Graphite is a

• molecular solid

• covalent solid

• ionic solid

• metallic solid

Which one of the following transition metal ions is diamagnetic?

• Co²⁺

• Ni²⁺

• Cu²⁺

• Zn²⁺

13.

The ratio of the difference in energy between the first and the second Bohr orbit to that between the second and the third Bohr orbit is

• $\frac{1}{2}$

• $\frac{1}{3}$

• $\frac{4}{9}$

• $\frac{27}{5}$

Acetic anhydride is prepared in the laboratory by heating sodium acetate with

• ethyl chloride

• acetyl chloride

• conc. H₂SO₄

• zinc dust

For the reaction,

NH₃ + OCl^- $\to$ N₂H₄ + Cl^-

occurring in basic medium, the coefficient of N₂H₄ in the balanced equation will be

• 1

• 2

• 3

• 4

The IUPAC name of acryldehdye is

• prop-2-en-l-al

• propenylaldehyde

• but-2-en-l-al

• propenal

The structures of (CH₃)₃CBr and CH₃[CH₂]₃ Br represent

• chain isomerism

• position isomerism

• chain as well as position isomerism

• functional isomerism

Petrol for aviation purpose must contain

• straight chain hydrocarbons

• aromatic hydrocabrons

• olefinic hydrocarbons

• highly branched chain paraffins

The solubility product of Hg₂l₂ is equal to

• $\left[{\mathrm{Hg}}_2^{2+}\right]\left[{\mathrm{I}}^{-}\right]$

• [Hg²⁺][I^-]

• $\left[{\mathrm{Hg}}_2^{2+}\right]{\left[{\mathrm{I}}^{-}\right]}^2$

• [Hg²⁺][I^-]²

Moist hydrogen peroxide can not be dried over conc. H₂SO₄ because

• it can catch fire

• it is reduced by H₂SO₄

• it is oxidised by H₂SO₄

• it is decomposed by H₂SO₄