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Consider the reaction
$$4HNO_3(l) + 3KCl(s) \to Cl_2(g) + NOCl(g) + 2H_2O(g) + 3KNO_3(s)$$
The amount of $$HNO_3$$ required to produce 110.0 g of $$KNO_3$$ is (Given: Atomic masses of H, O, N and K are 1, 16, 14 and 39, respectively.)
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$$C(s) + O_2(g) \to CO_2(g) + 400$$ kJ
$$C(s) + \frac{1}{2}O_2(g) \to CO(g) + 100$$ kJ
When coal of purity 60% is allowed to burn in presence of insufficient oxygen, 60% of carbon is converted into 'CO' and the remaining is converted into '$$CO_2$$'. The heat generated when 0.6 kg of coal is burnt is
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Given below are the quantum numbers for 4 electrons.
A. $$n=3, l=2, m_l=1, m_s=+\frac{1}{2}$$
B. $$n=4, l=1, m_l=0, m_s=+\frac{1}{2}$$
C. $$n=4, l=2, m_l=-2, m_s=-\frac{1}{2}$$
D. $$n=3, l=1, m_l=-1, m_s=+\frac{1}{2}$$
The correct order of increasing energy is
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200 mL of 0.01 M HCl is mixed with 400 mL of 0.01 M $$H_2SO_4$$. The pH of the mixture is
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A compound 'X' is a weak acid and it exhibits colour change at pH close to the equivalence point during neutralization of NaOH with $$CH_3COOH$$. Compound 'X' exists in ionized form in basic medium. The compound 'X' is
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Given below are two statements.
Statement I: Stannane is an example of a molecular hydride.
Statement II: Stannane is a planar molecule.
In the light of the above statement, choose the most appropriate answer from the options given below
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Portland cement contains 'X' to enhance the setting time. What is 'X'?
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When borax is heated with CoO on a platinum loop, blue coloured bead formed is largely due to
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Correct structure of $$\gamma$$-methylcyclohexane carbaldehyde is
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Given below are two statements.
Statement I: The compound is optically active.
Statement II: The second compound is mirror image of the above compound A.
In the light of the above statement, choose the most appropriate answer from the options given below.
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Given below are the critical temperatures of some of the gases:
| Gas | Critical temperature (K) |
|---|---|
| He | 5.2 |
| $$CH_4$$ | 190 |
| $$CO_2$$ | 304.2 |
| $$NH_3$$ | 405.5 |
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In liquation process used for tin (Sn), the metal
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Dinitrogen is a robust compound, but reacts at high altitude to form oxides. The oxide of nitrogen that can damage plant leaves and retard photosynthesis is
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Which of the following 3d-metal ion will give the lowest enthalpy of hydration $$\Delta_{hyd}H$$ when dissolved in water?
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Octahedral complexes of copper(II) undergo structural distortion (Jahn-Teller). Which one of the given copper(II) complexes will show the maximum structural distortion? (en = ethylenediamine; $$H_2N-CH_2-CH_2-NH_2$$)
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Compound 'A' undergoes following sequence of reactions to give compound 'B'. The correct structure and chirality of compound 'B' is [where Et is $$-C_2H_5$$]
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When ethanol is heated with conc. $$H_2SO_4$$, a gas is produced. The compound formed, when this gas is treated with cold dilute aqueous solution of Baeyer's reagent, is
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The Hinsberg reagent is
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Which of the following is NOT a natural polymer?
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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: Amylose is insoluble in water.
Reason R: Amylose is a long linear molecule with more than 200 glucose units.
In the light of the above statements, choose the correct answer from the options given below.
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A 1.84 mg sample of polyhydric alcoholic compound 'X' of molar mass 92.0 g/mol gave 1.344 mL of $$H_2$$ gas at STP. The number of alcoholic hydrogen present in compound 'X' is
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Consider, $$PF_5, BrF_5, PCl_3, SF_6, ICl_4^-, ClF_3$$ and $$IF_5$$. Amongst the above molecule(s)/ion(s), the number of molecule(s)/ion(s) having $$sp^3d^2$$ hybridisation is
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'x' g of molecular oxygen $$(O_2)$$ is mixed with 200 g of neon (Ne). The total pressure of the non-reactive mixture of $$O_2$$ and Ne in the cylinder is 25 bar. The partial pressure of Ne is 20 bar at the same temperature and volume. The value of 'x' is [Given: Molar mass of $$O_2$$ = 32 g mol$$^{-1}$$. Molar mass of Ne = 20 g mol$$^{-1}$$]
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1.80 g of solute A was dissolved in 62.5 cm$$^3$$ of ethanol and freezing point of the solution was found to be 155.1 K. The molar mass of solute A is _____ g mol$$^{-1}$$. [Given: Freezing point of ethanol is 156.0 K. Density of ethanol is 0.80 g cm$$^{-3}$$. Freezing point depression constant of ethanol is 2.00 K kg mol$$^{-1}$$]
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For a cell, $$Cu(s)|Cu^{2+}(0.001 M)||Ag^+(0.01 M)|Ag(s)$$, the cell potential is found to be 0.43 V at 298 K. The magnitude of standard electrode potential for $$Cu^{2+}|Cu$$ is _____ $$\times 10^{-2}$$ V. Given: $$E^\theta_{Ag^+/Ag} = 0.80$$ V and $$\frac{2.303RT}{F} = 0.06$$ V
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Assuming 1 $$\mu$$g of trace radioactive element X with a half life of 30 years is absorbed by a growing tree. The amount of X remaining in the tree after 100 years is _____ $$\times 10^{-1}$$ $$\mu$$g. [Given: $$\ln 10 = 2.303$$; $$\log 2 = 0.30$$]
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Consider the following sulphur based oxoacids. $$H_2SO_3, H_2SO_4, H_2S_2O_8$$ and $$H_2S_2O_7$$. Amongst these oxoacids, the number of those with peroxo (O-O) bond is
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Sum of oxidation state (magnitude) and coordination number of cobalt in $$Na[Co(bpy)Cl_4]$$ is
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The number of stereoisomers formed in a reaction of $$[\pm] PhC(=O)C(OH)(CN)Ph$$ with HCN is
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The number of chlorine atoms in bithionol is
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