An organic compound 'X' on treatment with acidified K₂Cr₂O₇ gives a compound 'Y' which reacts with I₂ and sodium carbonate to form triodomethane. The compound 'X' could be
The order of reactivity of halogen acids for reaction with C₂H₅OH is
As the nuclear charge increases from neon to calcium, the orbital energies
After neon the next electron enters into 4s orbital which is lower in energy than 3d orbitals
Which of the following element's outermost orbits last electron has magnetic quantum number m = 0?
The rate of forward reaction is two times that of the reverse reaction at a given temperature and identical concentration, K equilibrium is
Oxygen molecule (O₂) has
Which of the followng acts to inhibit lutenizing hormone secretion?
There are two gonadotrophic hormone: follicle stimulating hormone (FSH) and luteinizing hormone (LH), in both males and females. In males, FSH promotes spermatogenesis in the seminiferous tubules, which also release the hormone inhibin. Inhibin acts to inhibit luteinizing hormone secretion by the anterior pituitary gland
Which of the following compounds on boiling with KMnO₄ and the subsequent acidification will not give benzoic acid ?
In DNA the complementary beses are
Which of the following salt can be produced by the reaction of CO and caustic soda ?
A gas bulb is filled with NO₂ gas and imersed in an ice bath at 0°C which becomes colourless after sometime. This colourless gas will be
After how many seconds, will the concentration of reactants be halved, if the rate constant is 1.155 x 10⁻3 s⁻1?
For a process to be spontaneous
The I.P. of an element on going from left to right in a period
As we move from left to right in a period, the ionisation potential increases with increasing atomic numbers. This is because across a period the nuclear charge increases though the principal quamtum number of the valence shell remains the same. As a result, the valence electrons are more and more tightly held by the nucleus. Consequently, more energy is needed to remove the electrons and hence ionisation potential keeps on increasing.
The lightest metal is
Lithium is lightest among all the metals with density 0.534 g/cm3.
A graph plotted between log k versus 1/T for calculating activation energy is shown by
Bio-gas production is more useful as compared to the direct use of cow dung because
Detergents are prepared by the action of H₂SO₄ followed by neutralization by starting with
The geometrical isomerism is shown by
Geometrical isomerism is observed when different groups are attached to doubly bonded carbon atoms. Hence, only shows geometrical isomerism.
The oxidation no. of Cr in [Cr(NH₃)₆]Cl₃ is
The voltage of a cell, whose half cells are given below is Mg++ + 2e- → E = -2.37V, Cu++ + 2e- → Cu(s) E = + 0.34V
Flux is used to
The chemical composition 'slag' formed during smelting process in the extraction of copper, is
The standard reduction potentials at 25°C of Li⁺/Li, Ba2⁺/Ba, Na⁺/Na and Mg2⁺/Mg are -3.05, -2.73, -2.71 and -2.37 volt respectively. Which one of the following is the strongest oxidising agent?
Electronic configuration of calcium atom may be written as
Fractional distillation of coal-tar produces the following fractions. Phenol is the main component of which fraction?
Propyne and propene can be distinguished by
Which one of the following substances is used in the laboratory for a fast drying of neutral gases?
The term pH comes from
A nuclide of an alkaline earth metal undergoes radioactive decay by the emission of α particles in succession. The Group of the Periodic Table, to which the resulting daughter element would belong, is
Which of the following does not contain material particles?
The phenomenon of radioactivity arises from the
If methyl bromide and ethyl bromide are mixed in equal proportions and the mixture is treated with sodium, the number of possible alkanes formed is
A Beckmann rearrangement is affected by
Which of the following is strongest Bronsted acid?
Number of electrons shared in the formation of nitrogen molecule is
Moderate electrical conductivity is shown by
Which one of the following oxides is neutral?
At T(K) 100 litres of dry oxygen is present in a sealed container. It is subjected to silent electric discharge, till the volumes of oxygen and ozone become equal. What is the volume (in litres) of ozone formed at T(K)?
Nylon-66 is made by using
In which of the following complexes, oxidation state of metal is zero ?
By increasing the temperature of a liquid, its vapour pressure
Vant Hoff's factor of Ca(NO₃)₂ is
A liquid is in equilibrium with its vapour at its boiling point. On the average, the molecules in the two phase have equal
The compound formed by elements X and Y crystallizes in a cubic structure in which X atoms are at the corners of the cube and Y atoms are at the face centres. The formula of the compound is
A graph of adsorption isobar of chemisorption shows that adsorption
In acidic medium, KMnO₄ oxidised FeSO₄ solution. Which of the following statements is correct ?
Concentration of silver ore is based on its solubility in
Finely divided iron combines with CO to give