1
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language

Identify the correct statements :

(A) The molality of 2.5 g of ethanoic acid (Molar mass : $60 \mathrm{~g} \mathrm{~mol}^{-1}$ ) in 75 g of benzene solution is 0.556 m .

(B) The molarity of a solution containing 5 g of NaOH (molar mass : $40 \mathrm{~g} \mathrm{~mol}^{-1}$ ) in 450 mL of solution is 0.278 M at 298 K .

(C) Aquatic species are more comfortable in cold water.

(D) The solubility of gas increases with decrease in pressure.

(E) For a binary mixture of $A$ and $B$, the number of moles of $A$ and $B$ are $n_A$ and $n_B$ respectively. The mole fraction of $B$ will be $x_B=\frac{n_A}{n_A+n_B}$.

Choose the correct answer from the options given below :

A

A, B and C only

B

A and B only

C

A and C only

D

A, D and E only

2
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language

During Lassaigne's test, the elements present in an organic compound are converted from :

A

Ionic form to ionic form

B

Covalent form to ionic form

C

Covalent form to covalent form

D

Ionic form to covalent form

3
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language

A solution of copper sulphate is electrolysed for 10 minutes with a current of 1.5 amperes. The mass of copper deposited at cathode is :

(Given : Molar mass of $\mathrm{Cu}=63 \mathrm{~g} \mathrm{~mol}^{-1}$;

$$ \left.1 \mathrm{~F}=96487 \mathrm{C} \mathrm{~mol}^{-1}\right) $$

A

1.7018 g

B

0.2938 g

C

2.4036 g

D

0.5876 g

4
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language

At a certain temperature, $\mathrm{T}(\mathrm{K})$, during a process, 500 J is absorbed by the system and work of 200 J is done by the system. Then change in internal energy of the system is :

A

400 J

B

300 J

C

700 J

D

500 J