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

Which of the following methods of expressing concentration are unitless?

A

Mole fraction and Mass percent (W/W)

B

Molality and Mole fraction

C

Mass percent (W/W) and Molality

D

Molality and Molarity

2
KCET 2025
MCQ (Single Correct Answer)
+1
-0

Select the INCORRECT statement/s from the following:

(a) 22 books have infinite significant figures

(b) In the answer of calculation $2.5 \times 1.25$ has four significant figures,.

(c) Zero's preceding to first non-zero digit are significant

(d) In the answer of calculation $12.11+18.0+1.012$ has three significant figures

A
b, c and d
B
b and c only
C
b and d only
D
a and b only
3
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
$\mathrm{Li}, \mathrm{Na}, \mathrm{K}$
4
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 $\mathrm{sp}^2$
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