1
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Kf (water) = 1.86 K kg mol-1. The temperature at which ice begins to separate from a mixture of 10 mass % ethylene glycol is
A
$$ - $$1.86 $$^\circ $$C
B
$$ - $$3.72 $$^\circ $$C
C
$$ - $$3.3 $$^\circ $$C
D
$$ - $$3 $$^\circ $$C
2
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
The radius of the first Bohr orbit of a hydrogen atom is 0.53 $$\times {10^-8}$$ cm. The velocity of the electron in the first Bohr orbit is
A
$$2.188 \times {10^8}$$ cm s-1
B
$$4.376 \times {10^8}$$ cm s-1
C
$$1.094 \times {10^8}$$ cm s-1
D
$$2.188 \times {10^9}$$ cm s-1
3
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Which of the following statements is not true for the reaction, 2F2 + 2H2O $$ \to $$ 4HF + O2 ?
A
F2 is more strongly oxidising than O2
B
F $$ - $$F bond is weaker than O = O bond
C
H $$ - $$F bond is stronger than H$$ - $$O bond
D
F is less electronegative than O
4
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
The number of unpaired electrons in the uranium (92U) atom is
A
4
B
6
C
3
D
1
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