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TBayal Arademy Pre-Board Examination Class: X Subject: Chemistry Session: 2022 2023 Time 2 Hrs. Full Marks: 80 Section - A [Attempt all questions from this section] Question 1. [15] Choose the correct answer to the questions from the given options A. The blue colour of aqueous copper sulphate solution remains unchanged during electrolysis due to i) Platinum electrode ii) Zinc electrode iii) Graphite electrode iv) Copper electrode B. The non-metallic character of the elements down the group - i) First decreases the increases C. i) The main ore used in the extraction of iron is ii) Calamine Cryolite D. i) Colour of sulphuric acid is ii) A colourless liquid Green in colour E. The IUPAC i) Ethyne F. i) Which of the following is not a polar molecule? ii) HCI CCl4 G. What happens when blue litmus paper is introduced in dilute hydrochloric acid? name iii) Decreases ) Increases iv) Remains the same iv) Bauxite iii) Haematite iii) Yellow in colour iv) Blue in colour of ethylene is ii) Ethene - iv) Propere ii) Ethane iv) NH3 ii) H,0 i) No change in litmus paper iv) Litmus paper turns yellow i) Litmus paper turns green ii) Litmus paper turns red H. Hydroxide ofthis metal is soluble in sodium hydroxide solution ii) Silver ii) Lead i) Magnesium empirical formula of CHCOOH will be I. The i) CHO2 J. The catalyst used in the contact process isii) Iron Copper i) ii) C2HO K. An example of organic acid in the following ii) Acetic acid i) Hydrochloride acid iv) Copper - iv) C.H02 ii) CH,0 ii) Vanadium perexide iv) Manganese dioxide PCrlDxicle compound is - iii) Sulphuric acid iv) Nitric acid The method used for the collection of hydrogen chloride gas is ii) Upward displacement of air Downward displacement of air iv) Contact process West ward displacement of air - L. i) ii) M. A hydrocarbon which is a green house gas i) Acetylene ii) Ethylene iii) Ethane iv) Methane
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