Which of the following compounds does not form an ozonide?
Aryl halides are less reactive towards nucleophilic substitution reactions as compared to akyl halides due to
1-Butyne reacts with cold alkaline KMnO₄ to yield
In its reaction with silver nitrate acetylene shows
A salt gives viotlet vapours when treated with conc. H₂SO₄, it contains
Which of the following group represents a collection of iso-electronic species?(At.nos.N = 7, F = 9 and Na = 11)
Which of the following sets of quantum numbers is correct for an electron in 4f-orbitals?
If the radius of first Bohr orbit be a₀, then the radius of the third orbit of hydrogen would be
Which of the following compounds has a smallest bond angle in its molecule?
Which of the following is an electrophile?
Which of the following molecule has dipole moment greater than zero?
A vessel at equilibrium, contains SO₃, SO₂ and O₂. Now some helium gas is added, so that total pressure increases while temperature and volume remain constant. According to Le-Chatelier's principle, the dissociation of SO₃
Since enthalpy of elements in their natural state is taken to the zero .The value of ∆Hf of compounds
The hydrolysis of ester in alkaline medium is a
Enthalpy of an exothermic reaction is always
Heat of combustion ΔH for C(s), H2(g) and CH4(g) are -94, -68 and -213 cal/mol. Then ΔH for C(s) + 2H2(g) → CH4(g) is
CH4 + 2O2 = CO2 + 2H2O
ΔH = -213 cal/mol .....(1)
C + O2 = CO2
ΔH = - 94 cal/mol .....(2)
H2 + (1/2) O2 = H2O
ΔH = - 68 cal/mol .....(3)
ΔH for C(s) + 2H2(g) → CH4(g)
= 2(eq 3) + (eq 2) - (eq 1)
= (- 68 x 2) + (- 94) - (- 213) = -17Kcal
The compound having only primary hydrogen atoms is :
The additive used in composite propellants is
The number of geometrical isomers from [Co(NH₃)₃(NO₂)₃] is
Of the following, the one with largest size is
As the number of electrons in an atom decreases, the effective nuclear charge and attractive force on the outer electrons increases whereas if the number of electrons increases, the effective nuclear charge decreases.Thus, the cation with highest charge always possess smallest ionic size and anion with highest charge always possess largest ionic size.
Iron rusts in the presence of
During smelting an additional substance is added which combines with impurities to form a fusible product. It is known as
16 gm of oxygen and 3 gm of hydrogen are mixed and kept in 760 mm pressure at 0oC. The total volume occupied by the mixture will be nearly
In Solvay ammonia process, sodium bicarbonate is precipitated due to
A gas is said to behave like an ideal gas when the relation PV/T = consatnt. When do you expect a real gas to behave like an ideal gas ?
Which of the following statement is not true about potash alum?
Butter of tin is
Method used for obtaining highly pure silicon used as a semiconductor material, is
Which element from group 15 gives most basic compound with hydrogen ?
The products of the chemical reaction between Na₂S₂O₃, Cl₂ and H₂O are
Which is the most volatile compound?
Calcium dissolves in dilute hydrochloric acid and produces
What happens when few drops of H₂SO₄ are added to water?
A metal which does not liberate H₂(g) from acids is;
Which of the following will give maximum ions in solution ?
Aqueous solution of sodium acetate is
Maximum number of open chain isomers that an alkene can have with the molecular formula C4H8 is :
Unstable substances exhibit higher radioactivity due to
Gamma rays are
Formic acid when treated with conc.H2SO4 gives
The boiling point of glycerol is more than propanal because of:
Chlorination of toluene with excess of chlorine in the presence of light and heat followed by treatment with aqueous NaOH gives
Ethylene reacts with 1% cold alkaline KMnO₄ to form
Which does not contain conjugate system?
In dienes, when the double bonds connected to each other by a single bond, this arrangement is known as conjugated.
Which of the following reagents is useful in separating benzoic acid from phenol?
Which gives more stable product ?
The oxidation number of cobalt in K[Co(CN)₄] is
Zinc powder + Ph -OH → X. In the above reaction the product X will be
The compound formed in the positive test for nitrogen with Lassaigne's solution of an organic compounds is
Terylene is used for making
Oxidation number of P in KH₂PO₂ is
In a crystal a ≠ b ≠ c, α = γ = 90o and β ≠ 90o. It is
Oxidation number of S in H₂S₂O₈ is
What is the normality of a 1 M solution of H₃PO₄ ?
The freezing point of a solution, prepared from 1.25 g of a non-electrolyte and 20 g of water is 271.9 K. If molar depression constant is 1.86 K mole-1, the molar mass of the solute will be
Which out of the following is chiral in nature?
When H₂S is passed through nitric acid, the product is
The number of moles of oxygen in one litre of air containing 21% oxygen by volume, in standard conditions, is
Amount of O2 in 1 litre air = 21 % = 0.21 L .
∵ 22.4 L . of O2 = 1 mol
∴ 0.21 L of O2 = 1/22.4 x 0.21 mol = 0.0093 mol
Which of the following order is correct for the size of Fe+2, Fe and Fe+3?
In the extraction of iron, slag is produced which is