Chemistry - Online Test
Q1. Aldehydes are produced on reduction of the following by DIBAL – H
Answer : Option C
Explaination / Solution:
Both Nitriles and esters are reduced to Aldehyde on reaction with DIBAL-H.
Q2. Dihydrogen is used in fuel cells for generating electrical energy because
Answer : Option C
Explaination / Solution:
The fuel cell was invented in 1839 by Welsh lawyer Sir William Robert Grove. It takes in Hydrogen and Oxygen from the air and puts out electricity, heat, and water. It doesn't use fossil fuels and it doesn't produce greenhouse gases and so it should be the ideal solution to providing distributed or portable electrical power.
Q3. Liquid dishwashing agents are
Answer : Option A
Explaination / Solution:
Liquid dishwashing agents are non ionic detergents.
Q4. In which of the following compounds the oxidation state of the nickel atom is 0?
Answer : Option A
Explaination / Solution:
CO is neutral ligand so Ni has 0 oxidation state.
Q5. Difference between ionic (electrolytic) and electronic conductivity is that electronic conductance takes place in metals by ________ conductance takes place in solutions by ions
Answer : Option A
Explaination / Solution:
Electrolytic conductivity is due to the movement of ions and electronic conductivity is due to the movement of electrons.
Q6. Bond angle helps us in
Answer : Option A
Explaination / Solution:
Bond angles also contribute to the shape of a molecule. Bond angles are the angles between adjacent lines representing bonds. The bond angle can help differentiate between linear, trigonal planar, tetraheral, trigonal-bipyramidal, and octahedral. The ideal bond angles are the angles that demonstrate the maximum angle where it would minimize repulsion, thus verifying the VSEPR theory.
Q7. One of the following is the rarest of all alkaline earth metals
Answer : Option C
Explaination / Solution:
Ra is found in Uranium and thorium ores in trace amounts as small as a seventh of a gram per ton of uraninite so it is rarest of all alkaline earth metals
Q8. Covalent bonds are formed with other carbon atoms due to
Answer : Option D
Explaination / Solution:
Catenation is the linkage of atoms of the same element into longer chains.Catenation occurs most readily in carbon, which forms covalent bonds with other carbon atoms to form longer chains and structures. This is the reason for the presence of the vast number of organic compounds in nature.
Q9. Significant figures are
Answer : Option A
Explaination / Solution:
Significant digits are certain digits that have significance or meaning to certain digits in a number . Such digits help scientists to use them with more precise information about measurement and other numeric data. These digits also help them in rounding off very large or very small number
Q10. Finkelstein reaction is
Answer : Option C
Explaination / Solution:
Halide exchange reaction is Finkelstein reaction in which alkyl chloride is converted to alkyl iodide.
