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

  • 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 $-B$
$(1).$ Calgon $(a).$ $D_2O$
$(2).$ Perhydrol $(b).$ Zeolite
$(3).$ Heavy water $(c).$ Sodium hexametaphosphate
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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

In which of the following reactions,$H_2$ is liberated?
$i$. $Al_{(s)} + HCl_{(aq)} \rightarrow$
$ii$. $Al_{(s)} + NaOH_{(aq)} \rightarrow$
$iii$. $B_2H_{6(g)} + H_2O_{(l)} \rightarrow$
$iv$. $F_{2(g)} + H_2O_{(l)} \rightarrow$

$CuSO_4$ solution $+$ lime is called

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.

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