MCQ
de-Broglie equation is
- A$\lambda=\frac{h v}{m}$
- B$\lambda=\frac{m v}{h}$
- C$\lambda= hmv$
- ✓$\lambda=\frac{h}{m v}$
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| list $I$ (species) | list $II$ ( $O-N-O$ angle) |
| $(A)$ $NO_2^+$ | $(1)$ $180^o$ |
| $(B)$ $NO_2$ | $(2)$ $132^o$ |
| $(C)$ $NO_2^-$ | $(3)$ $120^o$ |
| $(D)$ $NO_3^-$ | $(4)$ $115^o$ |
| $(5)$ $109^o$ |

$(A)$ Atoms of different elements differ in mass.
$(B)$ Matter consists of divisible atoms.
$(C)$ Compounds are formed when atoms of different element combine in a fixed ratio.
$(D)$ All the atoms of given element have different properties including mass.
$(E)$ Chemical reactions involve reorganisation of atoms.
Choose the correct answer from the options given below :