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Chemistry Questions

Chemistry Questions

1. On oxidation of $S_{2}O_{3}^{2 -}$ by $MnO_{4}^{-}$ in neutral aqueous medium, the oxidation number of S would change from:

NTA Abhyas 2022

2. Assertion A: The dihedral angles in $H _{2} O _{2}$ in gaseous phase is $90.2^{\circ}$ and in solid phase is $111.5^{\circ}$.
Reason $R$ : The change in dihedral angle in solid and gaseous phase is due to the difference in the intermolecular forces.
Choose the most appropriate answer from the options given below for $A$ and $R$.

JEE Main 2021 Hydrogen

3. Autoreduction process is used in the extraction of

NTA Abhyas 2022

4. Which of the following will not react with an ammoniacal silver nitrate solution?

Hydrocarbons

5. $ _{21}S{{c}^{41}} $ is:

BVP Medical 2000

6. Free energy change for a reversible process is

Thermodynamics

7. Which of the following statements is correct?

Amines

8. Conjugate acid of $SO_4^{2-}$ is

Equilibrium

9. The species having pyramidal shape is

IIT JEE 2010

10. image
Column I Column II
A $E_{ a }( f )$ p $-10 \,kJ \,mol ^{-1}$
B $E_{ a }( b )$ q $40 \,kJ\, mol ^{-1}$
C $\Delta_r H$ r $30\, kJ\, mol ^{-1}$
D $E_{\text {Threshold }}$ s $50 \,kJ \,mol ^{-1}$

Chemical Kinetics

11. The change in entropy for the fusion of 1 mole of ice is [ $ \text{mp}\,\text{of}\,\text{ice}\,\,\text{=}\,\,\text{273}\,\text{K,} $ , molar enthalpy of fusion for ice $ =\,\,6.0\,\text{kJ}\,\text{mo}{{\text{l}}^{-1}} $ ]

Jharkhand CECE 2007

12. Which of the following is not employed for refining of metal ?

General Principles and Processes of Isolation of Elements

13. The compound that gives both iodoform and Fehling's tests is

J & K CET 2011 Aldehydes Ketones and Carboxylic Acids

14. $n$-Hexane isomerises in presence of anhydrous aluminium chloride and hydrogen chloride gas to give

Hydrocarbons

15. For the given heat of reaction,
(i) $C ( s )+ O _{2}( g ) \rightarrow CO _{2}( g )+97\, kcal$
(ii) $CO _{2}( g )+ C ( s ) \rightarrow 2 CO ( g )-39\, kcal$
the heat of combustion of $CO ( g )$ is

AIRCH 2021

16. If $pK_{a}=4$ and $\text{K}_{\text{a}} = \text{Cα}^{\text{2}}$ , then find van't Hoff factor for a weak HA type acid, when $C=0.01 \, M$ .

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17. In which of the following molecules the central atom does not follow the octet rule?

AIE 3 2021

18. Which of the following is least soluble?

NTA Abhyas 2020 Equilibrium

19. Zeigler - Natta catalyst is:

Coordination Compounds

20. Which of the following represents the given sequence of hybridisation of carbon atoms from left to right $sp^{2}, sp^{2}, sp, sp$?

Organic Chemistry – Some Basic Principles and Techniques

21. Acetone and chloroform reacts to produce:

Rajasthan PMT 2005

22. The noble gas was first time discovered by

Manipal 2010

23. What will be the $ E_{cell} $ for the given cell ?
$ Zn\left|Zn^{2+}\left(0.1\,M\right)\right|\left|Cu^{2+}\left(0.01\,M\right)\right|Cu $
Given : $ E^{\circ}_{Zn^{2+}Zn}=0.76\,V $ and $ E^{\circ}_{Cu^{2+}Cu}=0.34\,V $ .
Also predict whether the reaction is spontaneous or non-spontaneous.

J & K CET 2018 Electrochemistry

24. Which of the following is not isoelectronic?
(a) $Na ^{+}$
(b) $Mg ^{2+}$
(c) $O ^{2-}$
(d) $Cl ^{-}$

BHU 2005

25. Air at sea level is dense. This is a practical application of

States of Matter

26. Which of the following is a polysaccharide?

Biomolecules

27. Under what conditions of temperature and pressure the formation of atomic hydrogen from molecular hydrogen will be favoured most?

NTA Abhyas 2020 The s-Block Elements

28. The co-ordination number of a central metal atom in a complex is determined by

NTA Abhyas 2020 Coordination Compounds

29. $CH_{3}-C\equiv C-CH_{3} \rightarrow _{liquid NH_{3}}^{Na}A \rightarrow _{\Delta }^{KMnO_{4} / O \overset{\ominus}{H}}B$
Product $B$ is :

NTA Abhyas 2020

30. C and Si have