Dr Dalal Chemistry for Class 9 Solutions. We covered all the Dr Dalal Chemistry for Class 9 Solutions in this post for free so that you can practice well for the exam.
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Dr Dalal Chemistry for Class 9 Objective with Solutions
Which one of the following is not true for diamonds?
(a) Each carbon atom is linked to four other carbon atoms.
(b) Three-dimensional network structure of carbon atoms is formed.
(c) It is used as an abrasive for sharpening hard tools.
(d) It can be used as a lubricant.
Option d – It can be used as a lubricant
Red phosphorus is used in the manufacture of safety matches. This is due to the fact that:
(a) It shows phosphorescence.
(b) At ordinary temperature, it is less reactive than other varieties of phosphorus.
(c) It cannot be converted to white phosphorus on heating.
(d) It does not react with halogens on heating.
Option b – At ordinary temperature, it is less reactive than other varieties of phosphorus
Which one of the following statements is not correct?
(a) Water starts boiling when its vapor becomes equal to atmospheric pressure.
(b) Water is known as the universal solvent.
(c) Permanent hardness of water is due to the presence of MgCl₂, CaCl₂, MgSO₄, and CaSO₄.
(d) The density of ice is greater than that of water.
Option d – The density of ice is greater than that of water
We covered all the dr dalal chemistry for class 9 solutions above in this post for free so that you can practice well for the exam.
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