1
AP EAPCET 2024 - 18th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The diffraction pattern of crystalline solid gave a peak at $20=60^{\circ}$. What is the distance ( in cm ) between the layers which gave this peak?

( $\lambda$ of $X$-rays is $1.54 \mathring{A}$ ) $\left(\sin 30^{\circ}=0.5, \sin 60^{\circ}=0.866 ; n=1\right)$

(a) $8.89 \times 10^{-8}$
A
$8.89 \times 10^{-9}$
B
$8.89 \times 10^{-1}$
C
$1.54 \times 10^{-8}$
D
1.54
2
AP EAPCET 2024 - 18th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The concentration of 1 L of $\mathrm{CaCO}_3$ solution is 1000 ppm . What is its concentration in mol $\mathrm{L}^{-1}$ ?

$$ (\mathrm{Ca}=40 \mathrm{u}, \mathrm{O}=16 \mathrm{u}, \mathrm{C}=12 \mathrm{u}) $$

A
$10^{-3}$
B
$10^{-1}$
C
$10^{-4}$
D
$10^{-2}$
3
AP EAPCET 2024 - 18th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
At 293 K , methane gas was passed into 1 L . of water. The partial pressure of methane is 1 bar. The number of moles of methane dissolved in 1 L water is ( $K_{\mathrm{H}}$ of methane $=0.4 \mathrm{~K}$ bar)
A
1.38
B
$138 \times 10^{-2}$
C
$138 \times 10^{-3}$
D
$1.38 \times 10^{-1}$
4
AP EAPCET 2024 - 18th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The $E^{-}$of $M\left|M^{2+} \| \mathrm{Cu}^{2+}\right| \mathrm{Cu}$ is 0.3 V .

At what concentration of $\mathrm{Cu}^{2+}\left(\mathrm{in} \mathrm{mol} \mathrm{L} \mathrm{L}^{-1}\right)$, the $\mathrm{E}_{\mathrm{cel}}$ value becomes zero ? $\left(\frac{2.303 R T}{F}=0.06\right)$

(Conc. of $\mathrm{M}^{2+}=0.1 \mathrm{M}$ )

A
$10^{-3}$
B
$10^{-11}$
C
$10^{-8}$
D
$10^{-10}$
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