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. |
The relative molecular masses of hydroge, nitrogen, oxygen and chlorine are_ |
|
Answer» Are double of their relative ATOMIC mass as they exist as diatomic molecules. Explanation: Hope it will HELP you pls give me a heart an d MARK me as BRAINLIEST.. |
|
| 2. |
In 2.24 ltr of co2 (g) at STP. Find no:of electrons,protons & neutrons. |
|
Answer» Answer:6.02×1023 3.01×1023 3.01×1024 5.1×1024 Answer : B Solution : 22.4litreNH3=1moleNH3=10Nelectron Explanation: |
|
| 3. |
120 cm cube of a gas is taken at 273 K the temperature is and raised to 0 degree Celsius what is the new volume of the gas pressure kept constant |
| Answer» | |
| 4. |
If 2 moles of h2 required to form 2 moles h2o then 56gm h20 will produced form |
| Answer» | |
| 5. |
Washing soda contain |
|
Answer» Answer: The CHEMICAL FORMULA for washing soda is Na2CO3 or SODIUM CARBONATE. It's a salt of CARBONIC acid, a chemical that produces a wide range of salts collectively known as carbonates. The sodium carbonate "softens" water helping other cleaning ingredients lift soil from the fabrics and suspend the soil in the wash water. |
|
| 6. |
Preparation of ozone |
|
Answer» Answer: Ozone is PREPARED in laboratory by PASSING silent electric discharge through dry oxygen. By passing the electric current some of the oxygen molecules dissociate and then atomic oxygen COMBINES with oxygen molecules to FORM ozone. The p Block Elements Chemistry Notes The mixture thus obtained contains 5 – 10% ozone by volume and the mixture is called as ozonised oxygen. The apparatus used for this purpose is known as ozoniser. Explanation: |
|
| 7. |
How will you bring the followingConuerstions:(1 Hydrogen to Hydrogen Chloride(i) Carbon dioxide to carbonic acid(ro) Sulphur dioxide to sulphurous aidCvi Potassium oxideto potassium hydroside(₂) Sodium oxide to sodium hydroxide |
| Answer» | |
| 8. |
Question Number: 15CH,The IUPAC name of C1-C-01-CH, isak-ca,(A) 2-Ethyl-2-methylpropane(B) 2.2 Dimethylbutane(C) 1.1.1-Trimethylpropane(D) 2. 2-Methylbutane |
| Answer» | |
| 9. |
Define deliquescenc |
|
Answer» Answer: Explanation: DELIQUESCENCE, the PROCESS by which a substance ABSORBS moisture from the atmosphere until it dissolves in the absorbed water and forms a solution. Deliquescence OCCURS when the vapour pressure of the solution that is formed is less than the partial pressure of water vapour in the air. |
|
| 10. |
S orbital doesn't show any preference fir direction. why? |
|
Answer» Because the answer to this |
|
| 11. |
2] A proton from active methylene group can be removed byA] A baseB] An acidC] A metal |
|
Answer» Answer: (a) A base Explanation: The hydrogens of an ACTIVE methylene group can be easily removed by bases such as ALKOXIDE because the resulting CONJUGATE base is HIGHLY stabilized by resonance. |
|
| 13. |
The mass number of an atom is equal to 31 M shell atom contains equal to 5 electrons write the electronic configuration of atom |
|
Answer» k=2 L=8 M=5 it is PHOSPHORUS |
|
| 14. |
14] Hydrogens in acetaldehyde are more acidic than in acetone because ofA] Hyperconjugation effect B] Inductive effectC] Resonance |
|
Answer» a Explanation: |
|
| 15. |
Select a covalent oxide of a metalloid from the following SO2 sio2 al2o 3mg so na2o |
|
Answer» Explanation: |
|
| 16. |
Complete the following reactions:(1) C2H4 + 02(11) 4Al + 3O2 |
|
Answer» Answer: 1) (i) C2H4 + O2→ 2CO2 + 2H2O Ethane in reaction with oxygen GIVES CARBON dioxide and water. 2) (ii) 4Al + 3 O2→ 2Al2O3 Aluminum on reaction with oxygen gives alumina. hope this will HELP you Please mark me as brainlest |
|
| 17. |
Define law of conservation |
|
Answer» The law of conservation of mass or principle of mass conservation states that for any SYSTEM closed to all TRANSFERS of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so QUANTITY can neither be added nor be REMOVED. |
|
| 18. |
No more solute can be dissolved in a solution at a given temperature is called |
|
Answer» No more solute can be DISSOLVED in a SOLUTION at a given temperature is called saturated solution. |
|
| 19. |
Three beakers A, B and C containing solutions of glucose, alcohol and Hydrochloric acid respectively are given to you. Explain an activity to prove that only HCl conducts electricity while glucose and alcohol do not. |
|
Answer» Answer: hcl contain H+. ions so it passes electricity Explanation: take a beaker add hcl keep graphite rods in the beaker start SUPPLY of current the BULB GLOWS more dark than glucose and alcohol |
|
| 20. |
Give me the calculation of 1 upon 6 into 10 to the power of 23 into 1 into 10 to the power of 22. |
| Answer» | |
| 21. |
Y=2,6z=2,8,223) which element belongs to the 2nd period?24) which element belongs to the 24 group?25) which element belongs to the 18 group? |
|
Answer» Explanation: 23. Y BELONG to 2nd period 24.24th group not exist 25. Z and Y don't belong to 18TH group Z belong to 2nd group Y belong to 16th group |
|
| 22. |
Answer all the questions quick |
|
Answer» 1. No. of hydrogen ATOMS in one MOLE of H₂ 2 x 6.022 x 10²³ = 12.044 x 10²³ atoms __________________________________________________________ 2. Molar mass of Cu = 63.5 G/mol No. of moles of Cu in 0.3175 g is: 0.3175.63.5 = 0.005 moles No. of atoms = 0.005 x 6.022 x 10²³ = 30.11 x 10²⁰ atoms __________________________________________________________ 3. Volume of 1 mole of CH₄ = 22.4 L (it is a standard value BRO) as you KNOW, 1 mole of methane contains: 6.022 x 10²³ molecules __________________________________________________________ 4. No. of moles of methane = 25/16 = 1.5625 No. of molecules = 1.5625 x 6.022 x 10²³ = 9.409375 x 10²³ molecules No. of C atoms = 1 x 1.5625 x 6.022 x 10²³ = 9.409375 x 10²³ atoms No. of H atoms = 4 x 1.5625 x 6.022 x 10²³ = 37.6375 x 10²³ atoms __________________________________________________________Please mark me brainliest |
|
| 23. |
Calculate wave number of the line having frequency 5×10^16 hertz |
|
Answer» Answer: 1.6 × 8 Explanation: |
|
| 24. |
Who born in October please follow me.. |
|
Answer» Answer: GANDHI ji Explanation: |
|
| 25. |
Assertion :A mixture of ammonium chloride and salt is separated by sublimation. Reason : Ammonium chloride is a sublimable substance. *(iii) Assertion is true but reason is false.(i) Both reason and assertion are true and reason is the correct explanation of the assertion.(ii) Both the assertion and reason are true and the reason is not the correct explanation of the assertion.(iv) Both assertion and reason are false. |
|
Answer» Answer: Sublimation is change in physical STATE directly from solid to gas.AMMONIUM chloride is a sublimable COMPOUND which CONVERTS directly from solid to gas.so,ammonium chloride can be separated from sand using sublimation Explanation: |
|
| 26. |
22. Discuss how size of elements varies when we move from up to down within a group? |
|
Answer» Explanation: AS WE MOVE DOWN THE GROUP THE SIZE OF ELEMENTS INCREASE BECAUSE ATOMIC RADIUS INCREASES ATOMIC RADIUS INCREASES DUE TO INCREASE IN NO OF SHELLS INCREASE OR WE CAN SAY THAT DUE RO INCREASE IN ATOMIC NUMBER HOPE IT HELPS YOU THANK YOU✌️ |
|
| 27. |
Metal are formed from__ chloride |
|
Answer» Answer: Alluminium Explanation: ALUMINIUM chloride is also sometimes referred to as aluminium trichloride or aluminium (III) chloride. The compound is FORMED when aluminium and CHLORINE are REACTED TOGETHER. Its chemical formula is written as AlCl3. As for physical appearance, Aluminium chloride is usually white. |
|
| 28. |
Explain superconductivity |
|
Answer» Answer: SUPERCONDUCTIVITY is the set of physical properties observed in certain materials where ELECTRICAL resistance VANISHES and magnetic FLUX FIELDS are expelled from the material. Any material exhibiting these properties is a superconductor. Explanation: hope it helps:) |
|
| 29. |
Red light have wavelength 750nm were as violet light has wave length 400nm calculate their energy |
|
Answer» Answer: RED LIGHT energy is 1.653 E.v and voilet energy 3.1 e.v E=hc/wavelength also E= (1240/wavelength(in nm))e.v |
|
| 30. |
Angular quantum number of 2p5 is- |
|
Answer» Answer: For an atom with 17 electrons, the CONFIGURATION is, 1s22s2p63s2p5. Therefore the 17th electron is in p ORBITAL with n=3 and l=1 plz mark me BRAINLIEST |
|
| 31. |
21. An element A belongs to the third period and 19 group of the periodic table, then find outwhether A is metal or Non-metal.22. Discuss how size of elements varies when we move from up to down within a group ? |
|
Answer» Answer: first of all 19 group doesn't exist in the PERIODIC table on moving up to down size of the elements increase Explanation: for EXAMPLE lithium size = 152 sodium size = 186 |
|
| 32. |
Calculate the no. Of molecules of oxygen in 0.2 mole of oxygen |
|
Answer» Answer: ∴ 0.2 MOLE of oxygen atoms = 16 × 0.2 = 3.2 G (b) 1 mole of water molecules = 18 g ∴ 0.5 mole of water molecules = 18 × 0.5 = 9 g 10. Hope it's HELPFUL.... |
|
| 33. |
Write about anomalous position of some pairs of elements in M P T |
|
Answer» Explanation: Explanation: The anomalous pair of elements are those elements which do not follow the increasing order of their ATOMIC WEIGHT in the Mendeleev PERIODIC table. Argon (Ar) and CARBON(C) are placed before the Potassium (K) and Nickel (Ni) respectively but they have comparatively higher atomic weight. thank you please mark me brainliest and please follow me. |
|
| 34. |
Name the gas liberated during process of photosynthesis |
|
Answer» Hope it helps you and follow me and mark me as a BRAINLIEST. |
|
| 35. |
18. On moving from left to right in a period of the periodic table the atomic number of the elementincreases, what happens to the size of atoms of elements on moving from left to right in aperiodA) IncreasesB) decreasesC) remains the sameD) First Increases then decreases |
|
Answer» Answer: B)Decreases Explanation: On moving from left to right in a specific PERIOD,the orbit remains in the molecules are same but the NUMBER of electrons in the activated orbit(last orbit) increases gradually.as the protons ALSO increases, the static attraction of electron and nucleus is more powerful in the right sided molecules than the left sided molecules in a certain period.as for that the last orbit come closer to nucleus and the size of molecule decreases when we GO right from left.(in case of any certain period and) |
|
| 36. |
State the pH at which enzymes function effectively.What is the name of this pH? |
|
Answer» In the same way that every ENZYME has an optimum TEMPERATURE, so each enzyme also has an optimum pH at which it works best. For example, trypsin and pepsin are both enzymes in the digestive system which break protein chains in the food into SMALLER BITS - either into smaller peptide chains or into individual amino acids. Pepsin works in the highly acidic conditions of the stomach. It has an optimum pH of about 1.5. On the other hand, trypsin works in the small intestine, PARTS of which have a pH of around 7.5. Trypsin's optimum pH is about 8. |
|
| 37. |
The pressure of 1:4 mixture of dioxygen and dinitrogen in a vessel is 1.5 atmospheres. what would be the partial pressure of dinitrogen in Nm-2? |
| Answer» | |
| 38. |
Write rection to bring about the following conversions aniline into p-nitroaniline |
|
Answer» hellohhhhehhwhwhhwywhgggwggggggywgwgwy |
|
| 39. |
16. The element which has the maximum number of valance electrons isA) NaB) PC) SID) AI |
Answer» maximum NUMBER of valance ELECTRONS....= PHOSPHORUS (P)#ANONYMOUS.....❤❤⚽⚽ |
|
| 40. |
Name the chemicals which help to maintain the pHof our blood constant. |
|
Answer» Answer: it depends that your blood is too ALKALINE or too acidic if your blood is too acidic you can use bases like patassium HYDROXIDE , aluminium hydroxide and those chemicals which is BASIC in nature or if your blood is too alkaline then you can use something which is acidic in nature like venegar, because presence of both bases as WELL as acid NEUTRALISE each other , so that the blood can be maintained. |
|
| 41. |
Disadvantages of olefins |
|
Answer» Olefin can be damaged by Friction – Even dragging a heavy piece of furniture across an olefin carpet can CAUSE permanent marks from the heat generated by friction. > LIKE polyester, EXTENDED exposure to oil-based soils may BECOME permanent. |
|
| 42. |
it is said that we can not divide atom than what are electorns, protons, and neutrons... please do not spem.... |
|
Answer» Answer: atom can't be divide into TWO parts, but it consists ELECTRONS, protons and NEUTRONS |
|
| 44. |
The vapour pressure of water is 12.3 kPa at 300 K. Calculate vapour pressureof 1 molal solution of a non-volatile solute in it |
|
Answer» Answer: The vapour pressure of water is 12.3 kPa at 300 K. We need to CALCULATE the vapour pressure of 1 molal solution of a non-volatile solute in it. 1000 g of water contains 1 MOLE of solute. The MOLAR mass of water is 18 g/mol. Number of moles of water = 18 1000
=55.56 mol Mole fraction of the solute in the solution is x= 1+55.56 1
=0.0177. The RELATIVE lowering in the vapour pressure is equal to the mole fraction of solute. p 0
p 0 −p
=x 12.3 12.3−p
=0.0177 ⇒p=12.08 Hence, the vapour pressure of the solution is 12.08 kPa. |
|
| 45. |
भारत जैसे विविधता वाले देश में लोकतंत्र क्यों जरूरी है |
|
Answer» भारत जैसे विविधता वाले देश में लोकतंत्र इसलिए जरूरी हो जाता हैm क्योंकि विविधता से भरे इस देश में को एकजुट रखने में लोकतंत्र की सबसे सार्थक और कारगर शासन व्यवस्था है। यदि भारत में लोकतंत्र नहीं होता तो विभिन्न भाषा, संस्कृति वाले विविधता से भरे इस देश में हर क्षेत्र में अलग-अलग शक्ति के केंद्र पैदा हो गए होते जो भाषा और संस्कृति के आधार पर इस देश की अखंडता को चुनौती बन सकते थे। भारत में लोकतंत्र कायम होने से देश की विविधता में एकता कायम हुई। लोकतंत्र ने विविधता से इस देश को एकता के सूत्र में बाँधे रखा है। ≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡ संबंधित कुछ अन्य प्रश्न—▼ लोकतांत्रिक देश संविधान क्यों अपनाते हैं? ═══════════════════════════════════════════ लोकतंत्र के मुख्य सिद्धांत क्या है ═══════════════════════════════════════════ सत्ता में साझेदारी कैसे लोकतंत्र से जुड़ा हुआ है ○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○ |
|
| 46. |
): Given the following reaction: Na2S2O3 + AgBr NaBr + Na3[Ag(S2O3)2]a. How many moles of Na2S2O3 are needed to react completely with 42.7 g of AgBr?b. What is the mass of NaBr that will be produced from 42.7 g of AgBr? |
|
Answer» Explanation: please MARK me as brilliant |
|
| 47. |
The vapour pressure of water is 12.3 kPa at 300 K. Calculate vapour pressureof 1 molal solution of a non-volatile solute in it.$Calculate the mass of a non-volatile solute in it |
|
Answer» Explanation: The VAPOUR pressure of WATER is 12.3 kPa at 300 K. Calculate vapour pressure of 1 MOLAL solution of a non-volatile solute in it. 1 molal solution means 1 mol of the solute is present in 1000 g of the SOLVENT (water). x2 = 1 / (1+55.56) = 0.0177. |
|
| 48. |
5 example of metal |
|
Answer» sodium aluminum gold silver MARK ME BRAINLIEST ANSWER PLEASE |
|
| 49. |
arrange the following in the increasing order of their electron affinity i) C, N, O ii) O, N , S iii) S, Cl, Ar iv) F, Cl, Br |
|
Answer» it the answer ...... |
|
| 50. |
the concentration w/w% of a 200g solution of common salt is 10% if 20g more water is mixed in it then its concentration becomes |
| Answer» | |