MCQ
Hydrogen bond energy is equal to
- A$3 -7$ $cals$
- B$30 -70\, cals$
- ✓$3 -10\, k\,cals$
- D$30 -70\, k\,cals$
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| List $I$ | List $II$ |
| $P$. $\quad \underset{X}{\left( C _2 H _5\right)_3 N }+\underset{ Y }{ CH _3 COOH }$ | $1.$ Conductivity decreases and then increases |
| $Q.$ $\quad \underset{X}{ KI (0.1 M )}+\underset{ Y }{ AgNO _3(0.01 M )}$ | $2.$ Conductivity decreases and then does not change much |
| $R.$ $\quad \underset{X}{ CH _3 COOH }+\underset{ K }{ KOH }$ | $3.$ Conductivity increases and then does not change much |
| $S$. $\quad \underset{X}{ NaOH }+\underset{Y}{ HI }$ | $4.$ Conductivity does not change much and then increases |
Codes: $ \quad P \quad Q \quad R \quad S $
$Na _2 O + H _2 O \rightarrow 2 X$
$Cl _2 O _7+ H _2 O \rightarrow 2 Y$
(Atomic numbers $Ce =58, Gd =64$ and $Eu =63 .)$
$(a)$ $\left( NH _{4}\right)_{2}\left[ Ce \left( NO _{3}\right)_{6}\right]$
$(b)$ $Gd \left( NO _{3}\right)_{3}$ and
$(c)$ $Eu \left( NO _{3}\right)_{3}$
Answer is :
(Atomic No. $Y = 39$, $La = 57$, $Eu = 63$, $Lu = 71$)