$H_2C_2O_4 \xrightarrow{\Delta } \text{gas } (A) + \text{gas } (B) + \text{liquid } (C)$.
$\text{Gas } (A) \text{ burns with a blue flame and is oxidised to gas } (B)$.
$\text{Gas } (A) + Cl_2 \to (D) \xrightarrow{NH_3, \Delta } (E)$.
$A, B, C \text{ and } E \text{ are}$

  • A
    $CO_2, CO, H_2O, HCONH_2$
  • B
    $CO, CO_2, COCl_2, HCONH_2$
  • C
    $CO, CO_2, H_2O, NH_2CONH_2$
  • D
    $CO, CO_2, H_2O, COCl_2$

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Match the correct option from Column $-A$ and Column $-B.$
Column $-A$ Column $-B$
$(1).$ $H_2O_2$ $(p).$ As moderator
$(2).$ $D_2O$ $(q).$ As fuel
$(3).$ Liquid $H_2$ $(r).$ For to make hard water soft
$(4).$ Zeolite $(s).$ As disinfectant

Correlate the items listed in Column $I$ with those listed in Column $II$. Find out as many correlations as you can.
Column $I$ Column $II$
$A$. Synthesis gas $1$. $Na_2[Na_4(PO_3)_6]$
$B$. Dihydrogen $2$. Oxidising agent
$C$. Heavy water $3$. Softening of water
$D$. Calgon $4$. Reducing agent
$E$. Hydrogen peroxide $5$. Stoichiometric compounds of $s-$block elements
$F$. Salt like hydrides $6$. Prolonged electrolysis of water
$7$. $Zn + NaOH$
$8$. $Zn + dil. H_2SO_4$
$9$. Synthesis of methanol
$10$. Mixture of $CO$ and $H_2$

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Fill in the blanks:
$(1)$ Only $..........$ element of group $-6$ forms hydride.
$(2)$ $..........$ is used as a moderator in nuclear reactors.
$(3)$ The three-dimensional arrangement in ice occurs due to $..........$ bonding.
$(4)$ $..........$ method is used to obtain $H_2O_2$ from $2-$ethylanthraquinol.

Sodium oxalate on heating with conc. $H_2SO_4$ gives

Match the following columns:
Column-$I$ Column-$II$
$(i)$ Hydrogen peroxide $(a)$ Used as air purifier in submarines
$(ii)$ Calcium sulphate hemihydrate $(b)$ Used for water softening
$(iii)$ Potassium superoxide $(c)$ Antiseptic
$(iv)$ Calgon $(d)$ Plaster of Paris

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