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. |
on continuous heating temperature of solid does not change once it starts melting. what happens to the heat energy supplied. hey please give me the full ans. please...... ok if i get so i will mark it as the brainliest |
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Answer» The heat converts into another ENERGY and it makes the SOLID MELT......and again if you ,KEEP it in the same SHAPE and heat it ,it will chnage after cooling ..... |
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| 3. |
Balance the equation......Na20+H20--------2NaOH+H2 |
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Answer» NA2O + 2H2O .......2NAOH +H2O it is the BALANCE equation. |
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| 5. |
Describe a method to separate a mixture of common salt and sand |
| Answer» ONE practical application of chemistry is that it can be used to help separate one substance from another. The reasons materials may be separated from each other is because there is some difference between them, such as SIZE (separating rocks from sand), state of matter (separating WATER from ICE), SOLUBILITY, electrical charge, or melting point. | |
| 6. |
Explain how Earth gets its magnetic energy |
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Answer» When we THROW any OBJECT it can be FALL on the earth because earth have a gravitational FORCE |
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| 7. |
12 litre H2 and 11.2 litre of Cl2 are mixed and exploded . The composition by volume of mixture is ? |
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Answer» The COMPOSITION will BECOME 23.2 LITRE . |
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| 8. |
Which is better nucleophile a bromide or iodide |
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Answer» Nuclieophility increses as we go down the group......so iodide ION is better NUCLEOPHILE than bromide ion because iodine is one ROW down.....the bromine in PERIODIC table..... |
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| 9. |
When 22.4L of H2g is mixed with 11.2 of cl2 g each at STP the moles of stp the moles of hcl g formed is equal to |
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Answer» This is the question of limiting reactant |
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| 10. |
Decomposition of water into hydrogen and oxygen by passing electric current ehich chabge |
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Answer» Electrolysis of water is the decomposition of water into Oxygen and hydrogen gas due to an electric current passed through the water. The REACTION has a STANDARD potential of −1.23 V, meaning it ideally requires a potential difference of 1.23 volts to split water. |
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| 11. |
Crystals of copper sulphate are heated in a test tube for sometime what is the colour of copper sulphate crystals before eating and after eating what is the source of liquid droplets seen on the inner upper side of the |
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| 12. |
In hydrogen atom, which orbital is higher in energy than a 3S orbital??a)2s b)3p c)3d d)4s |
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Answer» As per the Moeller's diagram 3P ORBITAL is higher in ENERGY than a 3s orbital in a hydrogen atom I have ATTACHED the Moeller's diagram picture for your reference hope this helps :) |
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| 13. |
A student wants to perform an experiment to prepare soap in the laboratory. He would choose the appropriate set of required chemical from. |
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Answer» Heyaa,,, |
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| 14. |
Preparation of nylon 6 8 |
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Answer» Nylon is made when the appropriate MONOMERS are COMBINED to from a long CHAIN via condensation polymerization reaction. the monomers for nylon 6-6are ADIPIC acid and HEXAMETHYLENE diamine |
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| 15. |
Difference between diffusion and dissolution |
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Answer» Diffusion is the passage of particles from an area of higher CONCENTRATION to an area of LOWER concentration. |
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| 16. |
Preservaties used in kurkure karare peanuts |
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Answer» Kurkure karare PEANUTS in a plastic BAG which is full of Nitrogen and Kurkure karare peanuts by nitrogen is preserved |
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| 17. |
BaCO3(s) on heating BaO(s) + CO2(g) why this is a decomposition reaction |
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Answer» Because in this a single reactant decomposes into TWO PRODUCTS.. |
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| 19. |
When we heat sand it does not get charred but turns black why |
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Answer» Sand mainly CONTAINS silicon ... after heating silicon the PRODUCT i.e. silicon dioxide is generally BLACK not charred have the REASON... Hope it helps .. plz accept as brainliest... |
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| 20. |
Compare and contrast miscible and immiscible liquids |
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Answer» Miscible liquids 1. Liquids which mix together in all PROPORTIONS and form a single layer are called miscible liquids. 2. They are SEPARATED by the process of fractional distillation. Immisible liquids 1. Liquids which do not mix with each other and form SEPARATE LAYERS are called immiscible liquids. 2. They are separated by USING separating funnel. Hope you are satisfied |
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| 21. |
Calculate relative rate of diffusion of o2 to ch4 in 3:2 mass ratio |
| Answer» HELO this is your aokyes | |
| 22. |
Define alkaline earth metals |
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Answer» Hi, |
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| 25. |
Board what are the factor of evaporation |
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Answer» The rate of evaporation is affected by the FOLLOWING factors: |
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| 26. |
What is the iupac name of this compound |
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| 27. |
Cu(s) + 2AgNo3(aq)= Cu (No3) (aq) + 2Ag(s) why this is a displacement reaction |
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Answer» This is DISPLACEMENT REACTION because more reactive ELEMENT DISPLACES less reactive element. |
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| 28. |
Can you write a chemical equation for a melting of wax what kind of change it is |
| Answer» MELTING if WAX is a PHYSICAL CHANGE | |
| 29. |
Carboxylic acid do not show characteristic reaction of carbonyl group |
| Answer» CARBOXYLIC ACID BELONGS to the acid | |
| 30. |
Calculate the weight of silver atoms that will contain the same number of atoms as are present in 3.175 g of copper metal |
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Answer» Methane has a molecular weight of 16 and 4 atoms PER molecule. Oxygen (O2O2) has a molecular weight of 32 and 2 atoms per molecule. |
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| 31. |
Name the compound formed when Fe, Cu, Ag and Al get corrodedI will mark you as brainliest |
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Answer» FE FORMS fe2o3.xh2o cu forms cuo at forms ago2 al forms AL2O3 |
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| 33. |
Number of atom present in 120 a. m. u of Ca is |
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Answer» Atomic mass of CA is 40 amu |
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| 34. |
Calculate the mass percent of different elements in h2s |
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| 35. |
Calculate the mass of carbon monoxide co that was needed to produce 78g |
| Answer» UR QUESTION is INCOMPLETE... | |
| 36. |
A chemical reaction which is both combination as well as exothermic is used for white washing purposes. write the equation for the sameI will mark you brainliest |
| Answer» CA(OH)2+CO2-CaCO3+H2O | |
| 37. |
Define alkyl halides and allyic halidesGuys plz IT IS too urgent |
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Answer» The replacement of HYDROGEN ATOM in HYDROCARBON by halogen atom then ALKYL halide and aryl halide are form... |
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| 38. |
What is henry law??..... |
| Answer» HENRY's law is one of the gas lawsformulated by William Henry in 1803 and states: "At a constant temperature, the AMOUNT of a given gas that DISSOLVES in a given type and volume of liquid is DIRECTLY proportional to the PARTIAL pressure of that gas in equilibrium with that | |
| 40. |
What is sigma bond????? |
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Answer» In CHEMISTRY, sigma bonds (σ bonds) are the strongest type of covalent chemical bond.[1]They are FORMED by head-on overlapping between atomic orbitals. Sigma bonding is most SIMPLY defined for diatomic moleculesusing the language and tools of symmetry groups. In this formal approach, a σ-bond is symmetrical with respect to rotation about the bond axis. By this definition, common FORMS of sigma bonds are s+s, pz+pz, s+pz and dz2+dz2 (where z is defined as the axis of the bond or the internuclear axis).[2] Quantum theory also indicates that molecular orbitals(MO) of identical symmetry actually mix or hybridize. As a practical consequence of this mixing of diatomic molecules, the wavefunctions s+s and pz+pz molecular orbitals become blended. The extent of this mixing (or hybridization or blending) DEPENDS on the relative energies of the MO's of like symmetry. |
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| 41. |
Give a detailed account of the Lederer-Manasse Reaction |
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Answer» Synthesis of phenol-formaldehyde RESINS by POLYCONDENSATION of phenols in EXCESS amounts of formaldehyde |
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| 42. |
Derive and explain Acid Catalyzed Ring Opening |
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Answer» Titanium and ZIRCONIUM COMPLEXES of bispicolinic amides CATALYZE the ring opening of CYCLOHEXENE oxide with trimethylsilyl azide as nucleophile. The product, 1-azido-2-trimethylsilyloxycyclohexane, was obtained in up to 71% enantioselectivity when a catalyst |
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| 43. |
3° butyl alcohol when oxidized by chromium oxide gives |
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Answer» Answer: Explanation: BUTANONE is formed due to OXIDATION, HOPE you UNDERSTOOD. |
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| 44. |
Why this is a neutralisation reaction KOH(aq) + HCl(aq)= KCl(aq) + H2O(l) |
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Answer» As KOH is a BASE,HCL is a ACID,KCL is a salt and H2O is water. |
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| 45. |
What is a base?how can you detect it? |
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Answer» A BASE is a substance which can donate (OH*-) ion. |
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| 46. |
What is hybridisation of elements? |
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Answer» HEY MATE HERE YOUR ANSWER IS... |
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| 47. |
What is electricity give answer very long |
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Answer» A type of energy fueled by the transfer of electrons from positive and NEGATIVE points within a conductor. Electricity is WIDELY used for providing power to buildings, electric devices, and even some automobiles. A number of individuals are responsible for the development of electricity, but the most notable one is BENJAMIN Franklin and his flying kite experiment. Franklin was ABLE to determine that lightning was a form of electrical discharge. I hope it HELPS you. .Plzz mark it as brainliest. ..... |
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| 48. |
Bond angle in nh3 is greater than bond angle in a s h 3 |
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Answer» Becks in AMMONIA nitrogen is more elctronegarive DUE to which more BOND pair bond pair and bond pair loan pair repulsins |
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| 49. |
Why ionic radius of Na+ is smaller than Na- ??? |
| Answer» NA+ is SMALLER than Na- becauseNa+ is FORMED when an ELECTRON is lost from the Na atom | |
| 50. |
On what basis reaction of black and white photography best |
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Answer» On DECOMPOSITION reaction. |
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