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Q61. Note the following balanced chemical equation: 2CO+O2s2CO2 which one of the following statements is significant in relation to the above chemical equation?

Q62. Which one of the following statements is not correct?

Q63.Why do two ice blocks join to form one block when pressed together?

Q64. Cyanide poisoning causes death in seconds because

Q65. Which of the following acids is a mineral acid?

Q66. Calcium carbonate is naturally available as limestone and can also be synthesised from quicklime. It is seen that the compositions of the elements in both the natural and synthetic calcium carbonate are same. The validity of which one among the following laws is confirmed by this observation?

Q67. Which one of the following is not true for diamond?

Q68. Which one among the following statements regarding the properties of mixtures and compounds is not correct?

Q69. Red phosphorus is used in the manufacture of safety matches. This is due to the fact that

Q70. Standard 18-carat gold sold in the market contains

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