An element X has the following isotopic Composition ²⁰⁰X = 90%, ¹⁹⁹X = 8% and ²⁰²X = 2%. The Weighted average atomic mass of the element X is closet to _________.

When 6.3 g of sodium bicarbonate is added to 30 g of the acetic acid solution, the residual solution is found to weigh 33 g. The number of moles of carbon dioxide released in the reaction is _____.

Fe2 + \(\longrightarrow\) Fe³⁺ + e^- is a ________ reaction.

7.5 g of a gas occupies a volume of 5.6 litres at 0° C and 1 atm pressure. The gas is ________.

Among the three metals, zinc, copper and silver, the electron releasing tendency decreases in the following order.

What do you understand by the term mole ?

Distinguish between oxidation and reduction.

Give a brief account of classification of matter.

Calculate the equivalent masses of the following - HNO₃

Calculate the oxidation number of underlined atoms of the following:
Na₂[Fe(CN)₆]

Mass of one atom of an element is 6.645 x 10^-23g. How many moles of element are there in 0.320 kg.

What is the most essential conditions that must be satisfied in a redox reaction?

Calculate the empirical and molecular formula of a compound containing 76.6% carbon, 6.38 % hydrogen and rest oxygen its vapour density is 47.

Mixture of salt and water is a solution while that of oil and water is not. Explain

Calculate the mass of the following : 1 atom of silver

A Compound on analysis gave Na = 14.31% S = 9.97% H = 6.22% and 0 = 69.5%.
Calculate the molecular formula of the compound if all the hydrogen in the compound is present in combination with oxygen as a water of crystallization. (molecular mass of the compound is 322).

Write note on decomposition reaction

Balance the following equations by oxidation number method.
P + HNO₃ ⟶ HPO₃ + NO + H₂O

An organic compound was found to contain carbon = 40.65%, hydrogen = 8.55% and Nitrogen = 23.7%. Its vapour density was found to be 29.5.
What is the molecular formula of the compound?