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. |
Determine transport number of Na+ from the following data : Concentration of NaCl solution = 1.000 N, concentration of indicator electrolyte CdCl2 = 0.80 N, strength of electricity = 0.0142 ampere, time taken in moving liquid boundary = 2000 sec. and volume displaced when boundary moved = 0.25 c. c. |
| Answer» | |
| 2. |
The solution having vapour pressure is(assume 100% ionisation of electrolytes)(a) IN KNO3 (b) IN Ba(NO3)2(c)1 N Al2(SO4)3 (d) IN Th(NO3)4 |
|
Answer» Answer: Van't Hoff factor =i For Ba(NO 3
)
,i=3; Ba+2NO 3 −
+ +Cl −
For Glucose, i=1 So HIGHER the van't Hoff factor, higher is the lowering of vapor pressure So Ba(NO 3
) 2
will have the highest lowering of vapor pressure. Option C is correct. |
|
| 3. |
16.What type of chemical reaction takesplace when1) Limestone is heated X).Mg ribbon is burnt in alr. |
|
Answer» Answer: 1. is Combustion reaction or ENDOTHERMIC reaction or DECOMPOSITION reaction 2. is Decomposition reaction or Endothermic reaction or Combustion reaction Explanation: all three types of REACTIONS are these |
|
| 4. |
4. Volume of H2 gas at 50°C is 200 mL. The gas is cooledand volume becomes 50% of the original volume.ate the-230What is the final temperature ? Pressure is constant. |
|
Answer» -111.5 Explanation: |
|
| 5. |
Which gas burns itself but does not support in burning?A. hydrogen sulfideB. sodium chlorideC. nitrous oxideD. carbon monoxide |
| Answer» | |
| 6. |
Draw a neat labelled diagram of sodium and carbon atom representing it’sa) subatomic particlesb) orbits or shells andc) nucleus |
|
Answer» you will SEE there |
|
| 7. |
The formula for ammonia is NH3 and that of glucose is C6H12O6. Writedown the constituent elements in each compound and the number of each elementpresent. |
|
Answer» Answer: |
|
| 8. |
All compounds are molecules but all molecules are not compoundsGive a reason for the following statements: |
|
Answer» Answer: All compounds are MOLECULES, but not all molecules are compounds. That is because a molecule can be made up of TWO atoms of the same kind, as when two oxygen atoms BIND together to MAKE an oxygen molecule. However, all compounds are made up of two or more DIFFERENT types of atoms. |
|
| 9. |
Balnce the following equation:ClO3^-1 ----------→Cl^-1 + ClO4^-1 |
|
Answer» SORRY I have not UNDERSTOOD the QYESTION |
|
| 10. |
16. Which property of metals is used formaking bells and strings of musicalinstruments like Sitar and Violin?(1Point)नकरताहयानतीSonorousnessMalleabilityDuctilityकोस्काConductivity |
|
Answer» SONOROUS........... |
|
| 11. |
Out of the following two coordination entities,which is chiral (optically active) ?(a) cis-[CrCl2(ox)2]3-(b) trans-[CrCl2 (ox)2]3- |
|
Answer»
|
|
| 12. |
Why is geometrical isomerism not possible intetrahedral complexes having different types of unidentateligands coordinated with the central metal ion ? |
|
Answer» Answer: Tetrahedral complexes do not show geometrical isomerism because the relative positions of the unidentate LIGANDS ATTACHED to the central METAL ATOM are the some with respect to each other. Coordination number of a metal ion is also equal to the total number of coordinate bonds present in a complex. hope this will be helpful to youplease FOLLOW me only if u like |
|
| 13. |
For combustion of carbon disulphide, CS2 + 3O2 = CO2 +2SO2, one mole of CS2 is same as ______(redox) equivalents of CS2.The answer is 12, Please explain in steps |
| Answer» | |
| 14. |
He1. At constant temperature, 400 mL of a gas is found toQuestions forhave a pressure of 740 mm. What will be the pressureof the gas if its volume (a) is doubled, (b) is halved? |
| Answer» | |
| 15. |
Which is correct for the reaction?P4 (s) + 3H2O (l) + 3OH− (aq) → PH3 (g) + 3H2PO2− (aq) |
| Answer» | |
| 16. |
A mixed oxide Feo.Cr2O3 is fused with sodiumcarbonate in the presence of air to form a yellow compound(X). On acidification, compound (X) gives an orangecompound (Y). Compound (Y) is a strong oxidising agent.Colour of aqueous solution of compound (Y) depends uponpH of the solution. Identify the compound X and Y. |
|
Answer» HOPE this ATTACHMENT HELPS you BUDDY |
|
| 17. |
Calculate the mass of bones urea (NHCONGHequired in making kg of ,0.25 molalaquesus solution.2.5 |
|
Answer» sysotsyos44689544........ |
|
| 18. |
MySaman tatha aur Saman Torrent ko varg Samay graph dwara spasht kijiye Ek Saman tatha aur Samantha Warren ko wave Samay graph dwara spasht kijiye |
|
Answer» question in English i CANT UNDERSTAND HINDHI |
|
| 19. |
0.138185. What will be the con" of citric acidbe if 25 ml of citric acid sol" istitrated with 28 .12 ml of0.1718 N KOH |
|
Answer» Answer: PLEASE make me as Brainliests nobody MARK me please U can mark Brainliests |
|
| 20. |
What do you observe when:1) dilute hydrochloric acid is added to copper(II) sulphide2) sodium carbonate solution is mixed with zinc nitrate solution |
|
Answer» Answer: following will be observed Explanation: when we will hydrochloric ACID with copper SULPHATE solution it will FORM hydrogen sulphide and a BLUE solution of copper chloride when will mix sodium carbonate solution with zinc nitrate solution it will form sodium nitrate solution and a precipitate of zinc carbonate |
|
| 21. |
The following skeletal oxidation-reduction reaction occurs under acidic conditions. Write the balanced REDUCTION half reaction.Fe + SO42- Fe2+ + SO2 |
|
Answer» Answer: An example is given below of the reaction of iron(III) sulfate with magnesium. Unbalanced reaction: Mg(s) + Fe2(SO4)3(aq) → Fe(s) + MGSO4(aq) This reaction is split into two half-reactions, one that involves oxidation and one that involves reduction. Reduction: Fe3+(aq) + 3e– → Fe(s) Oxidation: Mg(s) → Mg2+(aq) + 2e– This pair of half-reactions can be balanced by ENSURING that both have the same NUMBER of electrons. To do this, multiply the oxidation half-reaction by 3 and the reduction half-reaction by 2, so that each half-reaction has 6e–. 2 Fe3+(aq) + 6e– → 2 Fe(s) 3 Mg(s) → 3 Mg2+(aq) + 6e– Adding these two half reactions TOGETHER gives the balanced equation: 2 Fe3+(aq) + 3 Mg(s) → 2 Fe(s) + 3 Mg2+(aq) Notice that the sulfate ion (SO42-) is ignored. This is because it does not take part in the reaction; it is a spectator ion. |
|
| 22. |
ما(a) when twoaqueous colourless solution ofX and Y salt are mixed, it is bound that thereis instant formation of two new salts one iswhite precipitate of Z and other one is Bwhich remain in solution. The compound B ismajor ingredients of salt obtained from sea.And salt y can be formedby acid base reaction of the base having some metal containingin B and Sulphuric acidi. Identify x,y,z,B i. Write the reaction between X and Y. |
|
Answer» SORRY....................... ..... ............. |
|
| 23. |
A compound contain 80% carbon and 20 % hydrogen. what is the empirical formula of compoundplz help meits urgent |
|
Answer» your answer should be |
|
| 24. |
0.2Potassium metal crystallizes in the body-centered cubic structure. The number of atoms per unitcell is equal to(A) one(B) tivo(C) three(D) four |
|
Answer» Answer:(b) two Explanation:if you LIKED my answer PLEASE mark me as BRAINLIEST |
|
| 25. |
The similarities of Hydrogen that resembles with those of halogens are____________ A. Electronic configuration of hydrogen B. Hydrogen exists as a diatomic molecule C. Combines with metals and non-metals to form covalent compounds D. Both (B) and (C)The similarities of Hydrogen that resembles with those of halogens are____________ A. Electronic configuration of hydrogenB. Hydrogen exists as a diatomic molecule C. Combines with metals and non-metals to form covalent compounds D. Both (B) and (C) |
|
Answer» Answer: D. Both (B) and (C)
Explanation: |
|
| 26. |
Which most likely represents the process of dissolving carbon dioxide in soda? PLZ HELP WILL GIVE BRAIN IF RIGHTA: increased temperature to increase solubilityB: increased pressure to increase solubilityCD decreased agitation to decrease solubilityD: decreased pressure to increase solubility |
|
Answer» I THINK it's D one. FOLLOW+5likes= follow |
|
| 27. |
Classifications of juice is bone by.............. .Process1) Sulphitation 2) Hydrolysis 3) Oxidation 4) none of these |
|
Answer» The classification of juice is DONE by the Sulphitation Process. Sulphitation Process
|
|
| 28. |
Which most likely represents the process of dissolving carbon dioxide in soda?A: increased temperature to increase solubilityB: increased pressure to increase solubilityCD decreased agitation to decrease solubilityD: decreased pressure to increase solubility |
|
Answer» Answer: In Stage 1 of his lab, Gunther adds 20 mg of solute into a SOLUTION. He stirs it and it completely dissolves. In Stage 2, he adds 20 mg more of solute and stirs, but this TIME, some settles out. In Stage 3, he then HEATS his solution, adds 20 mg more,and the solute completely dissolves. Which best explains his EXPERIMENT? Stage 1 demonstrated an unsaturated solution, Stage 2 demonstrated a SATURATED solution, and Stage 3 demonstrated a supersaturated solution. |
|
| 29. |
State that whether the reaction is feasible or not, if feasible complete theequationa. MgSO4 + Cu ?b. Cucl2 + Fe ?c. FeSO4 + Zn ? hi |
|
Answer» FEASIBLE . not . feasible |
|
| 30. |
An unknown inorganic compound (X) gave thefollowing reactions:(1) The compound (X) on heating gave a residue, oxygenand oxide of nitrogen.(ii) An aqueous solution of compound (X) on addition totap water gave a turbidity which did not dissolve in HNO3. (iii) The turbidity dissolved in NH OH.Identify the compound (x) and give equations for thereactions (1), (ii) and (ii). |
|
Answer» HOPE this ATTACHMENT HELPS you BUDDY.... |
|
| 31. |
In given equation, how many atoms doeschlorine have? 2FeCl 3 -------> 2FeCl 2 + Cl 2.A. 3B. 2C. 6D. 4 |
|
Answer» Answer is 4 Because in RHS it is balanced with 4 atoms |
|
| 32. |
When a crystalline compound (A) is heatedand conc. H 2 SO 4, a reddish brown gas (B) is produced.When the gas (B) is passed in caustic sodasolution, the solution becomes yellow. When CH 3 COOHand lead acetate is added in yellow coloured solution, yellowprecipitate (C) is obtained. Identify the compound A, B andC.Write equations for the reactions involved. |
|
Answer» HOPE the ATTACHMENTS HELP you BUDDY.... |
|
| 33. |
Solvent evaporation method is which type of micro encapsulatipn techniqiea. physicalb. chemicalc. physico chemicald. all of the above |
|
Answer» SOLVENT EVAPORATION METHOD is which type of micro encapsulatipn techniqie is CHEMICAL |
|
| 34. |
In the given structure, write:a)Chem.formula:______b) Metal:_______ , Non- metal:______c) Anion:_______ , Cation: _____ |
|
Answer»
b) METAL : sodium non metal : OXYGEN cation : oxygen
|
|
| 35. |
What are geometrical isomers? name two geometrical isomers of 1.2 dicholoropane and 0 chloropentane. |
|
Answer» Geometric Isomers: A form of isomerism displayed by unsaturated compounds or by ring compounds, where ROTATION about a carbon bond is restricted, as in CIS and trans configurations.
CH3CHClCH2Cl, 1,2-dichloropropane its 1- Chloropentane- Molecular FORMULA, C5H11Cl
|
|
| 36. |
One mark questions:1) Write an expression for torque acting on a barmagnet of dipole moment 'm' is placed in auniform magnetic field 'B'. |
|
Answer» prdddygg Explanation: shkdjhckhfhhhdxoh |
|
| 37. |
Hydrogen peroxide in aqueous solution decomposes on warming to give oxygen according to the equation2H₂O₂(aq) →2H₂O(l)+O₂(g)Under conditions where 1 mole of gas occupies 24dm³.100cm³ of XM solution of H₂O₂ produces 3dm³ of O₂pls answer this question........pls no spam answers |
|
Answer» CONCLUSION of OBJECTIVES BOOKING KEEPING system ☺️★‡”’::;!! |
|
| 38. |
Name the methods you would use to separate the following mixture in laboratory –A. Camphor from saltB. Cream from milkC. Fractions of petroleumD. RBCs from blood(2) |
|
Answer» A. Sublimation B.Centrifugation C.Filtering D.Centrifugation |
|
| 39. |
Q. 2. Write the balanced equations for the following chemical reactions :(0) Hydrogen + Chlorine+ Chlorine → Hydrogen chloride(ii) Sodium + Water Sodium hydroxide + Hydrogen(iii) Barium chloride + Aluminium sulphate - Barium sulphate + AlumThe balanced equations are written for the symbol equations and not for wo |
|
Answer» Explanation: 1) H2 (G) + cl2 (g) - 2HCL (g) 2) 2 NA +2H2O - 2NaoH + H2 3) 3Bacl + AL2 ( SO)4 - 3BaSo4 + 2Alcl3 |
|
| 40. |
Calculate the number of molecules in a sample ofan ideal gas whose volume is 0.45 L at 67°C and0.76 bar pressure. |
|
Answer» Answer: Explanation:
→ First convert the temperature from °C to K 67° C = 67 + 273.15 = 340.15 K → Now convert the pressure from bar to atm 0.76 bar = 0.75 atm → Now we have to find the number of moles of gas → By ideal gas equation we know that, PV = n R T where R is the gas constant and the value of R = 0.0821 L atm mol⁻¹ K⁻¹ → Substitute the given datas 0.75 atm × 0.45 L = n × 0.0821 L atm mol⁻¹ K⁻¹ × 340.15 K n = (0.3375/27.926) mol n = 0.012 mol → Hence the number of moles of gas is 0.012 moles. → Now the number of molecules of gas is given by Number of molecules of gas = number of moles × Avogadro's number where Avogadro's number = 6.022 × 10²³ → SUBSTITUTING the VALUES, Number of molecules = 0.012 × 6.022 × 10 ²³ Number of molecules = 0.072 × 10²³ Number of molecules = 7.2 × 10²¹ molecules → The ideal gas equation is given by PV = n R T where P is the pressure, V = volume, n = number of moles, R = gas constant, T = temperature
|
|
| 41. |
Ques1. Fill in the blanks:1-__________ are the changes in which we get back to the initial substance by reversing the action.2-Changes that are not desirable to us are called _________--3-A ________ change is temporary are reversible.4-There is an exchange of___________ during a chemical change.5-A __________ refers to the transformation of a substance from one form to another. |
|
Answer» Answer: FIRST answer is Max SECOND answer is Lumax THIRD answer is Max fourth answer is a a EXPLANATION V answer is a transformation |
|
| 42. |
An aqueous solution of inorganic compound00 gives following reactions:(I)with an aqueous solution of bariun chloride aprecipitate insoluble in dil. HCl is obtained.(ii) Addition of access of Ky gives a brown ppt, which turnswhite on addition of excess of hypo.(iii) With an aqueous solution of K [Fe(CN).), a chocolatecoloured precipitate is obtainedIdentify (X) and give equations for the reaction (I),(ii) and(iii) |
|
Answer» Answer: (i) : Copper sulphate reacts with barium chloride to form white PRECIPITATE of barium sulphate. CuSO 4
+BaCL 2
⟶BaSO 4
(whiteppt)+CuCl 2
White precipitate of BaSO 4
is insoluble in dilute HCL. (II) : 2CuSO 4
+4KI⟶Cu 2
I 2
↓(browncolor)+I 2
+2K 2
SO 4
It TURNS white on addition of excess of hypo. (iii) : Copper sulphate reacts with potassium ferrocyanide to obtain chocolate coloured precipitate of cupric ferrocyanide. 2CuSO 4
+K 4
[Fe(CN) 6
]⟶Cu 2
[Fe(CN) 6
](chocolatecolouredprecipitate)+2K 2
SO 4 please answer my question |
|
| 43. |
2.6. When you mix solutions of lead (II) nitrate and potassium iodide,(1) What is the colour of the precipitate formed ? Name the compound involved(ii) Write a balanced chemical equation for the reaction(iii) Is this a double displacement reaction ?rate is yellow in colour. The compound is lead (II) iodide with che |
|
Answer» Explanation: ANS. The wind symbolises the uncontrollable and raw power of nature. The wind god symbolises strength and steadfastness. WEAKLINGS who are weak in the mind and body are swept away by the mighty power of the wind. Only those who are blessed with steadfast minds and hearts survive in the bitter struggle of life. The poet gives a broader message. Whatever we do or think must stand on the foundations of strength and power. Only strong minds and bodies can face the anger of the wind and challenges of life. We can befriend the god of wind by building strong homes and doors. We can ALSO win his favour by firming the body and MAKING the heart steadfast. |
|
| 44. |
Ques3. Answer the following question:Q1-Give any two examples of chemical change.Q2-What do you mean by reversible changes?Q3-Define sublimation with an example.Q4-Differentiate between the periodic and non- periodic changes.Q5-Differentiate between the desirable and undesirable changes |
|
Answer» Answer: |
|
| 45. |
1.2. Match the following bases with suitable phrases:1. Slaked lime e)(a) antacid2. Magnesia a)(b) manufacture of soap3. Sodium hydroxide b)(c) used to remove grease stains4. Ammonium hydroxide )(d) amphoteric oxide5. Zinc oxide d)(e) softening of hard water |
|
Answer» Answer: |
|
| 46. |
Atomic mass of some elements are given [Mg=240=16]a) how many atoms are these in 120g Mg?b) find the mass of A×6.022×10²³ oxygen atoms |
|
Answer» A) no:of MOLES=120/24=5 |
|
| 47. |
Which one is positive oxjdation stateNH2OHNH3OxygenVanadium |
|
Answer» Answer: //please .. MARK .. as .... brainlist../// Explanation: The sum of the oxidation states of all the atoms in an ion is equal to the charge on the ion. The more electronegative ELEMENT in a substance is given a NEGATIVE oxidation state. The less electronegative ONE is given a positive oxidation state. |
|
| 48. |
The molarity of orthophosphoric acid having purity of 70% byweight and specific gravity 1.54 would be |
|
Answer» Answer: 11M Explanation: The MOLARITY of orthophosphoric acid having PURITY of 70% by WEIGHT and SPECIFIC gravity 1.54 would be. 11M. pls mark me as brainliest |
|
| 49. |
2. Mahmud of Ghazni attacked India mainly-(a) to establish his empire in India.(b) to spread Islam in India.(c) to take away the famous artisans from India.(d) to plunder the wealth of India. |
|
Answer» C) ................. .......... . ....... |
|
| 50. |
Atomic mass of some elements are given(Mg=24,O=16)a. how many atoms are there in 120g Mg b. Find the mass of 4×6.022×10^23 oxygen atoms |
|
Answer» a. no. of ATOMS = 30.1×10^23 b. 6.402×10^47 Explanation: MARK ME AS BRAINLIEST |
|