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A mixture of FeO and Fe3O4 when heated in air to constant weight gains 5% in its weight .The % of FeO in the sample is? ...
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A block of mass m is attached to one end of a long elastic rope. The other end of the elastic rope is fixed to the roof of a building. Initially the block is in contact with the roof at the point where the rope is fixed and i ...
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a) A 2.36 g sample of dolomite containing CaC03 and MgC03 were dissolved in 700 ml_ of decinormal solution of HCI. The solution was diluted to 2.5L and 25mL of this solution required 20 mL 0.01 N NaOH solution for complete ne ...
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when NaCl is doped with MgCl2 the nature of the defect produced is? explain ...
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A particle located at x=o at time t=0 starts moving along the positive X-direction with a velocity v that varies with time is? explain ...
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integrate 1/1+x^4 ...
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Two identical charge particles enter a uniform magnetic field with same speed but the at angles 30° and 60° with field . Let a,b and c be the ratio of their time periods ,radii and pitches of the helical paths than (a)abc = ...
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A free point charge q and mass m is at rest at the origin .A constant electric field E = E0(i^- j^) and constant magnetic field B = -B k^ is present in whole region .When this charge reaches at position (2,20) its speed be ∠...
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1-bromo prop-1-ene + Bu-Li+ → A A+CuI + ether → B B+ 3-bromo cyclohex-1-ene → C what is C? plz briefly specify the mechanism ...
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Two metal pieces having a potential difference of 800 V are 0.02 m apart horizontally. A particle of mass 1.96 X 10-15 kg is suspended in equilibrium between the plates. If e is the elementary charge, then charge on the parti ...
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pKa1, pKa2 and pKa3 of H3PO4 are x,y,z respectively . pH 0.1 M Na2HPO4 solution is ...
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pKb of NH3 is 4.74. The pH when 100ml of 0.01 M NH3 solution is 50% neutralised by 0.01 M HCL is plzz explain ...
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Number of unhybridised orbitals in vinyl acetylene are (A) 2 (B) 3 (C) 4 (D) 6 ...
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Which is an acidic hydrocarbon (A) CH3CH2CH2CH3 (B) CH3C≡CCH3 (C) CH3C≡CH (D) CH2 = CH – CH = CH2 ...
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A particle of charge q and mass m is moving in a circular orbit of radius r with angular speed ω. Another particle of charge 2q and mass 2m is moving in a circular orbit of radius 2r with the same angular speed ω. Let μ1 a ...
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The IUPAC name of [CuCl2{O=C(NH2)2}2] is A) dichloridobis(urea)copper(II) B) bis(urea)dichloridocopper(II) C) dichloridobis(ureaido)copper(II) D) bis(ureaido)dichloridocopper(II) ...
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Why are peroxides good free radical initiator? ...
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A four digit number is called doublet if any of its digit is the same as only one neighbor . For example, 1221 is doublet but 1222 is not . Number such doublets are ...
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For all real numbers a; b; c prove the following chain inequality 3(a2 + b2 + c2) ≥ (a + b + c)2 ≥ 3(ab + bc + ca): ...
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The number of 5 digit numbers such that the sum of their digits is even is? ...
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Number of permutations of 1,2,3,4,5,6,7,8 and 9 taken all at a time ,such that the digit 1 appearing somewhere to left of 2 3 appearing to the left of 4 and 5 somewhere to the left of 6 (e.g.815723946 would be one such permut ...
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all possible three digits even numbers which can be firmed with the condition that if 5 is one of the digit,then 7 is the next digit is? ...
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number of 9 digits numbers divisible by 9 using the digits from 0 to 9 if each digit is used atmost once is K.8!, then k has value equal to? ...
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in how many ways can the letters of the word CINEMA be arranged so that the order of vowels do not change ...
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the number of four digits having only two consecutive digits identical is ?? ...
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Will C Cl4 give white precipitate of Ag Cl on heating it with Ag NO3? ...
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The rate constant for a first order reaction is equal to the initial > rate of reaction when the initial concentration of the reactant is ...
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A force overrightarrow{F,}=-K(yhat{i}+xhat{j}) (where K is a positive constant) acts on a particle moving in the xy-plane. Starting from the origin, the particle is taken along the positive x-axis to the point (a, 0) and then ...
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Find the slope of the curve plotted between P V s T for closed container of volume 2 lit having same moles of gas ...
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A pulley fixed to the ceilling carries a string with blocks of mass m and 3 m attached to its ends. The masses of string and pulley are negligible. When the system is released, its centre of mass moves with what acceleration ...
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