Chemistry Question Bank

Which of the following halides is least stable and has doubtful existence ?

In which of the following the inert pair effect is most prominent ?

Silicon is an important constituent of

Which of the following acids cannot be stored in glass ?

CO2 is not a poisonous gas but there is increase in concentration of CO2 in the atmosphere due to burning of fossil fuels and decompostion of limestone. The increase in concentration of CO2 may lead to

Which of the following is not true about structure of carbon dioxide ?

Which is not a method of preparing carbon monoxide on a commercial scale ? (a) 473 1273 K (s) (g) (g) 2(g) C H O CO H - + ¾¾¾¾¾® + (b) 1273 K (s) 2(g) 2(g) (g) 2(g) 2C O 4N 2CO 4N + + ¾¾¾® + (c) (g) (s) 2(g) 2C O 2CO …

Identify the incorrect statement.

The most stable form of carbon at high temperature is X. The C – C bond length in diamond is Y while C – C bond length in graphite is Z. What are X, Y and Z respectively ?

The members of group 14 form tetrahalides of the type MX4. Which of the following halides cannot be readily hydrolysed by water ?

Carbon shows a maximum covalency of four whereas other members can expand their covalence due to

The purest form of coal is

Aluminium chloride exists as dimer, Al2Cl6 in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives

Which of the following is not from 14 th group

Match the column I with column II and mark the appropriate choice. Column I Column II (A) Coal gas (i) CO + H2 (B) Synthesis gas (ii) CH4 (C) Producer gas (iii) H2 + CH4 + CO (D) Natural gas (iv) CO + N2

Identify X in the reaction : (steam) X 2H O XO 2H D + ¾¾® +

When excesss of carbon dioxide is passed through lime water, the milkiness first formed disappears due to

AlCl3 on hydrolysis gives:

Which one of the following is not the characteristic property of carbon ?

Graphite is soft while diamond is hard because

Moderate electrical conductivity is shown by

Catenation i.e., linking of similar atoms depends on size and electronic configuration of atoms. The tendency of catenation in Group 14 elements follows the order

In the purification of bauxite by Hall’s process:

AIF3 is soluble in HF only in presence of KF. It is due to the formation of

When excess of NaOH solution is added in potash alum, the product is: