Chemistry - MOST IMPORTANT DDA MTS Previous Year Questions
Practice real questions from previous year exams of DDA MTS.
📘 Chemical Reactions📚 Combination Reaction
Q1
When copper powder in a china dish is heated, the surface of the copper powder is coated with a black substance. This is due to the formation of:
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📘 Gas Laws📚 Graham's Law of Diffusion
Q2
The rate of diffusion of a gas is ____.
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📘 Electron Configuration📚 Valency
Q3
Based on the following table, find the formula of ammonium sulphate. Also, find the valency of Ammonium ion and Sulphate ion.
Element Valency
N -3
H +1
S +6
O -2
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📘 Electron Configuration📚 Valency
Q4
Since Nitrogen has a valency of 3 and that of hydrogen is 1, they can combine to form Ammonia (NH3) which is a neutral compound. But if NH3 combines with another hydrogen cation, how is the valency of the new compound affected?
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📘 Acids, Bases and Salts📚 Chemical Properties of Acids
Q5
Which gas is produced when baking soda reacts with vinegar?
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📘 Organic Chemistry📚 Misc
Q6
Fats and oils belong to which class of biomolecules?
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📘 Atomicity📚 Polyatomic
Q7
How many atoms are there in one molecule of methane (CH4)?
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📘 Acids, Bases and Salts📚 Neutralization Reaction
Q8
When an acid reacts with a base, the products formed are ______.
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📘 Classification of Matter on the basis of Chemical Properties- I📚 Pure Substance- Compound
Q9
Which of the following is an example of a compound?
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📘 Electron Configuration📚 Cations and Anions
Q10
Which of the following represents a cation?
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📘 Classification of Matter on the basis of Chemical Properties- I📚 Pure Substance- Element
Q11
Which of the following is NOT an example of an element?
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📘 Oxidation and Reduction📚 Oxidation
Q12
During rusting, iron combines with oxygen in the presence water. What type of reaction is this?
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