1
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
Based on equation E = $$-$$ 2.178 $$ \times $$ 10$$-$$18 J $$\left( {{{{Z^2}} \over {{n^2}}}} \right)$$, certain conclusions are written. Which of them is not correct ?
A
Equation can be used to calculate the change in energy when the electron changes orbit.
B
For n = 1, the electron has a more negative energy than it does for n = 6 which means that the electron is more loosely bound in the smallest allowed orbit.
C
The negative sign in equation simply means that the energy of electron bound to the nucleus is lower than it would be if the electrons were at the infinite distance from the nucleus.
D
Larger the value of n, the larger is the orbit radius.
2
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following structure is similar to graphite?
A
B4C
B
B2H6
C
BN
D
B
3
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3? The concentrated acid is 70% HNO3.
A
70.0 g conc. HNO3
B
54.0 g conc. HNO3
C
45.0 g conc. HNO3
D
90.0 g conc. HNO3
4
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be
A
0.118 V
B
1.18 V
C
0.059 V
D
0.59 V