Which of the following orders is not correct?

  • A
    $H_2O_2 > F_2O_2$ ($O-O$ bond length)
  • B
    $PO_4^{3-} < HPO_3^{2-} < H_2PO_2^-$ ($P-O$ bond order)
  • C
    $N-N < P-P$ (Single bond strength)
  • D
    $2p-2p > 2s-2p > 2s-2s$ (Extent of axial overlapping)

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Fill in the blanks given below:
$(i)$ The energy required to completely separate one mole of a solid ionic compound into its gaseous constituent ions is called ........... .
$(ii)$ The angle formed between the orbitals containing bonding electrons around the central atom is called ........... .
$(iii)$ The energy required to break one mole of bonds is called ........... .
$(iv)$ The $VSEPR$ theory was proposed by scientists ............ and ........... .

$P_4O_{10}$ has short and long $P-O$ bonds. The number of short $(P=O)$ bonds in this compound is:

Which of the following statements is correct?

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If the structure of a stable molecule containing atoms of elements $X, Y$,and $Z$ is as shown in the figure,what could the elements $X, Y$,and $Z$ be respectively?

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Match List-$I$ with List-$II$ :
List-$I$ List-$II$
$(A)$ $C_{2}H_{4}$ $(I)$ $3\sigma$ bonds,$2\pi$ bonds
$(B)$ $C_{2}H_{2}$ $(II)$ $3\sigma$ bonds,$1$ lone pair
$(C)$ $CH_{4}$ $(III)$ $4\sigma$ bonds
$(D)$ $NH_{3}$ $(IV)$ $5\sigma$ bonds,$1\pi$ bond

Choose the correct answer from the options given below :

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