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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. |
How do substances like co2 and water move in and out of the cell short answer? |
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Answer» Water and co2 can MOVE ACROSS the CELL MEMBRANE by the PROCESS of diffusion.;-) |
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| 2. |
Comment on the following statements -a) evaporation produces cooling. b) rate of a evaporation of an aqueous solution decreases with increase in humidity .c) sponge though compressible is a solid With explaination |
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Answer» Answer: a) while Evaporation liquid absorb HEAT from surroundings and evaporates.Thats why CAUSES cooling. b)When humidity is more there is more water in the environment. Therefore it decreases. c)Because sponge has minute HOLES |
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| 3. |
Name on properly which is shown by iodine and not by sodium cloride |
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Answer» Iodine is a critical micronutrient in the human diet—that is, something our bodies can't synthesize that we have to rely on food to obtain —and it's been added to salt (in the FORM of potassium iodide) since 1924. Originally, iodization was adopted to reduce the INCIDENCE of goiter, an enlargement of the THYROID gland. |
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| 4. |
The oxidation state of chlorine is minimum in(A) HOCI(B) Cl2O6(C) KCIO4 (D) NaClO3 |
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| 6. |
How to remember all the reactions of chemistry class 10th and never forget them |
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Answer» Answer: chemistry is a subject where you need to REVISE them lot and practice as many as possible .....while LEARNING a REACTION is not a big DEAL....just revise them on WEEKLY basis |
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| 7. |
oxidation state of nitrogen is fractional in the following A) NH2OH B) NH3 C) N3H D) N2H4 with explanation |
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Answer» Answer: |
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| 8. |
Dithionic acid is not a true member of polythionic acid series |
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Answer» yes, dithionic acid is not true MEMBER of polythionic acid series. due to strong DIFFERENT PROPERTIES. |
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| 9. |
How many hydrogen atoms are present in one mole of ethanol? |
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Answer» ANSWER: 6 Explanation: Formula of ETHANOL is C2H5OH. There are 5 hydrogen atoms attached to the 2 carbon atoms and 1 hydrogen ATOM in hydroxide. |
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| 10. |
How many carbon arm are collinear in 2 4-heptadiyne? |
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Answer» Answer: |
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| 12. |
calculate the number of atoms of oxygen in 8 g of CO2 ? What would be weight of CO having the same number of oxygen atoms? |
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Answer»
no. of ATOM = 2 * 6.022 * 10^23 * 8/ 44
= 2.18 * 10^23 atom of oxygen Now for weight of 2.18*10^23 oxygen mole = 2.18*10^23/6.022*10^23
= 1/3 APPROX. weight of oxygen = 1/3 *32 = 10.66 approx.. weight of (O) 10.66/2 = 5.33 weight of CO = 12+5.33 =17.33 GM... |
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| 13. |
65. How many number of atoms are present in an HCP unit cell :(1) 8(2) 2(3) 1(4) 6 |
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Answer» Answer: the correct answer is 6 ATOM per unit cell mark as brainliast PLZ ☺️♥️ |
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| 14. |
Why does the temperature of a substance remain constant during melting and boiling? |
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Answer» Due to LATENT heat. Explanation: The temperature of a substance remains constant during melting and boiling point because all the heat supplied is used to breaking the bond to change the matter from one states to another. The latent heat is that heat which is used to change the states of matter WITHOUT rising the temperature of matter. hence, during melting and boiling the temperature of matter remains constant TILL whole matter GET converted from one states to another. |
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| 15. |
Name the state of matter in which 1.layer of partical can slip and slide over one another easier |
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Answer» Answer: Explanation: (a)Layers of particles can slip and SLIDE over each other : 1.LIQUID state is the fluid form of matter which can fill the lower part of the CONTAINER . 2.Particles in liquid have LITTLE more inter molecular force than solids. In liquid state particles have little inter molecular space than solids. 3. Hence,particles in liquid state can vibrate , move about and slide past each other. |
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| 16. |
Find the osmotic pressure of solution having 40g of urea in 200 ml water with 30 degree celcius |
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| 17. |
Why atomic radius of an individual atom can't be determined |
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Answer» Answer: because it is too SMALL that we can't DETERMINE it with simple device. Explanation: but we can find the ATOMIC RADIUS also by the most powerful STM. |
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| 18. |
Difference in physical properties of single crystals and polycrystalline solids |
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Answer» Answer: All the symmetry properties of the structure are present in an ideal SINGLE CRYSTAL whereas for polycrystalline substances all the symmetry ELEMENTS are only retained for a single grain which is also a single crystal but very small. |
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| 19. |
How is baking soda turn into baking powder in science? |
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Answer» For MAKING BAKING powder, which is a mixture of baking soda (sodium hydrogencarbonate) and a mild EDIBLE ACID such as tartaric acid. |
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| 20. |
How can it be proved that the basic structure of periodic table? |
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Answer» Answer: there are POSITIVELY CHARGED protons, negatively charged ELECTRONS and neutral neutrons. Explanation: |
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| 21. |
Which physical state of matter is shown by the given statement?1.compressible ,no definite volume |
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Answer» Answer liquid Explanation: because liquid is more COMPRESSIBLE as COMPARED to solid and has no definite VOLUME hope it help please mark it as BRAINLIEST |
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| 22. |
If 40g of O2 dissolve in 500ml of water calculate its partial preesure having kh is 76.4 bar |
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| 23. |
Activity 2.14 of class 10 NCERT Science |
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Answer» Activity2.3 |
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| 24. |
How Bose-Einstein helps us in understanding matter and its properties |
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Answer» Answer: Of the five states matter can be in, the Bose-Einstein condensate is perhaps the most mysterious. Gases, liquids, solids and plasmas were all well studied for DECADES, if not centuries; Bose-Einstein condensates weren't created in the LABORATORY until the 1990s. A Bose-Einstein condensate is a group of atoms cooled to within a HAIR of absolute zero. When they reach that temperature the atoms are hardly moving relative to each other; they have almost no free energy to do so. At that point, the atoms begin to clump together, and enter the same energy states. They become identical, from a physical point of view, and the whole group starts behaving as THOUGH it were a single atom. To make a Bose-Einstein condensate, you start with a cloud of diffuse gas. Many experiments start with atoms of rubidium. Then you COOL it with lasers, using the beams to take energy away from the atoms. After that, to cool them further, scientists use evaporative cooling. "With a [Bose-Einstein condensate], you start from a disordered state, where kinetic energy is greater than potential energy," said Xuedong Hu, a professor of physics at the University at Buffalo. "You cool it down, but it doesn't form a lattice like a solid." Explanation: |
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| 25. |
Which physical state of matter is shown by the given statement?1.Incompreessible, no fixed shape |
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Answer» LIQUID.... .......... |
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| 26. |
Give example of gay lussac's law of gaseous volumes other than the example of hydrogen and oxygen |
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Answer» Explanation: Gay-Lussac's law STATES that the PRESSURE of a given mass of gas varies directly with the absolute temperature of the gas, when the volume is kept constant. MATHEMATICALLY,it can be WRITTEN as:P/T=k. |
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| 27. |
Give an example of a solution in which solid is a solute as well as solvent |
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Answer» Answer: GEM STONES(मडियां) are the collidal solution in which solute and solvent are both SOLID |
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| 28. |
When metals react with acid they produce |
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Answer» Metal+ ACIDS→ Salt + HYDROGEN gas Thus when metals REACT with acids they produce salt and hydrogen gas |
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| 30. |
No of electrons in 1 molecule of co2 |
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Answer» Answer: Hey. The answer is :- 22 One molecule of CO2 CONTAINS one ATOM of carbon and two atoms of oxygen. Each C atom contains 6 electrons. Each Oxygen atom contains 8 electrons. So, the totalnumber of electrons in one molecule of CO2 are 6+2(8)=22. Thank you. |
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| 31. |
Spammers stay away Give me the answer of these questions |
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Answer» ammonium CHLORIDE---pH in the RANGE 4.6 to 6.0.... dilute sulphuric acid ---pH will range from 1 to 6.9,.. potassium carbonate --PH range is 11.5.. chlorine water ---7.4 Ammonium hydroxide ---10.09 |
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| 32. |
3cuso4 + 2al gives al2(so4)3 +3cu which type of reaction |
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Answer» Answer: Explanation: 3CuS04+2Al gives AL2(SO4)2 + Cu Since,Al is highly reactive METAL displaces a less reactive metal copper So its *DisplacementReaction* |
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| 33. |
2. Which among the following is/are double displacement reaction(s)? Select thecorrect option and justify your answer.(i) Pb + Cucl2, — PbCl2 + Cu(ii) Na2SO4 + BaCl2 - BaSO4 + 2Nacl(iii) C + O2 - > CO2(iv) CH4 + 2O2 - CO2 + 2H2O(a) (i) and (iv)(b) (i) only(c) (i) and (ii)(d) (iii) and (iv) |
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Answer» Answer: (a) (i) and (IV) are show DOUBLE DISPLACEMENT REACTION |
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| 34. |
During reaction of some metals with hydrochloric acid |
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Answer» during REACTION of some metals with HYDROCHLORIC acid PRODUCES salt and water. |
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| 35. |
Give three differences between displacement and double displacement reaction |
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Answer» displacement reaction :- it is the reaction in which ELEMENT of a compound displaces. 3. one atom REPLACES. double displacement reaction:- it is the reaction in which the exchange occurs between two atoms and ions get exchanged. 2 . two atom displaces. 3 .two atom replaces. |
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| 36. |
Gas thermometer are more sensitive than liquid thermometer because |
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Answer» Answer: as the molecules of GAS are loosely packed they suffer from more movement of their MOLECULE in contact with SMALL AMOUNT heat too.. whis leads to more sensative READING |
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| 37. |
How to find redox reaction |
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Answer» Explanation: Oxidation numbers are a convenient way of identifying redox reactions and also indicating which element is oxidized and which is reduced. Here's an example - the reaction between sodium metal and chlorine gas: 2Na+Cl2⟶2NaCl It is often useful to write the oxidation number for every element, in every compound, above the element in the equation. Thus for our reaction we have: Be sure to note that the balancing coefficients in the equation (the "2" in front of Na and in front of NaCl ) do not affect the value of the oxidation numbers. We'll return to these coefficients soon. A chart is a useful way for us to SUMMARIZE the changes in oxidation number for each element: element initial ox no ox no change in electrons (e-) oxidized or reduced Na 0 → +1 lost 1 e- oxidized Cl 0 → -1 gain 1 e- reduced We see several important things in our table Since oxidation numbers did change, this was a redox reaction Na 's oxidation number increased - from 0 on the reactant side to +1 on the product side. An element becomes more positive by losing electrons. Loss of electrons is Oxidation (LEO) Cl 's oxidation number decreased, from 0 to -1, as chlorine gained electrons. Gain of electrons is Reduction (GER) An increase in oxidation number indicates oxidation A decrease in oxidation number indicates reduction Let's try another example. Identifying what is oxidized and what is reduced - and how many electrons are involved - is very important to master now for we will expand upon this skill shortly. Consider the reaction 2Mg+O2⟶2MgO Determine oxidation numbers for all elements in every compound: 0 0 +1 -2 2Mg+O2⟶2MgO Summarize the changes, determine the number of electrons transferred per atom, and IDENTIFY what is oxidized and what is reduced: element initial ox no final ox no change in electrons (e-) oxidized or reduced Mg 0 → +2 lost 2e- oxidized O 0 → -2 gain 2e- reduced Two new terms before we continue. You will recall that we mentioned in the first section of this unit that oxidation cannot occur without reduction, and vice versa. The substance losing electrons (undergoing oxidation) gives its electrons to the substance gaining electrons (undergoing reduction). If the reduced substance will not accept electrons, the oxidized substance could not give away electrons. Thus, one allows for the other to occur. Reducing agent the substance that is oxidized. It allows another element to be reduced. Oxidizing agent the substance that is reduced. It allows another element to be oxidized. In our last example above, magnesium was oxidized, therefore it was the reducing agent. Oxygen was reduced, therefore it was the oxidizing agent. By convention we often refer to the oxidizing agent and reducing agents as the entire compound the element is in, not just INDIVIDUAL element. Consider the following reaction. Oxidation numbers are shown only for substances whose oxidation numbers undergo a change: 0 +5(N) +2(Zn) +4(N) Zn+HNO3⟶Zn(NO3)2+NO2+H2O Summarize: element initial ox no final ox no e- oxidized or reduced Agent Zn 0 → +2 lost 2e- oxidized reducing agent: Zn N +5 → +4 gain 1e- reduced oxidizing agent: HNO3 We see that HNO3 is referred to as the oxidizing agent, not just N. One final thing to note in this example - notice that the nitrogen in Zn(NO3)2 did not undergo a change in oxidation number. Here is a final example. Consider the reaction N2+2H2⟶2NH3 Determine oxidation numbers for all elements in every compound: 0 0 -3 +1 N2+2H2⟶2NH3 Summarize the changes, determine the number of electrons transferred per atom, and identify what is oxidized and what is reduced, and identify the oxidizing agent and reducing agent: element initial ox no final ox no e- oxidized or reduced Agent N 0 → -3 gain 3e- reduced oxidizing agent: N2 H 0 → +1 lose 1e- oxidized reducing agent: H2 Back to top 1.2: Oxidation Numbers 1.4 Balancing Redox Reactions Using Oxidation Numbers Recommended articles |
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| 38. |
Phosphorus is available in(A) red and blue colours. (B) blue and green colours. (C) blue and black colours. (D) red and yellow colours |
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Answer» Answer: As I have STUDIES Phosphorus is found in white,black,VIOLET and black colours DEPENDING on the BONDS |
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| 39. |
Define emulsion with example |
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Answer» ★ COLLOIDAL systems in which both the DISPERSED phase and the dispersion MEDIUM are liquids. ★ There are two types of emulsion: 1). Oil dispersion in water. 2). Water dispersion in oil. ★ Emulsifying agent : The THIRD component used for stablising an emulsion. ★ Emulsification : PROCESS of making an emulsion. ★ Example : Oil and water mixtures are emulsions when shaken together. The oil will form drops and disperse throughout the water. |
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| 40. |
How to calculate the number of atoms of carbon in 40L of C4H10 |
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Answer» Answer: I am CONSIDERING the solution in NTP CONDITIONS . No. of moles= 40/22.4 no of CARBON atom = 4× no. of moles I hope you GOT it. |
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| 41. |
(A) jar contains red brown gas and (B) jar contains colourless gas they are seperated by a glass plate1. what will happen when the glass plate betwen them is pulled away 2. what name is given to the phenomenon that takes place 3. what is that brown gas 4. which is the colourless gas in (B) 5. name one colourless solid and colour liquid to show the phenomenon in the jar |
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Answer» Explanation: 1 The gases will mix 2 diffusion 3 BROMINE gas 4 air 5 oxygen and bromein gas |
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| 42. |
Does perchloric and acetic acid smell affects fertility |
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Answer» Explanation: : Chronic exposure to ACETIC acid may cause EROSION of dental enamel, ... and thawing does not affect PRODUCT quality. ... Odor: PUNGENT odor - vinegar odor ... during |
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| 43. |
Dry hclis not acidic whereas its aqueos solution is |
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Answer» Dry HCLIS not acidic WHEREAS its aqueos solution is. This is because gaseous HCl does not dissociate to give up protons and CHLORIDE ions. But, in AQUEOUS solutions HCl does dissociate and exist . |
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| 44. |
Fractional distillation is suitable for separation of miscible liquids |
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| 45. |
Functional group interaction for conductivity in graphene oxide |
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Answer» i am very sorry |
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| 46. |
Formula for electric field intensity of a solid metallic charged sphere |
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Answer» Answer: The electric field of a point charge Q can be obtained by a straightforward application of Gauss' law. Considering a Gaussian SURFACE in the form of a sphere at radius r, the electric field has the same magnitude at every point of the sphere and is DIRECTED outward. The electric FLUX is then just the electric field times the AREA of the sphere. Explanation: |
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| 47. |
Define adsorptionwrite any two features which distinguishes physisorption from chemisorption |
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Answer» Answer: The process by which a solid holds molecules of a GAS or LIQUID or SOLUTE as a thin film is CALLED adsorption. For physisorption, under appropriate conditions, gas PHASE molecules can form multilayer adsorption. In chemisorption, molecules are adsorbed on the surface by valence bonds and only form monolayer adsorption. Hope it helps |
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| 48. |
Plz answer fast...it is needed |
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Answer» I) Na2S 2) CaSiO3 3) 2H2O 4) O2 5) Fe3O4 6) 5CaO 7) Na2SO4 8) FE(OH)3 HOPE THIS HELPS.... MARK ME AS THE BRAINLIEST PLEASE.....✌ |
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| 49. |
What isits valency what is the number of valence electrons in X? |
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Answer» 8-x=valency, is the answer |
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| 50. |
Why does the temperature remain same during melting while all the ice changes into water |
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Answer» Because the all energy loss to break the INTERMOLECULAR force. So there is no temperature change in CONVERTING of ice to WATER. HOPE it will HELP you |
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