Fill in the blanks from the choices given below:
A molecule of ………… contains a triple bond (hydrogen, ammonia, nitrogen).
Fill in the blanks from the choices given below:
Across a period, the ionisation potential …………….(increases, decreases, remains same)
Name the method used for preparation of the following salts from the list given below:
| A. Sodium nitrate | (i) Simple displacement |
| B. Iron III chloride | (ii) Neutralization |
| C. Lead chloride | (iii) Decomposition by acid |
| D. Lead chloride | (iv) Double decomposition |
| E. Sodium hydrogen sulphate | (v) Direct synthesis |
Sodium hydroxide solution is added to the solutions containing the ions mentioned in list X. List Y gives the details of the precipitate. Match the ions with their coloured precipitates.
| A. Pb2+ | (i) Reddish brown |
| B. Fe2+ | (ii) White insoluble in excess |
| C. Zn2+ | (iii) Dirty green |
| D. Zn2+ | (iv) White soluble in excess |
| E. Cu2+ | (v) White soluble in excess |
| F. Ca2+ | (vi) Blue |
Choose the correct word/phrase from within the bracket to complete the following sentences:
The catalyst used for conversion of ethene to ethane is commonly……. (nickel /iron/cobalt)
Fill in the blanks from the choices given below:
Down the group, electron affinity…………….(increases, decreases, remains same).
Fill in the blanks from the choices given below:
In covalent compounds, the bond is formed due to the ………(sharing/transfer) of electrons.
choose the correct word/phrase from within the bracket to complete the following sentences:.
When acetaldehyde is oxidized with acidified potassium dichromate, it forms ………(ester/ethanol/acetic acid)
choose the correct word/phrase from within the bracket to complete the following sentences:
Ethanoic acid reacts with ethanol in presence of concentrated H2SO4, so as to form a compound and water. The chemical reaction which takes place is called………….(dehydration/hydrogenation/esterification)
Fill in the blanks from the choices given below:
Electrovalent compound have a ………..(low/high )boiling point.
