List of practice Questions

Among the following the correct statements are
I. Germanium exists only in traces
II. PbF4 molecule is tetrahedral in shape
III. GeX2 is more stable than GeX4

Match the following molecules with their dipole moments:

List IList II
\( \mathrm{H_2O} \)I. 0
\( \mathrm{BF_3} \)II. 0.23
\( \mathrm{NH_3} \)III. 1.47
\( \mathrm{NF_3} \)IV. 1.85
Which of the following is the correct order of increasing number of lone pair of electrons on the ntral atom?

Which of the following statements are correct?
LiF is less soluble in water
NaCl is less ionic than CsCl
Formation of alkali metal halide is an endothermic reaction

In D-glucose and D-fructose, which OH participates in hemiatal/hemiketal formation?
In OF\(_2\), the number of bond pairs and lone pairs of electrons are respectively:
Which one of the following molecular hydrides acts as a Lewis acid?
The conductivity of a weak acid HA of concentration 0.001 mol L\(^{-1}\) is \( 2.0 \times 10^{-5} \, \text{S cm}^{-1} \). If \( \Lambda_m^\circ ({HA}) = 190 \, \text{S cm}^2 \text{mol}^{-1} \), the ionization constant (\( K_a \)) of HA is equal to _______ \( \times 10^{-6} \).
As shown in figure, a cuboid lies in a region with electric field \(E=2 x^2 \hat{i}-4 y \hat{j}+6 \hat{k} N / C\). The magnitude of charge within the cuboid is \(n \epsilon_0 C\). The value of \(n\) is _____. (if dimension of cuboid is \(1 \times 2 \times 3 m ^3\) )
A cuboid electric Field
An ac source is connected to a capacitor C. Due to decrease in its operating frequency:
A point source of $100 \,W$ emits light with $5 \%$ efficiency At a distance of $5\, m$ from the source, the intensity produced by the electric field component is:
For $z \in C$ if the minimum value of $(| z -3 \sqrt{2}|+| z - p \sqrt{2} i |)$ is $5 \sqrt{2}$, then a value of $p$ is ______
The function \(y=e^{kr}\) satisfies \((\frac{d^2y}{dx^2}+\frac{dy}{dx})(\frac{dy}{dx}-y)=y\frac{dy}{dx}\). It is valid for 
Place of Mother in Society
Write a letter to the Editor of a national daily showing your concern over increasing ‘Price Rise’.
Rohit Company Limited was registered with the capital of Rs. 5,00,000, which was divisible @ Rs. 10 in 50,000 shares. The company issued 40,000 shares out of them, on which Rs. 2 per share on application, Rs. 2 per share on allotment, Rs. 4 per share on 1st call and Rs. 2 per share on final call were payable. The public purchased all shares and the amounts were received. However, one shareholder who held 500 shares did not pay the amount of final calls. The directors forfeited these shares and reissued them @ Rs. 6 per share.
Pass necessary journal entries in the books of the company.
Let (an) be a sequence of real numbers such that the series \(\sum\limits_{n=0}^{\infin}a_n(x-2)^n\) converges at x = −5. Then this series also converges at

If ${ }^{2 n+1} P _{n-1}:{ }^{2 n-1} P _n=11: 21$, then $n^2+n+15$ is equal to :

Receipts and Payments Account is
Let the point $P(\alpha, \beta)$ be at a unit distance from each of the two lines $L _1: 3 x -4 y +12=0$, and $L _2: 8 x +6 y +11=0$ If $P$ lies below $L _1$ and above $L _2$, then $100(\alpha+\beta)$ is equal to
The relation between focal length (f) and radius of curvature (R) of a spherical mirror is
For a wavelength 670 nm of light coming from a galaxy moving with velocity $V$, the observed wavelength is 670.7 nm. The value of $V$ is
Light enters from air into a given medium at an angle of \( 45^\circ \) with interface of the air-medium surface. After refraction, the light ray is deviated through an angle of \( 15^\circ \) from its original direction. The refractive index of the medium is
A standing wave having 3 nodes and 2 antinodes is formed between two atoms separated by a distance of \( 1.21 \, \text{\AA} \). The wavelength of the wave is:
Telescope has objective diameter 250 cm. For wavelength \( \lambda = 600 \, \text{nm} \), the limit of resolution is: