The compound 'A' when treated with methyl alcohol and few drops of H₂SO₄ give wintergreen smell. The compound 'A' is
1-Phenylethanol can be prepared by the reaction of benzaldehyde with
The spectrum produced due to transition of an electron from M to L shell is
The correct order of increasing energy of atomic orbitals is
Combination of two AO's lead to the formation of
Elimination of bromine from 2- bromobutane results in the formation of
IUPAC name of CH₃-O-C₂H₅ is
The name of according to IUPAC nomenclature system is
The bond order in NO is 2.5 while that in NO+ is 3. Which of the following statements is true for these two species?
Higher the bond order, shorter will be the bond length. Thus, NO+ is having higher bond order than that of NO so NO+ has shorter bond length.
The segment of DNA which acts as the instructional manual for the synthesis of the protein is
A gene is the molecular unit of heredity of a living organism. It is widely accepted by the scientific community as a name given to some stretches ofdeoxyribonucleic acids (DNA) and ribonucleic acids (RNA) that code for apolypeptide or for an RNA chain that has a function in the organism, though there still are controversies about what plays the role of the genetic material
K₄[Fe(CN)₆] is a
What are the products formed in the reaction of xenon hexafluoride with silicon dioxide
The hardness of transition elements is due to their
Transition elements show metallic character as they have low ionization energies and have several vacant orbitals in their outermost shell. This property favors the formation of metallic bonds in the transition metals and so they exhibit typical metallic properties.These metals are hard which indicates the presence of covalent bonds. This happens because transition metals have unpaired d-electrons. The d-orbital which contains the unpaired electrons may overlap and form covalent bonds. Higher the number of unpaired electrons present in the transition metals, more is the number of covalent bonds formed by them. This further increases the hardness of the metal and its strength.
Sodium nitroprusside reacts with sulphide ion to give a purple colour due to the formation of :
To a solution containing equimolar mixture of sodium acetate and acetic acid, some more amount of sodium acetate solution is added. The pH of mixture solution
The reason for geometrical isomerism by 2-butene is
If chloroform is left open in air in presence of sun rays
Ionisation potential of hydrogen is
Hydrogen has higher ionisation potential than chlorine, because hydrogen has only one electron and small size. This electron experiences the direct attraction of the nucleus and there is no shielding effect. Whereas in Cl the combined effect of the increase in the atomic size and the screening effect more than compensates the effect of the increased nuclear charge. Consequently, the valence electrons become less firmly held by the nucleus and ionisation potential decreases.
Which is an example of thermosetting polymer?
KO2 (potassium super oxide) is used in oxygen cylinders in space and submarines because it
Because it absorbs CO2 and increases O2 concentration according to the following reaction
4KO2 + 2CO2 → 2K2CO3 + 3O2
If x = Group number of Europium (atomic number 63)
y = Period number of Americium (atomic number 95)
z = Most stable oxidation state shown by Gadolinium (atomic number 64)
then find the value of x + y + z?
The decomposition of hydrogen peroxide follows first order kinetics.
2H2O2(aq) → 2H2O(ℓ) + O2(g)
If the volume of O2 gas liberated at STP in first 20 minutes of the start of decomposition is 25.00 ml, what should be the total volume of O2 gas (in ml) collected in time, t >> t1/2.
(t1/2 for the decomposition of H2O2 is 10 min)
How many H-atom can be exchanged by D-atom when the following compound is kept in solution for long time?
Find out the number of following orders which are INCORRECT against the mentioned properties :
(i) Ortho hydrogen > Para hydrogen (Stability at low temperature)
(ii) Ethanol > Glycerol (Viscosity)
(iii) D2 < He (Boiling Point)
(iv) HF > H2O (Melting point)
(v) H3BO3 > BF3 (Melting point)
(vi) NH3 < SbH3 (Boiling point)
(vii) H2O2 > H2O (Strength of hydrogen bond)
(viii) H2O < D2O (Freezing point)
(ix) < HF (Strength of hydrogen bond)
(x) D2O < H2O (Bond energy)
A metal crystallises as simple cubic crystal. The distance between the next nearest neighbours of each atom is pm. The atomic radius of metal atoms (in pm) is