Science Practice Quiz 7

Q1.What change in colour is observed when silver chloride is placed in sunlight for some time?

A. It turns white B. It turns grey C. It turns black D. It turns yellow

Q2.Silver chloride decomposes into which substances when exposed to sunlight?

A. Silver and oxygen B. Silver and chlorine C. Lead and chlorine D. Lead and oxygen

Q3.Which of the following chemical equations represents the decomposition of silver chloride by light?

A. 2AgCl(s) Sunlight → 2Ag(s) + O2(g) B. 2AgCl(s) Sunlight → 2Ag(s) + Cl2(g) C. AgCl(s) Sunlight → Ag(s) + Cl(g) D. 2AgCl(s) Sunlight → 2AgCl2(s)

Q4.Which of the following is NOT a component mentioned for the setup of water electrolysis?

A. Carbon electrodes B. 6 volt battery C. Dilute sulphuric acid D. Silver chloride

Q5.What is the primary observation made at both electrodes during the electrolysis of water?

A. Formation of a solid precipitate B. Change in electrode colour C. Formation of bubbles D. Decrease in water level without bubbles

Q6.When lead nitrate is heated, which of the following substances are produced?

A. Lead oxide, nitrogen dioxide, and oxygen B. Lead chloride, nitrogen, and oxygen C. Lead sulphide, nitrogen dioxide, and hydrogen D. Lead carbonate, nitrogen, and carbon dioxide

Q7.Which two gases are produced when lead nitrate is heated?

A. Nitrogen and Oxygen B. Nitrogen dioxide and Oxygen C. Carbon dioxide and Oxygen D. Sulphur dioxide and Nitrogen

Q8.According to the provided text, for what purpose is a solution of substance ‘X’ used?

A. For cleaning metals B. For whitewashing C. For conducting electricity D. For preserving food

Q9.Activity 1.9, which involves dipping iron nails in copper sulphate solution, is categorized as what type of reaction?

A. Combination Reaction B. Decomposition Reaction C. Displacement Reaction D. Double Displacement Reaction

Q10.The decomposition reaction of silver bromide, as described in the text, finds its application in which of the following?

A. Color photography B. Digital imaging C. Black and white photography D. X-ray imaging

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Science Practice Quiz 7