CaC2 and H2O react to produce
CaC2 and H2O reacts to produce C2H2 (acetylene gas).
CaC2(s) + 2H2O(l)Ca(OH)2(aq) + C2H2
What is theH of the reaction?
CH2Cl2 (g)C (g) + 2H (g) + 2Cl (g)
The average bond energies of C-Cl bond and C-H bond are 416 kJ and 325 kJ mol-1 respectively.
In the reaction, two moles of C-H bonds and two moles of C-Cl bonds are broken. Hence, energy absorbed is
= 2 x 416 + 2 x 325
Which of the following is a wrong statement ? In a given period of the Periodic Table, the s-block element has, in general, a higher value of
Electronegativity, ionisation energy and electron affinity of s-block elements in their respective period is low but the atomic radius of the s-block elements is larger in their respective period due to less effective nuclear charge.
The IUPAC name of the following compound is
None of the above
IUPAC name of the above compound is 3-methylpent-3-en-2-ol
Which of the following is a Lewis acid ?
Lewis acid is any substance that can accept a pair of non- bonding electrons, such as the H+ ions. It is an electron pair acceptor.
Lewis base is any substance that can donate a pair of electrons.
OH-, F- and NH3 are Lewis base because they can donate a lone pair of electrons while H+ is a Lewis acid because it can accept a lone pair ofelectrons.
Ammonia gas can be dried over
Ammonia is dried over quick lime (CaO). It cannot be dried over conc. H2SO4, P2O5 and CaCl2 because it reacts with these compounds.
Inorganic benzene is
None of these
B3N3H6 (borazine) is known as inorganic benzene. Borazine is isoelectronic,i.e. same number of electrons and isosteric,i.e. same number of atoms with benzene.
The only o p-directing group which is deactivating in nature is
-NH2, -OH and -R (alkyl groups) all are o/p- directing and they activates the benzene ring -(X) halogens are howevero/p-directing but deactivate the benzene ring by withdrawing electrons fron the ring due to -I effect.
The bond length of HCl bond is 2.29 x 10-10 m. The percentage ionic character of HCl, if measured dipole moment is 6.226 x 10-30 C- m, is
= e x d = 1.6 x 10-19 x 2.29 x 10-10
= 3.664 x 10-29 C-m
% ionic character =
Which of the organic compounds will give red colour in Lassaigne test ?
None of these
If both nitrogen and sulphur are present in a organic compound, they will give red blood colour with Lassaigne test due to the formation of ferric thiocyanate.
Na + C + S + NNaSCN (sodium thiocyanate)
Fe3+ + 3NaSCNFe(SCN)3 + 3Na+