NDA · General Ability Test — General Knowledge
Atomic structure, common substances and chemical principles.
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Q1 · Chemistry (~15%) · EASY
An atom of an element has 17 protons, 18 neutrons and 17 electrons. What is the mass number of this atom?
Q2 · Chemistry (~15%) · EASY
Which of the following gases is commonly used in the preparation of soft drinks?
Q3 · Chemistry (~15%) · MEDIUM
When iron reacts with dilute hydrochloric acid, which of the following products is formed?
Q4 · Chemistry (~15%) · MEDIUM
Which one of the following is NOT a natural fertiliser?
Q5 · Chemistry (~15%) · HARD
In a redox reaction, if substance A loses electrons and substance B gains electrons, which of the following statements is correct?