 is methyl group derived from Methane CH4To convert it into aldehyde and CHO to it thus it becomes CH3CHO which is formaldehyde | |
| 3036. |
Description of acyclic and cyclic carbon compounds |
| Answer» Acyclic compoundThese are known as aliphatic compounds. They consist of straight chain or branched compounds.ExampleCyclic CompoundsAlicyclic Compounds:\xa0Alicyclic (aliphatic cyclic) compounds contain carbon atoms joined in the form of a ringHomo-cyclic\xa0: Only Carbon atoms in the ringsHeterocyclic\xa0: Sometimes we have atom other than carbon in the ring also<br>Cyclic compounds are those which have a closed chain... i.e. no end or starting.... it is also called aromatic compounds... E.g. Benzene | |
| 3037. |
What is suspension solution...?? |
| Answer» Hii✌?<br>Suspension:\xa0A suspension is a heterogeneous mixture in which solids are dispersed in liquids. The solute particles in suspension do not dissolve but remain suspended throughout the medium. For example Paints, Muddy water chalk water mixtures etc.Properties of a Suspension• Suspension is a heterogeneous Mixture.• The particles of a suspension can be seen by the naked eye.• The particles of a suspension scatter a beam of light passing through it and make its path visible.• The solute particles settle down when a suspension is left undisturbed, that is, a suspension is unstable. They can be separated from the mixture by the process of filtration. | |
| 3038. |
Effective distance |
| Answer» Based on the idea that places that are connected by large traffic should be effectively closed in a plausible map layout and places with little traffic further apart, we introduced the concept of effective distance (Science 342 1337. ..An interesting aspect of effective distance is its asymmetry. | |
| 3039. |
CH3 -CH-CH=CH I CH3What is its IUPAC name? |
| Answer» 4 buatne | |
| 3040. |
Explain the formation of H2 molecule on the basis of valance bond theory |
| Answer» When hydrogen atoms combine to form molecules of hydrogen, 433 KJ/mol energy is released.Whenever atoms combine to form a molecule ,there is always decrease in the energy. Actually, when two H atoms are far separated, they do not have any force of interaction (attractive or repulsive). As they tend to come closer, two different forces operates:(a) The nucleus of one H is attracted towards the electrons of the other H atoms & Vice versa. The energy is released in attraction.(b) The nuclei of the atoms as well as their electrons repel each other. Energy is needed to overcome the force of repulsion.\xa0 | |
| 3041. |
Name an animal having organ level of organization, bilaterally symetrical, acoelomate |
| Answer» Flatworms | |
| 3042. |
Which is the more stable mgcl2 or nacl |
| Answer» NaCl | |
| 3043. |
How many atoms in 2.3 gram sodium |
| Answer» Na= 232.3 gram No.of NA atom = 6.022×10^23×2.3/23=6.022×10^23 | |
| 3044. |
Round up1. 35.217 2. 11.4108 3. 0.5577 4. 2806 |
| Answer» | |
| 3045. |
Scientific notation: 1. 0.0040 2. 243.000 3. 8008 4. 500.0 |
| Answer» (i) 0.0040 can be written in scientific notation as\xa04.0×10−3.(ii) 234,000 can be written in scientific notation as 2.34×105.(3 8008 can be written in scientific notation as\xa08.008×103.(4) 500.0 can be written in scientific notation as\xa05.000×102. | |
| 3046. |
What is the difference between 104 cm and 104.0cm |
| Answer» 104cm has 3 significant figure and 104.0 cm had 4 significant figure | |
| 3047. |
How many moles are present in 8g of calcium |
| Answer» 0.2 moles<br>1 mole of atoms = Gram atomic massSo, 1 mole of Ca atoms=Gram atomic mass of Ca =40gNow, 40 g of calcium = 1 mole of calciumSo, 8 g of calcium =1/40×5 mole =1/5 mole =0.2 moleThus,there are 0.2 mole in 8 g of calcium.<br>8 ×avagadro no. | |
| 3048. |
Give an example of molecular in six times of empirical formula |
| Answer» \xa0The compound is glucoe. Its molecular formula is\xa0C6H12O6C6H12O6\xa0while empirical formula is\xa0CH2O | |
| 3049. |
Value of one mole |
| Answer» 6.022×10^-23<br>1 mole = 6.022*10^23<br>A mole\xa0is defined as that\xa0amount\xa0of substance which contains Avogadro\'s number of atoms if the substance is atomic or Avogadro\'s number of molecules if the substance is molecular.\xa01 mole\xa0of carbon atoms = 6.022 ×1023\xa0atoms of carbon. | |
| 3050. |
Law of multiple proportion ...?? |
| Answer» | |