Recently Active Chemistry Questions

What is the total spin resulting from a d ^ 7 configuration ? ...

In Standard Hydrogen Electrode represented by Pt(s)|H2(g)|H+(aq) has the reaction H+(aq) + e-→ ½H2O.. so.. there is a gain of electrons=> reduction=> its a cathode.. the why is the standard hydrogen electrode taken a ...

In Standard Hydrogen Electrode represented by Pt(s)|H2(g)|H+(aq) has the reaction H+(aq) + e-→ ½H2O.. so.. there is a gain of electrons=> reduction=> its a cathode.. the why is the standard hydrogen electrode taken a ...

The percentage of void volume in face centred cubic lattice is a) 26% b) 0% c) 32% d) 74% ...

How does black body radiation prove the particle nature of light? Why can't it be explained using the wave nature? ...

9)What type of change occurs when we boil rice? Physical Chemical Both None Your Answer b Correct Answer a Your Score-1 How is this possible? Please check the real answer. ...

Whats products we obtain when ethyl propanoate reacts with C6H5MgBr then H2O + NH4Cl? Please so the mechanism ...

Specify the coordination geometry around and hybridisation of N and B atoms in a 1:1 complex of BF3 and NH3 a)N :tetrahedral,sp3 ,B :tethedral,sp3 b)N :pyramidal,sp3 , B :pyramidal,sp3 c)N :pyramidal,sp3, B :planar,sp2 d)N :p ...

Among the following structures, which is not a permissible resonance? *Image* *Image* *Image* 4.None of these ...

Among KO2, AlO2-, BaO2 and NO2+, unpaired electron is present in NO2+ and BaO2 KO2 and AlO2- KO2 only BaO2 only ...

One gram of which of the following contains the largest number of oxygen atoms? a) O b) O2 c) O3 d) All contain the same ...

Use the following information to answer the next question. A neutral element X has 10 electrons and 12 neutrons in its atom. The atomic number of element X is a) 10 b) 12 c) 20 d) 22 ...

In the following compounds, *Image* The order of basicity is a) IV > I > III> II b) III > I > IV > II c) II > I > III > IV d) I > III > II > IV ...

Which one of the following has variable valency ? a) Chlorine b) Sulphur c) Iron d) Sodium ...

Rutherford’s experiment on scattering of α-particles showed for the first time that the atom has a) Nucleus b) Electron c) Proton d) Neutron ...

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If a substance shows independent properties of its constituents, it is a) Element b) Compound c) Mixture d) All of these ...

The volume of helium is 44.8 L at (a) 100° C and 1 atm (b) 0° C and 1 atm (c) 0° C and 0.5 atm d) 100° C and 0.5 atm ...

Supposing the energy of fourth shell for hydrogen atom is – 50 a.u. (arbitrary unit). What would be its ionization potential a)50 b)800 c)15.4 d)20.8 what is ionization potential? ...

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The co-ordination number in hcp and ccp type of metallic crystals is a) 4 b) 8 c) 12 d) 6 ...

A substance that cannot be broken down into a simpler form by ordinary chemical means is called a(n) a) element b) compound c) mixture d) none of the above ...

An atom X is represented as follows {}_{21}^{45} ext{X} . The numbers of protons, electrons and neutrons in this atom are: a) 21, 21, 24 b) 21,21,23 c) 20,20,24 d) 20,20,23 ...

The size of colloidal solution is in the range of a) 1 – 100 nm b) 100 – 1000 nm c) 10-5 – 10-7 cm d) 107 – 109 cm ...

3 metals A (270), B (80) & C (10) crystallize in simple cubic, face centered cubic and body centered cubic (bcc) phases respectively with unit cell 3, 2 and 1 Å respectively. The densities of A:B:C are in the ratio of: a) 3 ...

The following reaction represents the burning of wood: {{left[ {{ ext{C}}_{6}}{{ ext{H}}_{10}}{{ ext{O}}_{5}} ight]}_{ ext{n}}}+ ext{a}{{left[ {{ ext{O}}_{2}} ight]}_{ ext{n}}} ext{b}{{left[ ext{C}{{ ext{O}}_{2}} ight]}_{ ext ...

The freauency of one of the lines in Paschen series of a hydrogen atom is 2.34 imes {10^{14}} Hz. The quatum number, {n_2} which produces this transitions is – a) Three b) Four c) Six d) Five ...

An atom of one element A has four elements in its outermost shell, and that of B has six electrons in the outermost shell. The formula of the compound formed by these two will be A2B AB2 A2B3 A3B2 Your Answer d Correct Answer ...

2)An atom X is represented as follows . The numbers of protons, electrons and neutrons in this atom are: a.21, 21, 24 b.21,21,23 c.20,20,24 d.20,20,23 Your Answer a Correct Answer b Your Score -1 How is that possible? Please ...

Why do elements like iron, nitrogen, phosphorus or copper have variable valencies? Thanks to the person who can help me in advance. Thanks, Bye, Angikar ...