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Deepak Rock
@deepak-rock
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Joined: Aug 6, 2021
Last seen: Sep 10, 2021
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Topics: 1742 / Replies: 303
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Topic
Give an example of a metal which (a) is a liquid at room temperature (b) can be easily cut with a knife
4 years ago
Forum
Metals and Non-metals
Replies: 0
Views: 61
Topic
CaO and NaCl have the same crystal structure and approximately the same ionic radii. If U is the lattice energy of NaCl, the approximate lattice energy of CaO is
4 years ago
Forum
Chemical Bonding and Molecular Structure
Replies: 0
Views: 226
Topic
Sulphur reacts with chlorine in 1:2 ratio and forms X. Hydrolysis of X gives a sulphur compound Y. What is the hybridisation state of central atom in the compound.
4 years ago
Forum
Chemical Bonding and Molecular Structure
Replies: 0
Views: 141
Topic
Which of the following substances has the least ionic character?
4 years ago
Forum
Chemical Bonding and Molecular Structure
Replies: 0
Views: 146
Topic
The formation of molecular complex BF3 – NH3 results in a change in hybridization of boron
4 years ago
Forum
Chemical Bonding and Molecular Structure
Replies: 0
Views: 413
Topic
In which of the following sets, all the given species are isostructural?
4 years ago
Forum
Chemical Bonding and Molecular Structure
Replies: 0
Views: 189
Topic
Which of the following statements is incorrect? (a) NH3 is more basic than PH3. (b) NH3 has a higher boiling point than that of HF.
4 years ago
Forum
Chemical Bonding and Molecular Structure
Replies: 0
Views: 316
Topic
KF combines with HF to form KHF2. The compound contains the species
4 years ago
Forum
Chemical Bonding and Molecular Structure
Replies: 0
Views: 261
Topic
The true statements from the following are 1. PH5 and BiCl5 do not exist 2. pπ - dπ bond is present in SO2
4 years ago
Forum
Chemical Bonding and Molecular Structure
Replies: 0
Views: 217
Topic
The maximum number of 90º angles between bond pair-bond pair of electrons is observed in
4 years ago
Forum
Chemical Bonding and Molecular Structure
Replies: 0
Views: 127
Topic
Which of the following statement is correct? (a) FeCl2 is more covalent than FeCl3. (b) FeCl3 is more covalent than FeCl2.
4 years ago
Forum
Chemical Bonding and Molecular Structure
Replies: 0
Views: 201
Topic
When a piece of limestone reacts with dilute HCl, a gas X is produced. When gas X is passed through lime water then a white precipitate Y is formed. On passing excess of gas X, the white precipitate dissolves forming a soluble compound Z.
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 204
Topic
Which element is common to all acids? (b) Compounds such as alcohol and glucose also contain hydrogen but are not categorised as acids. Describe an activity to prove it.
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 210
Topic
With the help of labelled diagrams, describe an activity to show that acids produce ions only in aqueous solutions.
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 101
Topic
What happens when an acid reacts with a metal carbonate? Explain with the help of an example. Write chemical equation of the reaction involved. (b) What happens when carbon dioxide gas is passed through lime water :
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 152
Topic
Why do acids not show acidic behaviour in the absence of water? (b) Why does an aqueous solution of an acid conduct electricity?
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 125
Topic
What is produced if an acid is added to a base? (b) Why does dry HCl gas not change the colour of dry litmus paper?
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 271
Topic
Why should curd and other sour foodstuffs (like lemon juice, etc.) not be kept in metal containers (such as copper and brass vessels)?
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 98
Topic
What is a neutralisation reaction? Explain with an example. Give the chemical equation of the reaction which takes place.
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 271
Topic
Why do HCl, H2SO4, HNO3, etc., show acidic character in aqueous solutions while solutions of compounds like C6H12O6 (glucose) and C2H5OH (alcohol) do not show acidic character?
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 269
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