91Ó°ÊÓ

Which of the following statements is not correct? (a) Lead salts are slow poisons 1 (b) Lead metal is used in accumulators (c) Plumbosolvency increases by the presence of carbonates, sulphates, phosphates, etc. (d) Lead is a soft metal

Chrome yellow is chemically called: (a) lead chromate \(\square\) (b) lead sulphate \(\Pi\) (c) lead iodide \(\square\) (d) basic lead acetate

The formula of white lead is: (a) \(\mathrm{Pb}(\mathrm{OH})_{2} \cdot \mathrm{PbCO}_{3}\) \(\square\) (b) \(2 \mathrm{PbCO}_{3} \cdot \mathrm{Pb}(\mathrm{OH})_{2}\) (c) \(\mathrm{Pb}(\mathrm{OH})_{2} \cdot \mathrm{Pb}\left(\mathrm{CH}_{3} \mathrm{COO}\right)_{2} \square\) (d) \(\mathrm{PbCO}_{3} \cdot \mathrm{PbO}\)

Which of the following is a covalent carbide? (a) \(\mathrm{CaC}_{2}\) \(\square\) (b) \(\mathrm{Al}_{4} \mathrm{C}_{3}\) (c) \(\mathrm{WC}\) (d) \(\mathrm{SiC}\)

The anhydride of carbonic acid is: (a) \(\mathrm{CO}\) \(\square\) (b) \(\mathrm{CO}_{2}\) (c) \(\mathrm{C}_{3} \mathrm{O}_{2}\) \(\square\) (d) none of these

The hydroxide of which metal ion is soluble in excess of sodium hydroxide solution: (a) \(\mathrm{Fe}^{3+}\) \(\square\) (b) \(\mathrm{Cr}^{3+}\) (c) \(\mathrm{Sn}^{2+}\) \(\square\) (d) \(\mathrm{Cu}^{2+}\)

The number of carbon compounds is very large because: (a) carbon is tetra-valent (b) it has non-metallic character (c) it shows allotropy

The heat of combustion of carbon is \(94 \mathrm{kcal}\). The calorific value of carbon is about: (a) \(7.8 \mathrm{kcal}\) \(\square\) (b) \(15.6 \mathrm{kcal}\) \(\square\) (c) \(47.0 \mathrm{kcal}\) \(\square\) (d) \(94 \mathrm{kcal}\) \(\square\)

Which compound is called sugar of lead? (a) \(\mathrm{PbCl}_{2}\) \(\square\) (b) \(\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}\) \(\square\) (c) \(\mathrm{PbSO}_{4}\) \(\square\) (d) \(\mathrm{Pb}\left(\mathrm{CH}_{3} \mathrm{COO}\right)_{2}\) \(\square\)

The number and type of bonds between two carbon atoms in \(\mathrm{CaC}_{2}\) are: (a) one sigma and one pi bond (b) one sigma and two pi bonds (c) one sigma and one and a half pi bond (d) one sigma bond