Multiple Choice Questions20 mL of 0.5 N HCl and 35 mL of 0.1 N NaOH are mixed. The resulting solution will :
be neutral
be basic
turn phenolphthalein solution pink
turn methyl orange red
The cooling in refrigerator is due to :
the reaction of the refrigerator gas
the expansion of ice
the expansion of the gas in the refrigerator
the work of the compressor
In an exothermic equilibrium ,
A + 3B AB3
all the reactants and products are in gaseous state. The formation of AB3 is favoured at :
low temperature and low pressure
low temperature and high pressure
high temperature and high pressure
high temperature and low pressure
A bivalent metal has an equivalent mass of 32. The molecular mass of the metal nitrate is :
182
168
192
188
The line spectrum of He+ ion will resemble that of :
hydrogen atom
Li+ ion
helium atom
lithium atom
0.5 mole of each of H2 , SO2 and CH4 are kept in a container. A hole was made in the container . After 3h , the order of partial pressures in the container will be :
pSO2 > pH2 > pCH4
pSO2 > PCH4 > pH2
pH2 > pSO2 > pCH4
pH2 > pCH4 > pSO2
An evacuated glass vessel weighs 50 g when empty, 144.0 g when filled with a liquid of density 0.47 g mL-1 and 50.5 g when filled with an ideal gas at 760 mm Hg and 300 K. The molar mass of the ideal gas is :
[R = 0.0821 L atm K-1 mol-1]
61.575
130.98
123.75
47.87
A body of mass x kg is moving with a velocity of 100 ms-1. Its de-Broglie wavelength is 6.62 x 10-35 m. Hence, x is :
[h = 6.62 x 10-34Js]
0.1 Kg
0.25 Kg
0.15 Kg
0.2 Kg
A precipitate of AgCl is formed when equal volumes of the following are mixed :
[Ksp for AgCl = 10-10]
10-4 M AgNO3 and 10-7 M HCl
10-5 M AgNO3 and 10-6 M HCl
10-5 M AgNO3 and 10-4 M HCl
10-6 M AgNO3 and 10-6 M HCl
B.
10-5 M AgNO3 and 10-6 M HCl
For the precipitation of an electrolyte, it is necessary that the ionic product must exceed its solubility product. A precipitate of AgCl is formed when equal volumes of 10-5 M AgNO3 and 10-5 M HCl are mixed, because ionic product will be 10-9 which is greater than Ksp (10-10).
Pick out the incorrect statement from the following :
sp hybrid orbitals are equivalent and are at an angle of 180° with each other
sp2 hybrid orbitals are equivalent and bond angle between any two of them is 120°
sp3d2 hybrid orbitals are equivalent and are oriented towards corners of a regular octahedron
dsp2 hybrid orbitals are equivalent with a bond angle of 90° between the two atoms
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