NTA JEE Main 7th April 2013 Online
For the following questions answer them individually
NTA JEE Main 7th April 2013 Online - Question 31
The molarity of a solution obtained by mixing 750 mL of 0.5(M) HCl with 250 mL of 2(M) HCl will be
NTA JEE Main 7th April 2013 Online - Question 32
How many litres of water must be added to 1 litre of aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2?
NTA JEE Main 7th April 2013 Online - Question 33
Experimentally it was found that a metal oxide has formula $$M_{0.98}O$$. Metal M, is present as $$M^{2+}$$ and $$M^{3+}$$ in its oxide. Fraction of the metal which exists as $$M^{3+}$$ would be:
NTA JEE Main 7th April 2013 Online - Question 34
A gaseous hydrocarbon on combustion gives 0.72 g of water and 3.08 g $$CO_2$$. What is the empirical formula of the hydrocarbon?
NTA JEE Main 7th April 2013 Online - Question 35
Energy of an electron is given by $$E = -2.178 \times 10^{-18}\left(\frac{Z^2}{n^2}\right)$$ J. Wavelength of light required to excite an electron in a hydrogen atom from level n=1 to n=2 will be :
$$(h = 6.62 \times 10^{-34}$$ Js and $$c = 3.0 \times 10^8$$ ms$$^{-1})$$
NTA JEE Main 7th April 2013 Online - Question 36
The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na$$^+$$ will be :
NTA JEE Main 7th April 2013 Online - Question 37
Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar ?
NTA JEE Main 7th April 2013 Online - Question 38
Stability of the species $$Li_2$$, $$Li_2^-$$ and $$Li_2^+$$ increases in the order of
NTA JEE Main 7th April 2013 Online - Question 39
Which one of the following molecules is expected to exhibit paramagnetic behaviour?
NTA JEE Main 7th April 2013 Online - Question 40
In which of the following pairs of molecules/ions, both the species are not likely to exist?
