Chemistry - Online Test
Q1. In Daniell cell, direction of current is
Answer : Option D
Explaination / Solution:
Current is taken at the direction in which positive charge is flowing, but electrons are negatively charged. So, the direction of current and the direction of electron flow is opposite.
Q2. Semi conductors have conductivity (in ) in the range of
Answer : Option C
Explaination / Solution:
They are in between conductors and insulators.
Q3. Nylon – 2 – Nylon – 6 is
Answer : Option C
Explaination / Solution:
They both are biodegradable polymer.
Q4. Which among the following does not exhibit positive oxidation state?
Answer : Option D
Explaination / Solution:
Fluorine is most electronegative element, it shows only -1 oxidation state.
Q5. Spontaneity in the context of chemical thermodynamics means
Answer : Option C
Explaination / Solution:
spontaneity means a reaction occurring on its own without any help of external agency.
Q6. In extraction of gold and silver, the metals is leached into aqueous solution using
Answer : Option B
Explaination / Solution:
CN−forms complex with gold or silver.
Q7. f-block of the Periodic Table consists of
Answer : Option C
Explaination / Solution:
The two rows of elements at the bottom of the Periodic Table, called the Lanthanoids, Ce(Z = 58) – Lu(Z = 71) and Actinoids, Th(Z = 90) – Lr (Z = 103) are characterised by the outer electronic configuration (n-2)f1-14 (n-1)d0-1 ns2. The last electron added to each element is filled in f- orbital. These two series of elements are hence called the Inner- Transition Elements (f-Block Elements).
Q8. According to quantum mechanics ψ2(r) the wave function squared gives
Answer : Option D
Explaination / Solution:
Probability density of finding an electron at a point with in an atom, it is posible to predict region around the nucleus where electron can most probably be found.
ψ has no physical significance while ψ2 represnts the probability density of finding an electron.
Q9. The gas released during volcanic eruptions is :
Answer : Option C
Explaination / Solution:
CO2 is the second most abundant gas released in volcanic eruption after water vapours.
Q10. Which one of the following is an example of non – typical transition elements?
Answer : Option A
Explaination / Solution:
Zn, Cd and Hg are not considered as transition elements because they donot have incompletely filled d orbital in its ground state or stable oxidation state
