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 sodium carbonate and Calcium Carbonate can be separated by solvent extraction method |
|
Answer» Answer: (E) Technique used to separate WATER and Alcohol is Fractional Distillation. ... (G) Technique used is Solvent Extraction Method: Because, by this method, salts get dissolve in water while calcium CARBONATE being INSOLUBLE in water settles down in the container. And hence get separated about. |
|
| 2. |
The colour and the nature of the mixture resulting on mixing the two solution into each |
| Answer» | |
| 4. |
Acidic soil:quick lime::alkaline soil:? |
|
Answer» the FORMULA of quick LIME is calcium hydroxide and formula of ALKANES is cnh2n+2 |
|
| 5. |
What is the ion charge of uranium calcium and germanium? |
|
Answer» Answer: |
|
| 6. |
Amoxycillin & potassium clavulanate with lactic acid bacillus uses |
|
Answer» Answer: Amoxicillin and clavulanate potassium is a combination medicine USED to TREAT many different infections caused by BACTERIA, such as sinusitis, pneumonia, ear infections, BRONCHITIS, urinary tract infections, and infections of the skin. Explanation: make me as brainaliest |
|
| 7. |
Difference between absorbtion spectrum and emission spectrum .. |
|
Answer» Answer: The structure of an atom includes a central core called a nucleus and a cloud of electrons around the nucleus. According to the modern atomic theory, these electrons are positioned in specific ENERGY levels called shells or orbitals where their energies are quantized. The shell which is the nearest to the nucleus is known to have the lowest energy. When energy is given to an atom externally, it causes the electrons to jump from ONE shell to another. These MOVEMENTS can be used to obtain ABSORPTION and emission spectra. Both absorption and emission spectra are line spectra. The main difference between absorption and emission spectra is that absorption spectra show black colored gaps/lines WHEREAS emission spectra show different colored lines in the spectra. |
|
| 8. |
Define with a balanced chemical equation the combination reaction |
|
Answer» A balanced CHEMICAL equation occurs when the number of the different atoms of element in the reacent SIDES is equal to that of the product side Example=2co+o2. ------------ 2co2. Plz marks it's a BRILLIANT answer. |
|
| 9. |
14. Potassium carbonate cannot be made by salvage method? Why? |
|
Answer» Answer: Potasium carbonate is soluble in water and does not PRECIPITATES when carbon DIOXIDE is passed. THEREFORE they cannot made by SALVAGE METHOD |
|
| 10. |
What is socialism in europe |
|
Answer» A communist society was the NATURAL society of the future. List two differences between the capitalist and socialist ideas of private property. By the 1870s, socialist ideas spread through Europe. ... HOWEVER, TILL 1914, socialists NEVER succeeded in forming a government in Europe. |
|
| 11. |
XIV. In cold countries, ethylene glycol is added to water in car radiators to(a)reduce viscosity(c) Make water better lubricant() Lower the freezing point(1) Lower the boiling point |
| Answer» | |
| 12. |
Which o2 molecule is paramagnetic it is explained on the basis ofa. hybridizationb. VBTc. MOTd. VSEPR |
| Answer» | |
| 13. |
Define atomic mass and molecular mass of a substance |
|
Answer» Answer: MOLAR MASS is the mass of one mole per single element while atomic mass is the mass of an atom at REST or is the number of protons and NEUTRONS. Molar mass is MEASURED in grams per mole while atomic mass is “unitless.” |
|
| 14. |
Calculate the radius of the first Bohr orbit of a hydrogen atom and calculate thevelocity and energy of an electron revolving in it. Given: h = 6.626 x 10-J s, E =8.854 x 10-12 cm H mass of electron = 9.109 x 10" kg, and electronic charge= 1.602 x 10-c.(Ans: 5.295 x 10-11 m; 2.188 x 10 m/s; -2.1788 x 10-18 J/atom] |
|
Answer» Dqwerty |
|
| 15. |
Can the substances which form a heterogeneous mixture in water can ever form a homogeneous mixture in any other liquid? Justify your answer giving examples. |
|
Answer» you stir a SPOONFUL of salt into a glass of WATER, salt is the solute that gets DISSOLVED. Water is the solvent. The salty water is now a solution, or HOMOGENEOUS mixture, of salt and water. When DIFFERENT gases are mixed, they always form a solution. |
|
| 16. |
1. Find no. of entities present in 117gm of sodium chloride.2. Find the mass of 2 mole of CO2 |
|
Answer» no. of MOLES =GIVEN MASS/molar mass 2=given mass/44 2x44=given mass 88gm=given mass |
|
| 17. |
Valence shell electron pair repulsion theory is used to predict which of the followinga. energy level in an atom b. the shapes of molecules and ionsc. the electronic getivities in compound'sd. type of bonding in compound's |
| Answer» | |
| 18. |
X. Which of the following is most basic(a) Ammonia(6) Dimethylamine(c) Methylamine(d) Timethylamine |
| Answer» | |
| 19. |
1. Name the sources of waste water and thekinds of contaminants present in each. |
|
Answer» Answer: These waste WATER COMES from industries which contain harmful CHEMICALS , presence of toxic gases and other harmful substances. : The kind of contaminanting SUBSTANCE found in INDUSTRIAL waste water are heavy metals, endocrine disruptors , toxic gases and organic matter. |
|
| 20. |
When the following bond types are listed in decreasing order of strength (strongest first) . which is the correct order?a. covalent > hydrogen > vander Waalsb. covalent > vander Waals > hydrogen c. hydrogen > covalent > vander Waalsd. vander Waals > hydrogen > covalent |
|
Answer» Hydrogen bonds are about 4100 times stronger than Vander Waals forces. Covalent ionic bonds are approximately 2100 times stronger than hydrogen bonds. Answer: covalent > hydrogen > vander Waals (Option A) Explanation: Covalent bond:
Hydrogen bond:
Vander wall forces:
|
|
| 21. |
Explain different method by which reduction takes place? |
|
Answer» Answer: Synthesis / DIRECT COMBUSTION. These chemical reactions occur where two or more substances react together to form just one product. ... DECOMPOSITION reaction. Decomposition reactions have just one REACTANT which breaks up to from two or more simpler products. ... Single Displacement. ... Double Displacement. |
|
| 22. |
A solution has been prepared by dissolving 0.5 g of urea in 25 g water. What is the mass percent of urea in the solution? |
|
Answer» TOTAL = 25.5 so 25.5/100×0.5=urea percent mark branelyst if it REALLY dederves it |
|
| 23. |
IX. Which is strongest acid(a) CH3COOH(b) CICH,COOH(C) CH3CH2COOH(d) FCH2COOHX. Which of the following is most basic(a) Ammonia(6) Dimethylamine(c)Methylamin(d).imethylamineXI. Carbylamine test is given by(a) Primary amines(b) . Tertiary amine(c)Secondary amines(d)None of the above |
| Answer» | |
| 24. |
Please explain with WHY..?! |
|
Answer» The EXPLANATION is STATED above |
|
| 25. |
Balance the reaction: diammine silver (1)chloride + nitric acid |
|
Answer» ammonia SOLUTION dials CALLED as ammonium HYDROXIDE solution |
|
| 27. |
Presence of impuritiesa) lowers the boiling point of the liquidb) does not impact any propertyc) lowers the melting point of the solidd) increases the boiling point of the liquid |
| Answer» | |
| 28. |
The teacher instructed three students ‘A’ , “B’ , and ‘C’ respectively to prepare a 50% (mass/volume) solution of sodium hydroxide(NaOH). ‘A’ dissolved 50g of NaOH in 100ml of water. ‘B’ dissolved 50g of NaOH in 100g of water while ‘C’ dissolved 50g of NaOH in water to make 100 ml of solution.Which one of them has made the desired solution and why? |
| Answer» | |
| 29. |
Which molecule is linear ( 1)SO3 (2 )CO2 (3 ) CL2O (4)H2s |
|
Answer» Co2 Explanation: |
|
| 30. |
C. Round off each of the followingquantities to three significant figures :a. 1.43 cm3 b. 458 x 102 cmc. 643 cm² d. 0.039 me. 6.398 x 10-3 kmf. 0.0179 g g. 79,000 mh. 42,150 i. 649.85;j. 23,642,000 mm 203 235k. 0.0041962 kg1.11 |
| Answer» | |
| 31. |
Pls tell the electronic configuration of elements along a period... |
|
Answer» Electronic Configuration in Periods •The value of n, the principal quantum number, for the valence shell is the period of the element. •Different energy levels can accommodate different number of ELECTRONS. •The maximum number of electrons that a given energy level can accommodate is given by 2n2, where n is the energy level. So the first energy level (K shell) can hold up to 2 electrons, second level (L shell) can hold up to 8 electrons, and third level (M shell) can also hold 18 electrons and so on. Thus, the first period with n = 1 can hold up to 2 elements by filling the lowest level 1s. The elements are Hydrogen and Helium with electronic configuration 1s1 and 1S2 This marks the complete filling of K shell. •The second period starts with Lithium and Beryllium which have 3 and 4 electrons and hence the last electrons ENTER the level 2s and they have an electronic configuration of 1s22s1 and 1s22s2 This is followed by the start of the 2p orbital filling. It starts with Boron (1s22s22p1) and ends with Neon (1s22s22p6) which marks the completion of L shell. Thus, 8 elements are present in the second period. •The third period starts with Sodium and ends at Argon while successively filling 3s and 3p orbitals. 8 elements are present in this period too. •The fourth period with n = 4 starts by filling the level 4s. It begins with Potassium. However, we know that 3d orbital is to be filled before filling of 4p orbital starts. This marks the beginning of the 3d transition elements with Scandium (electronic configuration- [Ar]3d14s2). At Zinc (electronic configuration- [Ar]3d104s2), the 3d orbital is filled. •The fifth period with n = 5 starts by filling the level 5s. This period consists of the 4d transition series which starts with Yttrium. Xenon ends the period by completely filling the 5p orbital. •The sixth period with n = 6 holds 32 elements with electrons filling 6S, 4f, 5d and 6p orbitals. Cerium marks the electrons entering 4f orbital giving rise to the 4f-inner transition elements, called the lanthanide series. •The seventh period with n = 7 includes the man-made radioactive elements with electrons filling 7s, 5f, 6d and 7p orbitals. Similar to period 6, this period also leads to the filling of electrons to 5f orbital, giving rise to the 5f-inner transition elements known as the actinide series. |
|
| 32. |
A colourless gas is flashed with potato chips to prevent them from rancidity. Its oxide is obtainbrown gas when a compound lead nitrate one of its oxide is also known as laughing gas.(c) Write the equation when lead nitrate is heated |
Answer» ANSWER:Chemical equation : |
|
| 33. |
Match The Pairs:' A' 'B'a. Neutrons 1) six electrons b. p-orbital 2) -1.6*10^-19c. charge on electron 3) Ultraviolet Regiond. Lyman series 4)Chadwick |
Answer» Answer:MATCH :( a ). Neutrons - CHADWICK ( B ). p - orbital - 6 electrons ( c ). Charge on ELECTRON - ( - 1. 6 × 10^-19) ( d ). Lyman series - Ultraviolet region. |
|
| 34. |
Explain electroplating of brass spoon with silver ? |
|
Answer» Explanation: When Acetylene is passed in the HYDROGEN gas at the temperature of 573 K in the PRESENCE of the Nickel, it FORMS the Ethene. This Reaction is also known as HYDROGENATION, since there is the addition of the Hydrogen. Ethene will reacts with the Hydrogen again at the same temp. and forms the Ethane. |
|
| 35. |
8.Which one is not application for a thermochemical reaction ?1) It tells about the physical state of the reactants and products2) It tells whether a reaction is exothermic or endothermic3) It tells about the allotropic form (if any) of the reactantA) It tells whether a particular reaction is possible or not |
|
Answer» T - Talented E - Excellent A - Adorable C - Charming H - Humble E - Encouraging R - Responsible. TEACHER is an English word. ... Teacher is a person who educates students in school, college or university. It is one of the most respected jobs in all over the world.Apr 24, 2019 https://www.quora.com › Is-there-a-... Is there a full form for teacher and student? - Quora More results What is your Favourite subject? What is the sentence of teacher? How can I write teacher? Who is good teacher quotes? What are the 7 principles of TEACHING? Who is an ideal teacher? What skills should a teacher have? What is a true teacher? What is the full form of Jio? What is the full form of sir? Feedback www.shortparagraph.com › teacher Web results Short Paragraph on my Favorite Teacher (419 Words) Here is your short paragraph on my favorite teacher: All together I have twenty teachers in my school in total. We have different teacher ... Brainly APP · Installed My favourite teacher 100 words paragraph - Brainly.in 09-Jun-2018 · My favorite teacher was MR. Sunil Dutt who taught me English and Maths for 2 years when I was in class 3rd |
|
| 36. |
....heya....swt hearts................................................................##an alkali metal gives A compound B ( molecular mass= 40) on reacting with water the compound B gives a soluble compound C on treatment with Aluminium oxide .Identify A, B, and C give the reaction involved.............................................................. FOLLOW ME ............................................................. |
|
Answer» Answer: alkali METALS are sodium, potassium, lithium etc. On reacting with WATER , they give metal hydroxide.. M_k (OH)_n Hydroxide molecular mass = 17.. As molecular mass of the metal hydroxide is 40, n = 1 or 2, and correspondingly the molecular mass of metal is 23 or 6. That is metal A is either sodium or lithium. COMPOUND B is : sodium hydroxide or lithium hydroxide.. Lithium hydroxide - molecular mass is not 40.. So metal A is Sodium : Na... compound B is sodium hydroxide. aluminum oxide: Al₂ O₃ + 2 Na OH +3 H₂O ==> 2 Na Al (OH)₄
Compound C : colourless solution in water ... of compound : sodium tetra aluminate.. |
|
| 37. |
XI. Carbylamine test is given by(a) Primary amines(b) . Tertiary amine(C)Secondary amines(d)None of the aboveXII. The hybridization of Nitrogen in an amine is(a) sphybridization© sp2 hybridization(b) sp3d hybridization(d) sp3 hybridizationXIII. Propene reacts with HBr in the presence of Peroxide to give(a) n-Propyl bromide(c)Allyl bromide(b) Vinyl bromide(d) Isopropyl bromide |
Answer» Answer:XI. Carbylamine TEST is given by ✔️( a ). Primary aminesXII. The hybridization of Nitrogen in an amine is ✔️( d). sp^3 hybridisationXIII. PROPENE REACTS with HBR in the PRESENCE of Peroxide to give ✔️(a) n-Propyl bromide |
|
| 38. |
How is ethyl bromide prepared from 1) ethyl alcohol 2) ethane 3) ethene |
|
Answer» ETHYL alcohol + PBr3 = ethyl bromide ethane+ BR2 H(NU) = ethyl bromide ethene + HBr = ethyl bromide |
|
| 39. |
What is mean by molar volume of a gas |
|
Answer» Molar Volume :- The volume occupied by gas at STP (pressure = 1atm , temprature = 273 K) is called molar volume . 1 Molar Volume = 22.4 L or 22400 ml |
|
| 40. |
The mineral in which India depends largely on imports is A. Iron Ore B. Bauxite C. Mica D. Mercury |
|
Answer» Answer: Iron ore There are MANY ports in India like vishakapatnam and ORES like kudhremukh |
|
| 41. |
27. How many water molecules will be lost on dehydrating0.684 g of sucrose?(1) 1.3244 x 102(2) 6.622 x 1021(3) 6.02 x 1020(4) 7.224 x 1021 |
| Answer» | |
| 42. |
Which substance is used to r.etard the setti.ng action of ce.ment? A. CaO B. AlO C. CaSO.2HO D. NaO + KO.. |
|
Answer» Answer: HEY mate... Your Answer is.. C) CaSO. 2HO is used Hope it help you. JAI Hind |
|
| 43. |
Nature of gas on adsorption |
Answer» Adsorption is the adhesion of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface. This PROCESS creates a FILM of the adsorbate on the surface of the ADSORBENT. ... SIMILAR to surface tension, adsorption is a consequence of surface energy.Follow me❤️❤️ |
|
| 44. |
Nature of gas on adsorpton |
|
Answer» Answer: Adsorbed natural gas (ANG) is a process to store natural gas. ... In the ANG process, natural gas adsorbs to a POROUS adsorbent at RELATIVELY low pressure (100 to 900 PSI) and ambient TEMPERATURE, solving both the high-pressure and low-temperature problems. |
|
| 45. |
Which one of the following glasses is used in bullet proof screens? A. Soda glass B. Pyrex glasss C. Jena glass D. Reinforced glass |
|
Answer» hello answer : reinforced glass Explanation: it is also CALLED tempered glass Tempered or toughened glass is a type of safety glass processed by controlled THERMAL or chemical TREATMENTS to increase its STRENGTH compared with normal glass. Tempering puts the outer surfaces into compression and the interior into tension. ... annealed glass) does. hope it helps if it helps MARK brainlest |
|
| 47. |
A beer has ph of 4.30.what is [H3O+] |
Answer» The |
|
| 48. |
One mole of Ar has least density at |
|
Answer» Answer: ONE Mole of Argon has least density at
Explanation: SOLUTION: Density of any gas is GIVEN by the formula : D=DM RT Therefore, The density will be minimum when the RATIO of pressure to temperature is minimum.We can SEE that this is lowest in the 4 option as temperature is maximum and pressure is minimum. THIS IS YOUR ANSWER! |
|
| 49. |
How many grams of NaOH(80% purity) will berequired to noutralize 12.2 g benzoic acid?(a) 12.2g(b) 6g(c) 5g(d) 48 |
|
Answer» MOLECULAR weight of C6H6CO2H= 123gm so 12.2 gm = appx 0.1 mole now 1 benzoic ACID + 1 NAOH = 1 sodium benzoate + 1 water so to neutralise 1 mole benzoic acid we NEED 1 mole NaOH to neutralise 0.1 mole benzoic acid we need 0.1 mole NaOH molecular mass of NaOH = 40 gm so 0.1 mole NaOH =4 gm purity of sample =80% 100 gm sample contain 80 gm NaOH to obtain 4 gm NaOH we need 5 gm sample |
|
| 50. |
Solution that does not change colour either in acidic or basic |
|
Answer» water Explanation: as it is neutral mark me BRAINLIEST PLEASE |
|