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. |
Mention in tabular form any two differences between heterogeneous and homogeneous mixtures. |
|
Answer» ONG>Explanation: MARK me BRAINLIEST PLEASE |
|
| 2. |
3) Calculate the amount ofCO2 produced by the combustionof 24 grams of Methane. |
|
Answer» Answer : Mass of methane = 24g We have to FIND the amount of CO₂ produced by the COMBUSTION of given amount of methane ★ Balanced chemical reaction :
Stoichiometry deals with the calculation of masses of the reactants and the products involved in a chemical reaction. It is clear from the reaction that 1 MOLE (16g) of methane GIVES 1 mole (44G) of carbon dioxide at STP. Hence, 24g of methane will give = (?)
Therefore, 66g of carbon dioxide will be produced by the complete combustion of 24g of methane. Cheers! |
|
| 3. |
A metal which reacts with concentrated alkali to give hydrogen |
|
Answer» ONG>ANSWER: IT'S FALSE AS METALS ARE ALKALINE IN NATURE . SO ALKALI AND ALKALI CANNOT REACT EACH OTHER MARK THIS IS AS BRAINLIEST |
|
| 4. |
Write the chemical symbols of two elements which have got their name from the names of the elements in Latin. |
|
Answer» ONG>ANSWER: THE ANSWER FOR UR QUESTION IS COPPER AND IRON |
|
| 5. |
In the laboratory preparation of hydrogen , silver nitrate solution is used to remove the impurity |
| Answer» ONG>ANSWER: | |
| 6. |
Among the following species, identify the isostructural pairs: NF₃, NO₃⁻, BF₃, H₃O⁺, HN₃ options are 1-[NF₃, NO₃⁻] and [BF₃, H₃O⁺] 2-[NF₃, HN₃] and [NO₃⁻, BF₃] 3-[NF₃, H₃O⁺] and [NO₃⁻, BF₃] 4-[NF₃, H₃O⁺] and [HN₃, BF₃] |
|
Answer» Solution:- Isostructural species are those which are in geometry as WELL as hybridization (a) NF 3 Number of lone pairs = 1 No of bond pairs = 3 Hybridization = sp 3 Geometry = Tetrahedral ( Trigonal pyramidal) (b) NO 3- Number of lone pairs = 0 No of bond pairs = 3 ( only sigma BONDS must be counted ) Hybridization = sp 2 Geometry = Trigonal planar (C) B F 3 Number of lone pairs = 0 No of bond pairs = 3 Hybridization = sp 2 Geometry = Trigonal planar (d ) H 3 O + Number of lone pairs = 1 No of bond pairs = 3 Hybridization = sp 3 Geometry = Tetrahedral ( Trigonal pyramidal)
( E ) HN3 The central N ATOM is sp hybridised and the other two are sp 2 hybridised Hybridization = sp Geometry = linear Refer the attachment for its structure Answer:-3 -[NF₃, H₃O⁺] and [NO₃⁻, BF₃]
|
|
| 7. |
Suggest a list of metals that are extracted electrolycally |
|
Answer» ONG>EXPLANATION: i don't UNDERSTAND QUESTION.... |
|
| 8. |
Two binary solutions have the same molaritywhich one of the following is true |
|
Answer» ONG>Answer: where is the question plz MARK me as BRAINIEST and I will give U 50 POINTS in the next question |
|
| 9. |
Which is not a mixture :- a) soap solution b) starch soultion c) coal d) sodium chloride |
| Answer» ONG>ANSWER: | |
| 10. |
the reaction between led nitrate and potassium iodide solutions is an example for what type of chemical reaction, Explain. write the balanced chemical equation for this reaction |
|
Answer» 2> ↪___________❤_________↪THE REACTION BETWEEN LED NITRATE AND POTASSIUM IODIDE ARE COMBINED AND UNDER GO A DOUBLE REPLACEMENT Reaction.NAME OF REACTION : DOUBLE REPLACEMENT REACTION .Lead nitrate react with potassium iodide to form Lead iodide and potassium nitrate .PB(NO3)2 + 2KL + Pbl2 + 2 KNO3.#ANONYMOUS❤ |
|
| 11. |
Element B has Z=17. The number of covalent bonds in a molecule of B2 is |
|
Answer» > atomic confirugation :2,8,7 valence ELECTRON- 1 so covalent BOND is 1 It is a SATURATED bond
|
|
| 12. |
On adding dilute "Copper Oxide"a blue-green coloured solution is formed. i) What is the "blue -green" colour of the solution due to? ii) Write the chemical equation involved in the reaction . iii) Why is " Copper Oxide" considered as a " base"? |
| Answer» please follow me please | |
| 14. |
How many covalent bonds does sulphur have ? |
|
Answer» ong>Answer: 2 Explanation: This is the ground state of sulphur. To form COVALENT bond, electrons must be shared. As it has 2 valence electrons, it can form 2 covalent BONDS, just like oxygen. EG thiols (Me-SH) But, there is a twist. Sulphur has d ORBITALS which oxygen does not have. So it TAKES advantage of it and forms this. |
|
| 15. |
Foam the given data set determine angula dispersionby the prism and dispesivepo co or ofits material foo extreme colocos& URE 1062 , rev=1066SR=103 |
|
Answer» ffjfjfkfkdkdkdkdkdkiririfkfkfjxjxjcjcfg f ffkfkfkfg g gf f f g h yy syoee9epe e r ofdd ed doodled drrpdpd d d dFoam the GIVEN data SET determine angula dispersion by the prism and dispesive po co or of its material foo EXTREME colocos & URE 1062 , rev=1066 SR=103 d ddppddp |
|
| 17. |
What is the formula charges. give its formula? |
|
Answer» The S I unit of charge is coulomb and EQUAL to AROUND 6.242×10 to the POWER 18 formula Q=l.t |
|
| 18. |
Calculate the mass percentage of atoms present in C2H5 OH |
|
Answer» ONG>ANSWER: ...................................................... |
|
| 19. |
Whad is Bromination of aniline♡ give equation |
|
Answer» ong>ANSWER: BENZENAMINE (Aniline) reacts with bromine water at room TEMPERATURE to GIVE a white precipitate of 2,4,6-tribromoaniline. |
|
| 20. |
(๑˙❥˙๑)(๑˙❥˙๑)Good morning guys..........what is metal or non metal???(๑˙❥˙๑)(๑˙❥˙๑)(๑˙❥˙๑)(๑˙❥˙๑) |
| Answer» ONG>Good morning sis/bro..... | |
| 21. |
The absolute temperature value corresponding to 75 degree celsius is |
| Answer» ONG>EXPLANATION: | |
| 22. |
2.T-Molecular orbital in pyrrole is formed by the ..........of carbon and nitrogaatoms. |
|
Answer» ong>Answer: 4 of CORBON and nitrogen atoms |
|
| 23. |
Which among these have highest gain enthalpy 1- hydrogen 2-sodium 3-oxygen 4- neon |
| Answer» ONG>ANSWER: | |
| 24. |
100 cm3 of a gas at 27 degree Celcius is cooled to 20 degree Celcius at constant pressure. Calculate the volume of gas at 20Celcius. |
|
Answer» ong>Answer: V1 = 80ml P1 = 100cm V2 =160ml P2 = 740 mm P1V1 = P2V2 P2 = P1V1/V2 = 100 X 80 = 50 CM of Hg 160 Explanation: PLEASE mark as brilliantist |
|
| 25. |
A metal which cannot be used for the preparation of hydrogen using dilute acids |
|
Answer» ong>ANSWER: A metal which cannot be used for the preparation of hydrogen using DILUTE acids is copper. Explanation: As copper is LESS reactive than hydrogen. |
|
| 26. |
What are some other ways to minimize the usage of polymers |
|
Answer» ONG>ANSWER: reuse plastic material encourage to not to throw away plastic THING, reuse them and give it to the people who can use them.reduse the usage of plastic in alternative to usage of plastic bag,use paper BAGS which can be recycle EASILY and also eco friendly. Explanation: Hope so it will help you and plz follow me |
|
| 27. |
Calculate Ea for this reaction and rate constant if its half-life period be 300 minutes. |
|
Answer» ONG>ANSWER: dddddbbcccxxcxxxxxx vvhgxvndstujcsdjgxbgdd Explanation: vvcgmvdgn dgjcdgbcdhhzbbvfvbxgkchvxfhvxds |
|
| 29. |
An element X has 20 neutrons, 17 protons, and 17 electrons. Its mass number is |
|
Answer» ong>Answer: |
|
| 30. |
A Current of s Amperes is passed through acidifled water for 30 min then calculate thesette weight of H2O, deposited at catrode andanode and volume of o2 plz answer this |
|
Answer» ong>Answer: A current of 0.5 ampere is PASSED through acidulated WATER for 30 minutes calculate weight of o2 evolved. 2. See answers. Log in to ... Explanation:At Anode: 4OH- =2H2O +O2 +4e-. 4*96500 C releases O2 =32gram. then,. 1C release 32/4*96500 ... What is the volume needed to make 2. 5l of 0.25M MARK me as brainliest.... |
|
| 32. |
Explain the manufacture of washing soda with the help of a neat and labelled diagram. |
|
Answer» ong>Answer: In scientific TERM I can explain you When we ADD 10.H20 in Sodium Carbonate then Ca2C03.10H20 is FORMED which is WASHING soda |
|
| 33. |
Write the principle of the following refining methods : (a) vapour phase refining(b) chromatography |
|
Answer» ong>EXPLANATION: (i) The metal should FORM a volvatile compound with an available reagent. (ii) The volatile compound should be easily decomposable, so that the metal can be easily recovered. This method is USED for REFINING nickel, zirconium and titanium. |
|
| 34. |
An element having variable valency 2 and 4 |
|
Answer» ONG>Answer: anersw is 2 and PLZ plz plz plz plz plz MARKS me as brailiatent |
|
| 35. |
Soil? 10. How has the Green Revolution in some areas resulted in short-term gains butlong-term losses to farmers? |
|
Answer» ong>Explanation: The Green Revolution has resulted in short terms gains but it has become long term losses to farmers in some areas. The excessive USE of fertilizers and PESTICIDES made the crops to GROW artificially. The natural taste of the crops spoiled due to the use of CHEMICALS. ... The water reserves are also effected by Chemicals. i hope this was helpfull for u |
|
| 36. |
The order of the reaction for which the units of rate constant are mol dm-3 s-1 |
|
Answer» ONG>Answer: Read mol dm-3 s-1 as "moles per cubic DECIMETRE (or litre) per second". This means that every second the concentration of A was falling by 0.0040 moles per cubic decimetre. This RATE will DECREASE during the REACTION as A gets used up. Explanation: this is your answer |
|
| 37. |
How did Hitler turn nationalism into an abomination? |
|
Answer» ong>Answer: |
|
| 38. |
How many nmr signals in ethyl alchohol |
|
Answer» ONG>Explanation: For ethanol, CH3CH2OH, we EXPECT 3 PROTON signals CORRESPONDING to each of the 3 chemically different groups of protons. |
|
| 39. |
Name the method used for the refining of Zinc. |
|
Answer» trolytic REFINING |
|
| 40. |
Calculate the formal charge on o3(ozone) molecule |
|
Answer» ong>Answer: A formal charge is equal to the number of valence ELECTRONS of an atom MINUS the number of electrons assigned to an atom. Consider the resonance structures for O3 .Oxygen has 6 valence electrons. Look at the top left oxygen atom. It has two lone pairs ( 4electrons) and a double bond ( 2 electrons).Even though a double bond CONTAINS 4 electrons total and is counted as such when seeing that oxygen's octet is filled, 2 electrons belong to each oxygen and they are shared among the two. Let's examine the top resonance structure: Left: 6 valence −6 assigned =0 formal charge Center 6 valence −5 assigned =1 formal charge RIGHT: 6 valence −7 assigned = −1 formal charge Notice that even though the ATOMS have varying formal charges, the overall charge of O3 is the sum of the formal charges in the molecule: 0+1+(−1)=0 . IONS' formal charge sums are ≠0 . |
|
| 41. |
The molecular mass of Water is 18. a. Find the mass of 1 GMM H2O.b. How many moles are there in 180g of H2O |
|
Answer» ong>Answer: 10 mol hoge follow me |
|
| 42. |
3. Which of the following is not a chemical change ? a. Ripening of fruits.b. electrolysis of waterc. Dissolution of common salt in waterd. Heating of copper wire in presence of air at high temp. |
|
Answer» ONG>Answer: HEATING of copper wire in presence of air at high temp. Follow me Aur 5star rateing dena |
|
| 43. |
gas X at a pressure of 750mm of mercury and temperature 38 degree celsius has a volume of 2.57 litres.Find the volume of the gas X at s.t.p. |
| Answer» ONG>ANSWER: | |
| 44. |
Which of the following does not lead to thespread of democracy? |
|
Answer» ong>Explanation: Explanation: The CORRECT answer that does not LEAD to the spread of DEMOCRACY is the Invasion by the FOREIGN COUNTRIES |
|
| 45. |
How to make orgomagnesium |
|
Answer» ong>Answer: Grignard reagents are made by adding the halogenoalkane to small bits of magnesium in a flask CONTAINING ethoxyethane (commonly called diethyl ETHER or just "ether"). The flask is FITTED with a reflux condenser, and the mixture is warmed over a WATER bath for 20 - 30 minutes Explanation: hope it helps you PLEASE mark me as braineilist. |
|
| 46. |
Explain how elimate affect the distribution of population? |
|
Answer» ong>ANSWER: Of all the geographic influences on POPULATION distribution, climatic CONDITIONS are perhaps the most IMPORTANT. CLIMATE affects population distribution both directly as well as indirectly through its effects on soil, vegetation and agriculture that have direct bearings on the pattern of population distribution. Explanation: mark as brainliest |
|
| 47. |
What type of protein is present in keratin? |
|
Answer» ONG>Answer:STRONG> Answer:Alpha-keratin, or α-keratin, is a type of keratin found in vertebrates. This protein is the primary component in hairs, horns, mammalian claws, NAILS and the EPIDERMIS layer of the skin. α-keratin is a fibrous structural protein, meaning it is made up of amino acids that form a repeating secondary structure. The secondary structure of α-keratin is very similar to that of a traditional protein α-helix and forms a coiled coil. Due to its tightly wound structure, it can function as one of the strongest biological materials and has various functions in MAMMALS, from predatory claws to hair for warmth. α-keratin is synthesized through protein biosynthesis, utilizing transcription and translation, but as the cell matures and is full of α-keratin, it dies, creating a strong non-vascular unit of keratinized tissue. •♥️•♥️• HOPE IT HELPS YOU ♥️•♥️•♥️• |
|
| 48. |
Balance the skeletal equation k+02=k20 |
|
Answer» ONG>Answer: k+o2=k20 by cross multiplication 2k+0=k2+0 plz MARK brilliant and FOLLOWING me |
|
| 49. |
The element, which like hydrogen has one valence electron |
|
Answer» ong>Answer: HYDROGEN is a unique atom, because it has only TWO spots in its outermost electron LEVEL. Helium has two electrons and exhibits the properties of a NOBLE gas. Hydrogen's valence number is one, because it has only one valence electron and NEEDS only one shared electron to fill its energy levels. |
|
| 50. |
For the reaction A + 2B = products :The rate law is given asproductsR = k [A][B]²From the foll data, calc value of xand ySNO[A] (M)[B] (M)t½ (min)2losox4.102.100438y ч410 |
|
Answer» ong>ANSWER: A+2B→ products is : rate =K[A][B]2 Rate of the reaction at 30∘ C is FOUND to be 0.125 M/s , when [A]=2.0 M and [B]=0.4 M . |
|