A pressure vessel contains a gaseous mixture made up of 2.34 kg silane, SiH4, and 55.4 kg argon. Determine the mole fraction of silane.
What is the general formula of Alkanes?
Consider the spectral line resulting from the transition n = 2n = 1 in the atoms and ions given below. The shortest wave length is produced by:
The root-mean-square distance between the ends of a polymer chain was found to be 6.2 nm. Estimate the number of monomers in the chain, given that the length of each monomer unit is 2.1 Å.
Which among the following is the objective of the Methyl tert-butyl ether (MTBE) mixing with Petroleum?
The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is:
Biogas majorly contains ?
Which of the following gas is used in cigarette lighters ?
Which of the following is correct?
Hubble’s law is based on the:
Which among the following happens in an oxidation reaction ?
Who proposed first atomic theory ?
The partial pressure of a component in a gas-phase reaction is 0.452 atm. What is the activity of the component?
Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotised and then heated with cuprous bromide. The reaction mixture so formed contains:
Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point.
Hydrofluoric acid is not kept in glass bottles because it reacts with:
Electrons with energy 80 keV are incident on he tungsten target of an X-ray tube. K-shell electrons of tungsten have - 72.5 contain only k.v energy. X-rays emitted by the tube:
The acid generally stored in batteries is:
The standard Gibbs energy change at 300 K for the reaction 2A B + C is 2494.2 J. At a given time, the composition of the reaction mixture is [A] = 1/2, [B] = 2 and [C] = 1/2. The reaction proceeds in the :[R = 8.314 J/K/mol, e = 2.718]:
The isotope atoms differ in ?
Which of the following oxides is amphoteric in character?
A radioactive sample at any instant has its disintegration rate of 5000 disintegrations per minute. After 5 minutes, the rate is 1250 disintegrations per minute. The decay constant per minute is:
The IUPAC name of the coordination compound K3[Fe(CN)6] is:
The lanthanide contraction is responsible for the fact that:
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
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The graphite rods in the nuclear reactor:
Which of the following is/are not use(s) of glycerol. Glycerol is used?
(1) As a sweetening agent in beverages and confectionery
(2) As an antifreeze in automobile radiators
(3) As a lubricant for heavy machinery
(4) For preparation of better quality of soaps and cosmetics.
Which of the following statements in relation to the hydrogen atom is correct?
The chemical used as a fixer in photography is ?
When soggy biscuits are kept inside the fridge for sometime they become crisp because: