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

$$ \text { Given below and the atomic masses of the elements: } $$

$$ \begin{array}{|l|l|l|l|l|l|l|l|l|l|} \hline \text { Element: } & \mathrm{Li} & \mathrm{Na} & \mathrm{Cl} & \mathrm{~K} & \mathrm{Ca} & \mathrm{Br} & \mathrm{Sr} & \mathrm{I} & \mathrm{Ba} \\ \hline \text { Atomic Mass }\left(\mathrm{g} \mathrm{~mol}^{-1}\right): & 7 & 23 & 35.5 & 39 & 40 & 80 & 88 & 127 & 137 \\ \hline \end{array} $$

$$ \text { Which of the following doesn't form triad? } $$
A
$\mathrm{Ba}, \mathrm{Sr}, \mathrm{Ca}$
B
$\mathrm{Cl}, \mathrm{Br}, \mathrm{I}$
C
$\mathrm{Cl}, \mathrm{K}, \mathrm{Ca}$
D
$\mathrm{Li}, \mathrm{Na}, \mathrm{K}$
2
KCET 2025
MCQ (Single Correct Answer)
+1
-0
The change in hybridization (if any) of the 'Al' atom in the following reaction is $\mathrm{AlCl}_3+\mathrm{Cl}^{-} \rightarrow \mathrm{AlCl}_4^{-}$
A
No change in the hybridization state
B
$s p^2$ to $s p^3$
C
$s p^3$ to $s p^3 d$
D
$\mathrm{sp}^3$ to $\mathrm{sp}^2$
3
KCET 2025
MCQ (Single Correct Answer)
+1
-0

If $\mathrm{A}=\left\{\mathrm{x}: \mathrm{x}\right.$ is an integer and $\left.\mathrm{x}^2-9=0\right\}$

$B=\{x: x$ is a natural number and $2 \leq x<5\}$

$\mathrm{C}=\{\mathrm{x}: \mathrm{x}$ is a prime number $\leq 4\}$

Then $(B-C) \cup A$ is,

A
$\{-3,3,4\}$
B
$\{2,3,4\}$
C
$\{3,4,5\}$
D
$\{2,3,5\}$
4
KCET 2025
MCQ (Single Correct Answer)
+1
-0

$A$ and $B$ are two sets having 3 and 6 elements respectively. Consider the following statements.

Statement (I): Minimum number of elements in AUB is 3

Statement (II): Maximum number of elements in AB is 3 Which of the following is correct?

A
Statement (I) is true, statement (II) is false
B
Statement (1) is false, statement (II) is true
C
Both statements (1) and (II) are true
D
Both statements (I) and (II) are false
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