1
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
In which of the following pairs of molecules/ions, both the species are not likely to exist?
A
$$H_2^+$$ , $$He_2^{2-}$$
B
$$H_2^-$$ , $$He_2^{2-}$$
C
$$H_2^{2+}$$ , $$He_2$$
D
$$H_2^-$$ , $$He_2^{2+}$$
2
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
Stability of the species Li2, $$Li_2^−$$ and $$Li_2^+$$ increases in the order of:
A
Li2 < $$Li_2^+$$ < $$Li_2^-$$
B
$$Li_2^+$$ < $$Li_2^-$$ < Li2
C
$$Li_2^-$$ <$$Li_2^+$$ < Li2
D
$$Li_2^-$$ < Li2 < $$Li_2^+$$
3
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
For gaseous state, if most probable speed is denoted by C*, average speed by $$\mathop C\limits^{\_\_} $$ and mean square speed by C, then for a large number of molecules the ratios of these speeds are:
A
C*: $$\mathop C\limits^{\_\_} $$ : C = 1.128 : 1.225 : 1
B
C*: $$\mathop C\limits^{\_\_} $$ : C = 1.225 : 1.128 : 1
C
C*: $$\mathop C\limits^{\_\_} $$ : C = 1 : 1.225 : 1.128
D
C*: $$\mathop C\limits^{\_\_} $$ : C = 1 : 1.128 : 1.225
4
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0oC. As it does so, it absorbs 208J of heat. The values of q and w for the process will be :
(R = 8.314 J/mol K) ( l n 7.5 = 2.01)
A
q = – 208 J, w = – 208 J
B
q = – 208 J, w = + 208 J
C
q = + 208 J, w = + 208 J
D
q = + 208 J, w = – 208 J
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