Solid A is a very hard electrical insulator in solid as well as in molten state and melts at extremely high temperature. What type of solid is it?
The solids which are very hard have their atoms bind to each other by covalent forces which are very strong, as a result they have high melting and boiling points and do not conduct heat are called as covalent crystals (crystalline solids). Hence, solid A shows the properties of an covalent crystalline solids.
For example diamond (C), quartz (SiO2), & silicon carbide SiC)
The reaction between A and B is first order with respect to A and zero order with respect to B. Fill in the blanks in the following table:
| Experiment |
A/ mol L - 1 |
B/ mol L - 1 |
Initial rate/mol L - 1 min - 1 |
| I | 0.1 | 0.1 |
2.0 × 10 - 2 |
| II | -- | 0.2 |
4.0 × 10 - 2 |
| III | 0.4 | 0.4 | -- |
| IV | -- | 0.2 |
2.0 × 10 - 2 |
NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:
The solids which are very hard have their atoms bind to each other by covalent forces which are very strong, as a result they have high melting and boiling points and do not conduct heat are called as covalent crystals (...
Step-by-step explanation:
• The solids which are very hard have their atoms bind to each other by covalent forces which are very strong, as a result they have high melting and boiling points and do not conduct heat are called as covalent crystals (crystalline solids)
• Hence, solid A shows the properties of an covalent crystalline solids
•
•
• For example diamond (C), quartz (SiO2), & silicon carbide SiC)
This question is important because it tests key concepts from the NCERT syllabus and is frequently asked in CBSE exams.
This question is based on core NCERT concepts explained in the chapter and should be revised thoroughly before exams.
Students often lose marks by skipping steps, writing incomplete explanations, or misunderstanding keywords used in the question.
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