List of practice Questions

Which element out of He, Ar, Kr and Xe formsleast number of compounds ?
Two gases, ammonia and hydrogen chloride, are passed in a long glass tube from opposite ends. The white ring will be formed at:
Three of the six vertices of a regular hexagon are chosen at rondom. The probability that the triangle with three vertices is equilateral, equals
The volume of carbon dioxide gas evolved at S.T.P. by heating $7.3\, gm$ of $Mg \left( HCO _{3}\right)_{2}$ will be
The tension in piano wire is $10 \,N$.What should be the tension in the wire to produce a note of double the frequency?
The rotenone is
The restriction enzymes are used in genetic engineering, because
The reactance of an inductance of $0.01\, H$ to a $50 \,Hz$ A.C. is
The radius vector, drawn from the Sun to a planet sweeps out equal areas in equal lines. This is the statement of
The power factor varies between
The polyembryony commonly occurs in
The oxidation number of oxygen atom in $O^{2-}_2$ ion is
The number of unpaired electron in Ni2+ is ?
The number of unpaired electrons in ferrous ion(Z = 26) is
The law of mass action was given by
The lac operon is an example of
The important ore of aluminium is
The incomplete combustion of $CH_4$ gives
The heat produced by a $100\, W$ heater in $2\, min$. is equal to
The element, with atomic number $118$, will be
The 3 sub-families of leguminosae are distinguished mainly on the basis of
Raphides are the crystals of
Nessler?? reagent is used in the test of
Lining of intestine of man is
Let z and w be two complex numbers such that $|z| \le 1, |w | \le 1$ and $|z + i w |= | z - \overline {iw}| = 2$ , then z equals