Consider a helium (He) atom that absorbs a photon of wavelength 330 nm. The change in the velocity (in cm s^-1) of the He atom after the photon absorption is_____.
(Assume: Momentum is conserved when the photon is absorbed.
Use: Planck constant = 6.6 × 10^-34 J s, Avogadro number = 6 × 1023 mol^-1, Molar mass of He = 4 g mol^-1)

The calculated spin only magnetic moments of $\left[ Cr \left( NH _{3}\right)_{6}\right]^{3+}$ and $\left[ CuF _{6}\right]^{3-}$ in BM, respectively, are
(Atomic number of $Cr$ and $Cu$ are $24$ and $29$ , respectively)

For the following reaction $2 X+Y \xrightarrow{k} P$ the rate of reaction is $\frac{d[P]}{d t}=k[X]$ Two moles of $X$ are mixed with one mole of $Y$ to make $10\, L$ of solution At $50 \,s$, $05$ mole of $Y$ is left in the reaction mixture The correct statement(s) about the reaction is(are) (Use : $\ln\,2 = 0693)$

$2,4-DNP $ test can be used to identify :

For the following reaction;
$\begin{array}{l}2X + Y\overset{k}{\rightarrow}P\end{array}$

The rate of reaction is
$\begin{array}{l}\frac{d[P]}{dt} = k[X]\end{array}$
Two moles of X are mixed with one mole of Y to make 1.0 L of solution. At 50 s, 0.5 mole of Y is left in the reaction mixture. The correct statement(s) about the reaction is(are). (Use: ln 2 = 0.693)

Some standard electrode potentials at 298 K are given below:
Pb²⁺/Pb –0.13 V
Ni²⁺/Ni –0.24 V
C²⁺/Cd –0.40 V
Fe²⁺/Fe –0.44 V
To a solution containing 0.001 M of X²⁺ and 0.1 M of Y²⁺, the metal rods X and Y are inserted (at 298 K) and connected by a conducting wire. This resulted in the dissolution of X.
The correct combination(s) of X and Y, respectively, is(are)
(Given: Gas constant, R = 8.314 J K^-1 mol^-1, Faraday constant, F = 96500 C mol^-1)

The major product formed in the following reaction is

The pair(s) of complexes wherein both exhibit tetrahedral geometry is(are)
(Note: py = pyridine, Given: Atomic numbers of Fe, Co, Ni and Cu are 26, 27, 28 and 29, respectively)