GATE CY 2021 Question Paper (06-Feb-2021) (Shift 1)

The correct order of Lewis acid strengths of BF₂Cl, BFClBr, BF₂Br and BFBr₂ is:

The correct order of increasing intensity (molar absorptivity) of the UV-visible absorption bands for the ions [Ti(H₂O)₆]³⁺, [Mn(H₂O)₆]²⁺, [CrO₄]${}^{2\text{–}}$ , and [NiCl₄]${}^{2\text{–}}$ is:

The correct statement(s) about the concentration of Na⁺ and K⁺ ions in animal cells is/are:

The correct statement(s) about actinides is/are:

The number of photons emitted per nanosecond by a deuterium lamp (400 nm) having a power of 1 microwatt (rounded off to the nearest integer) is ______. [h = 6.626 × 10⁻³⁴ kg m² s⁻¹ ; c = 3.0 × 10⁸ m s⁻¹ ]