निम्नलिखित में से कौन सा तत्व अपनी +3 ऑक्सीकरण अवस्था में 'केवल-प्रचक्रण' (spin-only) चुंबकीय आघूर्ण प्रदर्शित नहीं करता है?

The correct decreasing order of basic character of the given transition metal monoxides is:

In which of the following pairs do both elements NOT have the (n-1)d10ns2 electronic configuration?

In the following pairs, the one in which both transition metal ions are colourless is: