List of practice Questions

The coordination number of $Sr^{2+}$ ion in $SrF_2$, if ionic radii are r $(Si^{2+})$ = 113 pm and r $(F^-)$ = 136 pm; is
The core of electromagnet is made of soft iron, because a) the susceptibility of soft iron is very high b) coercivity of soft iron is very low
The contrapositive of "if two triangles are congruent then they are similar" is
The contrapositive of statement 'If Chandigarh is capital of Punjab, then Chandigarh is in India' is
The contrapositive of the statement "If 7 is greater than 5, then 8 is greater than 6" is
The conjugate base of $HPO^{2-}_4$ is
The constant $k$ in Coulombs law depends on
The constituent particles of a solid have
The conductivity of a superconductor is
The conductivity of intrinsic semiconductors can be increased by adding a suitable impurity. This process is called $(P)$. This can be done with an impurity which is $(Q)$ rich or deficient as compared to the semiconductor. Such impurities introduce $(R)$ defects in them. Electron rich impurities result in $(S)$ type semiconductors while electron deficit impurities result in $(T)$ type semiconductors.
The configuration $1s^2 \,2s^2\, 2p^5\, 3s^1$ shows
The conduction current is same as displacement current when source is
The conductivity of 0.001028 mol $ L^{-1}$ acetic acid is 4.95 ? $10^{-5} S cm^{-1}.$ Calculate its dissociation constant if $\wedge_{m}^{??$ for acetic acid is $390.5 S cm^{2} mol^{-1}.$
The concept of displacement current was given by
The concept of Joint Forest Management $(JFM)$ involves
The condition for the lines $lx+ my + n = 0$ and $ l_1x + m_1y + n_1 = 0$ to be conjugate with respect to the circle $ x^2 + y^2 = r^2 $ is
The compounds $CH_3NH_2$ and $ CH_3CH_2NH_2$ are :
The compressibility factor, Z for $H_2$ and He is
The compound in which C uses its $sp^3$ hybrid orbitals for bond formation is :
The compound iodine monofluoride (IF) would dissolve best in,
The compound 1-(N-ethyl-N-methyl) propanamine forms non-superimposable mirror images. But this compound does not show optical acitivity because
The compound which possesses the antifluorite structure is
The component present in both nucleotides and nucleosides is
The composition of common baking powder is
The composition of the common glass is