Select Board & Class

Login
Adithya asked a question
Subject: Chemistry, asked on on 21/6/16
what is n factor of mohr's salt how to calculate it explain in detail please
Ansh Pratap asked a question
Subject: Chemistry, asked on on 23/11/17
Describe a method of preparing oxygen without using a source of heat. mention a test of oxygen.
In long plz i want is fast.
Gaurav Gupta & 1 other asked a question
Subject: Chemistry, asked on on 14/7/16
Formation of polyethylene from calcium carbide takes place as follows:
           CaC2 + H2O -> Ca(OH)2 + C2H2 -> C2H4
          ​  ​n(C2H4) -> ( -CH2-CH2- )n
Determine the amount of polyethylene possibly obtainable from 64.0 kg CaCl2 .
 
Kanishk M.khobragade asked a question
Subject: Chemistry, asked on on 17/6/20
Why CO2 is considerd as a pure substance ?
Manideep Varma asked a question
Subject: Chemistry, asked on on 8/7/16
vapour pressure of pure water is 40mm.if a non volatile solute is added to it vapour pressure falls by 4mm,hence molarity of solution is
Uma asked a question
Subject: Chemistry, asked on on 27/2/19
a molecule XY3 contains 3 sigma bonds and 2 lone pairs on an atom , predict the hybridization
Kashish Verma asked a question
Subject: Chemistry, asked on on 3/6/16
calculate the volume of water required to add in mixture of 250 ml of 0.6 M HCl and 750ml of 0.2 M HCl to obtain 0.25 M solution of HCl.
Maanya asked a question
Subject: Chemistry, asked on on 20/6/21
explain the following
acc to gram atomic mass one gram 28gm N = 2 moles N but acc to gram molecular mass 28gm N = 1 mole if we can get the no. of moles from gram atomic mass than what is the need og gram molecular mass.
Siddharth Sudhakar asked a question
Subject: Chemistry, asked on on 28/7/16
What volume of H2 at STP is required to reduce 0.795 of CuO to give Cu and H2O.
Bhavya Arora asked a question
Subject: Chemistry, asked on on 22/5/17
An organic compound was found to contain the following constituents : C 33% H 4.7% N 13.2% Cl 33.4%. Determine the empirical formula.
Awadhesh Thakkar asked a question
Subject: Chemistry, asked on on 15/12/16
what concentration of HCOO is present in a solution of 0.01M HCOOH ( Ka = 1.8*10^-4 ) and 0.01M HCL ?
Krishna Vamsi asked a question
Subject: Chemistry, asked on on 29/6/16
the volume of 1.5m h3po4 solution required  to neutralize exactly 90 ml of a 0.5m ba(oh)2 solution is
Pianist asked a question
Subject: Chemistry, asked on on 1/9/17
What is stock solution?
Ramninder Singh Purba asked a question
Subject: Chemistry, asked on on 20/4/16
language problem
Manideep Varma asked a question
Subject: Chemistry, asked on on 26/6/16
when 200ml of 1.2m hcl is mixed with 100ml of water then what will be the new molarity of the solution after dilution
Manasi Mujumdar asked a question
Subject: Chemistry, asked on on 6/10/17
Solubility of which among the following solids in water changes slightly with temperature?
(A) KNO3 (B) NaNO3 (C) KBr (D) NaBr
Adithya asked a question
Subject: Chemistry, asked on on 18/6/16
50g of CaCO​3is added in 500mL 5N H2SO4 solution . calculate the normality of given mixture provided that the react with each other in the reaction CaCO3+H2SO4----> CaSO4+H2O when they react we use the formula Nmix= N1V1-N2V2/V1+V2why is that "minus -" sign n general why when they react we use this formula pls explain in detail
Almas asked a question
Subject: Chemistry, asked on on 10/4/17
What is the value of n-factor of [Fe(CN)6]4- in the given reaction 
[Fe(CN)6]-4 .....in presence of MnO4- / H+ --> Fe3+ + CO2 + NO3-
a) 18
b) 31
c) 61
d) 28
Deeksha Tanwar asked a question
Subject: Chemistry, asked on on 2/9/17
the values of Kp1 and Kp​2 for the reaction X​​​=Y+Z and A=2B are in ratio of 9:1 . if the degree of dissociation of Xand A are equal the total pressure at equibrium in both reactions are in the ratio of?
Shaffron asked a question
Subject: Chemistry, asked on on 10/5/17
State the principle of measurement of a physical quantity.
Adithya asked a question
Subject: Chemistry, asked on on 6/6/16
calculate the total molarity and normality of all the ions present in a solution containing 0.1M CuSO4 and 0.1M Al2(SO4)3
Akshita asked a question
Subject: Chemistry, asked on on 18/7/17
ques no 24 may be 3 option and 25 may be 4 option with solution .
Suvarna Thapa asked a question
Subject: Chemistry, asked on on 15/10/16
in the session, there is a topic of conversion into fahrenheit , celcius, kelvin . There is a question temperature changes from 25 to 50 degree celsius...we have to represent this in kelvin and fahrenheit the answer for kelvin is 25 but for fahrenheit is should be 45 but in the recording it is given 25 and then there is a conclusion that no matter whatever maybe the conversions in temperatures the difference in all of them are same tht is here it is 25k & 25F is it correct?
Almas asked a question
Subject: Chemistry, asked on on 24/1/17
If one litre of air is passed repeatedly over heated copper and magnesium till no further reduction in volume takes place. The volume finally obtained would be approximately 
a) 800 ml
b) 200 ml 
c) 10 ml 
d) zero
Please tell how to approach these kind of questions  
Akshita asked a question
Subject: Chemistry, asked on on 18/7/17
ques no 13 and 14 with explaination
Almas asked a question
Subject: Chemistry, asked on on 29/11/16
If M is the molar mass of P4, then its equivalent mass in the reaction is 
P4 + OH- ----> PH3 + H2PO2-
a) M/12
b) M/4
c) M/3
​d) M
Priyanka Priyanka asked a question
Subject: Chemistry, asked on on 29/7/17
Mole fraction of solvent in aqueous solution of naoh having molality of 3 is ?
Krishna Vamsi asked a question
Subject: Chemistry, asked on on 30/5/16
calculate the weight in gramsof 0.9 gram atoms of zinc
Aldrin Inbaraj asked a question
Subject: Chemistry, asked on on 18/6/16
A gas at 4 bar and 20oC is heated to 30oC at constant volume.Determine the final pressure of the gas
Bhavya Arora asked a question
Subject: Chemistry, asked on on 19/5/17
How to determine atomicity using Avogadro law?
Nevadhya asked a question
Subject: Chemistry, asked on on 29/6/16
10 g of a crystalline metal sulphate salt when heated generates approximately 6.4 g of an anhydrous salt of the same metal. The molecular weight of the anhydrous salt is 160 g. The number of water molecule present in the crystal is :
A) 1
B) 2
C) 3
D) 5
Shaffron asked a question
Subject: Chemistry, asked on on 10/5/17
Name the two parameters which are required to express any measurement .
Krishna Vamsi asked a question
Subject: Chemistry, asked on on 23/6/16
molarity of 0.2n h2so4 is
Sudipti Kumar asked a question
Subject: Chemistry, asked on on 24/4/16
Mam , when we will multiply (6.023 * 10^23) * (1.382 * 10^-23), 10^23 and 10^-23 will turn into 10^0 ?
Akshita asked a question
Subject: Chemistry, asked on on 28/6/17
How to slovequestions of empricial formula ????
Akshita asked a question
Subject: Chemistry, asked on on 18/7/17
ques no 17 and 19
Deepshika Subramani asked a question
Subject: Chemistry, asked on on 20/4/16
sir is molar mass and molecular mass the same thing or is atomic mass and molar mass the same thing
Mohammed Siddique .m asked a question
Subject: Chemistry, asked on on 9/7/17
A solution of A(MM=20) and B(MM=10)[Mole fraction xB=0.6]having desity 0.7 gm/ml,then molarity and molaity of b in this solution will be
Almas asked a question
Subject: Chemistry, asked on on 26/11/16
The molarity of HCl formed on mixing equal volumes of 1 M BaCl2 and 0.4 M  H2SO4 is ?
Adithya asked a question
Subject: Chemistry, asked on on 6/6/16
calculate the normality of mixture when 200ml of 0.2N HCl and 100ml of 0.5N NaOH are mixed
Pyb asked a question
Subject: Chemistry, asked on on 20/4/16
IS THE PROPERTIES OF A COMPOUND IS SAME OR DIFFERENT TO THE PROPERTIES OF ITS CONSTITUENT ELEMENTS. FOR EXAMPLE- THE PROPERTIES OF A COMPOUND WATER IS SAME OR DIFFERENT TO THE PROPERTIES OF ITS CONSTITUENTS ELEMENTS HYDROGEN AND OXYGEN
Priyanka Priyanka asked a question
Subject: Chemistry, asked on on 29/7/17
In the reaction 2so2+02------>2so3 when one mole of o2 are made to react
Medha asked a question
Subject: Chemistry, asked on on 19/5/16
calculate the emperical formula of a compound "A" which is obtained from the catalytic hydrogenation of acetiline if this compound contains 92.7% carbon and 7.3% hydrogen???
 
Bhavya Arora asked a question
Subject: Chemistry, asked on on 16/5/17
Silver chloride was prepared in two ways:- 1. 0.5g of a silver wire was dissolved in concentrated nitric acid and the excess hydrochloric acid was added to it.The precipitate of silver chloride was separated by filtration washed dried and then weighed. The weight of the residue was found to be 0.66g. 2. In other experiment 1g of silver metal was heated in a current of chlorine till it was completely converted into chloride whicj was found to weigh 1.32g
Saloni Priya asked a question
Subject: Chemistry, asked on on 20/4/16
sir I can't understand the concept of accuracy and precision clearly. plzz explain in detail.
Nevadhya asked a question
Subject: Chemistry, asked on on 29/6/16
Emulsification of 10 ml of oil in water produces 2.4 x 1018 droplets. If the surface tension at the oil-water interface is 0.03 Jm-2x ​​ and the area of each droplet is 12.5 x 10-16 m2, the energy spent in the formation of oil droplets is :
A) 90 J
B) 30 J
C) 900 J
D) 10 J
Akshita asked a question
Subject: Chemistry, asked on on 18/7/17
ques no 4 with explaination
Ramninder Singh Purba asked a question
Subject: Chemistry, asked on on 23/4/16
Explain Molar Volume?????
Anshika asked a question
Subject: Chemistry, asked on on 22/5/17
a) what will be the normality of 7 g/l H2SO4 ?
b) what will be the strength of N/8 KOH solution in g/l ?
Nevadhya asked a question
Subject: Chemistry, asked on on 29/6/16
Upon mixing equal volumes of aqueous solutions of 0.1 M HCl and 0.2 M H2SO4, the concentration of H+ in the resulting solution is : 
A) 0.30 mol/L
B) 0.25 mol/L
C) 0.15 mol/L
D) 0.10 mol/L
 
Pianist asked a question
Subject: Chemistry, asked on on 28/6/17
Kind explain question number 72 and 73
Janvi asked a question
Subject: Chemistry, asked on on 22/4/16
why there is a need to find Molarity and Molality of a substabnce ?
Adithya asked a question
Subject: Chemistry, asked on on 13/6/16
Calculate the Normality of mixture when 200mLof 0.2N HCland 100mLof 0.5 NaOH are mixed they react each other in the reaction HCl+NaOH----> NaCl +H2O
Kumud asked a question
Subject: Chemistry, asked on on 21/4/16
sie actuallu em not getting dat ...if the compound is conataining any impurity ...even if its single basic unit i.e as uh said entity consists o f impurity den d total ratio of the mass must change...must vary...den y its d d same???
Jennifer Philip asked a question
Subject: Chemistry, asked on on 23/4/16
the other day in the live session on the classification of matter slide there was a statement " In compounds the properties ofconstituent elements is not
retained" what does this mean ?
'
Saloni Priya asked a question
Subject: Chemistry, asked on on 20/4/16
sir in ur video recording there was a question regarding significant numbers :
2.5 X 5.2= __________ and according to U it's answer is 13.0 .
Could U plzz explain the reason behind this ans , as in many refernce books like sl arora , it's given
to go with less number of significant number in case of multiplication and division.
Also according to me the answer should be 13.
Chhavi Tomer asked a question
Subject: Chemistry, asked on on 28/6/17
5.82gm of silver coin was dissolved in strong nitric acid and excess sodium chloride was added.the silver chloride precipitate were dried and weighed 7.2gm. calculate % of silver in the coin.
What are you looking for?

Syllabus