3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06 N) in a flask. After an hour it was filtered and the strength of the filtrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is :
Which of the following atmospheric gases constitute greenhouse gases?
(1) Carbon dioxide (2) Nitrogen
(3) Nitrous oxide (4) Water vapour
Select the correct answer using the codes given below:
The correct order of these fuels in terms of their
calorific value in increasing order is
(1) Hydrogen gas (2) Kerosine oil
(3) Charcoal (4) Wood
Heating mixture of Cu2O and Cu2S will give:
The term PVC used in the plastic industry stands for:
Which of the following is also known as wood alcohol?
Due to rusting the weight of iron:
The chemical used as a fixer in photography is ?
Which one of the following methods is neither meant for the synthesis nor for separation of amines?
The high reactivity of fluorine is due to:
Elements that show the properties of both metals and non metals are called ?
Domestic cooking gas consists of mostly:
As per Bohr model, the minimum energy (in eV ) required to remove an electron from the ground state of doubly ionized Li atom (Z = 3 ) is:
The ore which is found in abundance in India is:
A sample of chloroform before using as an anaesthetic, is tested by
Chlorophyll molecules act as both donors and acceptors in fluorescence resonance energy transfer. The fluorescence lifetime of chlorophyll molecules in a dilute solution of an organic solvent wa found to be 1.2 ns. When chlorophyll molecules were instead embedded in a biopolymer, the fluorescence lifetime was measured to be 820 ps. Given that R0 = 5.6 nm for chlorophyll molecules, estimate the separation between the donor-acceptor pairs in the polymer.
Elimination of bromine from 2-bromobutane results in the formation of-
Three of the most common states of matter are solids, liquids, and gases. A liquid has:
Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl:
Consider the following statements : (i) Washing soda on strong heating gives sodium oxide and carbon dioxide.
(ii) Plaster of Paris is obtained by heating gypsum at 373 K.
(iii) Bleaching powder is used for disinfecting drinking water.
Which of these statement(s) is/are correct ?
Acid rain is due to air pollution by ?
The Latin word formica means ant. The name formic acid is derived from this Latin word because:
Which of the following cannot be emitted by radioactive substances during their decay ?
Which one is an organic Acid ?
If we consider that 1/6 in place of 1/12 mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will:
What is the chemical name of table salt ?
The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is:
Which metal is heaviest ?