xi. A cell which produces electric current by a redox reaction is called alan: a) Electrolytic cell b) Voltaic cell c) Standard cell Half cell
rabiyaamin
Asked:
September 2023
xiv. A cathode has the reduction potential: a) Less than the anode b) More than the anode c) The same as that of anode d) Always zero
rabiyaamin
Asked:
December 2022
Q)energy of the body oscillating about mean position depends on its: a) frequency b) amplitude c) mass d) both a and b
rabiyaamin
Asked:
December 2022
The atomic radius along a transition series first decreases and then increases. it is due to a. Increase in unpaired electrons b. filled d-orbital c. Increase in Nuclear change d. All of the above. Please explain the answer
rabiyaamin
Asked:
December 2022
3 transition series belong to which period of the periodic table? a. 3 b. 4 c. 5 d.6
rabiyaamin
Asked:
December 2022
. Dissolution of sodium chloride in water is a a. Non-spontaneous exothermic process b. Non-spontaneous endothermic process c. Spontaneous exothermic process d. Spontaneous endothermic process Please explain the answer
rabiyaamin
Asked:
December 2022
3. In 1st transition series 3d orbital are filling. they occur in a. 3rd period of periodic table b. 4th period of periodic table c. 5th period of periodic table d. 6th period of periodic table. Please explain answer
rabiyaamin
Asked:
December 2022
- Water can be produced in laboratory by the following reaction 2H2 + O2 + 2H2O If Hf is the heat of formation of H20 and Hr is the heat of this reaction, then a. Hf=Hr b. Hf=Hr divided by 2 C. Hr = Hf divided by 2...
rabiyaamin
Asked:
December 2022
17. The melting of ice at body temperature is an processes of metabolizing food. How much ice (in grams) would you have to eat to counteract the endothermic process: H20(s)>H20(l) deltaH = +6.0 kJ/mol Thus eating ice counteracts the exothermic energy gained by eating 28,3g of peanuts considering...
rabiyaamin
Asked:
December 2022
The homolytic fission of C-C bond in ethane give an intermediate in which "C" is hybiridized. (a) sp3 (b) sp2 (c) sp (d) sp2d
M. How many isomers are possible for C2H60 (b) 4 (c) 8 (d) 5 (a) 2
rabiyaamin
Asked:
December 2022
A unit positive charge experiences a force of 20 N when placed in the field of source charge of 100 pc. The electric field is: a. 0.2x10N/C b. 20 N/C C. 0.2x104N/C d. 10-N/C
rabiyaamin
Asked:
December 2022
Group of molecules having zero dipole moment is a. CO2, BF3, H2, NH3, SO3, CCl4 and CS2 b. CO2, BF3, HCI, N2, SO3, CCl4 and CS2 C. CO2, BF3, H2, N2, SO3, CCl4 and CS2 d. CO2, BF3, H2, N2, SO2, CCl4 and CS2 Please explain the answer.
rabiyaamin
Asked:
December 2022
the resistivity of a material is 10 ohm. if the temperature drops by 2 degree C, then resistivity drops by 2 ohm. the temperature coefficient of resistivity of materials is: A) 10K-1 B) 2K-1 C)0.1K-1 D) 1.0K-1
rabiyaamin
Asked:
December 2022
. which of the following elements will have strongest Van Der Waal force of attraction between its molecules a. hydrogen b. oxygen C. chlorine d. nitrogen Plz explain the answer
rabiyaamin
Asked:
December 2022
Sigma bonds formed by sp - s overlapping in propyne molecule are: (a) 1 (b) 2 (d) 4 (c)3 Please explain the answer
rabiyaamin
Asked:
December 2022
According to Bohr's atomic model, number of possible spectral lines for excited hydrogen atom where n=4. (a) 10 (b) 8 (c) 6 (d) 4 Please provide answer with explanation
rabiyaamin
Asked:
December 2022
28. How much calcium is present in 0.1g of CaCO3? a. 0.01g b. 0.02g C. 0.03g d. 0.04g