List of practice Questions

If $60\%$ of a first order reaction was completed in $60\, min$, $50\%$ of the same reaction would be completed in approximately ($log\, 4 = 0.60 \,log\, 5 = 0.69$)
The reaction of hydrogen an iodine monochloride is given as $H _{2( g )}+2 ICl _{( g )} \rightarrow 2 HCl _{( g )}+ I _{2( g )}$ This reaction is of first order with respect to $H _{2( g )}$ and $ICl _{( g )}$, following mechanisms were proposed Mechanism $A$: $H _{2( g )}+2 ICl _{( g )} \rightarrow 2 HCl _{( g )}+ I _{2( g )}$ Mechanism $B$ : $H _{2( g )}+ ICl _{( g )} \rightarrow HCl _{( g )}+ HI _{( g )} ;$ Slow $HI _{( g )}+ ICl _{( g )} \rightarrow HCl _{( g )}+ I _{2( g )} ;$ Fast Which of the above mechanism $(s)$ can be consistent with the given information about the reaction:
An element, $X$ has the following isotopic composition; ${ }^{200} X : 90 \%$ ${ }^{199} X : 8.0 \%$ ${ }^{202} X : 2.0 \%$ The weighted average atomic mass of the naturally-occurring element $X$ is closest to:
Which one is formed by ossification of tendon ?
In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in $F_1$ generation ?
The limit of resolution of an optical instrument arises on account of
An electric dipole coincides on $Z$-axis and its midpoint is on origin of the coordinate system. The electric field at an axial point at a distance $z$ from origin is $E_{(z)}$ and electric field at an equatorial point at a distance y from origin is $ E_{( y)} $. Here $ z = y > a, \, so \, \bigg | \frac{ E_{ (z) }}{ E_{(y)}} \bigg | = $ ...
To increase the charge on the plate of a capacitor means to
Sound waves in air cannot be polarized because
A stationary bomb explodes into two parts of masses in the ratio of $ 1:3 $ . If the heavier mass moves with a velocity $ 4\,m/s, $ what is the velocity of lighter part?
The colour of transition metal ions is due to presence of unpaired electron transitions in available empty electron in
A dielectric of dielectric constant $K$ is introduced such that half of its area of a capacitor of capacity $C$ is occupied by it. The new capacity is
When a metal conductor connected to the left gap of a meter bridge is heated, the balancing point
If distance between earth and sun become four times then time period becomes
Which of the following has the smallest number of molecules?
Which one of the following compounds has $ s{{p}^{2}} $- hybridisation?
Number of lone pair (s) in $ XeO{{F}_{4}} $ is/are
The decomposition of hydrogen peroxide can be slowed by the addition of acetamide. The latter acts as a
The starting material used in Solvas process are
The ninth term of the expansion $\left(3x-\frac {1}{2x}\right)^8$ is
The number of gram molecules of chlorine in $6.02 \times 10^{25}$ hydrogen chloride molecules is -
Archaeopteryx is connecting link between
Edaphology is
Benzene reacts with chlorine in sunlight to give a final product
A vector perpendicular to the plane containing the points $A (1, -1, 2), B (2, 0, -1), C (0,2,1)$ is