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. |
Give the comparative for 3states of matter in the basis of rigidity |
|
Answer» There are 3state of matter 1 Solid 2 gas 3 liquid Solid--when we take a liquid and put them into the freezer it turns ICE gas-- when we boil water it gets heated then waters CHANGE water vapour this is example of gas Liquid-- when we put ice in heating point or in a heated area then it turn ice into liquid Hope this ANSWER may help you Mark me as brainlist please follow me |
|
| 2. |
Can we get caustic soda(naoh) in medical? |
|
Answer» no Explanation: |
|
| 3. |
Starting with barium carbonate describe how you can prepare a dry sample of barium sulphate |
|
Answer» Answer: Well, you need to KNOW the atomic weight of Platinum (Pt) and the number of atoms PER mole. The answer to the former is 195.084 g/mole and the latter is 6.023 * 10^23 atoms/mole. Then, multiply everything as shown below: Number of atoms = (1 g) * (1/195.084 g/mole) * 6.023 * 10^23 atoms/mole Number of atoms = 3.087 * 10^21 atoms Note, I’ve INCLUDED UNITS on everything and you can see that they all cancel except for atoms. Dragging the units along can be a pain but it is a great way to check that they way the numbers are being combined is CORRECT. |
|
| 5. |
Why for beryllium z value is 4 |
|
Answer» Answer: Z is DENOTED as ATOMIC no. of an element, atomic no. = no. of PROTONS + no. of electrons thus beryllium has atomic no.(Z) is 4 please marks me as brainliest |
|
| 6. |
Arrange solids, liquids and gases in order of increasing:a)Densityb)Diffusionc)Fluidity |
|
Answer» Explanation: a)DENSITY:solid, liquid and GAS b)DIFFUSION:gas, liquid and solid c)FLUIDITY:gas, liquid and solid |
|
| 7. |
M^{2+} (aq) ion (Z = 27) के लिए ‘प्रचक्रण-मात्र' चुंबकीय आघूर्ण की गणना कीजिए। |
|
Answer» YUVA yiixooyxxiyxoyxyixyo |
|
| 8. |
कॉपर के लिए EV का मान घनात्मक (+0.34V) है। इसके संभावित कारण क्या हैं? (संकेत- इसके उच्च EV और hyd EV पर ध्यान दें)। |
|
Answer» hhannsjxjsjnn nnmmkmmmm |
|
| 9. |
सिल्वर परमाणु की मूल अवस्था में पूर्ण भरित d कक्षक (4d^{10} ) हैं। आप कैसे कह सकते हैं। कि यह एक संक्रमण तत्व है? |
| Answer» | |
| 10. |
Give the relation between kp and kc for the for the reaction 2nocl (g) =2no(g)+cl2(g) |
Answer» Answer:Explanation:We have chemical equation : We are asked to find relation between : We know : Hence we get REQUIRED answer.Read more : What is the effect of temperature on SOLUBILITY of gases in LIQUIDS? E + F ⇄ EF [ K = 1 x 10⁻³ ] Out of AB and EF, which one is more stable AB or EF? |
|
| 11. |
Is it correct to say that P-type semi conductor is neutral??¿¿ Explain ur answer. |
|
Answer» Answer: yes it's NEUTRAL. Explanation: Because U c, we R doping the metal with a trivalent neutral atom , not with an ion. And the metal in which the trivalent neutral atom is doped if it is neutral from the beginning, it will REMAIN neutral.....in the semiconductors only the electron and HOLES roam around only in the metal and they don't leave the metal |
|
| 12. |
What happened when copper sulfate pentahydrated is gently heated? |
|
Answer» PLEASE mark it as a brainliest and please follow me |
|
| 13. |
Here as we know the symbol of chlorine is Cl the why there is Cl2... written. |
|
Answer» We know that each elements form compounds or make bonds in order to complete THIER octet and achieve a stable electronic CONFIGURATION CL has 7 electrons in it's outermost shell it requires ONE more electron in order to complete it's octet Hence CL forms a bond with another Cl thus sharing electrons and become stable Cl2 I HOPE this helps ( ╹▽╹ ) |
|
| 15. |
In alitre flask at a temperature there are 2gm of H2 and 8gm of O2 .the mole fraction of O2 . Int the given mixture is X×10 power minus one .the value of x is |
|
Answer» Solution: MOLE of A/(Mole of A + B) = Mole Fraction → MASS of HYDROGEN gas = 2 gram → Mole of hydrogen gas = 2 gram/2 g/mol → Mole of hydrogen gas = 1 mol → Mass of OXYGEN gas = 8 gram → Mole of oxygen gas = 8 gram/32 g/mol → Mole of oxygen gas = ¼ mol → Mole fraction of O₂ = Mole of O₂/(Mole of H₂ + O₂) → x × 10⁻¹ = (¼)/(1 + ¼) → x/10 = (1/4)/(5/4) → x/10 = 1/4 × 4/5 → x/10 = 1/5 → x = 2 Hence, VALUE of x is 2 |
|
| 16. |
Write a balanced chemical equation to represent the following reaction-carbon monoxide reacts with hydrogen gas at 340atomic pressure to form methyl alcohol |
| Answer» | |
| 17. |
How much heat is required to transform ice at -20°C to water at 50°C....... |
|
Answer» Answer: |
|
| 18. |
calculate the number of grams of AL2S3 which can be prepared by the reaction of 20g of (Al) and 30g of (sulphur).How much the non_limiting reactant is in excess? |
|
Answer» Answer: 20g of AL = 20/26.98 mol = 0.74 mol 30g of S = 30/32.07 mol = 0.94 mol so, only min(.74/2,.94/3) = 0.31333 mol of Al2S3 can be formed: .31333 mol Al2S3 = .61667*26.98g Al + .94*32.07 G S = 16.64g Al + 30g S That leaves 3.36g Al unreacted |
|
| 19. |
How much water should be added to 15 grams of salt to obtain 15% salt solution . |
|
Answer» Answer: x=85g Explanation: (a)CONCENTRATION of solution = 15% Mass of solvent = 15 + X Concentration of solution = (Mass of solute / Mass of solution) X 100 15 = (15/15+X) x 100 15 + X = (15/15) x 100 X = 100 - 15 X = 85 g (b)In an aqueous solution, the solute is dissolved in Water; whereas in case of non - aqueous solution, solute is dissolved in any liquid other than water. (c)Sodium chloride gets dissolved in water COMPLETELY and forms true solution whereas milk into water forms a colloidal solution which shows Tyndall effect. |
|
| 20. |
If the velocity of the electron is 2.19 x 10 6 m/s. Calculate the wavelengthassociated with it. (1)(h = 6.626 x 10 -34 Kg m 2 /s, m = 9.1 x 10 -31 Kg) |
|
Answer» Solution: According to De Broglie's equation → λ = h/MV; where each one stands for
Note: mv together can be wrote as “p” which stands for term momentum. → λ = (6.626 × 10⁻³⁴)/(9.1 × 10⁻³¹ × 2.19 × 10⁶) → λ = (6.626 × 10⁻³⁴)/(9.1 × 2.19 × 10⁻³¹⁺⁶) → λ = (6.626 × 10⁻³⁴)/(9.1 × 2.19 × 10⁻²⁵) → λ = (6.626 × 10⁻³⁴⁺²⁵)/(9.1 × 2.19) → λ = (6.626 × 10⁻⁹)/(9.1 × 2.19) → λ = 0.33 × 10⁻⁹ → λ = 3.3 × 10⁻¹⁰ m Wavelength of ELECTRON is 3.3 Å |
|
| 21. |
What is the effect of temperature on the kinetic energy of the partides of matter? |
|
Answer» Answer: When heat energy is added to a substance, this RESULTS in an increase in the KINETIC energy of its PARTICLES, that is, the particles MOVE at higher SPEEDS. Since temperature is a measure of the average kinetic energy, the temperature increases. Thank you !! |
|
| 22. |
When barium chloride and sodium sulphate are mixed together. What will you observe?What is the name of the reaction? |
|
Answer» Explanation: I THINK a precipitate is FORMED which is WHITE in colour. It is a precipitation reaction which is also a double displacement reaction. please mark as BRAINLIEST. |
|
| 23. |
Newland's law of Octaves: |
|
Answer» Law of octaves, in chemistry, the generalization MADE by the English chemist J.A.R. Newlands in 1865 that, if the chemical elements are arranged according to INCREASING atomic weight, those with similar physical and chemical properties OCCUR after each interval of seven elements. Newlands was one of the first to detect a periodic pattern in the properties of the elements and anticipated later developments of the periodic law. Brainest plzzzzzzzzzzzzzzzz |
|
| 24. |
in comparison to 0.01 M solution of glucose the depression in freezing point of a 0.01 M MgCl2 solution is |
|
Answer» o*selcious dgsgefuirsotdoteo5eo5eo5eoteotpyeypr |
|
| 25. |
What happens when CH3COOH is tearted with phenopthalein |
|
Answer» chhutti KITCHEN OPPORTUNITY |
|
| 26. |
Explain when metals reacts with acid with diagram |
|
Answer» Explanation: When acids react with metals, they produce a salt and hydrogen GAS. Most metals react with acids, but not all. The general EQUATION that describes the CHEMICAL reaction between an acid and METAL is metal + acid = salt + hydrogen gas. Plz mark me as brainliest and FOLLOW me |
|
| 27. |
Composition of lipids |
|
Answer» Answer: Lipids are COMPOSED of a glycerol molecule bonded to long HYDROCARBON chain(s) (can be single or multiple) and, depending on the LIPID, to other molecules—such as a PHOSPHATE GROUP |
|
| 28. |
1. Before burning in air, the magnesium ribbon is cleaned by rubbing with a sandpaper to:a. Make the ribbon surface shinierb. Remove the layer of magnesium oxide from the ribbon surfacec. Remove the layer of magnesium carbonate from the ribbon surfaced. Remove the moisture from the ribbon surface2. In a chemical reaction between sulphuric acid and barium chloride solution thewhite precipitates formed are of:a. Hydrochloric acidb. Barium sulphatec. Chlorined. Sulphur3. The respiration process during which glucose undergoes slow combustion bycombining with oxygen in the cells of our body to produce energy, is a kind of:a. Exothermic processb. Endothermic processc. Reversible processd. Physical process4. A chemical reaction does not involve:a. Formation of new substances having entirely different properties than that of thereactantsb. Breaking of old chemical bonds and formation of new chemical bondsc. Rearrangement of the atoms of reactants to form new productsd. Changing of the atoms of on element into those of another element to form newproducts5. One of the following processes does not involve a chemical reaction. That is:a. Melting of candle wax when heatedb. Burning of candle wax when heatedc. Digestion of food in our stomachd. Ripening of banana6. It is necessary to balance a chemical equation in order to satisfy the law of:a. Conservation of motionb. Conservation of momentumc. Conservation of energyd. Conservation of mass7. All the methods mentioned below can be used to prevent the food from gettingrancid except:i. Storing the food in the air-tight containersii. Storing the food in refrigeratoriii. Keeping the food in clean and covered containersiv. Always touching the food with clean handsa. (i) and (ii)b. (i) and (iii)c. (i), (iii) and (iv)d. (iii) and (iv)8. Rusting of iron involves a chemical reaction which is a combination of:a. Reduction as well as combination reactionsb. Oxidation as well as combination reactionsc. Reduction as well as displacement reactionsd. Oxidation as well as displacement reactions9. You are given the following chemical reaction:Heat 2 2 CuO + H Cu + H OThis reaction represents:a. Combination reaction as well as double displacement reactionb. Redox reaction as well as displacement reactionc. Double displacement reaction as well as redox reactiond. Decomposition reaction as well as displacement reaction10. When ferrous sulphate is heated strongly it undergoes decomposition to formferric oxide as a main product accompanied by a change in colour from:a. Blue to green.b. Green to blue.c. Green to brown.d. Green to yellow.11. Which of the following gases is used in the storage of fat and oil containingfoods for a long time?a. Carbondioxide gasb. Nitrogen gasc. Oxygen gasd. Neon gas12. The displacement reaction between iron (III) oxide and a metal X is used forwelding the rail tracks. Here X is:a. Copper granulesb. Magnesium ribbonc. Sodium pelletsd. Aluminium dust13. The neutralization reaction between an acid and a base is a type of:a. Double displacement reactionb. Displacement reactionc. Addition reactiond. Decomposition reaction14. The chemical reaction between Hydrogen sulphide and iodine to giveHydrogen iodide and sulphur is given below:2 2 H S + I 2HI + SThe reducing and oxidizing agents involved in this redox reaction are:a. Iodine and sulphur respectivelyb. Iodine and hydrogen sulphide respectivelyc. Sulphur and iodine respectivelyd. Hydrogen sulphide and sulphurChapter 2ACIDS BASE AND SALTS1. Some fruits like mango, lemon, raw grapes, orange, etc., have a sour taste due tothe presence of:a. Acetic acidb. Citric acidc. Lactic acidd. Oxalic acid2. Zinc granules on treating with an acid X, form the zinc sulphate (ZnSO4) saltalong with the evolution of a gas Y which burns with a pop sound when broughtnear to a burning candle. Identify the acid X and gas evolved Y.a. X- Sulphuric acid and Y- Oxygen gasb. X- Hydrochloric acid and Y- Oxygen gasc. X- Sulphuric acid and Y- Hydrogen gasd. X- Hydrochloric acid and Y- Hydrogen gas3. The figure given below represents the experiment carried out between conc.sulphuric acid and sodium chloride, which react with each other to form HCl gas.Blue litmus paper is brought near the mouth of the delivery tube to check thepresence of HCl acid but no change is observed in the color of litmus paperbecause:a. The litmus paper used is dryb. The litmus paper used is moistc. Blue litmus paper does not change its color with an acidd. The litmus paper is kept very close to the mouth of the delivery tube |
|
Answer» Explanation: 3 answer exotermic reaction and 6 TH answer is CONSERVATION of MASS 7 th answer storing the food in air tight container |
|
| 29. |
What is chemistry?? |
Answer» CHEMISTRY is the the branch of science concerned with the substances of which matter is composed, the INVESTIGATION of their properties and reactions, and the USE of such reactions to form NEW substances... |
|
| 30. |
निम्नलिखित में से कौन सा एक अस्तित्व में नहीं है। |
|
Answer» hstjryidrkrkrskryizdykdykdgj,XGK,dykxfulxfukxfukfuk |
|
| 31. |
जीनॉन फ्लुओराइड, कैसे बनाए जाते हैं? |
| Answer» | |
| 32. |
उस उत्कृष्ट गैस स्पीशीज का सूत्र देकर संरचना की व्याख्या कीजिए जो कि इनके साथ समसंरचनीय है- [tex](i) Icl^{4-}(ii) Ibr^{2-}(iii) BrO_3[/tex] |
|
Answer» mhdjzdyjdykzdyjjySjdy\3(\₹6(6(_6(_4643=43473*4/hsyjeyjskkstlstkr Z |
|
| 33. |
किस उदासीन अणु के साथ समइलेक्ट्रानी है? क्या एक अणु लुइस क्षारक है? |
|
Answer» HM sthstheyjdyjaetjaejeyjetajEYJwtjsTjJtjsgdmgmdg;5$6;dgjdtzjdtjdyzjdy |
|
| 34. |
निम्नलिखित में फ़ॉस्फोरस की ऑक्सीकरण अवस्थाएं क्या हैं?? |
|
Answer» Answer: The objects sinking or floating in water depends on the density of the object. If the object has more density than water then it will SINK in water. Example of such objects is- rock, MARBLE, steel, iron, copper, NICKEL, gallium, SAND, beryllium and MERCURY. ... |
|
| 35. |
निम्नलिखित प्रत्येक समुच्चय को सामने लिखे गुणों के अनुसार सही क्रम में व्यवस्थित कीजिए।-(क) आबंध वियोजन एन्थैल्पी बढ़ते क्रम में (ख) HF, HCl, HBr, HI^- अम्ल सामर्थ्य बढ़ते क्रम में ।(ग) क्षारक सामर्थ्य बढ़ते क्रम में |
|
Answer» I can't UNDERSTAND Hindi Explanation: |
|
| 36. |
निम्नलिखित के लिए संतुलित समीकरण दीजिए।(i) जब NaCl को की उपस्थिति में सांद्र सल्फ्यूरिक अम्ल के साथ गरम किया जाता है।(ii) जब क्लोरीन गैस को Nal के जलीय विलयन में से प्रवाहित किया जाता है। |
|
Answer» II) is the answer BRO MARK BRAINLIEST |
|
| 37. |
Features of Mandeleev's preodic table. |
Answer» Characteristics of Mendeleev's periodic table:i) Elements arranged in increased atomic mass. Elements, with similar properties GROUPED together in periods (HORIZONTAL rows) and columns (vertical rows). |
|
| 38. |
Please answer my question . |
|
Answer» ANSWER:C because in SN2 reaction PRIMARY COMPOUND has more reactivity. Explanation: |
|
| 39. |
The boiling point of a water is a hundred Celsius express this is Si units |
|
Answer» Answer:373K Explanation: |
|
| 40. |
Amide are weak base. why |
|
Answer» Explanation: Compared to AMINES, amides are very weak bases. ... This relative lack of basicity is explained by the WITHDRAWING of electrons from the amine by the carbonyl. On the other hand, amides are much STRONGER bases than carboxylic ACIDS, esters, aldehydes, and KETONES (their conjugate acids' pKas are between −6 and −10). |
|
| 41. |
Can we consider all these acid and bases as electrolytes |
|
Answer» <STRONG>Explanation: SOLUBLE ionic substances and strong ACIDS ionize completely and are strong electrolytes, while WEAK acids and bases ionize to only a small EXTENT and are weak electrolytes. Nonelectrolytes are substances that do not produce ions when dissolved in water. |
|
| 42. |
Why O2 and F2 have different increasing order of energies? |
|
Answer» DUE to DIFFERENCE in electronegativities. Fluorine is the most ELECTRONEGATIVE ELEMENT. |
|
| 43. |
Why a unbalanced equation is called skeletal equation? please explain in brief |
|
Answer» Answer: An unbalanced EQUATION is a chemical equation in which the TOTAL NUMBER of atoms of each element on the REACTANT side is not equal to the number of atoms of the same element on the product side. This equation is also CALLED a skeletal equation. |
|
| 44. |
What are strong weak bases & give example |
|
Answer» STRONGER acids have a larger acid DISSOCIATION constant (Ka) and a SMALLER LOGARITHMIC constant (pKa = −log Ka) than weaker acids. |
|
| 45. |
Please answer than iwill follow |
|
Answer» hope this HELPS you.Mark me as BRAINLIEST if you GOT the correct answer |
|
| 46. |
What are acid and base indicators? Their type and colour change acidic and basic medium |
|
Answer» Answer: An acid-base indicator is either a WEAK acid or weak base that exhibits a COLOR change as the concentration of HYDROGEN (H+) or HYDROXIDE (OH-) ions changes in an aqueous solution. Acid-base indicators are most often used in a titration to identify the endpoint of an acid-base reaction. |
|
| 47. |
What is the meaning of chimestry |
|
Answer» Answer: mark as BRAINLIEST answer PLEASE I need 1 brainliest answer for virtuso Explanation: the scientific study of the STRUCTURE of substances and what happens to them in different conditions or when MIXED with each other |
|
| 48. |
A solution of sugar water would be best classified aselement, compound, heterogeneous, homogenous |
Answer» A HOMOGENEOUS MISTURE = (sugar+water) |
|
| 49. |
जल के साथ तथा की अभिक्रियाएं लिखिए। |
|
Answer» Answer: Hey mate your answer is here Explanation: प्रबल ऑक्सीकारक होने के कारण F, जल को 0, या 0; में ऑक्सीकृत कर देता है। • 2F2 (g) + 2H2O (l) → 4HF (AQ) + O2 (g) • 3F2 (g) + 3H2O (l) → 6HF (aq) + O3 (g) Cl2 जल से क्रिया कर हाइड्रोक्लोरिक तथा हाइपोक्लोरस अम्लों का निर्माण करता है। Hope it helps u Mark me as BRAINLIEST !!! Follow me !!! |
|
| 50. |
स्पष्ट कीजिए कि फ्लुओरीन केवल एक ही ऑक्सोअम्ल, HOF क्यों बनाता है। |
Answer» फ्लोरीन सर्वाधिक विद्युत ऋणात्मक तत्त्व है और केवल -1 ऑक्सीकरण अवस्था ही प्राप्त कर सकती है। इसका परमाणु आकार भी काफी कम होता है। इस कारण यह उच्च ऑक्सी अम्लों जैसे- HOXO, HOXO2 तथा HOXO3 आदि में केन्द्रीय परमाणु के रूप में स्थित नहीं हो पाती है और केवल एक ही ऑक्सी अम्ल HOF का निर्माण करती है। इस अम्ल में इसकी ऑक्सीकरण अवस्था-1 है। |
|