JEE Mains JEE Advance BITSAT
JEE Mains | PYQ

Year

All years 2026 2025 2024 2023 2022 2021

Match List - I with List II :

Choose the most appropriate answer from the options given below

In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present?

During the borax bead test with $ \mathrm{CuSO_4} $, a blue green colour of the bead was observed in oxidising flame due to the formation of:

Phenolic group can be identified by a positive:

When a salt is treated with sodium hydroxide solution it gives gas $ X $. On passing gas $ X $ through reagent $ Y $ a brown coloured precipitate is formed. $ X $ and $ Y $ respectively, are:

Which element is not present in Nesskr’s reagent?

Which of the following is structure of a separating funnel?

$ 1.86 \, \text{g} $ of aniline completely reacts to form acetanilide. $ 10\% $ of the product is lost during purification. Amount of acetanilide obtained after purification (in $ \text{g} $) is _______ $ \times 10^{-2} $.

Choose the correct tests with respective observations.
(A) $ \mathrm{CuSO_4} $ (acidified with acetic acid) $ + \mathrm{K_4[Fe(CN)_6]} \rightarrow $ Chocolate brown precipitate.
(B) $ \mathrm{FeCl_3} + \mathrm{K_4[Fe(CN)_6]} \rightarrow $ Prussian blue precipitate.
(C) $ \mathrm{ZnCl_2} + \mathrm{K_4[Fe(CN)_6]} $, neutralised with $ \mathrm{NH_4OH} \rightarrow $ White or bluish white precipitate.
(D) $ \mathrm{MgCl_2} + \mathrm{K_4[Fe(CN)_6]} \rightarrow $ Blue precipitate.
(E) $ \mathrm{BaCl_2} + \mathrm{K_4[Fe(CN)_6]} $, neutralised with $ \mathrm{NaOH} \rightarrow $ White precipitate.
Choose the correct answer from the options given below:

10.

During the qualitative analysis of salt with cation $ y^{2+} $, addition of a reagent $ (X) $ to alkaline solution of the salt gives a bright red precipitate The reagent $ (X) $ and the cation $ (y^{2+}) $ present respectively are;

11.

Number of compounds giving (i) red colouration with ceric ammonium nitrate and also (ii) positive iodoform test from the following is ______.

12.

Which of the following compounds would give the following set of qualitative analysis?
(i) Fehling’s Test : Positive
(ii) $ \mathrm{Na} $ Fusion extract upon treatment with sodium nitroprusside gives a blood red colour but not Prussian blue.

13.

Consider the sulphides $ \mathrm{HgS} $, $ \mathrm{PbS} $, $ \mathrm{CuS} $, $ \mathrm{Sb_2S_3} $, $ \mathrm{As_2S_3} $ and $ \mathrm{CdS} $. Number of these sulphides soluble in $ 50\% $ $ \mathrm{HNO_3} $ is _________ .

14.

Compound that will give positive Lassaigne’s test for both nitrogen and halogen is:

15.

Statement I : A mixture of $ \mathrm{C_{12}H_{22}O_{11}} $ (sugar) and $ \mathrm{NaCl} $ can be separated by dissolving sugar in alcohol, due to differential solubility.
Statement II : Rose essence from rose petals is separated by steam distillation due to its high volatility and insolubility in $ \mathrm{H_{2}O} $.
In the light of the above statements, choose the correct answer from the options given below :

16.

Match List-I with List-II :

List-I Test/Reagents/Observation(s)	List-II Species detected
(a) Lassaigne’s Test	(i) Carbon
(b) Cu(II) oxide	(ii) Sulphur
(c) Silver nitrate	(iii) N, S, P, and halogen
(d) The sodium fusion extract gives black precipitate with acetic and lead acetate	(iv) Halogen Specifically

The correct match is:

17.

In the wet tests for identification of various cations by precipitate, which transition element cation doesn’t belong to group IV in qualitative inorganic analysis?

18.

$0.53\text{ g}$ of an organic compound $(\text{x})$ when heated with excess of nitric acid (concentrated) and then with silver nitrate gave $0.75\text{ g}$ of silver bromide precipitate. $1.0\text{ g}$ of $(\text{x})$ have $1.32\text{ g}$ of $\text{CO}_2$ gas on combustion. The percentage of hydrogen in the compound $(\text{x})$ is ______________%. [Nearest Integer]

$
\begin{aligned}
&[\text{Given : Molar mass in g mol}^{-1} \text{ H} : 1, \text{ C} : 12, \text{ Br} : 80, \text{ Ag} : 108, \text{ O} : 16; \text{ Compound (x)} : \\
&\text{C}_x\text{H}_y\text{Br}_z]
\end{aligned}
$

19.

In Dumas’ method for estimation of nitrogen $ 0.4 \, \text{g} $ of an organic compound gave $ 60 \, \text{mL} $ of nitrogen collected at $ 300 \, \text{K} $ temperature and $ 715 \, \text{mm Hg} $ pressure. The percentage composition of nitrogen in the compound is:
(Given: Aqueous tension at $ 300 \, \text{K} $ = $ 15 \, \text{mm Hg} $)

← PreviousQuestion 12 of 19Next →

JEE Main 2023 30th Jan Morning Shift

JEE MainsJEE AdvanceBITSATJEE Mains | PYQ

JEE Mains JEE Advance BITSAT
JEE Mains | PYQ