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Chemistry Questions

Chemistry Questions

1. If $200\, ml \,2M\, AlCl_3$ solution is mixed with $300 \,ml \,1\,M \,CaCl_2$ solution. Which of the following is correct statement regarding final solution?

Some Basic Concepts of Chemistry

2. Sodium carbonate is alkaline due to

The s-Block Elements

3. Increasing the temperature of an aqueous solution will cause

Solutions

4. IUPAC name of the following is $CH _{2}= CH - CH _{2}- CH _{2}- C \equiv CH$

Bihar CECE 2012 Organic Chemistry – Some Basic Principles and Techniques

5. In the presence of magnetic field, the possible number of orientations for an orbital of azimuthal quantum number $3$, is

Structure of Atom

6. Which of the following is not a characteristic property of the polar liquids ?

Solutions

7. Which one of the following sets of monosaccharides forms sucrose?

AIPMT 2012 Biomolecules

8. How many grams of concentrated nitric acid solution should be used to prepare $250\, mL$ of $2.0 M HNO _3$ ? The concentrated acid is $70 \% HNO _3$ :

Some Basic Concepts of Chemistry

9. An organic Compound (A) $\left( C _4 H _6\right)$ forms a precipitate with Tollens and Fehling's regents. (A) has an isomer (B). (B) reacts with $1 \,mol$ of $Br _2$ to form 1,4 dibromo-2-butene. (A) and (B) are:

Redox Reactions

10. Among the following metal oxides, which is most basic?

NTA Abhyas 2022

11. 2-phenyl propene on acidic hydration gives,

Hydrocarbons

12. A mixture of cinnamaldehyde and crotonaldehyde is treated with concentrated alkali, Which statement is incorrect about the above reaction?
$C_6H_5 - \overset{\beta}{C}H = \overset{\alpha}{C}H - CHO + \overset{\gamma}{C}H_3 - \overset{\beta}{C}H = \overset{\alpha}{C}H - CHO \xrightarrow{OH^-}$

Aldehydes Ketones and Carboxylic Acids

13. Given below are two statements :
Statement (I) : Neopentane forms only one monosubstituted derivative.
Statement (II) : Melting point of neopentane is higher than n-pentane
In the light of the above statements, choose the most appropriate answer from the options given below :

JEE Main 2025 Hydrocarbons

14. NaCl, $MgCl_{2}$ and $CaSO_{4}$ are known as

NTA Abhyas 2020 Equilibrium

15. For the reaction
$ A ( g )+ B ( g ) \rightarrow 3 C ( g ), 298 K $
If $\Delta U^{\circ}=-10 kJ$ and $\Delta S^{\circ}=40 JK ^{-1}$ then $\Delta G ^{\circ}$ for the reaction is nearly

AIE 1 2023

16. The hydrocarbon (molecular mass = 70) after reduction and chlorination gives a single monochloride. The hydrocarbon is

NTA Abhyas 2020 Hydrocarbons

17. Which statement correctly defines an atomic orbital?

Structure of Atom

18. Ionic radii are

Classification of Elements and Periodicity in Properties

19. The reagent used for the following conversion is

Hydrocarbons

20. The number of isomers exhibited by $ [Cr{{(N{{H}_{3}})}_{3}}C{{l}_{3}}] $ is:

KEAM 2000

21. If value of any Thermodynamic parameter is zero than both the options, one with plus sign and other with negative should be selected.
Column I (Reactions) Column II (Signs of Thermodynamic parameter)
A Isothermal expansion of ideal gas P $\Delta H = + , \Delta S = + \Delta G = -$
B Any substance at its normal freezing point and $1 atm$ pressure, $A _{( S )} \rightleftharpoons A _{(l)}$ Q $\Delta H = - , \Delta S = + \Delta G = -$
C Condensation of any gas into liquid R $\Delta H = - , \Delta S = + \Delta G = -$
D A reaction which is spontaneous at all the temperatures S $\Delta H = - , \Delta S = - \Delta G = +$
T $\Delta H = + , \Delta S = + \Delta G = +$

Thermodynamics

22. Saccharin, an artificial sweetener, is manufactured from:

Chemistry in Everyday Life

23. Which of the following set of elements will have no affinity for electron?

NTA Abhyas 2022

24. At $120^{\circ}C$, the vapour pressure of pure chlorobenzene $(C_{6}H_{5}Cl)$ is $0.736\,atm$ What is the vapour pressure of a solution of 5.00 g of naphthalene $(C_{10}H_{8})$ in 50.0 g of chlorobenzene? (Assume that naphthalene is not volatile)

Solutions

25. A compound with haemoglobin like structure contains one atom of iron per molecule. If it contains 4.6 % iron, its approximate molecular mass is

Some Basic Concepts of Chemistry

26. For a given reaction, energy of activation for forward reaction $E _{ af }$ is $80 kJ mol ^{-1}$ and $\Delta H =-40 kJ mol ^{-1}$. A catalyst lowers $E _{ af }$ to $20 kJ mol ^{-1}$. The ratio of energy of activation for reverse reaction before and after addition of catalyst is:

NTA Abhyas 2020 Chemical Kinetics

27. The following data pertain to reaction between A and B
S. NO $\left[A\right]$ mol $L^{-1}$ $\left[B\right]$ mol $L^{-1}$ Rate mol $L^{-1} \sec^{-1}$
$I$ $1\times 10^{-2}$ $2\times 10^{-2}$ $2 \times 10^{-4}$
$II$ $2\times 10^{-2}$ $2\times 10^{-2}$ $4 \times 10^{-4}$
$III$ $2\times 10^{-2}$ $4\times 10^{-2}$ $8 \times 10^{-4}$

Which of the following inference(s) can be drawn from the above data
(a) Rate constant of the reaction $10^{-4}$
(b) Rate law of the reaction is $k[A][B]$
(c) Rate of reaction increases four times on doubling the concentration of both the reactant, Select the correct answer

Chemical Kinetics

28. The correct order of ionic radii of $Y ^{3+}, La ^{3+}, Eu ^{3+}$ and $Lu ^{3+}$ is (Atomic nos. $Y =39, La =57, Eu =63, Lu =71$ )

The d-and f-Block Elements

29. Which of the following is called picric acid?

Organic Chemistry – Some Basic Principles and Techniques

30. $3\,g$ of activated charcoal was added to $50\,mL$ of acetic acid solution ($0.06\,N$) in a flask. After an hour it was filtered and the strength of the filtrate was found to be $0.042\, N$. The amount of acetic acid adsorbed (per gram of charcoal) is

JEE Main 2015 Some Basic Concepts of Chemistry