Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

The pair of compounds in which both the compounds give the positive test with Tollen’s reagent is:

Mole fraction of C₃H₅(OH)₃ in a solution of 36 g of water and 46 g of glycerine is ______.

Out of molality (m), molarity (M), formality (F) and mole fraction (x), those which are independent of temperature are:

\[\ce{CH3CH2CH2Cl ->[alc. KOH] B ->[HBr] C ->[Na/ether] D}\]

In the above reaction, the product D is:

In the following sequence of reactions:

\[\ce{C2H5Br ->[AgCN] X ->[Reduction] Y}\]; Y is

Identify Z in the series:

\[\ce{CH2 = CH2 ->[HBr] X ->[aq. KOH] Y ->[Na2CO3][I2 excess] Z}\]

1-Propanol and 2-propanol can be best distinguished by:

The IUPAC name of the ether CH₂ = CH–CH₂OCH₃ is:

The major product formed by the reaction:

\[\begin{array}{cc}
\ce{CH3CH-CH2Br ->[CH3O^-][CH3OH] is}\\
|\phantom{................}\\
\ce{CH3}\phantom{.............}
\end{array}\]

\[\ce{HC ≡ CH ->[HgSO4][H2SO4] ->[CH3MgBr][H2O] ->[PBr3]}\]

The product of acid catalysed hydration of 2-phenylpropene is:

NaCl type crystal (with coordination no. 6 : 6) can be converted into CsCl type crystal (with coordination no. 8 : 8) by applying ____________.

How many chloride ions are surrounding sodium ions in sodium chloride crystal?

The number of moles of NaCl in 3 litres of 3 M solution is ____________.

4 L of 0.02 M aqueous solution of NaCl was diluted by adding one litre of water. The molality of the resultant solution is ______.

Cone. H₂SO₄ is 98% H₂SO₄ by mass has d = 1.84 g cm⁻³. Volume of acid required to make one litre of 0.1 M H₂SO₄ is:

What is the mole fraction of solute in 1.00 m aqueous solutions?

\[\begin{array}{cc}
\ce{CH3-CH-CH=CH2 + HBr -> A}\\
|\phantom{.....................}\\
\ce{CH3}\phantom{..................}
\end{array}\]

'A' is:

The heating of phenyl methyl ether with HI produces:

Which of the following gives a positive iodoform test?