1
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

If in case of a radio isotope the value of half-life (T$$_{1/2}$$) and decay constant ($$\lambda$$) are identical in magnitude, then their value should be

A
0.693/2
B
(0.693)$$^{1/2}$$
C
(0.693)$$^2$$
D
0.693
2
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Suppose a gaseous mixture of He, Ne, Ar and Kr is treated with photons of the frequency appropriate to ionize Ar. What ion(s) will be present in the mixture?

A
Ar$$^+$$
B
Ar$$^+$$ + Kr$$^+$$
C
Ar$$^+$$ + He$$^+$$ + Ne$$^+$$
D
He$$^+$$ + Ar$$^+$$ + Kr$$^+$$
3
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

A solution containing 4g of polymer in 4.0 litre solution at 27$$^\circ$$C shows an osmotic pressure of 3.0 $$\times$$ 10$$^{-4}$$ atm. The molar mass of the polymer in g/mol is

A
820000
B
82000
C
8200
D
820
4
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

The equivalent weight of KIO$$_3$$ in the given reaction is (M = molecular mass):

$$\mathrm{2Cr{(OH)_3} + 4O{H^ - } + KI{O_3} \to 2CrO_4^{2 - } + 5{H_2}O + KI}$$

A
M
B
M/2
C
M/6
D
M/8
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