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See all →- A and B each have certain number of oranges. A says to B, “ if you give me 10 of your oranges, Suppose A has x no. of oranges and B has y no. of oranges. According to the given conditions, we have x+10=2(y−10)⇒x−2y+30=0 (i) and, y+10=x... 1
- std 10th maharashtra board science part 1 gravitation notes Answer: Gravitation (Std 10 Science Part 1, Chapter 1) - solved exercise notes. 1. Match the entries and rewrite them in correct rows Quanti... 2
- Niobium forms bcc structure the density of niobium is 8.55 g/cm3 and length of unit cell edge Answer: In 0.5 g of niobium there are 1.62×10²¹ unit cells and 3.24×10²¹ atoms. Given: bcc so n = 2 atoms per unit cell, ρ = 8.55\ g cm⁻³ ,... 2
- The density of iridium is 22.4 g/cm3 . The unit cell of iridium is fcc. Calculate the radius of iridium atom. Molar mass of iridium is 192.2 g/mol. Answer: Radius of iridium atom r ≈ 136\ pm (edge length a ≈ 385\ pm ) Given: ρ = 22.4\ g cm⁻³ , M = 192.2\ g mol⁻¹ , fcc unit cell so n = 4... 1
- E. A student used a carbon pencil to write his homework. The mass of this was found to be 5 mg. With the help of this calculate. Given : mass of carbon = 5mg = 5× 10⁻³ g Atomic mass of carbon=12u Solution :: a. The number of moles of carbon in his homework writing numb... 1
- M.In two moles of acetaldehyde (CH3 CHO) calculate the following a. Number of moles of carbon b. Number of moles of hydrogen Answer: (a) 4 mol C, (b) 8 mol H, (c) 2 mol O, (d) 1.2044 × 10²⁴ molecules Molecular formula of acetaldehyde: CH₃CHO = C₂H₄O. One molecule (... 1
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See all →- Mention the number of unpaired electrons and geometry of following complexes :(i) [Ni (Cl)4]2–(ii) [Ni (CN)4]2–Convert the following :(a) Ethanenitrile into ethanal.(b) Cyclohexane into adipic acid. Answer: [NiCl₄]²⁻: 2 unpaired electrons, tetrahedral; [Ni(CN)₄]²⁻: 0 unpaired electrons, square planar. In both complexes Ni is in the +2 st... 1
- Derive the relation between half life period and rate constant for first order reaction.Write the net cell reaction during discharging of lead accumulator.Draw the structure of peroxymonosulphuric acid. Answer: t_(1/2) = 0.693/k Half-life of a first order reaction: The integrated rate law is k = 2.303/tlog₁₀[A]₀/[A]_t . At t = t_(1/2) , [A]_... 1
- Predict the type of cubic lattice of a solid element having edge length of 400 pm and density is 6·25 g/ml(Atomic mass of element = 60)Define : NanoscienceWrite chemical reaction for the preparation of polyacrylonitrile. Answer: n = 4, face-centred cubic (fcc) lattice ρ = nM/a³N_A\ ⇒\ n = ρ a³N_A/M a = 400 pm = 4×10⁻⁸ cm; a³ = 64×10⁻²⁴ = 6.4×10⁻²³ cm ³ ; ρ =... 1
- Define : (i) Extensive and Intensive properties(ii) Isobaric and Adiabatic processesWhat are enzymes?Write the atomic numbers of transuranium elements. Answer: (i) Extensive property: a property whose value depends on the amount of matter in the system, e.g. mass, volume, internal energy, en... 1
- Convert the following :(i) acetaldehyde to isopropyl alcohol.(ii) cumene to phenol.(iii) anisole to phenol.Write two uses of neon. Answer: (i) Acetaldehyde to isopropyl alcohol: add methylmagnesium bromide, then hydrolyse. CH₃CHO + CH₃MgBr → (dry ether) (CH₃)₂CH–OMgBr →... 1
- Write the preparation of potassium dichromate from chromite ore. Answer: Potassium dichromate is prepared from chromite ore (FeCr₂O₄, i.e. FeO·Cr₂O₃) in three steps. Step 1: Conversion to sodium chromate.... 1
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See all →- SSC Class 10 Board Exam 2027: 4-Month Study Plan (Nov–Feb) A month-by-month plan for the Maharashtra SSC board exam 2027: daily routine, subject-wise tips, how to use board papers, and free practice...
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