Q.

Which of the following statement is/are correct?

Moderate

Want to Fund your own JEE / NEET / Foundation preparation ??

Take the SCORE scholarship exam from home and compete for scholarships worth ₹1 crore!*
An Intiative by Sri Chaitanya

a

In the lanthanide series the electrons occupy 4f-orbtals in preference to 5d the and 6p-orbitals.

b

Zero group was not present in the periodic table when Mendeleev presented it.

c

Law of octave was presented by Newland.

d

Cuprous compounds are coloured while cupric compounds are colourless

answer is A.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Statement (a) is wrong.Cu(Z=29),3d10,4s1Cu⊕( cuprous )=3d104s0Cu2+( cupric )=3d94s0(one unpaired electron and hence is coloured)
ctaimg

Get Expert Academic Guidance – Connect with a Counselor Today!

+91

Connect with our

Expert Counsellors

access to India's best teachers with a record of producing top rankers year on year.

+91

We will send a verification code via OTP.

whats app icon