Chemistry

2.4g coal is burnt in a bomb calorimeter in excess of oxygen at 298 K and 1 atm pressure. The temperature of the calorimeter rises from 298 K to 300 K. The enthalpy change during the combustion of coal is -x kJ mol^-1. The value of x is ____________.

(Given : Heat capacity of bomb calorimeter 20.0 kJ K^-1. Assume coal to be pure carbon)

The wavelength of an electron and a neutron will become equal when the velocity of the electron is x times the velocity of neutron. The value of x is ___________. (Nearest Integer)

(Mass of electron is 9.1 * 10^-31kg and mass of neutron is 1.6 * 10^-27kg)

A mixture of hydrogen and oxygen contains 40% hydrogen by mass when the pressure is 2.2 bar. The partial pressure of hydrogen is __________ bar. (Nearest Integer)

Chlorophyll extracted form the crushed green leaves was dissolved in water to make 2 L solution of Mg of concentration 48 ppm. The number of atoms of Mg in this solution is x * 10²⁰ atoms. The value of x is _____________. (Nearest Integer)

(Given : Atomic mass of Mg is 24 g mol^-1; N_A = 6.02 * 10²³ mol^-1)

Given below are two statements : one is labeled as Assertion (A) and the other is labeled as

Reason (R).

Assertion (A): Experimental reaction of CH₃Cl with aniline and anhydrous AlCl₃ does not give O and P-methylaniline.

Reason (R) : The -NH₂ groups of aniline becomes deactivating because of salt formation with anhydrous AlCl₃ and hence yields m-methyl aniline as the product.

In the light of the above statements, choose the most appropriate  answer from the options given below:

Which one of the following is a reducing sugar?

How many of the following drugs is/are example(s) of broad spectrum antibiotics?

Ofloxacin, Penicillin G, Terpineol, Salvarsan.

Stearic acid and polyethylene glycol react to form which one of the following soap/s etergents?

A 100 mL solution of CH₃CH₂MgBr on treatment with methanol produces 2.24 mL of a gas at STP. The weight of gas produced is __________ mg. [nearest integer]

The correct stability order of the following diazonium salt is