Calculate the mass of urea \((NH_2CONH_2)\) required to prepare \(2.5\ kg\) of a \(0.25\ molal\) aqueous solution.

Read the passage carefully and answer the Questions
A homogeneous mixture of two or more than two components has uniform composition and properties. The binary solutions have two components, which may be solid, liquid or gas. The resultant solution has a larger amount of solvent and a smaller amount of solute. The amount of solute in a given amount of solvent decides the concentration of the resulting solution. The concentration can be expressed in various ways, like molarity, molality, normality and mole fraction. The molality of a 1 liter aqueous solution of \(93 \backslash \% H _2 SO _4\) (mass/volume) is:
(Given: density of the solution \(=1.84 g mL ^{-1}\), molar mass of \(\left.H _2 SO _4=98 g mol ^{-1}\right)\)

Gluconic acid is obtained when

Match List-l with List-II

List-I	List-II
(A) Kolbe's reaction	(I) Preparation of symmetrical and unsymmetrical ethers
(B) Williamson synthesis	(II) Preparation of Salicylic acid
(C) Lucas test	(III) Organo-Magnesium halide
(D) Grignard's reagent	(IV) Distinction between different types of alcohols

Choose the correct answer from the options given below:

What is the product of the following reaction?
\(R-CN \frac{H_2 / Nl}{Na\left(H_{g}\right) / C_2 H_6 OH}\)
The options are:

How many C \(\text{mol}^{-1}\) are required to convert 1 mol of \(\text{MnO}_4^-\) to \(\text{Mn}^{2+}\)?
[1F = 96500 C]

The major product formed when acetanilide undergoes bromination in presence of acetic acid is:

The incorrect statement about rubber is :

Which one of the following statements is not correct regarding the DNA?

In a single slit diffraction experiment, the aperture of the slit is 3 mm. A monochromatic light of wavelength 620 nm is normally incident on the slit. If the distance between the slit and the screen is 1.2 m, then the separation between the first order minima and the third order maxima on one side of the screen is

Four equal charges \(Q\) are placed at the four corners of a square of side 'a'. Work done in removing a charge \(-Q\) from its centre to infinity is :

Which of the following statements regarding Genetically Modified Organisms are not correct?
(A) Crops are more tolerant to abiotic stresses
(B) Pest-resistant crops
(C) Post harvest losses are more
(D) Reduced efficiency of mineral usage by plants
Choose the correct answer from the options given below:

When an insect feeds on the Bt plant, the insect dies due to the conversion of inactive protein to active protein in: