Chemistry — NDA General Ability Test PYQs

If $x$ is the number of electrons and $y$ is the number of nucleons present in ${}_{16}^{32}{\text{S}}^{2-}$, then which one of the following is correct?

Which one of the following forms of carbon is thermodynamically most stable?

Consider the following statements :
I. A colloid and a suspension are heterogeneous mixtures.
II. Colloids can be separated from the mixture by the process of centrifugation.
III. Particles of colloids and suspensions can be seen by naked eye.
IV. The aqueous solution of copper sulphate does not show Tyndall effect; however, the mixture of milk and water shows Tyndall effect.
Which of the statements given above is/are correct?

A non-volatile solid solute may be separated from a solution by which of the following processes?
I. Evaporation
II. Crystallization
Select the correct answer using the code given below.

Which of the following are oxidation reactions?
I. Rusting of iron
II. Burning of fuel
III. Rancidity of oils and fats
IV. Browning of fruits
Select the correct answer using the code given below.

Consider the following statement :
"Acids are substances that dissociate in water to give hydrogen ions ${\text{H}}^{+}\text{ (aq)}$, and bases are substances that produce hydroxyl ions ${\text{OH}}^{-}\text{ (aq)}$."
The above statement is based on which one of the following concepts?

Superphosphate of lime—a phosphate fertilizer—is obtained by the reaction of

$1\cdot 7\text{ g}$ of silver nitrate is dissolved in $100\text{ g}$ of water, and $0\cdot 585\text{ g}$ of sodium chloride is dissolved in $100\text{ g}$ of water. Both are mixed and a chemical reaction occurs. $1\cdot 435\text{ g}$ of silver chloride and $0\cdot 85\text{ g}$ of sodium nitrate are formed. Which law of chemical combination is shown by the above reaction?

Which of the following statements is/are correct with regard to Nitrolim?
I. It is prepared by heating calcium carbide with nitrogen.
II. It decomposes into ammonia in soil.
III. It is an NPK fertilizer.
IV. It is an organic fertilizer.
Select the answer using the code given below.

Consider the following pairs :
I. Pigment : ${\text{TiO}}_2$
II. Drier : Turpentine
III. Thinner : Naphthenates
IV. Antiskinning agent : Polyhydroxy phenol
How many of the pairs given above are correctly matched?