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प्रश्न
Give the formula of the following gas:
Carbon monoxide
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उत्तर
Carbon monoxide – CO
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संबंधित प्रश्न
Write the names and symbols of the first twenty elements that you have studied in class VI & VII.
Define: Elements-
Match the formulas of the following of acids with their correct names:
Acids – (a) HCI (b) HNO3 (c) H2SO4 (d) H2CO3
Names – (1) Carbonic acid (2) Sulphuric acid (3) Hydrochloric acid (4) Nitric acid
Elements are mainly classified into metals and non-metals. State six properties of metals which differ from non-metals.
Select the correct answer from the choice in the bracket.
The formula of caustic soda.
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Sulphide
Complete the statement given below by filling in the blanks with the correct words.
From the elements – He, Br, Pt and O; the element which forms a polyatomic molecule is ________ and which is liquid at room temperature is ________.
The name copper was taken from ______.
The first letter of a symbol is always written as a ______ letter and the second letter as a ______ letter.
Which letter is never used in any element symbol?
