Chemistry Test 24

Result

Chemistry Test 24

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

The pyrimidine bases present in DNA are

A
cytosine and thymine

B
cytosine and uracil

C
cytosine and adenine

D
cytosine and guanine

Solution

In DNA, there are four nitrogenous bases i.e. adenine, guanine, thymine and cytosine, in which adenine and guanine are purines bases, while mononuclear nitrogenous base i.e. cytosine and thymine are pyrimidine bases.
Question 2
4 / -1

Which one has the highest boiling point?

A
He

B
Ne

C
Kr

D
Xe

Solution

London dispersion forces increase from He to Xe because molecular mass increases. So boiling point will also increase from He to Xe.
Question 3
4 / -1

Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?

A
Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character

B
he ionic sizes of Ln (III) decrease in general with increasing atomic number

C
Ln (III) compounds are generally colourless

D
Ln (III) hydroxides are mainly basic in character.

Solution

Most of the Ln(III) compounds are coloured due to f – f transition.
Question 4
4 / -1

Alkyl halides react with dialkyl copper reagents to give

A
alkenes

B
alkyl copper halides

C
alkanes

D
alkenyl halides

Solution

R₂CuLi + R'X → R-R' + R-Cu + LiX