The structural formula of 2-methyl 2-butene is .......
Ethyl bromide on treatment with alocoholic KOH gives
The first emission line in the atomic spectrum of hydrogen in the Balmer series appears at
Which one of the following is not an isoelectronic pair
The atomic number of an element is 35. What is the total number of electrons present in all the p-orbitals of the ground state atom of the element
The homologue of ethyne is
C2H2 is Ethyne (homologue of alkyne)
C3H4 is propyne (homologue of alkyne)
C3H8 → propane (homologue of alkane)
C2H6 → Ethane (homologue of alkane)
A one litre flask is full of brown bromine fumes. The intensity of brown colour of vapour will not decrease appreciably on adding to the flask some
The hybrid state of I in IF₅ is
Which is most ionic?
For a given reaction t1/2 = (1/ka). The order of reaction is
In a reversible reaction, the catalyst
The law formulated by Nernst is
The compound with carbon uses only its sp3 hybrid orbitals for bond formation is
The bond dissociation energies of H₂,Cl₂ and HCl are 104, 58 and 103 kcal respectively. The enthalpy of formation of HCl gas will be
The free energy change (∆Go) is negative when
An ester used as medicine is
The IUPAC name of is
Which pair of atomic numbers represent elements which are both s-block elements
Lithium (atomic number-3) is an alkali metal and magnesium (atomic number-12) is an alkaline earth metal.
Which of the following is an example of a double salt?
What will be the e.m.f. of the given cell?
Pt | H2(P1)| H+(aq)|H2(P2)|Pt
At which one of the following temperature-pressure conditions, the deviation of a gas from ideal behaviour is expected to be minimum ?
300 ml of a gas at 27oC is cooled to -3oC at consatnt pressure, the final volume is
The strongest reducing agent of the alkali metal is
What is the molecular formula of Borazole?
Glass is a
C and Si have
What causes nitrogen to be chemically inert ?
What is the hydrization of S in SF₄ ?
Ozonised oxygen can be obtained from H₂O by the action of
Alkaline earth metals form ions of the formula
An acid solution of pH 6 is diluted hundred times. The pH of solution becomes approx.
When same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide solution the ratio of volumes of hydrogen evolved is
The Ksp of CuS,Ag₂S and HgS are 10⁻31, 10⁻44, 10⁻54 respectively.
The solubility of these sulphides are in the order
FeCl₃ solution is
Isomers of propionic acid are
HCOOH reacts with conc.H₂SO₄ to produce
The decay constant of a radioactive sample is 'λ'. The half-life and mean life of the sample are respectively
The half life period of a radioactive material is 15 minutes. What percent of radioactivity of that material will remain after 45 minutes?
Which of the following compounds gives a ketone with Grignard reagent?
The reagent used to convert Ethanoic acid to Ethanol is
Which one of the following is reduced with Zn and HCl to give the corresponding hydrocarbon?
What is formed when a primary alcohol undergoes catalytic dehydrogenation?
Most stable alkene is :
Which of the following complexes is likely to show optical activity?
Which gives more stable product ?
Phenol is heated with CHCl₃ and alcoholic KOH when salicylaldehyde is produced. This reaction is known as
Ziegler-Natta catalyst is
On analysis ,a saturated hydrocarbon is found to contain 83.70% carbon and 16.30% hydrogen .The empirical formula will be (At.wt.of C = 12; At.wt.of H = 1) ?
C : H ratio is 83.70/12 : 16.30/1 or 6.975 : 16.30 or 1 : 2.33 or 3 : 8.
Hence empirical formula is C3H8
When iron or zinc is added to CuSO₄ solution, copper is precipitated. It is due to
The oxidation number of Mn in KMnO₄ is
At a given temperature, the vapour pressure of pure A and B is 108 and 36 torr respectively. What will be the mole fraction of B in the vapour phase whih is in equilibrium with a solution containing equimole fraction of A and B, under ideal behaviour conditions ?
A f.c.c. crystal contains how many atoms in each unit cell?
Very dilute solutions which show deviations (positive or negative) from Raoult's law are called
Which of the following compounds can show optical isomerism?
A compound contains 28% nitrogen and 72% of a metal by weight.If 3 atoms of the metal combine with 2 atoms of nitrogen, then atomic weight of the metal is
The colloidal sols are purified by
The calculated magnetic moment (in Bohr magnetons) of Cu+2 ion is
When a copper wire is dipped into silver nitrate solution, the solution gradually becomes blue. The reason for this is