A compound gives an orange-red colour to non-luminous flame. This compound is likely to contain?
A. Na+ B. Ca²+ C. Fe³+ D. Fe²+ Correct Answer: Option B – Ca²+
When iron is exposed to moist air; it gradually rusts. This is due to the formation of?
A. hydrate iron (III) oxide B. anhydrous iron (III) oxide C. anhydrous iron (II) oxide D. hydrate iron (II) oxide Correct Answer: Option A – hydrate iron (III) oxide
A constituent common to bronze and solder is?
A. lead B. silver C. copper D. tin Correct Answer: Option D – tin
Which of the following is used in rocket fuels?
A. HNO3 B. CH3COOH C. H2SO4 D. HCl Correct Answer: Option A – HNO3
The brown ring observed after the addition of a stream of concentrated tetraoxosulphate (VI) acid confirmed the presence of?
To a solution of an unknown compound, a little dilute tetraoxosulphate (VI) acid was added with some freshly prepared iron (II) tetraoxosulphate (VI) solution. The brown ring observed after the addition of a stream of concentrated tetraoxosulphate (VI) acid confirmed...Products
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