Chemistry - Online Test
Q1. Defect shown by non – ionic solids is
Answer : Option A
Explaination / Solution:
Non ionic solids shows interstitial defect.
Q2. One of the following is a fibre.
Answer : Option A
Explaination / Solution:
Polyamide is also a fibre.
Q3. Which allotrope of phosphorous is most stable?
Answer : Option A
Explaination / Solution:
Black Phosphorus is most stable isotope of phosphorus because it is highly polymerized form of phosphorous.
Q4. An exothermic process
Answer : Option A
Explaination / Solution:
Exothermic process results in decrease in enthalpy of system hence for exothermic reaction ΔH= -ve.
Q5. Gravity separation technique is mainly applicable to
Answer : Option B
Explaination / Solution:
Gavity separation is done maily for oxide ores.
Q6. Atomic number of element Unnilhexium is:
Answer : Option D
Explaination / Solution:
un=1 Nil=0 Hex=6 So 106=uninilhexium.
Q7. Absorption spectrum, seen as dark lines in an otherwise continuous spectrum, for a given material results from the material's (atom or molecules)
Answer : Option A
Explaination / Solution:
In an absorption spectrum, portions of a continuous spectrum (light containing all wavelengths) are missing because they have been absorbed by the medium through which the light has passed; the missing wavelengths appear as dark lines or gaps.
Q8. Hydrocarbons are formed by :
Answer : Option A
Explaination / Solution:
Hydrocarbons are formed by incomplete combustion of fossil fuels used in automobiles. When they undergo incomplete combustion, they are partially oxidised and produce other fragments of hydrocarbons along with CO and C.
Q9. Maximum magnetic moment is shown by
Answer : Option D
Explaination / Solution:
Magnetic moment is maximum for the element having maximum unpaired electrons.
Q10. The oxidation of toluene to benzoic acid can be stopped at the aldehyde stage. to give benzadehyde, The reagent used for the purpose is one of the following.
Answer : Option B
Explaination / Solution:
This is Etard Reaction.
