NEET Chemistry Questions: Some Basic Concepts in Chemistry

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Identify the wrong statement in the following (AIEEE 2008).




The ozone layer in the stratosphere absorbs harmful ultraviolet radiation from the sun, preventing it from reaching the Earth's surface. It does not prevent infrared radiation from the sun, which is responsible for heating the Earth's surface.
In the reaction $ 2Al_{(s)}+ 6HCl_{(aq)} \rightarrow 2 Al ^{3+}_{(aq)} + 6Cl ^ - _{(aq)} + 3H_{2(g)} $ (AIEEE 2007)




No explanation available.
Consider a titration of potassium dichromate solution with acidified Mohr’s salt solution using diphenyl amine as indicator. The number of moles of Mohr’s salt required per mole of dichromate is (IIT JEE 2007)




The redox reaction between potassium dichromate and Mohr’s salt is : $ 6Fe^{2+} + Cr_2 O^{2-} _7 + 14H ^ + \rightarrow 6Fe ^ {3+} 2Cr ^ {3+} + 7H_2 O $
Which has maximum number of atoms ? (IIT JEE 2003)




$ Number of particles \alpha Number of moles $ $ No. of moles of carbon = 24 \12 = 2 $
Number of atoms in 560 g of Fe (atomic mass = 56) is (AIEEE 2002)




No explanation available.
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




No explanation available.
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 ?




No explanation available.
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.




No explanation available.