Question Library

It is also called weak iodine solution. Tincture solutions are characterized by the presence of alcohol.

Permanent hardness in water= Mg & Ca Sulphate. Temporary hardness in water= Mg & Ca Carbonate. Temporary hardness of water is caused by Magnesium and calcium hydrogencarbonate. It is formed when rainwater containing dissolved CO2 flows over deposit of CaCO3 i.e CaCO3 + CO2 + H2O → Ca(HCO3)2

H2CO3 is an example of a weak acid while H2SO4 and HNO3 are examples of a strong acid. CO2 combines with water to give a weak trioxocarbonate (IV) acid. CO2 + H2O → H2CO3

Resonance involves two forms of a compound. Isomerism involves two or more forms of an element. Reforming involves the rearrangement of molecule. This deals with a two forms of a molecule where the chemical connectivity is the same but the electrons are distributed differently around the structure.

To purify the distillate of impurities like unreacted ethanol, acids, water and ethoxyethane. Adding anhydrous calcium chloride and leave it to stand for a day to remove any water present in the mixture.

Rust is an iron oxide, a usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture.

Expression for equilibrium constant k = \(\frac{\text{concentration of product}}{\text{concentration of reactant}}\)

At constant pressure connotes Charle's law \(\frac{V_1}{T_1}\) = \(\frac{V_2}{T_2}\) \(\frac{2dm^3}{300k}\) = 2 x \(\frac{2dm^3}{T_2}\) T2= 600k

If the rules are followed, it is non-negotiable that +5 is the suitable answer to the question.

At high temperature and low pressure, the vanderwaal equation is reduced to ideal gas equation. i.e, [P + \(\frac{a}{v^2}\)] [v - b] = RT is reduced to PV = nRT Generally, a gas behaves more like an ideal gas at higher temperature and lower pressure as the potential energy due to intermolecular forces, it becomes less significant compared with the particles kinetic energy and the size of the molecules, then it becomes less significant compared to the empty space between them.

When ΔH is negative, heat is liberated to the surrounding and it connotes an exothermic reaction. ΔH = −ve

\(^{226}_{88}Ra\) → \(^x_{86}Rn\) + \(^4_{2}He\) \(^4_{2}He\) = alpha particle considering the summation of the mass number 226 = x + 4 x = 226 - 4 x = 222

The ammonia (NH\(_3\)) molecule has a trigonal pyramidal shape, with the three hydrogen atoms and the nitrogen atom forming a pyramid, and a lone pair of electrons on the nitrogen atom. Trigonal pyramidal and trigonal planar are distinct molecular geometries; trigonal planar has three atoms bonded to a central atom in a flat, triangular arrangement, while trigonal pyramidal has three atoms and one lone pair around the central atom, resulting in a pyramid shape.

Recall that mass deposited = \(\frac{MmIt}{96500n}\) Mm =108, t = 4830s I = 10A, n = 1 m = 108 \times 10 \times (\(\frac{4830}{96500}\)) \times 1 m = 54.0g

C5H12 has 5 carbons acid 12 hydrogens. 2–methyl butane No of carbon=5 No of hydrogen=12