Test Preparation on IIT JEE Mains Mock Test-14
CHEMISTRY
Nitrogen and halogens in a given organic compound can be estimated respectively by
Nitrogen can be estimated by Kjeldahl's and halogens are estimated by the Carius method.
Halides of alkali metals possess NaCl type structure with 6:6 coordination. What will happen if these are subjected to high pressure?
When subjected to high-pressure NaCl type structure will transform to 8:8 coordination
Diamagnetic and paramagnetic species among
Ni(CO)4, [Ni(CN)4]2- and [NiCl4]2- are:
Ni(CO)4 and [Ni(CN)4]2- are diamagnetic and [NiCl4]2- is paramagnetic.
100 cm3 of gas at 1270C and pressure "P", is compressed to 50 cm3 at the same temperature. In order to occupy 75 cm3 volume, the compressed gas should be heated to:
Apply Boyle’s law,
P1V1 = P2V2 (T is constant) P x 100 = P2 x 50 P2 = 2P v1/t1=v2/t2 , 50/400=75/T2,T2=75x400/50=600K
Al cannot be extracted by electrolysis of fused
aluminium chloride because
Al cannot be extracted by electrolysis of fusedaluminium chloride because it is a covalent compound and is a poor conductor of electricity.
Increasing carbon contents in steel
On increasing carbon contents in steel ductility decreases but tensile strength increases.
Ammonium phosphate on heating gives :
Ammonium phosphate on heating gives ortho phosphoric acid (H3PO4) and ammonia; ortho phosphoric acid on heating at 873K forms metaphophoric acid (HPO3)
What mass of O2 would be formed from the
reaction of 34.0 g H2O2, 180.0 g KMnO4 and
excessof H2SO4 according to followingequation.
(mol wt. of H2O2 = 34 amu, KMnO4 = 158 amu) ?
H2O2 + 2KMnO4 + 3H2SO4 → K2SO4 + 2MnSO4 + 8H2O + 5O2
5H2O2+2KMnO4+3H2SO4 K2SO4+2MnSO4+8H2O+5O2
5 x 34g 2x 158 =316g 5x32= 160g
34 g of H2O2 will react with 316/5 = 63.2 g of KMnO4
to form 160/5 = 32g of O2
Here H2O2 is a limiting reagent.
Which of the following is incorrect?
CH3CH2CH2CH2OH on heating with Al2O3 undergoes dehydration to form an alkene and not an aldehyde.
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