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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 is the formula of sodium peroxide |
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Answer» NA2O2 Na2O2 Na2O2 Sodium peroxide is the inorganic compound with the formula Na2O2. Sodium peroxide is Na2O2 |
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| 2. |
Why only alkene shows cis isomerism |
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Answer» Cis-trans isomerism is common in alkenes because there is restricted rotation about double bonds.Explanation:For example, an alkene such as but-2-ene has two different groups on each alkene carbon.It can exist as E−Z isomers that differ in the positions of the substituents on the double-bonded atoms.The double bond prevents rotation about the C=C axis.So the molecule exists as two isomers, with substituents on the same side (cis) or on the opposite side (trans) of the double bond. Due to double bond formation and have one π bond and one sigma bond |
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| 3. |
KAL(SO4)2.12H2O what is the oxidation state of S ?Plzz ,show complete process |
| Answer» K => +1 Al => +3 O == -2 let x = oxidation number of S 1 +3 + 2x -16 = 0 2x - 12 = 0 2x = 12 x = + 6Therefore, the oxidation numbers of S is +6 | |
| 4. |
reaction of hydration of acetylene |
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Answer» only reaction i need Do u want the reaction with proper diagram ? |
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| 5. |
What is formal charge?? |
| Answer» “The formal charge over an atom of a polyatomic molecule or ion is the difference between the valence electron of that atom in the elemental state and the number of electrons assigned to that atom in Lewis structure.”Mathematically, it can be expressed by following formula:F.C. = [Total no. of valence e– in free state] – [total no. of e– assigned in Lewis structure]F.C. = [Total no. of valence e– in free state] – [total no. of non-bonding pair e– (lone pair)] – 1/2 [total no. of bonding e–]The factor of ½ is attached to the no. of bonding e– because bonding e– is shared between two atoms. | |
| 6. |
What is salt bridge and its function |
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Answer» salt bridge is the bridge contained in electrolytic cell and it is of u shaped. \xa0A salt bridge is a U- shape containing concentrated solution of an inert electrolyte like KCl, KNO3, K2SO4 etc.or a solidified solution of those electrolytes in agar-agar solution and gelatin.These inert electrolytes do not take part in redox reaction of the cell and even dont react with the electrolyte used.The main functions of a salt bridge are;\tThey allow the movement of ions from one solution to another without mixing of the two solutions and complete the electrical circuit.\tTo maintain the electical neutrality of the solutions in the two half cells. |
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| 7. |
CBSC important questions for board exam |
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Answer» Yes u will get in this app U will get it in this app |
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| 8. |
Examples of dextrorotary compounds?? |
| Answer» D- lactic acid | |
| 9. |
What is the liquid non metal |
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Answer» Mercury Those non metal which is found in liquid state at room temperature called liquid non metal. |
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| 10. |
-Write the mechanism of free radical substitution reaction.Ch4+cl2------h√------> ch3--Cl+ Hcl |
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| 11. |
Hybridization in H2o |
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Answer» Sp3 hybridisation No....H2O has sp3 hybridisation................................sp3 is correct ✅ Hybridization in H2o is Sp |
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| 12. |
The following set of quantam numbers is not possible. Explain,why,? N=2,l=3,m=-3,m=+1/2 |
| Answer» As azimutal quantum number must be less than the principal quantum number | |
| 13. |
Sir i am not able to understand chemistry properly please help me |
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Answer» Ya alakh pandey\'s lectures are superb both of chemistry and physics Watch the video of physics wallah its very helpful Read ncert... write all reactions in page. Memorize atleast 30 first elements of periodic table. Then in numericals. Write all given things connect it with formula and what all we need to write ans. Take help of teachers or youtube videos. Dont feel ashamed to ask doubts which is small or big. U are going to learn in school or tution. Ask as many doubts as possible. Just read ncert book line by line and word to word |
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| 14. |
What are zeolites |
| Answer» Zeolites are microporous, hydrated aluminosilicates of sodium, potassium calcium etc | |
| 15. |
IUPAC name of CH3-CH-CH2-CHO / OH |
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Answer» Butanal and butanol When cho is attached, the name is ------------- Butan-1-al, and when oh is attached ------- Butan-1-ol |
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| 16. |
Relation between acid and base |
| Answer» Acid genrates h+ ions whereas base generates oh- ions | |
| 17. |
Relation between PH and POH? |
| Answer» PH =14-POH | |
| 18. |
Define Molar heat capacity? |
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Answer» The amount of heat required to raisi 1°C of 1 mole. cp/cv |
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| 19. |
Absolute and kelvin scale of cycle graph representation |
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| 20. |
whose boling point is more in b/w ch4 and cf4 . explain |
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| 21. |
What is the functional group of an aldehyde |
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Answer» -CHO is a functional group for aldehyde.Formyl is prefix.al is suffix. Formyl or oxo |
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| 22. |
Structure of 1,1_ Dichloro ethene |
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Answer» its impossible to draw structure in this app . just search the intermet Structure of Acctone |
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| 23. |
When benzene is used and when phenol is used❓ |
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Answer» In easy way benzene is a closed ring having molecular formula C6H6 but if we replace one hydrogen of benzene with --OH group then we can say its iupac name as benzen-1-ol or simply " Phenol" .Phenol will have molecular formula as C6H6O Phenyl name is used when you can no longer use Benzene as a parent name in IUPAC system of naming and it must be used as a substituent. |
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| 24. |
Graph between ideal gas and real gas on the basis of boyles and charles law |
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| 25. |
Why are pentahelids are more covlent then trihelids ? |
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| 26. |
What are polyfunctional group?? |
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Answer» Two or more functional groups In That example C=O Organic compounds that contain two or more functional groups are called polyfunctional compounds. For example O || CH3- C-CH2-COOH More than one functional group. |
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| 27. |
What is the size of ionic radius in period??? |
| Answer» Values of ionic radius are difficult to obtain and tend to depend on the method used to measure the size of ion. A typical value fir an ionic radius would be from 30 pm (0.3 °A) to 200 pm ( 0.2 °A) | |
| 28. |
Why is carbon make a long chain of organic copaund |
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Answer» Due to having high canetation tendancy To complete its valency |
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| 29. |
What is Rasonance? |
| Answer» When a molecule cannot be represented by a single structure then various structures of nearly similar energy , similar position of atoms and same bonding and lone pair electrons are written, these are known as resonance structures and their mixed form is called resonance hybrid. Which confirms the actuaal structure and this concept is called resonance | |
| 30. |
Chemical reactivity order in alkali metals(aqous). |
| Answer» increases down the group | |
| 31. |
How to prove that light ( electron) shows both particle and wave nature experimentally??? |
| Answer» First of all light is photon different from electron, its wave nature can we shown by double slit experiment and reflection of light shows its particle property. | |
| 32. |
What is carcinogenicity???? |
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Answer» Cancer producing agent may be this related to cancer A substance or agent that can cause cells to become cancerous by altering their genetic structure so that they multiply continuously and become malignant. Asbestos, DDT, and tobacco smoke are examples of carcinogens. |
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| 33. |
What is newman projections ???? Please explain in easier way |
| Answer» \tIn Newman projection, the carbon-to-carbon bond conformation is viewed head on, that is front to back.\tThe carbon atom at the front is represented as a dot and the carbon atom at the back is represented as a circle.\tThe hydrogen atoms attached to the carbon atoms are shown by lines. The bond angle between these lines is kept at 120 degrees.\tThe hydrogen atoms connected to the carbon atom in the front are represented by longer lines, and those connected to the carbon atom at the back are represented by shorter lines. | |
| 34. |
What is enthalpy of neutrisation?? |
| Answer» The enthalpy of neutralization (ΔHn) is the change in enthalpy that occurs when one equivalent of an acid and one equivalent of a base undergo a neutralization reaction to form water and a salt. It is a special case of the enthalpy of reaction. It is defined as the energy released with the formation of 1 mole of water. | |
| 35. |
Predict shape of sf4 using vsepr. Also give the reason for the stability of the acquired shape. |
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Answer» Tetrahedral as it is sp3 hybridrised and all sp3 hybridised molecules have Tetrahedral shape predicted by vsepr Tetrahedral |
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| 36. |
Any Kvian here Pls I want some guidance from you |
| Answer» | |
| 37. |
Penetration power |
| Answer» | |
| 38. |
What is the use of borax |
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Answer» Borax bead test in laboratory Borax is used in leather industry ,medicinal soaps etc. Used in carpet cleaning, borax cleans violin strings, borax removes rust, used in cleaning outdoor furniture In manufacturing of glass |
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| 39. |
What is radioactive decay ? |
| Answer» Radioactive decay is a process by which unstable atomic nucleus looses energy by emmiting radiation. | |
| 40. |
Why is molecule of helium (He2) not formed??? |
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Answer» Because in the formation of HE2 molecule repulsive force between the atoms is dominant over attractive force Since , single molecule of He has complete its duplet and become inert.And we know that inert gases donot react. So formation of He ^2 is not possible. Also if you want to confirm mathematically you may find the bond order. If it comes zero, it wont exist....,......,...,........???? |
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| 41. |
What is disproportionation reactions |
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Answer» Type of redox reaction in which same species get oxidised and reduced simultaneously to form at least two dissimilar products . Reaction in which get oxidised and reduced |
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| 42. |
Balence the redox reaction using oxidation number methodSO2 + H2S------>S+H2O |
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| 43. |
What is the formula of Boyle\'s law |
| Answer» Boyle’s lawAt constant temperature, the volume of a given mass of a gas is inversely proportional to its pressure............................. PV = K= Constant P1V1 = P2V2 = K (T = Constant) | |
| 44. |
What is Lechatelier\'s principle |
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Answer» It states that when a change is made in any of the factors that determines the equilibrium conditions of a system will cause a system to change in such a way so as to reduce or conteract the effect of the change Le Chatelier\'s principle states that when a system in chemical equilibrium is disturbed by a change of temperature, pressure, or a concentration, the system shifts in equilibrium composition in a way that tends to counteract this change of variable. |
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| 45. |
What are reducing character? |
| Answer» Those which decrease the oxidation state of central atom of the compound. | |
| 46. |
inert pair effect kya hain?? |
| Answer» Inert pair effect is mostly shown by the 15-17th group elements. That is, the oxidation state reduces by 2 for elements down the group, which is more stable than the other oxidation states. The reason for this is the inertness of the inner electrons due to poor shielding............?? | |
| 47. |
What is crystel radius.?? |
| Answer» It is the radius of an atom\'s ion in ionic crystal structure....? | |
| 48. |
Difine wavelength \'frequency. Velocity wave number amplitude |
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Answer» The amplitude of a wave is a measure of the displacement of the wave from its rest position. Wavenumber - no. Of wavelengths per unit length. Wavenumber equals to reciprocal of wavelength. the wavelength is the spatial period of a periodic wave—the distance over which the wave\'s shape repeats. It is thus the inverse of the frequency. |
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| 49. |
Chemistry question paper of class 11th 2015-2016 |
| Answer» You\'ll get in this app cbse previous years question paper | |
| 50. |
WHAT ARE H2O2 OXIDIZING AND REDUCING PROPERTIES |
| Answer» Hydrogen peroxide behaves as an oxidising as well as reducing agent in both acidic and basic solution. The oxidation state of oxygen in hydrogen peroxide is -1 .It can be oxidised to oxygen or reduced to water or hydroxide ion. Hydrogen peroxide act as an oxidising agent both in acidic as well as alkaline medium . In presence of strong oxidising agent, hydrogen peroxide behave as a reducing agent in acidic as well as alkaline medium.In these reactions, molecular oxygen is always produced by the combination of H | |