Lucas test is used for the determination of
The homologue of ethyne is
Compound (A)C₅H₁₀O forms a phenylhydrazone and gives negative Tollen's and iodoform test. Compound (A) on reduction gives n-pentane. Compound (A) is
When chlorine water is added to an aqueous solution of potassium halide in presence of chloroform, a violet colour is obtained. On adding more of chlorine water, the violet colour disappears, and a colourless solution is obtained. This test confirms the presence of the following in aqueous solution.
Product A is
Chloride ion and potassium ion are isoelectronic. Then
Which of the following has a derived unit?
Carboxylic acids are more acidic than phenol and alcohol because of
Oleic, stearic, palmitic acids are
The hybrid orbitals at carbon 2 and 3 in the compound CH3CH = CHCH3 are :
BCl3 molecule is planar while NCl3 is pyramidal because
If a mixture containing 3 moles of hydrogen and 1 mole of nitrogen is converted completely into ammonia, the ratio of volumes of reactants and products at the same temperature and pressure would be
3H2 + N2 → 2NH3
∴ 3V 1V → 2V
Total initial volume = 3V + 1V = 4V
Final volume = 2V
Hence, ratio of initial and final volume will be 2 : 1
The law formulated by Nernst is
The time taken for 90% of a first order reaction to complete is approximately
Which of the following statements is true?
Medicine which is an antibiotic is
The number of πbonds in
CH₂ = CH - CH = CH - C ≡ CH is
Which of the following is isoelectronic as well as has the same structure as that of N₂O?
CO2 and N2O are isoelectronic with 22 electrons and isostructural with linear geometry.
Structure of nitrous oxide:
Structure of carbon di-oxide:
O = C = O
Which of the following will act as buffer solution ?
Baeyer's reagent is used in the laboratory for
The rms velocity at NTP of the species can be calculated from the expression
Which pair of isomerism is not possible together?
Which of the following solution cannot act as a buffer ?
In radioactive decay which one of the following moves the fastest ?
Which of the following is a strongest base?
An organic compound A reacts with methyl magnesium iodide to form an addition product which on hydrolysis forms the compound B. Compound B gives blue colour salt in Victor Meyer's test. The compounds A and B are respectively.
Which is most stable carbocation?
Polyvinyl alcohol can be prepared by
Lassaigne's test for the detection of nitrogen fails in
When iron is added to CuSO₄ solution, copper is precipitated. It is due to
A solid AB has NaCl type structure. If radius of the cation A is 100 pm, then radius of the anion is
Molal depression constant for water is 1.86°C. The freezing point of a 0.05 molal solution of a non electrolyte in water is
32 g of oxygen and 3.0 g of hydrogen are mixed and kept in a vessel at 760 mm pressure and 0°C. The total volume occupied by the mixture will be nearly
Total volume of a mixture of gases is equal to the sum of the partial volume of the constituent gases.
V1 + V2 = Vtotal
while V1, that is, partial volume of a gas in a mixture is defined as the volume which the gas would occupy if it were present alone in a container at temperature T and pressure p of the mixture.
So, number of moles of O2 = 32/32 = 1 mole
number of moles of H2 = 3/2 = 1.5 moles
V2 = 33.600 dm3
Hence the total volume occupied by the mixture = 56.000 dm3
From a salt solution of Cu, 0.534 g of Mg displaces 1.415 g of Cu. If equivalent weight of Mg is 12, then equivalent weight of Cu will be
Collodial solution of arsenious sulphide is prepared by