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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. |
What do you mean by the term separation of mixture |
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Answer» A SEPARATION process is a method that converts a MIXTURE or solution of CHEMICAL substances into two or more distinct product mixtures.In some cases, a separation MAY fully divide the mixture into pure CONSTITUENTS. |
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| 2. |
two elements X (at wt=75) and Y (at wt=16) combines to give a compound having 75.8% of X The formula of the compound is |
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Answer» bro you are ASKING FORMULA or other THINGS Explanation: plzz confirm your qquetion |
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| 3. |
As+5Cl ——>. Write the product |
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Answer» HEY MATE your ANSWER is here☺️☺️❤️❤️ As + 5CL ------→ Ascl5. Hope it HELPS you✌️✌️ |
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| 4. |
Identify oxidation and reducing agent in following reactios(a)Zn+Hcl-------- ZnCl+ H2(b)ZnO+C--------Zn+Co(c)MnO+4Hcl---MnCl2+Cl2+2H2O |
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Answer» Answer: c . MNO is reducing and HCL is oxidized a. zinc is oxidized and HYDROGEN is reduced b. co is oxidized and ZNO is reduced HOPE it helps PLS mark as brainliest answer follow me on brainly |
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| 5. |
The element ABCDE has their atomic number 7 10 11 19 20 respectively(a) which element has more electronegativity (b) name the group c and d(c) name 2 elements belong to same group |
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Answer» we don't no this answer SORRY |
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| 6. |
How to determine the correct answers from significant figures ? |
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Answer» Explanation: OBSERVE it CORRECTLY then you can DETERMINE the correct answers from significant figures..... Hope its may HELPFUL to you |
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| 8. |
Is there an independent existance of oxidation and reduction reactions |
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Answer» no................. |
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| 10. |
If 2g of common salt is dissolved in water to make 250ml of solution , calculate concentration of solution. |
Answer» Answer:0.008 g / mL Explanation:We have : Given mass = 2 g Volume = 250 mL We are asked to find CONCENTRATION of solution! We know : Concentration of solution = Mass / Volume i.e. C = m / V C = 2 / 250 g / mL C = 0.008 g / mL Therefore , we GET required answer.Read more : Calculate the total number of moles of atoms in 980 gm of H₂SO₄. |
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| 11. |
Explain the formation of becl2 by vbt |
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Answer» Answer: Explanation: During the formation of BeCl2, beryllium atom bonds with TWO chlorine atoms via single covalent bonds. The number of ELECTRON pairs around the central atom will be two. No LONE pair is found in the MOLECULE. If we analyze this information then we can conclude that BeCl2 has sp hybridization. Name of the Molecule: Beryllium Dichloride Hybridization TYPE: sp Geometry: Linear Bond Angle: 1800 |
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| 12. |
What happen when metal acids react with acid |
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Answer» Answer: When METAL reacts with acid it FORMS a salt which is basic in nature and releases hydrogen GAS. Magnesium and hydrochloric acid reacts to give the salt magnesium chloride and hydrogen gas. ... Metals react with acids to produce a salt and hydrogen gas. |
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| 13. |
OfWhich(a) N₂theiss afollowind(C)(a)compound 216)NaClSand |
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| 14. |
What happen when metal sulphate react with an acid |
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Answer» Answer: When an acid reacts with metal, a SALT and hydrogen are PRODUCED: acid + metal → salt + hydrogen An EXAMPLE: nitric acid + calcium → calcium nitrate + hydrogen The salt that is produced DEPENDS upon which acid and which metal react. |
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| 15. |
2 sulphide is mixture |
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Answer» Answer: matlab nahi SAMAJH aaya Explanation: |
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| 16. |
Give electronic concept about redox reaction with one example of each |
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Answer» CuO+H2-----------Cu+H2O+heat |
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| 17. |
2 sulphide is a mixture or compound |
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Answer» Mixture Explanation: Its a mixture Its is powderely MIXED |
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| 18. |
As the electro positivity increases metallic natureI will mark as brainlist plz |
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Answer» An element is said to possess more metallic character if it is more ELECTROPOSITIVE. In a PERIOD electropositivity decreases because of increase in IONIZATION energy along a period. While in a group electropositivity increases because ionization energy decreases when we MOVE down in a group. |
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| 19. |
which of the following has smallest no. of molecules (a) 11.22 of o^2 at NTP (b) 8.0 g of o^2 (c) 0.1 mole of o^2 (d) 2.24×10^4 ml of o^2 |
Answer» here is the answer.the correct option is D as , 2.24 × 10⁴ ml of O2 = 22.4 × 10⁴ ml of O2 now :- 22.4 × 10³ml = 22.4Litre we know that:- 22.4 l = 1 mol so , no . of molecules = 1× 6.023×10²³ . hope it helps you. ☺️☺️☺️☺️☺️☺️ |
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| 20. |
As the electro positivity increases metallic nature |
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Answer» Yes electro POSITIVITY increase the mettalic nature because NUMBER of shells increase and SHIELDING effect also INCREASES the ATOMIC radius also increas from top to bottom in group |
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| 21. |
Certain element X’exist as two isotopes of Atomic mass 20.5 and 21.5 u as 50% abundance each.The atomic mass of X’ should be(a) 20.5 u(b) 21.50(c)42u(d)2lu |
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| 22. |
2. Atomic number of uranium is 92. Its mass number is 238u. The number of neutrons present in oneatom of uranium is(a) 146(b) 136(c) 92(d) 238 |
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Answer» a. 146 Explanation: ATOMIC no. = no. of PROTONS = 92 mass no. = no. of protons + no. of neutrons 238 = 92 + n 238-92 =n so, n=146 |
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| 23. |
in an electrolytic cell a 2.2A current flows through 500mL of a o.40 M Cu 2+ solution for 20 minutes. Determine the concentration of Cu 2+ remaining in a colution, assuming the solution volume is constant. |
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Answer» Let the initial velocity of the BODY be u m/s; and the constsnt acceleration be a m/s². Then DISPLACEMET (distance covered) of the body after t second is given by s = u t + ½ a t² ———————————-(1) The body covers 20 m in 2s and 80 m in 4 s. 20 = u×2 + ½ a 2²; => 20 = 2 u + 2 a u + a = 10 —————————————(2) 80 = u×4 + ½ a 4²; => 80 = 4 u + 8 a; this gives, u + 2 a = 20 ——————————————(3) Solving (2) and (3) for u and a we get u = 0 m/s and a = 10 m/s² ————————(4) To obtain the distance covered in the next 4s we need to FIND the velocity at the beginning of this interval USING, v = u + a t => v = 0 m/s + 1... Continue Reading RELATED QUESTIONS (MORE ANSWERS BELOW) |
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| 24. |
What is cold combination ? Explain |
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Answer» This combination medication is USED to temporarily treat symptoms caused by the common COLD, flu, allergies, or other BREATHING illnesses (such as sinusitis, bronchitis). Dextromethorphan is a cough suppressant that affects a certain part of the brain, reducing the urge to cough. HOPE IT HELPS YOU ❤ MARK AS BRAINLIST ANSWER ❤ FOLLOW ME ❤ |
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| 25. |
Write a short note on phosphate fertilisers. |
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Answer» Answer: Phosphate Fertilizers. Phosphorus is the eleventh most abundant element in EARTH. If soils are deficient in phosphorus, FOOD production becomes restricted, unless the NUTRIENT is added in the FORM of fertilizers. HENCE, to increase food production, an adequate amount of phosphorus is required. |
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| 26. |
Define roults law and their applications,? |
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Answer» Raoult's law states that a solvent's partial vapour pressure in a solution (or mixture) is EQUAL or identical to the vapour pressure of the pure solvent multiplied by its mole fraction in the solution. ... Because A and B are both volatile, there WOULD be both particles of A and B in the vapour phase. PLEASE mark the BRAINLIEST please please please as I need only 2 brainliest answers to reach the next LEVEL please |
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| 27. |
Which one of the elements of group 15 forms the largest number of oxides |
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Answer» HE LITIUM BERELIUM BORON CARBON NITROGEN OXYGEN |
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| 28. |
The number of oxygen atoms bonded to any one ofthe phosphorous atom in P4O6is(2)3(3) 5(4) 6(1) 4 |
Answer» Oxygen atom=6Hope it HELPS you STAY home Stay safe Mark BRAINLIEST |
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| 29. |
Which one of Beco3, Mgco3 and caco3 is thermally the largest stable |
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| 30. |
What is the Total number of electrons present in 1 mol of N ions ? |
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Answer» Answer: bhai gyada points diya karoo Explanation: 225 ANS not sure PLZZ chek this ans and plzz plzz plzz MARK me BRAINLIEST |
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| 31. |
8. The solubility product of a salt M,X, is 1.08 * 10->If the solubility of another sait M X is twice themolar solubility of M.X, then the solubility productof M.X is(1)32 * 10-14(2) 9.16 * 10-15(3) 4.58 x 10(4) 3.2 * 10-15 |
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| 32. |
StandardelectrodeElectrode potential andpotential |
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Answer» MARK my ANS as BRAINLIEST PLZZZ |
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| 33. |
69. For an ideal binary liquid solution with PX > Pwhich relation is correct if X, is mole fraction of A inliquid phase and Y. is mole fraction of A in vapourphase?(1) YAxb(3) ya/yb>xa/xb(4) ya/yb |
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Answer» P A ′ =P A 0 ⋅X A =P M ⋅Y A
P B ′ =P B 0 ⋅X B =P M ⋅Y B
∴ P B 0
P A 0
⋅ X B
X A
= Y B
Y A
∵ P B 0
P A 0
>1∴ X B
X A
< Y B
Y A
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| 34. |
What are the charactersticks of atoms?(5points) |
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Answer» Answer: ATOMS consist of THREE basic particles: protons, electrons, and neutrons. 3......consist the neutrons (no charge). 5....the NUMBER of protons and electrons are equal, that atom is ELECTRICALLY neutral.Feb 28, 2019 |
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| 35. |
Deffine maximum boiling azeotropes. |
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Answer» Maximum BOILING aeotropes are obtained from a solution at a particular COMPOSITION showing large negative deviation from Raoult's law . for example .. |
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| 36. |
Which of the following has more number of atoms?(a) 1 g rhombic sulphur Se(c) 1g S6 vapour(b)lg m S, vapour(d)all the above |
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| 37. |
The compound that neither forms semicarbazone nor oxime is |
Answer» The COMPOUND that neither forms semicarbazone nor oxime is. Solution : It is most carbonyl compound. It is a substituted ACID amide. |
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| 38. |
Select the factors that stimulate the pyruvate dehydrogenase complex.high concentration of NADHhigh ATP levels activating the regulatory kinaseincrease in Ca2+ concentrationdephosphorylation of E1 (pyruvate dehydrogenase)high concentration of acetyl‑CoA |
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| 39. |
Easiest way to learn pakaging efficiency of chemistry solid state |
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Answer» Packing efficiency = The PACKING efficiency or Capacity is the percentage of volume of the CONSTITUENT particles arranged in a UNIT cell
In mathematical terms it can be WRITTEN as , |
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| 40. |
What salt is formed from HNO3 Mg(OH)2 |
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Answer» Explanation: When two moles of NITRIC acid REACT with one mole of MAGNESIUM hydroxide, the salt formed is magnesium nitrate with water. |
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| 41. |
What is the parent acid for NaBr? |
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Answer» Explanation: SODIUM chloride, which is obtained by neutralization of hydrochloric ACID and sodium hydroxide, is a neutral salt. Neutralization of any strong acid with a strong BASE ALWAYS gives a neutral salt. |
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| 43. |
What is the relationship among reaction rate, effective particle collisions, and reactant concentration? How do these factors affect chemical equilibrium? |
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| 44. |
Prediction If you start with only A and B, when will C and D be produced the fastest? How does this relate to concentration?A + B ⇌ C + D |
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Answer» it MEANS A+B are SIMILAR to C+D hope you UNDERSTAND it |
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| 45. |
Write a balanced chemical equation for the reaction of gaseous nitrogen dioxide with hydrogen gas to form gaseous ammonia and liquid water. |
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Answer» Explanation: NO2+H2 --> NH3 + H20 By balancing it we GET |
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| 46. |
0.09 mol KBrfind the grams |
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Answer» Answer: 10.710207 Explanation: 1 GRAM have 0.0084031989297686 |
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| 47. |
What is valency of HCL |
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Answer» Answer: The OVERALL valency (oxidation NUMBER) of HCL is 0 because that is the overall CHARGE. CL- has a -1 valency meaning that Hydrogen is in the +1 oxidation state . |
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| 48. |
0.711 mol of I2 find the grams |
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Answer» molar mass of I2 = 126.9*2= 253.8 number of moles = 0.711 mass =? m= m.m * N m= 253.8* 0.711 m= 180.4518 G |
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| 49. |
What is the overall charge for sulfate trioxide |
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Answer» Answer: The Oxidation states in SO3(g) are: SULFUR (+6) & Oxygen (-2), because SO3(g) has no charge. However in (SO3)2 - (aq) the Oxidation states are: Sulfur (+4) & Oxygen (-2). Don't get the two confused, they may both be WRITTEN without the charge, but if SO3 is (aq) it will have a charge of -2 |
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