Saved Bookmarks
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. |
WHY DOES ZINC REACT WITH DILUTE SULPHURIC ACID TO GIVE HYDROGEN GAS BUT COPPER DOES NOT ? WRITE THE EQUATION |
| Answer» | |
| 2. |
Sodium benzonate is preservative true or false |
|
Answer» true Explanation: YES SODIUM benzonate is PRESERVATIVE |
|
| 3. |
Which of the following atoms obey duplet rule |
|
Answer» Answer: |
|
| 4. |
The reagent used for the TLC plate development of amino acid is |
|
Answer» Answer: A new spray reagent, 2-hydroxy-1-naphthaldehyde has been INTRODUCED for the detection of amino acids, which is capable of developing several DISTINGUISHABLE COLORS with HIGH sensitivity (0.06–2.0 μg) on TLC PLATES. |
|
| 5. |
if 11.2l of gas is released from 44g of carbon dioxide gas in a container to stp, how many more gases will remain in that container? |
|
Answer» Answer: Mineral resources are non-renewable and include metals, such as, iron, COPPER, and aluminum; and non-metals, such as, salt, gypsum and clay. b. FOREST resources: A forest is defined as an extensive land which is covered by a variety of plants and is a HABITAT for various SPECIES of animals. |
|
| 6. |
Calculate the oxidation no. of under Credatoms in the following> HNO35) Н2so4, с cH3oH |
| Answer» | |
| 7. |
CO + H2 --> CH3OHO que ocorre quando 35,4g de CO são adicionados a 10,2g de H2?a. Sabendo-se que foram obtidos 39,686g de produto, o rendimento da reação foi de 98%.b. A equação química não pode ser balanceada.c. Para obedecer à Lei de Lavoisier, serão formados 45,6g de produto.d. A proporção estequiométrica é de 1: 1: 1.e. Considerando um rendimento de 100% da reação, serão formados aproximadamente 81g de CH3OH. |
|
Answer» jxhshsnsnjsjkkklshhnfjdjdjdjdnjdkd ndjjdjdjfjjfjdjdjjdjd Explanation: jdjjdkdd |
|
| 8. |
Write IUPAC name of all the products formed by cross aldol condensation of butanone and Ethanal.(Hydroxy forms) |
|
Answer» Answer: When an aldehyde (or a ketone) having alpha hydrogen atom is treated with dilute BASE NaOH, KOH or sodium carbonate, two molecules of aldehyde ( or ketone) ADD together to form β hydroxy aldehyde (aldol) or β hydroxy ketone (ketol). New C−C BOND is formed in this reaction. When aldol or ketol is heated in presence of an acid, a molecule of water is lost and α−β unsaturated aldehyde or α−β unsaturated ketone is formed. Aldol condensation of ETHANAL: 2CH
−CHO dil NaOH
CH 3
−CHOH−CH 2
−CHO H +
Δ
CH 3
−CH=CH−CHO+H 2
O Aldol condensation of propanone: 2(CH 3
) 2
CO dil NaOH
(CH 3
) 2
C−OH−CH 2
−CO−CH 3
H +
Δ
(CH 3
) 2
C=CH−CO−CH 3
+H 2
O Explanation: When an aldehyde (or a ketone) having alpha hydrogen atom is treated with dilute base NaOH, KOH or sodium carbonate, two molecules of aldehyde ( or ketone) add together to form β hydroxy aldehyde (aldol) or β hydroxy ketone (ketol). New C−C bond is formed in this reaction. When aldol or ketol is heated in presence of an acid, a molecule of water is lost and α−β unsaturated aldehyde or α−β unsaturated ketone is formed. Aldol condensation of ethanal: 2CH 3
−CHO dil NaOH
CH 3
−CHOH−CH 2
−CHO H +
Δ
CH 3
−CH=CH−CHO+H 2
O Aldol condensation of propanone: 2(CH 3
) 2
CO dil NaOH
(CH 3
) 2
C−OH−CH 2
−CO−CH 3
H +
Δ
(CH 3
) 2
C=CH−CO−CH 3
+H 2
O |
|
| 9. |
Olefin compound of carbene is |
|
Answer» Answer: The term "carbene" may also refer to the SPECIFIC COMPOUND H2C:, also CALLED methylene, |
|
| 10. |
Tell me the temperature of water in thermosphere |
|
Answer» Answer: HI mate! The temperature of the thermosphere gradually INCREASES with height. ... The temperature of this layer can RISE as high as 1500°C (2700°F), though the gas molecules are so far apart that its temperature in the usual sense is not very MEANINGFUL. This layer is completely cloudless and free of WATER vapor. Explanation: Plz mark me brainliest |
|
| 11. |
Write 3 chemical reactions where temperature gets changed |
|
Answer» hope this Will HELP you |
|
| 12. |
Examples of molecule in which inner shell electrons are also involved in their chemical combination? |
|
Answer» Answer: sry for spamming Alnico is a family of iron ALLOYS which in addition to iron are composed primarily of ALUMINIUM (Al), nickel (NI), and cobalt (Co), hence acronym al-ni-co. They ALSO include copper, and sometimes titanium. Alnico alloys are ferromagnetic, and are used to MAKE permanent magnets. Explanation: i couldint find ur name in pinterest give me correct id
|
|
| 13. |
the oxidative cleavage of an alkene to yield a carboxlic acod is only feasible if alkene has at least one ------- hydrogen |
|
Answer» Answer: Alpha. Explanation: The OXIDATIVE CLEAVAGE of an alkene to YIELD a carboxlic acod is only feasible if alkene has at least ONE Alpha hydrogen. Hope it helps. |
|
| 14. |
How many types of elements are involved in biological process? Explain with examples. |
|
Answer» Answer: Living organisms contain relatively large AMOUNTS of oxygen, CARBON, hydrogen, nitrogen, and sulfur (these five ELEMENTS are KNOWN as the bulk elements), along with sodium, magnesium, potassium, calcium, chlorine, and phosphorus (these six elements are known as macrominerals). |
|
| 15. |
Hi.....Explain Haber's process |
|
Answer» Answer: hiii The Haber Process is USED in the manufacturing of ammonia from NITROGEN and hydrogen, and then goes on to explain the reasons for the conditions used in the process. The process COMBINES nitrogen from the air with hydrogen DERIVED mainly from natural GAS (methane) into ammonia. |
|
| 16. |
I WILL MARK AS BRAINLEST IF YOU ANSWER IT CORRECTLY║→NO SPAM ANSWERS PLEASE THEY WILL BE REPORTED←║ |
|
Answer» Answer:Both is oxygen But Y formula is 18 O and X is 16 O |
|
| 17. |
Cu2S + HNO3 -> Cu (NO3)2 + CuSO4 + NO2 + H2O balance this equation and write steps |
|
Answer» MARK me BRAINLIEST PLEASE. |
|
| 18. |
student carries out an experiment to prepare pure magnesium sulphate crystals diagram shows the first stage of the preparation he adds magnesium carbonate until no more reacts was the next stage? |
|
Answer» Answer: The natural environment or natural world encompasses all living and non-living things occurring NATURALLY, meaning in this CASE not artificial. The term is most often applied to the EARTH or some parts of Earth. |
|
| 19. |
Describe pH and pH scale. What is a pH value of pure water and bile juice. What is the importance of pH in our digestive system and to stop the tooth decay?please urgent I will mark u brainlist |
| Answer» | |
| 20. |
Describe pH and pH scale. What is a pH value of pure water and bile juice. What is the importance of pH in our digestive system and to stop the tooth decay?please urgent |
Answer» Definition of ph and ph scale:Acidity and alkalinity are measured with a logarithmic scale called pH. The pH scale measures how acidic or basic a substance is. The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic. The pH values of bile juice and pure water:pH of bile juice between 7 to 8. it slihtly alkine. pH of pure water is 7 at 25⁰c. Importance of pH in our digestive SYSTEM and in the tooth decay:The pH of our stomach is critical to the digestion of many NUTRIENTS and acts as the first line of defense against harmful bacteria and viruses. The stomach is a reservoir of strong acid, with a much LOWER pH than in any other part of our digestive system. The pH of our tooth decay starting is if it is less than 5.5. pH VALUE let us know the NATURE of the tooth. it hrlps us to know about our tooth decay. tooth decay starts if bacteria is present and our teeth are acidic in nature. Hope this helps you. |
|
| 21. |
Who is having the highest degree of dissociation |
|
Answer» A |
|
| 22. |
Define the term hydrogen bond |
|
Answer»
|
|
| 23. |
Which of the following choices represents a balanced chemical equation?A. Ca3(PO4)2 + 6SiO2 → P4O10 + 3CaSiO3B. 2Ca3(PO4)2 + 6SiO2 → P4O10 + 6CaSiO3C. 2Ca3(PO4)2 + 3SiO2 → 2P4O10 + 2CaSiO3D. 3Ca3(PO4)2 + 2SiO2 → P4O10 + 4CaSiO3 |
| Answer» | |
| 24. |
P : nlx helps in writing electronic configuration of an element. Q : nlx helps in identifying the group and period of an element. A) Both are true B) Only P is true C) Only Q is true D) Both are false. |
| Answer» | |
| 25. |
3 examples of a chemical reaction where temperature gets changed. |
|
Answer» Answer: 1 - COOKIES BAKE faster at higher temperatures. 2 - Bread dough rises more quickly in a warm PLACE than in a cool one. 3 - Low body temperatures slow down METABOLISM |
|
| 26. |
Which oxidation states correctlyrepresent the usual range exhibitedby the stated metal?AnswerCe: +3 and +4Th, 2 and +4C. Pu; +3, +4, +5 and +6D. V: +2, +3 and +4 |
|
Answer» Answer: The natural ENVIRONMENT or natural WORLD encompasses all living and non-living things occurring naturally, meaning in this case not ARTIFICIAL. The TERM is most often applied to the EARTH or some parts of Earth. |
|
| 27. |
Which of the following temperature dependent property ? |
|
Answer» die5s5ssr5ksd5l7a86t3j5s57r75s3i5e |
|
| 28. |
10. Convert - a) nitrogen to ammonia by direct combination |
|
Answer» Ammonia GAS is formed by the combination of NITROGEN and hydrogen. N2+3H2→2NH3. |
|
| 29. |
Section B - Letter WritingBW-02NameClassSectionRoll No.1. You, Rohan Shetty, were invited to the shooting of an episode of your favoritetelevision program "Mad About Dance". During the shoot, you met the dance iconMalini Bhargava. Write a letter to your cousin Pawan Malhotra, who lives in Almora inUttarakhand. |
|
Answer» Answer: |
|
| 30. |
3 examples of a chemical reaction where colour gets changed. |
|
Answer» Is that answer |
|
| 31. |
Xenon is a Noble gas still it forms compounds. Why ??? |
|
Answer» Answer: XENON forms compounds because its INNER electrons screen the outer electrons from the NUCLEUS. |
|
| 32. |
A rectangular plot of land is 25 3/4 m long and 15 2/3 m wide. Find the perimeter and area of the plot |
|
Answer» Answer: the formula for this is add the length and WIDE a+b- perimeter and for area formal is LIKE this MULTIPLE length and wide axb- area |
|
| 33. |
Lab assistant drops a salt crystal intoa glass containing a salt solutionlabelled unsaturated. What will likelyhappen to the salt crystal? (Explainyour answer) |
|
Answer» Explanation: This is a very straightforward experiment. It can be CARRIED out individually or in groups of two. Pupils must stand up during heating activities and beware of hot salt spitting when evaporation is almost complete. Equipment Apparatus Eye protection Beaker, 250 cm3 Glass stirring rod Filter funnel Filter paper Conical flask, 250 cm3 Evaporating basin Bunsen burner Heat resistant mat Tripod Gauze Chemicals Mixture of sand and sodium chloride (salt), about 6–7 g per GROUP of students (a suitable sand–salt mixture should contain approximately 20% salt by mass) Health, safety and TECHNICAL notes Wear eye protection THROUGHOUT this experiment. Pupils must stand up during heating activities and beware of hot salt spitting when evaporation is almost complete. Sodium chloride (eg table salt), NaCl(s) - see CLEAPSS Hazcard HC047b. Procedure Pour the sand–salt mixture into the beaker so that it just covers the base. Add about 50 cm3 of water, or add water until the beaker is about one-fifth full. Stir the mixture gently for a few minutes. Filter the mixture into a conical flask. Pour the filtrate into an evaporating basin. Heat the salt solution gently until it STARTS to decrepitate (spit). CARE: Keep eye protection on and do not get too close. Turn off the Bunsen burner and let the damp salt dry in the dish. |
|
| 34. |
13. Explain the free radical mechanism of addition polymerisation with a suitable example |
|
Answer» Answer: Free radicals can be formed by a number of DIFFERENT mechanisms, usually involving separate initiator molecules. Following its generation, the initiating free radical adds (nonradical) monomer units, THEREBY growing the POLYMER chain. ... A chain polymerization in which the kinetic-chain CARRIERS are radicals. hope it HELPS!! if this help you then please mark me as brainliest. |
|
| 35. |
Please send me it's answer1. formula of nitrate of a metal is M(NO3) 2. give the formula of its sulphide, carbonate, oxide, hydroxide and nitride. |
|
Answer» Answer: formula of sulphide is M(S) , CARBONATE is M(Co3), OXIDE is MO, hydroxide is M(OH) 2,and nitride is M3N2 |
|
| 37. |
8. Which one of the following element is more activea) Pt b) cu c)H d) Al |
|
Answer» Aluminum (Al) as PER REACTIVITY SERIES..... |
|
| 38. |
Correlation of Us andof Ueff Values |
|
Answer» s Explanation: gift up UUU it thnx tnxxCopied text is stored in the clipboard for 1 HOUR.Copied text is stored in the clipboard for 1 hour. |
|
| 40. |
How to calculate radius in FCC and BCC crytal structure? Class 12th . |
|
Answer» Answer: FCC:-The relation between EDGE length (a) and RADIUS of ATOM (r) for FCC lattice is √(2A) = 4r .BCC:-The relation between edge length (a) and radius of atom (r) for BCC lattice is √(3a) = 4r .Explanation: Hope it helps :) |
|
| 41. |
@ what is inert pair effets?Why Tic stable thanTicl3 |
|
Answer» Answer: Inert pair effect is DEFINED as The non-participation of the two s electrons in bonding due to the high energy needed for unpairing them. The inert pair theory was proposed by Sidgwick. He along with Powell ACCOUNTED for the shapes of several molecules and correlated the shapes with some of their physical properties. Explanation: The inert pair effect among group 4 and group 5 elements. Sn2+ and Pb2+ and Sb3+ and Bi3+ which are the lower oxidation states of the elements are FORMED because of the inert pair effect. When the s electrons remain PAIRED the oxidation state is lower than the characteristic oxidation state of the group. |
|
| 42. |
Balance the chemical equation by proof in copy please do it |
| Answer» | |
| 44. |
Calculalate the pressure when a force of 250N is exertedon an area of @ 30m |
|
Answer» PRESSURE =force/area p=250/30 p=8.333 |
|
| 45. |
D. Write T for True and F for False. Correct the false statement(s).1. Apart from solid, liquid, and gas, there are two more states of matter--Plasma andEinstein2. Air, carbon dioxide, water, and steam are fluids.3. Most gases can be seen with our naked eyes.4. A molecule is the smallest unit of matter.5. Eight sulphur atoms join to form a sulphur molecule. |
|
Answer» Answer: 1. True. 2.True. 3.False. 4.True. 5.True. Hope it HELPED |
|
| 46. |
Under what condition(s) is themagnitude of average velocity ofan object equal to its averagespeed? |
|
Answer» Answer. when the BODY moves in a straight line the average velocity is equal to average speed. Average velocity would be equal to average speed when the TOTAL distance travelled equals the net displacement of a particle. This happens when a particle moves along a straight line in a FIXED DIRECTION. |
|
| 47. |
Is someone here to solve these questions I need help |
|
Answer» Yes I can SOLVE the balanced chemical equations I) The name of this REACTION is Hydrogenation. II) CH 2=CH 2+Cl 2→ClCH 2−CH 2Cl+H 2 it gives di chlorethane
|
|
| 48. |
P : nlx helps in writing electronic configuration of an element. Q : nlx helps in identifying the group and period of an element. A) Both are true B) Only P is true C) Only Q is true D) Both are false |
|
Answer» Explanation: J.oi.n FAST to SEEEE my di.c.k Horn.y gir.l jo.in fast qmu-bjow-jkc |
|
| 49. |
These questions are of chapter ‘Hydrocarbons’Please help me to overcome my complications in these questions. |
|
Answer» Answer: 1ans Alkenes are relatively STABLE COMPOUNDS, but are more REACTIVE than alkanes because of the reactivity of the carbon–carbon π-bond. ... Because the carbon-carbon π bond is relatively weak, it is quite reactive and can be easily BROKEN and reagents can be added to carbon. |
|