The inter-nuclear distance in O—O bonds for respectively are:
Arrange the following compounds in their C—H bond length:
(I) CH3F (II) CH2F2 (III) CHF3
Arrange the following species in increasing order of stability:
Li2, Li2+, Li2–
Which of the following is correct structure of S2Cl2?
Elements X and Y have valence shell electronic configuration as:
X: ns2np1 Y: ns2np3
Which compound is likely to be formed?
M+3 has electronic configuration as [Ar]3d104s2, hence it lies in following block:
Pick out the property which is not shown by transition metals:
Which one is correct:
Which among the following is both a molecule and a compound?
H2O is both a molecule and a compound. This is because the atoms which make them are not the same.
Standard reduction potentials in acidic medium for F2, Cl2, Na, Zn are in the order:
Consider the compounds PF5, SbF5, PH3 and SbH3. The strongest acid and strongest base among these are resp:
Among SiCl4, P(O)Cl3, NF3, trans-[SnCl4(py)2] (py = pyridine), those with zero dipole moments are:
The nodal plane in the π-bond of ethene is located in:
Ionic hydrides reacts with water to give
Consider (I) I-, (II) Se2-, (III) Br‑, (IV) O2-, (V) F- and arrange them in decreasing order of ionic radius.
Which pair is different from others?
The d-bond is formed via the overlap of (considering z-axis as the inter-nuclear axis):
First, Second and Third ionization energy values are 100 eV, 150 eV and 1500 eV. Element can be?
Which of the following compunds is not formed by all alkali metals?
All alkali metals form hydrides, hydroxides and amide but metals like Li and Na do not from superoxide MO2.
Least acidic tri-halide is?
What are the hydrolysis products of calcium carbide?
Noble gases (like He, Ne, Ar, Kr etc) are isolated from air. One of the steps is/are
To an acidified dichromate solution, a pinch of Na2O2 and ether is added and shaken. What is the observation?
The reason for the chemical inertness of gaseous nitrogen at room temperature is best given by its:
The correct increasing order of melting points of the following is:
Which reaction lead to adduct formation:
Which represents Alkali metals based on IE1and IE2 values?
Ionic radii are:
Which has maximum stability?
Which is best oxidizing agent?
An atom differs from its ion in which among the following ?
When an atom loses or gains electrons its forms its corresponding ion, and hence it differs in number of electrons.
For example, H atom has 1 electron. Whereas H+ ion has 0 electrons. On the other hand, H− ion has 2 electrons.
Select correct statement(s)
Which of the following statement(s) is/are correct?
Which of the following will give H2O2 on hydrolysis?
Which statement is/are correct?
Select correct statement(s):
Which of the following statement(s) is/are true?
For the process, select the correct alternate:
X(g) + e– → X–(g), ∆H = x
X–(g) →X(g) + e–, ∆H = y
Which pair represent/s correct first IE?
Select correct alternate(s):
The number of pairs which shows correct order of angle:
(I) NH3 > PH3 (II) H2S < H2O (III) NO2+ > NO2 (IV) NO2+ > NO2–
(V) NO2– > NO2+ (VI) Cl2O < OF2 (VII) H2O > OF2
Total number of compound(s) having ‘X-X’ linkage. (where X is 15th group element):
N2O4, N2O, P4O6, N2O3, N2H4, P4S10, N2O5, H4P2O6, H2N2O2
Find number of interstitial carbides among following:
V2C, V4C3, CaC2, Mg2C3, SiC, B4C, Al4C3, WC, V6C5, TiC, Cr3C2, Nb4C3, Mo3C2.
The bond angle in PBr3 is 101°. The percentage ‘s’ character of the central atom is: [upto 2 decimal place]
Calculate the total number of possible resonating structures of HN3 and NaN3 [provide combined value]:
For Na2B4O7.10H2O, determine the value of X + Y + Z
X = Total number of water molecules of crystallization
Y = Total number of B—O—B bonds
Z = Total number of tetrahedral boron atoms
Find the number of superoxides among following: Li2O, Na2O2, KO2, RbO2, CsO2
Maximum oxidation state shown by Mn is?
Electronegativity = [IE + EA]/N. This ‘N’ is?
Catenation is maximum for the element with atomic number?
Among the following the number of compounds/ions having a linear structure is:
The total number of lone pairs of electrons in N2O3 is:
The dipole moment of HCl is 1.03 D, if H—Cl bond distance is 1.26 Å, what is the percentage of ionic character in the H—Cl bond?
The molecule MLx is planar with 7 pairs of electrons around M in the valence shell. The value of x is:
In complete hydrolysis of P4S6, how many water molecules are required?
Consider the following reaction:
The number of possible isomers for [A] is:
How many oxygen atoms are shared in Pyroxenes?
Number of unpaired electrons n Gd(64) is?
Maximum oxidation state shown by Chalcogens is?
How many of following silicates are Neso-silicates?
Be2SiO4, Zn2SiO4, Sc2SiO7, ZrSiO4, Mg2SiO4, LiAl(SiO3)2, Fe2SiO4, Mg3Si4O10(OH)2