CBSE 11TH CHEMISTRY - Online Test
Q1. The electron releasing tendency of the metals, zinc, copper and silver is in the order:
Answer : Option C
Explaination / Solution:
Zinc relases electrons to copper and copper releases electron to silver therefore the electron releasing tendency of the metals, zinc, copper and silver is in the order Zn>Cu>Ag.This is on the basis of electrochemical series or metal activity series.
Q2. In the modern periodic table
Answer : Option B
Explaination / Solution:
In modern periodic table, the elements are arranged in the increasing order of their atomic number. It contains 7 horizontal rows called periods and 18 vertical columns called groups.
Q3. The correct equation for change in enthalpy is:
Answer : Option A
Explaination / Solution:
Enthalpy is a thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume.
Q4. Isobars are the atoms with
Answer : Option C
Explaination / Solution:
Isobars are atoms (nuclides) of different chemical elements that have the same number of nucleons. Correspondingly, isobars differ in atomic number (or number of protons) but have the same mass number.
Q5. Tropospheric pollution is caused by :
Answer : Option C
Explaination / Solution:
Various oxides of sulphur, nitrogen and carbon like SO2, SO3, NO, NO2, CO and CO2 cause tropospheric pollutionand inflict harm to living beings.
Q6. Heavy hydrogen is also called
Answer : Option A
Explaination / Solution:
Deuterium, (D, or 2H), also called heavy hydrogen, isotope of hydrogen with a nucleus consisting of one proton and one neutron, which is double the mass of the nucleus of ordinary hydrogen (one proton). Deuterium has an atomic weight of 2.014.
Q7. 788 kJ of energy is required to separate one mole of solid NaCl into one mole of (g) and one mole of (g) to an infinite distance. This process explains
Answer : Option C
Explaination / Solution:
Lattice enthalpy is simply the change in Enthalpy associated with the formation of one mole of an ionic compound from its oppositely charged ions in their standard states under standard conditions.
Q8. The diagonal relationship exists between
Answer : Option A
Explaination / Solution:
Lithium shows diagonal relationship to Magnisium due to their nearly same polarising power, comparable electronegativities(Li=1.00, Mg=1.20) and small difference in radius (Li=152Pm, Mg=159pm).
Q9. Which of the following compounds contain all the carbon atoms in the same hybridisation state?
Answer : Option B
Explaination / Solution:
In option:A,all the 4 carbon atoms are sp-hybridized.
Q10. The kelvin scale is related to celsius scale as :
Answer : Option A
Explaination / Solution:
The relation between Kelvin scale & Celcius scale of temperatures is -
K = °C + 273.15
Such a relation is based upon the experimental findings and subsequent conclusion of Charle's law .
The Kelvin scale is also termed as " absolute scale of temperature."
It is interesting to note that temperature below 0o C ( ie. negative values ) are possible in Celcius scale but in Kelvin scale , negative temperature is not possible .
