Hemoglobin contains $$0.34\%$$ of iron by mass. The number of Fe atoms in $$3.3 \text{ g}$$ of hemoglobin is (Given: Atomic mass of Fe is $$56u$$, $$N_A = 6.022 \times 10^{23} \text{ mol}^{-1}$$)
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Hemoglobin contains $$0.34\%$$ of iron by mass. The number of Fe atoms in $$3.3 \text{ g}$$ of hemoglobin is (Given: Atomic mass of Fe is $$56u$$, $$N_A = 6.022 \times 10^{23} \text{ mol}^{-1}$$)
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The metal that has very low melting point and its periodic position is closer to a metalloid is
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Arrange the following in increasing order of their covalent character.
(A) $$CaF_2$$
(B) $$CaCl_2$$
(C) $$CaBr_2$$
(D) $$CaI_2$$
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Class XII students were asked to prepare one litre of buffer solution of pH $$8.26$$ by their chemistry teacher. The amount of ammonium chloride to be dissolved by the student in $$0.2M$$ ammonia solution to make one litre of the buffer is (Given $$pK_b(NH_3) = 4.74$$; Molar mass of $$NH_3 = 17 \text{ g mol}^{-1}$$. Molar mass of $$NH_4Cl = 53.5 \text{ g mol}^{-1}$$)
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Given below are two statements:one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Phenolphthalein is a pH dependent indicator, remains colourless in acidic solution and gives pink colour in basic medium.
Reason R: Phenolphthalein is a weak acid. It doesn't dissociate in basic medium.
In the light of the above statements, choose the most appropriate answer from the options given below
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Given below are two statements:one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: LiF is sparingly soluble in water.
Reason R: The ionic radius of $$Li^+$$ ion is smallest among its group members, hence has least hydration enthalpy.
In the light of the above statements, choose the most appropriate answer from the options given below.
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Given below are two statements:one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Boric acid is a weak acid.
Reason R: Boric acid is not able to release $$H^+$$ ion on its own. It receives $$OH^-$$ ion from water and releases $$H^+$$ ion.
In the light of the above statements, choose the most appropriate answer from the options given below.
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The correct decreasing order of priority of functional groups in naming an organic compound as per IUPAC system of nomenclature is
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Which of the following is not an example of benzenoid compound?
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Match List I with List II
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At $$30°C$$, the half life for the decomposition of $$AB_2$$ is $$200 \text{ s}$$ and is independent of the initial concentration of $$AB_2$$. The time required for $$80\%$$ of the $$AB_2$$ to decompose is (Given: $$\log 2 = 0.30$$; $$\log 3 = 0.48$$)
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Given below are two statements:one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Finest gold is red in colour, as the size of the particles increases, it appears purple then blue and finally gold.
Reason R: The colour of the colloidal solution depends on the wavelength of light scattered by the dispersed particles.
In the light of the above statements, choose the most appropriate answer from the options given below
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The metal that is not extracted from its sulphide ore is
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The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are
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The metal complex that is diamagnetic is (Atomic number: Fe, 26; Cu, 29)
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Consider the above reaction and predict the major product.
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Hydrolysis of which compound will give carbolic acid?
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The correct sequential order of the reagents for the given reaction is
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Vulcanization of rubber is carried out by heating a mixture of
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Animal starch is the other name of
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Consider an imaginary ion $$_{22}^{48}X^{3-}$$. The nucleus contains '$$a$$' $$\%$$ more neutrons than the number of electrons in the ion. The value of '$$a$$' is ______.
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A $$10 \text{ g}$$ mixture of hydrogen and helium is contained in a vessel of capacity $$0.0125 \text{ m}^3$$ at $$6 \text{ bar}$$ and $$27°C$$. The mass of helium in the mixture is ______ g. (Given: $$R = 8.3 \text{ J K}^{-1} \text{ mol}^{-1}$$)(Atomic masses of H and He are 1u and 4u, respectively)
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For the reaction $$H_2F_2(g) \rightarrow H_2(g) + F_2(g)$$
$$\Delta U = -59.6 \text{ kJ mol}^{-1}$$ at $$27°C$$
The enthalpy change for the above reaction is $$-$$ ______ $$\text{kJ mol}^{-1}$$ (nearest integer) (Given: $$R = 8.314 \text{ J K}^{-1} \text{ mol}^{-1}$$)
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$$20 \text{ mL}$$ of $$0.02M$$ hypo solution is used for the titration of $$10 \text{ mL}$$ of copper sulphate solution, in the presence of excess of KI using starch as an indicator. The molarity of $$Cu^{2+}$$ is found to be ______ $$\times 10^{-2} M$$ (nearest integer)
Given : $$2Cu^{2+}+4I^{-}\rightarrow Cu_{2}I_{2} + I_{2}I_{2} + 2S_{2}O_{3}^{-2} \rightarrow 2I^{-} + S_{4}O_{6}^{-2}$$
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The elevation in boiling point for 1 molal solution of non-volatile solute A is $$3 \text{ K}$$. The depression in freezing point for 2 molal solution of A in the same solvent is $$6 \text{ K}$$. The ratio of $$K_b$$ and $$K_f$$ i.e., $$K_b/K_f$$ is $$1:X$$. The value of $$X$$ is ______.
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The number of non-ionisable protons present in the product B obtained from the following reaction is ______
$$C_2H_5OH + PCl_3 \rightarrow C_2H_5Cl + A$$
$$A + PCl_3 \rightarrow B$$
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The spin-only magnetic moment value of the compound with strongest oxidizing ability among $$MnF_4$$, $$MnF_3$$ and $$MnF_2$$ is ______ B.M. (nearest integer)
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Total number of isomers (including stereoisomers) obtained on monochlorination of methylcyclohexane is ______.
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A $$100 \text{ mL}$$ solution of $$CH_3CH_2MgBr$$ on treatment with methanol produces $$2.24 \text{ mL}$$ of a gas at STP. The weight of gas produced is ______ mg (nearest integer).
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How many of the following drugs is/are example(s) of broad spectrum antibiotic? Ofloxacin, Penicillin G, Terpineol, Salvarsan
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