1
KCET 2025
MCQ (Single Correct Answer)
+1
-0

The electronic configuration of X and Y are given below:

$$ \begin{aligned} & X: 1 s^2 2 s^2 2 p^6 3 s^2 3 p^3 \\ & Y: 1 s^2 2 s^2 2 p^6 3 s^2 3 p^5 \end{aligned} $$

Which of the following is the correct molecular formula and type of bond formed between X and Y ?

A
$X_3 Y$, ionic bond
B
$X_2 Y_3$, coordinate bond
C
$\mathrm{XY}_3$, covalent bond
D
$\mathrm{X}_2 \mathrm{Y}$, covalent bond
2
KCET 2025
MCQ (Single Correct Answer)
+1
-0

$$ \text { Match List-I with List-II } $$

List-I (Types of redox reactions) List-II (Examples)
a. Combination reaction i. Cl 2 ( g ) + 2 Br ( aq ) 2 Cl ( aq ) + Br 2 ( 1 ) Cl 2 ( g ) + 2 Br ( aq ) 2 Cl ( aq ) + Br 2 ( 1 ) Cl_(2(g))+2Br_((aq))^(-)rarr2Cl_((aq))^(-)+Br_(2(1))
b. Decomposition reaction ii. 2 H 2 O 2 ( aq ) 2 H 2 O ( l ) + O 2 ( g ) 2 H 2 O 2 ( aq ) 2 H 2 O ( l ) + O 2 ( g ) 2H_(2)O_(2(aq))rarr2H_(2)O_((l))+O_(2(g))
c. Displacement reaction iii. CH 4 ( g ) + 2 O 2 ( g ) Δ CO 2 ( g ) + 2 H 2 O ( l ) CH 4 ( g ) + 2 O 2 ( g ) Δ CO 2 ( g ) + 2 H 2 O ( l ) CH_(4(g))+2O_(2(g))rarr"Delta"CO_(2(g))+2H_(2)O_((l))
d. Disproportionation reaction iv. 2 H 2 O ( 1 ) Δ 2 H 2 ( g ) + O 2 ( g ) 2 H 2 O ( 1 ) Δ 2 H 2 ( g ) + O 2 ( g ) 2H_(2)O_((1))rarr"Delta"2H_(2(g))+O_(2(g))

$$ \text { Choose the correct answer from the options given below. } $$

A
a-iv, b-iii, c-i, d-ii
B
a-ii, b-i, c-iv, d-iii
C
a-iii, b-iv, c-i, d-ii
D
a-iii, b-ii, c-i, d-iv
3
KCET 2025
MCQ (Single Correct Answer)
+1
-0

In the following pairs, the one in which both transition metal ions are colourless is

A
$\mathrm{Sc}^{3+}, \mathrm{Zn}^{2+}$
B
$\mathrm{V}^{2+}, \mathrm{Ti}^{3+}$
C
$\mathrm{Zn}^{2+}, \mathrm{Mn}^{2+}$
D
$\mathrm{Ti}^{4+}, \mathrm{Cu}^{2+}$
4
KCET 2025
MCQ (Single Correct Answer)
+1
-0

In the reaction between hydrogen sulphide and acidified permanganate solution,

A
$\mathrm{H}_2 \mathrm{~S}$ is reduced to $\mathrm{S}, \mathrm{MnO}_4^{-}$is oxidised to $\mathrm{Mn}^{2+}$
B
$\mathrm{H}_2 \mathrm{~S}$ is oxidised to $\mathrm{SO}_2, \mathrm{MnO}_4^{-}$is reduced to $\mathrm{MnO}_2$
C
$\mathrm{H}_2 \mathrm{~S}$ is reduced to $\mathrm{SO}_2, \mathrm{MnO}_4^{-}$is oxidised to $\mathrm{Mn}^{2+}$
D
$\mathrm{H}_2 \mathrm{~S}$ is oxidised to $\mathrm{S}, \mathrm{MnO}_4^{-}$is reduced to $\mathrm{Mn}^{2+}$
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