NTA JEE Main 9th April 2014 Online
For the following questions answer them individually
NTA JEE Main 9th April 2014 Online - Question 31
Dissolving 120 g of a compound of (mol. wt. 60) in 1000 g of water gave a solution of density 1.12 g/mL. The molarity of the solution is:
NTA JEE Main 9th April 2014 Online - Question 32
The amount of oxygen in 3.6 moles of water is:
NTA JEE Main 9th April 2014 Online - Question 33
The energy of an electron in first Bohr's orbit of H atom is $$-13.6$$ eV. The energy value of electron in the first excited state of Li$$^{2+}$$ is:
NTA JEE Main 9th April 2014 Online - Question 34
In the following sets of reactants which two sets best exhibit the amphoteric character of Al$$_2$$O$$_3$$ · xH$$_2$$O?
Set I: Al$$_2$$O$$_3$$ · xH$$_2$$O$$_{(s)}$$ + OH$$^-_{(aq)}$$
Set II: Al$$_2$$O$$_3$$x · H$$_2$$O$$_{(s)}$$ + H$$_2$$O$$_{(l)}$$
Set III: Al$$_2$$O$$_3$$x · H$$_2$$O$$_{(s)}$$ + H$$^+_{(aq)}$$
Set IV: Al$$_2$$O$$_3$$ · xH$$_2$$O$$_{(s)}$$ + NH$$_{3(aq)}$$
NTA JEE Main 9th April 2014 Online - Question 35
The number and type of bonds in C$$_2^{2-}$$ ion in CaC$$_2$$ are:
NTA JEE Main 9th April 2014 Online - Question 36
Which of the following has unpaired electron(s)?
NTA JEE Main 9th April 2014 Online - Question 37
The temperature at which oxygen molecules have the same root mean square speed as helium atoms have at 300 K is: (Atomic masses: He = 4 u, O = 16 u)
NTA JEE Main 9th April 2014 Online - Question 38
Van der Waal's equation for a gas is stated as, $$P = \frac{nRT}{V - nb} - a\left(\frac{n}{V}\right)^2$$. This equation reduces to the perfect gas equation, $$P = \frac{nRT}{V}$$ When,
NTA JEE Main 9th April 2014 Online - Question 39
The standard enthalpy of formation of NH$$_3$$ is $$-46.0$$ kJ/mol. If bond enthalpy of H$$_2$$ is $$-436$$ kJ/mol and that of N$$_2$$ is $$-712$$ kJ/mol, the average bond enthalpy of N$$-$$H bond in NH$$_3$$ is:
NTA JEE Main 9th April 2014 Online - Question 40
At a certain temperature, only 50% HI is dissociated into H$$_2$$ and I$$_2$$ at equilibrium. The equilibrium constant is:
