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In the standardization of $ Na_2S_2O_3 using K_2Cr_2O_7 by iodometry, the equivalent weight of K_2Cr_2O_7 $ is (IIT JEE 2001)
$ During the reaction, Cr_2O_7 ^{ 2-} changes to Cr^{3+} $. Hence the change in oxidation number of Cr is 6. $ \therefore Equivalent weight = { Molar mass \over 6 } $
Mixture X=0.02 mole of $ [Co(NH_3)_5SO_4] Br and 0.02 mole of[Co(NH_3)_5Br]SO_4 was prepared in 2L of Solution 1L of mixture X + excess AgNO_3 \rightarrow Y 1L of mixture X+ excess BaCl_2 \rightarrow Z $ Number of mole of Y and Z are (IIT JEE 2003)
$ In 2L solution, there are 0.02 mol Br ^ - ions and 0.02 mole so ^{ 2-} _4 $ $ \therefore 1 L of mixture X contains 0.01 mol Br ^ – and 0.01 mol SO ^{2-} _{4} $ ions. $ Hence, Y= 0.01 mol Ag Br Z= 0.01 mol BaSO_4 $
How many moles of electron weight one kilogram ? (IIT JEE 2002)
$ Mass of an electron = 9.108 \times 10 ^ {31} Kg $ $ No. of electron s in 1 Kg = { 1 \over 9.108 \times 10 ^ {-31} } $ $ = { 1 \over 9.108 \times 10 ^ {-31 } \times 6.023 \times 10^ {23} mol ^ {-1} }$ $ = { 10 ^ 8 \over 9.108 \times 6.023 } mol $
A container is filled with 2L of water. What will be the volume of water in m3?
The volume of a liquid is typically measured in liters (L) or cubic meters (m^3). 1 L = 1 x 10^-3 m^3. Therefore, 2 L = 2 x 10^-3 m^3.
The mass of carbon -12 atom considered in the definition of a mole is
The drug which is used for treating AIDS victims is
Azidothymidine, also known as Zidovudine or AZT, is an antiretroviral medication used for the treatment of HIV/AIDS. It was one of the first drugs approved for the treatment of HIV/AIDS, and it remains an important component of many antiretroviral therapy regimens.
Chose the incorrect statement .
The incorrect statement is 'The properties of a compound are same as its constituent elements.' A compound has different properties than its constituent elements due to the formation of new bonds and the rearrangement of atoms in a specific way.
Which of the following is a pair of physical and chemical property respectively of a substance ?
What is the symbol of S.I. unit for the amount of substance ?
The SI unit for the amount of substance is 'mol' (mole). It represents the number of particles (atoms, molecules, ions, etc.) present in a given substance. One mole contains approximately 6.022 × 10^23 particles, known as the Avogadro constant.
Find the correct relation.
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