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Chemistry Questions

Chemistry Questions

1. The atomic radii of transition elements from Cr to Cu are almost equal because

NTA Abhyas 2020 The d-and f-Block Elements

2. On commercial scale, sodium hydroxide is prepared by :

The s-Block Elements

3. Which of the following acts as an oxidising as well as reducing agent?

NTA Abhyas 2020 Redox Reactions

4. The formula of siderite is

J & K CET 2011 General Principles and Processes of Isolation of Elements

5. Given the standard potential for the following half-cell reaction at 298 K,
$Cu^{+}\left(a q\right)+e^{-} \rightarrow Cu\left(s\right);$ $E^\circ =0.52V$
$Cu^{2 +}\left(a q\right)+e^{-} \rightarrow Cu^{+}\left(a q\right);$ $E^\circ =0.16V$
Calculate the $\Delta G^\circ $ (kJ) for the reaction, $\left[2 C u^{+} \left(a q\right) \rightarrow C u \left(s\right) + C u^{2 +}\right]$

NTA Abhyas 2022

6. In hypophosphorus acid the number of hydroxyl groups present are :

EAMCET 1996

7. At constant volume and temperature conditions, the rate of diffusion $D_{A}$ and $D_{B}$ of gases $A$ and $B$ having densities $\rho_{A}$ and $\rho_{B}$ are related by the expression

States of Matter

8. The weight of $350\, mL$ of a diatomic gas at $0^{\circ} C$ and $2 \,atm $ pressures is $1 \,g$. The weight of one atom in gram is: (N = Avogadro's number)

States of Matter

9. During which of the following extraction of metal poling process is used:

NTA Abhyas 2022

10. What product forms when $ (CH_3)_2C(OH) CH_2CH_3 $ is treated with $ Cu $ at $ 300^{\circ}C $ ?

J & K CET 2017 Alcohols Phenols and Ethers

11. The reaction of $H _2 O _2$ with potassium permanganate in acidic medium leads to the formation of mainly:

JEE Main 2022 The d-and f-Block Elements

12. The rate of reaction of which of the following is not affected by pressure

Equilibrium

13. If ' $a$ ' stands for the edge length of the cubic systems - The ratio of radii in simple cubic, body centered cubic and face centered cubic unit cells is

KCET 2023 The Solid State

14. Compared with the alkaline earth metals, the alkali metals exhibit

NTA Abhyas 2020 The s-Block Elements

15. Out of following alkenes,
(I) cis-2-butene
(II) Crans-2-butene
(III) propene
(IV) ethene.
Which is the most stable?

AMU 2012

16. $75 \%$ of a first order reaction was completed in $32\, min$, when was $50 \%$ of the reaction completed?

BHU 2007

17. Which of the following is combination reaction?

Language of Chemistry and Transformation of Substances

18. Which of the following statements regarding hydrides is incorrect?

Hydrogen

19. The conditions given below are in the context of observing Tyndall effect in colloidal solutions:
(A) The diameter of the colloidal particles is comparable to the wavelength of light used.
(B) The diameter of the colloidal particles is much smaller than the wavelength of light used.
(C) The diameter of the colloidal particles is much larger than the wavelength of light used.
(D) The refractive indices of the dispersed phase and the dispersion medium are comparable.
(E) The dispersed phase has a very different refractive index from the dispersion medium.
Choose the most appropriate conditions from the options given below:

JEE Main 2021 Surface Chemistry

20. The process of 'eutrophication' is due to

KEAM 2008 Environmental Chemistry

21. Which is used in alcoholic beverages?

Chhattisgarh PMT 2008

22. As per the IUPAC convention, the name of the following compound is
Question

NTA Abhyas 2022

23. Which one of the following contains the highest number of oxygen atoms?

KEAM 2022

24. The amine formed from an amide by means of bromine and alkali has

Amines

25. Dissolving $120 \,g$ of a compound of (mol. wt. $60$) in $1000 \,g$ of water gave a solution of density $1.12 \,g/mL$. The molarity of the solution is :

JEE Main 2014 Some Basic Concepts of Chemistry

26. The most stable oxidation state exhibited by thallium is

Jamia 2014

27. In $ > C = O$ group sigma bond is formed by

Aldehydes Ketones and Carboxylic Acids

28. Which of the following is/are inner orbital complex as well as dimagnetic in nature :
[Atomic no. $\rightarrow Cr =24, Mn =25, Fe =26, Co =27$ ]

Coordination Compounds

29. The oxidation state of chromium is $+6$ in:

The d-and f-Block Elements

30. Acetamide and ethylamine can be distinguished by reacting with

AIIMS 2000 Amines