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Cassiterite is concentrated by

  • Solution

    Cassiterite contains the magnetic impurities of FeSO4 and thus concentrated by electromagnetic separation.

The unit J Pa–1 is equivalent to

  • Solution

    Joule is the unit of work and Pascal is unit of pressure.

    JPa-1=\(\frac{J}{Pa}\) = \(\frac{Work}{Pressure}\)
    = \(\frac{Nm}{Nm^{-2}}\) = m3

Which of the following is an optically active compound ?

  • Solution

    The compound containing a chiral carbon atom i.e., (a carbon atom which is attached to four different atoms is known as a chiral carbon atom) is optically active.As 2-chlorobutane contains a chiral C* atom hence it is optically active.

  • Solution

    In the following reaction H2O2 acts as a reducing agent.
    PbO2(s) + H2O2 (aq) ⟶ PbO(s) + H2O(l) + O2 (g)

The enthalpy of fusion of water is 1.435 kcal/mol.The molar entropy change for the melting of ice at 0°C is :

  • Solution

  • Solution

Which one of the following is the correct order of field strength of ligands in spectrochemical series?

The hardest substance amongst the following is

  • Solution

    B4C is the hardest substance after diamond and BN.

The d electron configurations of Cr2+, Mn2+, Fe2+ and Ni2+ are 3d4, 3d5, 3d6 and 3d8 respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour?

(At.No. Cr = 24, Mn = 25, Fe = 26, Ni = 28)

  • Solution

Which of the following compounds transforms baking soda into baking powder?

If the impurities in a metal has a greater affinity for oxygen and is more easily oxidised than the metal, then the purification of metal may be carried out by

Reaction of chloroform with KOH in presence of a primary aromatic amine is called :

  • Solution

A solution of sodium thiosulphate on addition of few drops of ferric chloride gives violet colour due to the formation of

  • Solution

    The reaction can be represented as

    \(3Na_{2}S_{2}O_{3}+2FeCl_{3}\rightleftharpoons \underset{(Violet)}{Fe_{2}(S_{2}O_{3})_{3}}+6NaCl\)

  • Solution

Consider the acidity of the carboxylic acids :
(A)PhCOOH
(B)o-NO2C6H4COOH
(C)p-NO2C6H4COOH
(D)m-NO2C6H4COOH

Which of the following order is correct ?

  • Solution

DIRECTIONS: These are Assertion-Reason type question. Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these questions from the following four options.

Statement-1 :All the hydrogen atoms in CH2 = C = CH2 lie in one plane.
Statement-2 :Carbon atoms are sp2 and sp hybridized.

  • Solution

    The two hydrogen atoms on first carbon and the two H-atoms on the third carbon atom lie in perpendicular planes. The central carbon atom is sp-hybridized while terminal carbon atoms are sp2-hybridized.

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The correct order of ionization energies is

  • Solution

    A cation is always smaller in size as compared to corresponding neutral atom. Greater the magnitude of charge, smaller will be size of ion. Following is the correct order of decreasing size Al3+< Al2+< Al+< Al. ∴Al has largest size

Among the following the one that gives positive iodoform test upon reaction with I2 and NaOH is

  • Solution

Which of the following species contains three bond pairs and one lone pair around the central atom ?

  • Solution

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