Sign in
Please select an account to continue using cracku.in
↓ →
JEE WhatsApp Group
Join Our JEE Preparation Group
Prep with like-minded aspirants; Get access to free daily tests and study material.
Match List - I with List - II
| LIST-I (Atomic number) | LIST-II (Block of periodic table) |
|---|---|
| (A) 37 | I. p-block |
| (B) 78 | II. d-block |
| (C) 52 | III. f-block |
| (D) 65 | IV. s-block |
Login to view the detailed solution.
For OF$$_2$$ molecule consider the following:
(A) Number of lone pairs on oxygen is 2.
(B) FOF angle is less than 104.5°.
(C) Oxidation state of O is -2.
(D) Molecule is bent 'V' shaped.
(E) Molecular geometry is linear.
Correct options are:
Login to view the detailed solution.
Match List I with List II
| List I (molecules/ions) | List II (No. of lone pairs of e$$^-$$ on central atom) |
|---|---|
| (A) IF$$_7$$ | I. Three |
| (B) ICl$$_4^-$$ | II. One |
| (C) XeF$$_6$$ | III. Two |
| (D) XeF$$_2$$ | IV. Zero |
Login to view the detailed solution.
.webp)
The alkaline earth metal sulphate(s) which are readily soluble in water is/are:
(A) BeSO$$_4$$
(B) MgSO$$_4$$
(C) CaSO$$_4$$
(D) SrSO$$_4$$
(E) BaSO$$_4$$
Choose the correct answer from the options below:
Login to view the detailed solution.
Lithium aluminium hydride can be prepared from the reaction of
Login to view the detailed solution.
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): In expensive scientific instruments, silica gel is kept in watch-glasses or in semipermeable membrane bags.
Reason (R): Silica gel adsorbs moisture from air via adsorption, thus protects the instrument from water corrosion (rusting) and / or prevents malfunctioning.
In the light of the above statements, choose the correct answer from the options given below:
Login to view the detailed solution.
.webp)
What is the correct order of acidity of the protons marked $$A - D$$ in the given compounds?
The major products 'A' and 'B', respectively, are
Formation of photochemical smog involves the following reaction in which A, B and C are respectively.
(i) NO$$_2$$ $$\xrightarrow{h\nu}$$ A + B
(ii) B + O$$_2$$ $$\to$$ C
(iii) A + C $$\to$$ NO$$_2$$ + O$$_2$$
Choose the correct answer from the options below:
Login to view the detailed solution.
.webp)
In the extraction of copper, its sulphide ore is heated in a reverberatory furnace after mixing with silica to:
Login to view the detailed solution.
During the qualitative analysis of SO$$_3^{2-}$$ using dilute H$$_2$$SO$$_4$$, SO$$_2$$ gas is evolved which turns K$$_2$$Cr$$_2$$O$$_7$$ solution (acidified with dilute H$$_2$$SO$$_4$$):
Login to view the detailed solution.
Which of the following is correct order of ligand field strength?
Login to view the detailed solution.
.webp)
To inhibit the growth of tumours, identify the compounds used from the following:
(A) EDTA
(B) Coordination Compounds of Pt
(C) D-Penicillamine
(D) Cis - Platin
Choose the correct answer from the option given below:
Login to view the detailed solution.
Match List I with List II
Login to view the detailed solution.
Which of the following compounds would give the following set of qualitative analysis?
(i) Fehling's Test: Positive
(ii) Na fusion extract upon treatment with sodium nitroprusside gives a blood red colour but not prussian blue.
Benzyl isocyanide can be obtained by:
(A)
(B)
(C)
(D)
Choose the correct answer from the options given below:
Login to view the detailed solution.
Caprolactam when heated at high temperature in presence of water, gives
Login to view the detailed solution.
Amongst the following compounds, which one is an antacid?
Login to view the detailed solution.
In the wet tests for identification of various cations by precipitation, which transition element cation doesn't belong to group IV in qualitative inorganic analysis?
Login to view the detailed solution.
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Ketoses give Seliwanoff's test faster than Aldoses.
Reason (R): Ketoses undergo $$\beta$$-elimination followed by formation of furfural.
In the light of the above statements, choose the correct answer from the options given below:
Login to view the detailed solution.
The energy of one mole of photons of radiation of frequency $$2 \times 10^{12}$$ Hz in J mol$$^{-1}$$ is ______ . (Nearest integer)
(Given: h $$= 6.626 \times 10^{-34}$$ Js, N$$_A = 6.022 \times 10^{23}$$ mol$$^{-1}$$)
Login to view the detailed solution.
When 2 litre of ideal gas expands isothermally into vacuum to a total volume of 6 litre, the change in internal energy is ______ J. (Nearest integer)
Login to view the detailed solution.
600 mL of 0.01 M HCl is mixed with 400 mL of 0.01 M H$$_2$$SO$$_4$$. The pH of the mixture is ______ $$\times 10^{-2}$$. (Nearest integer)
[Given log2 = 0.30, log3 = 0.48, log5 = 0.69, log7 = 0.84, log11 = 1.04]
Login to view the detailed solution.
A 300 mL bottle of soft drink has 0.2M CO$$_2$$ dissolved in it. Assuming CO$$_2$$ behaves as an ideal gas, the volume of the dissolved CO$$_2$$ at STP is ______ mL. (Nearest integer)
Given: At STP, molar volume of an ideal gas is 22.7 L mol$$^{-1}$$
Login to view the detailed solution.
A solution containing 2 g of a non-volatile solute in 20 g of water boils at 373.52 K. The molecular mass of the solute is ______ g mol$$^{-1}$$. (Nearest integer)
Given, water boils at 373 K, K$$_b$$ for water $$= 0.52$$ K kg mol$$^{-1}$$
Login to view the detailed solution.
Some amount of dichloromethane CH$$_2$$Cl$$_2$$ is added to 671.141 mL of chloroform CHCl$$_3$$ to prepare $$2.6 \times 10^{-3}$$ M solution of CH$$_2$$Cl$$_2$$ DCM. The concentration of DCM is ______ ppm (by mass).
Given: Atomic mass: C = 12; H: 1; Cl = 35.5 density of CHCl$$_3$$ = 1.49 g cm$$^{-3}$$
Consider the cell
Pt, H$$_2$$(g, 1 atm) | H$$^+$$ aq, 1M | Fe$$^{3+}$$ aq, Fe$$^{2+}$$ aq | Pt s
When the potential of the cell is 0.712 V at 298 K, the ratio Fe$$^{2+}$$/Fe$$^{3+}$$ is ______ (Nearest integer)
Given: Fe$$^{3+}$$ + e$$^-$$ = Fe$$^{2+}$$, E° Fe$$^{3+}$$, Fe$$^{2+}$$ Pt = 0.771, $$\frac{2.303RT}{F} = 0.06$$ V
Login to view the detailed solution.
If compound A reacts with B following first order kinetics with rate constant $$2.011 \times 10^{-3}$$ s$$^{-1}$$. The time taken by A (in seconds) to reduce from $$7$$ g to $$2$$ g will be ______. (Nearest Integer)
log5 = 0.698, log7 = 0.845, log2 = 0.301
Login to view the detailed solution.
The number of electrons involved in the reduction of permanganate to manganese dioxide in acidic medium is ______.
Login to view the detailed solution.
A trisubstituted compound 'A', C$$_{10}$$H$$_{12}$$O$$_2$$ gives neutral FeCl$$_3$$ test positive. Treatment of compound 'A' with NaOH and CH$$_3$$Br gives C$$_{11}$$H$$_{14}$$O$$_2$$, with hydroiodic acid gives methyl iodide and with hot conc. NaOH gives a compound B, C$$_{10}$$H$$_{12}$$O$$_2$$. Compound 'A' also decolourises alkaline KMnO$$_4$$. The number of $$\pi$$ bond/s present in the compound 'A' is ______.
Login to view the detailed solution.
Educational materials for JEE preparation