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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. |
Type of physical change |
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Answer» l changes in metals. NON metalshard and SOLID. mostly soft( solid)LUSTROUS. dullmalleable. non melleableductile. non ductilesonorous. non sonorous |
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| 2. |
On the basis of chemical reactions involved, explain how do chlorofluorocarbons cause thinning of ozone layer in stratosphere. |
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Answer» Cs reach the upper atmosphere, they are EXPOSED to ultraviolet rays, which causes them to BREAK down into substances that include CHLORINE. The chlorine reacts with the oxygen atoms in OZONE and rips apart the ozone molecule. |
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| 3. |
What is the role of in the 'greenhouse effect'? |
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Answer» rbs and emits RADIANT energy within the thermal infrared RANGE. Greenhouse gases cause the greenhouse EFFECT. The primary greenhouse gases in Earth's atmosphere are water vapor, CARBON dioxide, methane, nitrous oxide and ozone. |
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| 4. |
The crystalline salts of alkaline earth metals contain more water of crystallisation than the corresponding alkali metal salts, why? |
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Answer» have more water MOLECULES...Reason:As SALTS of alkaline earth metal ions is lower than the size of alkali metal... So lower the size of cation, higher is the Hydration Energy... Hope that it MIGHT help you...!! |
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| 5. |
Convert n of hexabe to benzene. What is this process |
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Answer» on reaction with CR2O3 or V2O5 at 773K give BENZENE. This reaction is known as Aromatization Reaction. |
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| 6. |
Explain is alkaline while is acidic. |
| Answer» ACTS as an alkali because when dissolved in water, it dissociates into the weak ACID carbonic acid and the STRONG alkali sodium hydroxide...CuSO4 acts as an acid as when dissolved in water to GIVE cupric hydroxide which is weak base and sulphuric acid which is strong acid. So hydrogen ION is more... | |
| 7. |
Give the principle and reactions involved in the manufacture of by Solvay’s process. |
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Answer» is used to remove SO2(Sulphur dioxide)(g) from FLUE GASES in power stations. TheSolvay PROCESS (also known as the ammonia-soda process) is the WORLD's major industrial process for the PRODUCTION of sodium carbonate (NaCO3), or soda ash. |
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| 8. |
What happens when: (i) Water reacts with cyanamide of calcium. (ii) Peroxosulphuric acid is hydrolysed. (iii) Moist silver oxide reacts with . |
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Answer» um cyanamide, CaCN2, reacts with water to FORM calcium carbonate and ammonia; CaCN2(s)+3H2O(l)-->CaCO3(s)+2NH3(g). a) How many GRAMS of water are NEEDED to react with 75.0 g of CaCN2? b) How many grams of NH3 are produced from 5.24 g of CaCN2? C) How many grams of CaCO3 form if 155 g of water reacts?ii |
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| 9. |
Name the substance which remain ina test tube after heating ferrous sulphate |
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Answer» that is FERRIC oxide which is reddish BROWN in COLOR REMAIN in a test tube after heating ferrous SULFATE..... |
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| 10. |
Nascent gas formed when concentration hydrochloric acid and concentration nitric acid |
| Answer» ENT gas FORMED when concentration hydrochloric ACID and concentration of nitric acid react together with SULPHUR. | |
| 11. |
Please solve in note book Need your help guys Y =e(sin2x) Find dy/dx = ? |
| Answer» END there's your answerhope it will HELP you | |
| 12. |
Formula of glynamite in chemistry |
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Answer» namite not glynamite. glynamite is a Hollywood MOVIE bro.gylnamite is also known as nitroglycerin.and it's MOLECULAR formula is s C3H5(ONO2)3. |
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| 13. |
Help freinds I need your help |
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Answer» IS WILL HELP YOU |
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| 14. |
Alkanes is the saturated hydrocarbon containing single bond and its formula is cnh2n+2 and alkenes and alkanes are the unsaturated hydrocarbon containing double and triple bond and their formula iscnh2n and formula of alkynes is(cnh2n-2) and c4h10 is butane (alka |
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| 15. |
Electronic configuration of the elements with atomic numbers 1 to 30 |
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| 16. |
What is the meaning of refining a metal? In the electrolyte refining metal M,name the cathode and electrolyte? |
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Answer» electrolyte refining of a METAL, impure meral is made ANODE and a thin strip of pure metal M is made cathode and the electrolyte used is the soluble SALT of metal M which is to be REFINED. |
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| 17. |
Hey MATEQ) What is the uses of Bleaching power ??class 10 |
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Answer» s prepared by passing chlorine GAS through dry slaked lime.Ca(OH)2 + Cl2 -------> CAOCL2 + H2O=> Chemical formula : CaOCl2 => Chemical name : Calcium OXIDE chloride=> Common name : Chloride of lime .__________________________________=> It is used for bleaching cotton and LINEN in textile industry.=> It is used for bleaching of wood pulp in paper factories and for bleaching washed clothes in laundry.=> It is used as an OXIDISING agent in many Chemical industries .=> It is used for disinfecting drinking water to make it free from germs.__________________________________☺☺☺☺ THANKS ☺☺☺☺☺__________________________________BY :@ROYALCHORI ❤ |
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| 18. |
N a two-stage wi r e dr awing oper at ion, t he fract ional r educt ion (rat io of change in crosssect ional area to init ial cross-sect ional area) in the first stage is 0.4. The fract ional reduct ion in the second stage is 0.3. The |
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Answer» ..:............... |
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| 19. |
At higher temp sodium metal reacts with alumina to give a sodium compound x |
| Answer» O3---> 2Al+3Na2O | |
| 20. |
Why dilute H2SO4 is preferred while testing acid radicals over dilute HCL? Don't copied it from google give me perfect answer |
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Answer» hydrochloric acid is not stronger but weaker than concentrated hydrochloric acid. Any SOLUTION which is DILUTE as COMPARED to another solution will always CONTAIN more amount of the SOLVENT. As a result of which its concentration will be less than the second solution. #Be Brainly❤️ |
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| 21. |
Hydrogen is a good reducing agent.why? |
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Answer» n gas is a reducing agent when it REACTS with non-metals and an oxidizing agent when it reacts with metals. Hydrogen ACTS as an oxidizing agent because it accepts an ELECTRON donation from lithium, which CAUSES Li to be oxidized.mark as brainlist Mark as BRAINLIEST if it helps u dear ┏─━─━─━─━∞◆∞━─━─━─━─┓ ✭✮ ӇƠƤЄ ƖƬ ӇЄԼƤ MƛƳ ƳƠƲ ✭✮ MARK AS BRAINLIST ┗─━─━─━─━∞◆∞━─━─━─━─┛ |
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| 22. |
Define asymmetric carbon atom |
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Answer» metric CARBON atom is a carbon atom that is attached to FOUR DIFFERENT types of atoms or groups of atomshope it helpsplz mark BRAINLIEST |
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| 23. |
C12H22O11it gives 12C+11H2O what is the type of reaction |
| Answer» SITION reactionhope it helpsplz MARK BRAINLIEST | |
| 25. |
Difference between metals and non metals |
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Answer» e ur answer is here...*METALS are:-1. Good conductors of electricity2. They have lustre3. They are generally solids at room TEMPERATURE4. Metals form basic oxides*Nonmetals are:-1. Bad conductors of electricity2. They do not have lustre3. They are generally gases and SOLID at room temperature4. Non metals form ACIDIC or neutral oxides........THANKS...Pls mark it as brainliest. |
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| 26. |
Write the quantum number of unpaired electrons in cu2+ |
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| 27. |
Rault's law in hindi |
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Answer» is ANSWER HELPS you..... ☺Please MARK my answer as BRAINLIEST !! |
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| 28. |
Missing Mendeleevs Period Table As Compared Tothe Modern Periodic Table? |
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Answer» number based CLASSIFICATION is ABSENT in Mendeleev's PERIODIC table, isotopes are not PLACED in same group |
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| 30. |
The pH value of 4 solution ABCD are 2 4 6 8 respectively the solution having basic characteristic is |
| Answer» IC SOLUTION is 8 | |
| 31. |
Why did isotopes of elements pose a problem in mendeleevs table? |
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Answer» S WERE PLACED IN DIFFERENT GROUPS is the PROBLEM of isotopes on Mendeleev's periodic table. |
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| 32. |
Which element is a metal that can not be extracted or reduced using carbon? |
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Answer» of HIGHLY REACTIVE metals like Na2O, K2O, etc. cannot be REDUCED or extracted using carbon |
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| 33. |
Name the reagent which is added during the concentration of bauxite ore. Mention the underlying principle of the addition of this reagent Second part of the question |
| Answer» ALUMINIUM oxide (Al2O3), the rest being a MIXTURE of silica, various IRON OXIDES, and titanium dioxide. | |
| 34. |
Give the reaction between chloro benzene and sodium methoxide in presence of cupric salt |
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Answer» NaOCH3----->C6H5OCH3+NaClSo this reaction undergoes Sn2 MECHANISM,but C6H5CL is not likely to undergo such mechanism, so I DOUBT if anisole would be form for or not? |
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| 35. |
What are the sources of dissolved oxygen in water? |
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Answer» dissolves into WATER from two sources: the atmosphere and fromplants in the water. The PRIMARY SOURCE of oxygen for a pond is from microscopic ALGAE (PHYTOPLANKTON) or submerged plants. In the presence ofsunlight, these produce oxygen through photosynthesis and release this oxygen into the pond water. |
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| 36. |
16 g of methanol is present in 100 ml of a solution . if density of the solution is 0.96 g/ml then,the molality of the solution is |
| Answer» TION:this ANSWER will GIVE you help of your MOLALITY concept | |
| 37. |
16gms of methanol is present in 100ml of solution.if the density of the solution is 0.96g/ml .rhe molality of the solution is |
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Answer» tion: this ANSWER will GIVE you help of your molality concept |
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| 38. |
Why is it that on being heated in excess supply of air, K, Rb and Cs form super oxides in preference to oxides? |
| Answer» ND Cs are alkali metals and are in 4th, 5th and 6TH group of the periodic table. We know that the size of the metal atom INCREASES as we go down the group. All the alkali metals form normal oxides of the TYPE in limited supply of air. But when heated in adequate or excess availability of air, normal oxide, peroxide or super oxides are formed depending upon the group to which the alkali metal BELONGS to. 2nd group (Li) → normal oxide 3nd group (Na) → peroxide oxide 4th, 5th and 6th groups (K, Rb and Cs) → super oxide . This is because the stability of normal oxide, peroxide and super oxide increases down the group. Larger cation stabilizes larger anion. Super oxide ions are larger than peroxide ions or normal oxide ions due to lattice energy considerations. | |
| 39. |
assertion :when 4moles of H2 reacts with 2 moles of O2 then 4 moles of water is formed reason:O2 will react as limiting agent |
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| 40. |
Name the products formed on the reaction between copper sulphate and sodium sulphide |
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Answer» been trying for a while to determine what products are produced when COPPER SULFATE reacts with sodium bicarbonate at room temperature and standard PRESSURE. However, while I was looking, I found conflicting INFORMATION concerning what products are formed. Some sources claim that the products are copper hydroxide and sodium sulfate, while other sources state that the products are copper carbonate and sodium sulfate.I believe the REACTION is:CuSO4+2NaHCO3⟶CuCO3+CO2+H2O+Na2SO4 |
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| 41. |
A milkman adds a very small amount of baking soda to fresh milk what happens to its ph |
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Answer» happens because MILK is SLIGHT ACID so when BASE react it remains the same |
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| 42. |
Name the process in which temperature remain constant |
| Answer» MAL PROCESS is the process in which TEMPERATURE REMAIN CONSTANT | |
| 43. |
Which of the following is Covalent?A)H2B)CaoC)kclD)Na2s |
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Answer» ═══════════════╕☬ BRAINLY CONQUERER ☬╘═════════════════════╛Answer is A)H2 because hydrogen forms only COVALENT bonding with itself as there is DIPOLE moment!╒══════════════════════╕☬ THANKS! Regards ☬╘══════════════════════╛ |
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| 44. |
please solve this question :give two disadvantage of long form of periodic table .dont copy it from google give me perfect answer |
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Answer» table is BASED on more fundamental property that is atomic NUMBER .2.this arrangement of ELEMENTS is easy to remember and REPRODUCE. |
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| 45. |
The soil in a field is highly acidic. List any two materials which can be added to the soil giving specific reason. |
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Answer» ............ |
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| 46. |
Calculate elevation in boiling point of aqueous 0.5 kg solution having 6% urea and 18 % glucose by mass. #No spam |
| Answer» ESEE ATTACHMENT for UR SOLUTION | |
| 47. |
Write two effects of ozone depletion on or health |
| Answer» LETION of the ozone layer hasmultiple effects on your health, primarily negative. SINCE exposure to sunlight CAUSES damage to HUMAN tissue, less ozone layer leads to a higher incidence of skin and eye conditions, including skin cancer and eye lesions such as CATARACTS. | |
| 48. |
When a coordination compound nicl2. 6h2o is mixed with agno3, 2 mole of agcl are precipitated per mole of th3 the compound write: (1)structural formula of the complex (2) iupac name of the complex? |
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Answer» coordination COMPOUND NiCl₂. 6H₂O is mixed with AgNO₃, it gives 2 mole of AgCl, therefore the structural FORMULA would contain 2 Cl⁻ ions satisfying primary valency and while 5 H₂O molecule and 1 Cl⁻ ions are PRESENT in the coordination sphere. 1 H₂O molecule will be present as molecule of hydration.1) structural formula = [NiCl(H₂O)₅]Cl₂.H₂O2) IUPAC name = Pentaqua Nickel Chlorido(II) chloride |
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| 49. |
Did dobereiner s triads exist column 8 Newlands octaves |
| Answer» E there was no any 8TH COLUMN in NEWLANDS OCTAVES. | |
| 50. |
Block of the periodic table of the elements consists of the last six groups minus helium (which is located in the s-block). In the elemental form of the p-block elements, the highest energy electron occupies a p-orbital. The p-block contains all of the nonmetals (except for hydrogen and helium which are in the s-block) and semimetals, as well as the post-transition metals.The groups of the p-block are:=>1 |
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Answer» the increasing STABILITY of oxidation states that are TWO less than the group valency for the heavier elements of groups 13, 14, 15 and 16. thnkuuu |
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