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Objective Questions with Answer for Chemistry - मुफ्त [PDF] डाउनलोड करें

Last updated on Feb 12, 2026

पाईये मात्रात्मक रूझान उत्तर और विस्तृत समाधान के साथ MCQ प्रश्न। इन्हें मुफ्त में डाउनलोड करें मात्रात्मक रूझान MCQ क्विज़ Pdf और अपनी आगामी परीक्षाओं जैसे बैंकिंग, SSC, रेलवे, UPSC, State PSC की तैयारी करें।
Question 1:
Chemistry

For a reaction of the type: A + B + C → Product; the following observation are made; doubling the conc. of A keeping the other constant doubles the rate; doubling the concentration of B has no effect on the rate (keeping the other two concentration constant) & tripling the concentration of C (keeping that of the other two constant) increases the rate by a factor of 9. Find overall order of the reaction.

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A + B + C → Product जैसी रिएक्शन के लिए, ये बातें देखी गईं: A की कंसंट्रेशन को दोगुना करने पर (बाकी को स्थिर रखते हुए) रेट दोगुना हो जाता है; B की कंसंट्रेशन को दोगुना करने पर रेट पर कोई असर नहीं पड़ता (बाकी दो कंसंट्रेशन को स्थिर रखते हुए) और C की कंसंट्रेशन को तीन गुना करने पर (बाकी दो को स्थिर रखते हुए) रेट 9 गुना बढ़ जाता है। रिएक्शन का कुल ऑर्डर पता करें।

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View Answer & Solution
Correct Answer: B (3)
Question 2:
Chemistry

How many of the following are not antiaromatic?

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नीचे दिए गए में से कितने एंटी-एरोमैटिक नहीं हैं?

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View Answer & Solution
Correct Answer: B (3)
Question 3:
Chemistry

Number of compounds that are colourless in their aqueous solution among the following is

CuSO4, ZnSO4, FeSO4, Cr2(SO4)3, NaCl, KMnO4, K2Cr2O7
 

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नीचे दिए गए यौगिकों में से कितने यौगिक अपने जलीय विलयन में रंगहीन होते हैं?

CuSO4, ZnSO4, FeSO4, Cr2(SO4)3, NaCl, KMnO4, K2Cr2O7

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View Answer & Solution
Correct Answer: A (2)
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Question 4:
Chemistry

If The enthalpy of formation of KCl(s) = x kcal mol-¹) from the data: Find |10X | ?

\(\text { (i) } \mathrm{KOH}(\mathrm{aq})+\mathrm{HCl}(\mathrm{aq}) \longrightarrow \mathrm{KCl}(\mathrm{aq})+\mathrm{H}_2 \mathrm{O}(\mathrm{l}) ; \Delta \mathrm{H}=-13.7 \mathrm{kcal}\)

\(\text { (ii) } \mathrm{H}_2(\mathrm{~g})+\dfrac{1}{2} \mathrm{O}_2(\mathrm{~g}) \longrightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{l}) ; \Delta \mathrm{H}=-68.4 \mathrm{kcal}\)

\(\text { (iii) } \dfrac{1}{2} \mathrm{H}_2(\mathrm{~g})+\dfrac{1}{2} \mathrm{Cl}_{(\mathrm{g})}+\mathrm{aq} \longrightarrow \mathrm{HCl}(\mathrm{aq}) ; \Delta \mathrm{H}=-39.3 \mathrm{kcal}\)

\(\text { (iv) } \mathrm{K}(\mathrm{~s})+\dfrac{1}{2} \mathrm{O}_2(\mathrm{~g})+\dfrac{1}{2} \mathrm{H}_2(\mathrm{aq})+\mathrm{aq} \longrightarrow \mathrm{KOH}(\mathrm{aq}) ; \Delta \mathrm{H}=-116.5 \mathrm{kcal}\)

\(\text { (v) } \mathrm{KCl}(\mathrm{~s})+\mathrm{aq} \longrightarrow \mathrm{KCl}(\mathrm{aq}) ; \Delta \mathrm{H}=+4.4 \mathrm{kcal}\)

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198

211

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दिए गए डेटा से यदि KCl(s) के निर्माण की एन्थैल्पी = x kcal mol⁻¹ है, तो |10x| का मान ज्ञात कीजिए।

\(\text { (i) } \mathrm{KOH}(\mathrm{aq})+\mathrm{HCl}(\mathrm{aq}) \longrightarrow \mathrm{KCl}(\mathrm{aq})+\mathrm{H}_2 \mathrm{O}(\mathrm{l}) ; \Delta \mathrm{H}=-13.7 \mathrm{kcal}\)

\(\text { (ii) } \mathrm{H}_2(\mathrm{~g})+\dfrac{1}{2} \mathrm{O}_2(\mathrm{~g}) \longrightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{l}) ; \Delta \mathrm{H}=-68.4 \mathrm{kcal}\)

\(\text { (iii) } \dfrac{1}{2} \mathrm{H}_2(\mathrm{~g})+\dfrac{1}{2} \mathrm{Cl}_{(\mathrm{g})}+\mathrm{aq} \longrightarrow \mathrm{HCl}(\mathrm{aq}) ; \Delta \mathrm{H}=-39.3 \mathrm{kcal}\)

\(\text { (iv) } \mathrm{K}(\mathrm{~s})+\dfrac{1}{2} \mathrm{O}_2(\mathrm{~g})+\dfrac{1}{2} \mathrm{H}_2(\mathrm{aq})+\mathrm{aq} \longrightarrow \mathrm{KOH}(\mathrm{aq}) ; \Delta \mathrm{H}=-116.5 \mathrm{kcal}\)

\(\text { (v) } \mathrm{KCl}(\mathrm{~s})+\mathrm{aq} \longrightarrow \mathrm{KCl}(\mathrm{aq}) ; \Delta \mathrm{H}=+4.4 \mathrm{kcal}\)

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198

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View Answer & Solution
Correct Answer: C (211)
Question 5:
Chemistry

The number of incorrect statement(s) from the following is -

(i) The successive half-lives of zero-order reactions decrease with time.

(ii) A substance appearing as reactant in the chemical equation may not affect the rate of reaction.

(iii) Order and molecularity of a chemical reaction can be a fractional number.

(iv) The rate-constant units of zero and second-order reactions are mol L¯¹s¯¹ and mol¯¹ Ls¯¹, respectively.

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निम्नलिखित में से गलत कथन(s) की संख्या है –

(i) शून्य-कोटि (Zero-order) अभिक्रियाओं के क्रमिक अर्ध-आयु (successive half-lives) समय के साथ घटते जाते हैं।

(ii) रासायनिक समीकरण में अभिकारक (Reactant) के रूप में उपस्थित कोई पदार्थ अभिक्रिया की दर को आवश्यक नहीं कि प्रभावित करे।

(iii) किसी रासायनिक अभिक्रिया का कोटि (Order) तथा आणविकता (Molecularity) दोनों भिन्नात्मक (Fractional) संख्या हो सकते हैं।

(iv) शून्य-कोटि तथा द्वितीय-कोटि (Second-order) अभिक्रियाओं के दर-नियतांक (Rate constant) की इकाइयाँ क्रमशः mol L⁻¹ s⁻¹ तथा mol⁻¹ L s⁻¹ होती हैं।

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View Answer & Solution
Correct Answer: B (1)
Question 6:
Chemistry

Match List-I with List-II.

(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)

(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)

सूची-I का सूची-II से मिलान करें।

(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)

(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)

View Answer & Solution
Correct Answer: C ((a)-(ii), (b)-(i), (c)-(iv), (d)-(iii))
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Question 7:
Chemistry

The correct order of increasing CFSE is :

\({\left[\mathrm{PtCl}_4\right]^{2-}<\left[\mathrm{PdCl}_4\right]^{2-}<\left[\mathrm{NiCl}_4\right]^{2-}} \\\)

\( {\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}<\left[\mathrm{FeF}_6\right]^{3-}<\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}} \\ \)

\({\left[\mathrm{Ni}^{3-}\left(\mathrm{NH}_3\right)_6\right]^{+2}<\left[\mathrm{Ni}(\mathrm{en})_2\left(\mathrm{NH}_3\right)_2\right]^{2+}<\left[\mathrm{Ni}(\mathrm{en})_3\right]^{2+}} \\\)

\({\left[\mathrm{NiCl}_4\right]^{2-}<\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}<\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_6\right]^{2+}} \)

CFSE के बढ़ने का सही क्रम है :

\({\left[\mathrm{PtCl}_4\right]^{2-}<\left[\mathrm{PdCl}_4\right]^{2-}<\left[\mathrm{NiCl}_4\right]^{2-}} \\\)

\({\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}<\left[\mathrm{FeF}_6\right]^{3-}<\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}} \\\)

\({\left[\mathrm{Ni}^{3-}\left(\mathrm{NH}_3\right)_6\right]^{+2}<\left[\mathrm{Ni}(\mathrm{en})_2\left(\mathrm{NH}_3\right)_2\right]^{2+}<\left[\mathrm{Ni}(\mathrm{en})_3\right]^{2+}} \\\)

\({\left[\mathrm{NiCl}_4\right]^{2-}<\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}<\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_6\right]^{2+}}\)

View Answer & Solution
Correct Answer: C (\({\left[\mathrm{Ni}^{3-}\left(\mathrm{NH}_3\right)_6\right]^{+2}&lt;\left[\mathrm{Ni}(\mathrm{en})_2\left(\mathrm{NH}_3\right)_2\right]^{2+}&lt;\left[\mathrm{Ni}(\mathrm{en})_3\right]^{2+}} \\\))
Solution:

CFSEₒ = −1.2Δₒ and increases with ligand field/chelation (en > NH₃).

[Ni(NH₃)₆]²⁺ < [Ni(en)₂(NH₃)₂]²⁺ < [Ni(en)₃]²⁺.

(A) Wrong: square planar [PtCl₄]²⁻, [PdCl₄]²⁻ ≫ tetra [NiCl₄]²⁻.

(B) Wrong: [Fe(H₂O)₆]³⁺ > [FeF₆]³⁻.

(D) Wrong: square planar [Ni(CN)₄]²⁻ ≫ octa [Ni(NH₃)₆]²⁺.

CFSEₒ = −1.2Δₒ and increases with ligand field/chelation (en > NH₃).

[Ni(NH₃)₆]²⁺ < [Ni(en)₂(NH₃)₂]²⁺ < [Ni(en)₃]²⁺.

(A) Wrong: square planar [PtCl₄]²⁻, [PdCl₄]²⁻ ≫ tetra [NiCl₄]²⁻.

(B) Wrong: [Fe(H₂O)₆]³⁺ > [FeF₆]³⁻.

(D) Wrong: square planar [Ni(CN)₄]²⁻ ≫ octa [Ni(NH₃)₆]²⁺.

Question 8:
Chemistry

The products obtained are

\(\text { Glucos } \mathrm{e} \xrightarrow{\mathrm{HIO}_4}\)

HCOOH

CH₃-CHO

HCHO

Both (A) & (C)

The products obtained are

\(\text { Glucos } \mathrm{e} \xrightarrow{\mathrm{HIO}_4}\)

HCOOH

CH₃-CHO

HCHO

Both (A) & (C)

View Answer & Solution
Correct Answer: D (Both (A) &amp; (C))
Question 9:
Chemistry

The CORRECT order of first ionization potential among the following is.

F⁻ > Cl⁻

Ga > Tl

Sn < Pb

O⁻> S⁻

निम्नलिखित में से प्रथम आयनन विभव का सही क्रम है:

F⁻ > Cl⁻

Ga > Tl

Sn < Pb

O⁻ > S⁻

View Answer & Solution
Correct Answer: C (Sn &lt; Pb)
Solution:

(A) F vs Cl : EA(Cl) > EA(F) extra e is held tighter in Cl, so IE(F) < IE(Cl).
(Statement false)

(B) Group 13 anomaly: due to poor d/f shielding & inert pair effect, IE(Tl) > IE(Ga). (Statement false)

(C) Group14: IE rises slightly from Sn to Pb (inertpair effect) Sn < Pb. (True)

(D) For anions, EA(S) > EA(O) removing e from S is harder, so IE(O) < IE(S). (Statement false)

(A) F vs Cl : EA(Cl) > EA(F) extra e is held tighter in Cl, so IE(F) < IE(Cl).
(Statement false)

(B) Group 13 anomaly: due to poor d/f shielding & inert pair effect, IE(Tl) > IE(Ga). (Statement false)

(C) Group14: IE rises slightly from Sn to Pb (inertpair effect) Sn < Pb. (True)

(D) For anions, EA(S) > EA(O) removing e from S is harder, so IE(O) < IE(S). (Statement false)

CET Graduation and 12th Foundation 2026
Question 10:
Chemistry

\(\begin{gathered} (\mathrm{X}) \\ \mathrm{C}_6 \mathrm{H}_{12} \end{gathered}\)  (Y)+(Z), (Y) & (Z) both show disproportination with conc. NaOH. Then X will be –

(CH₃)₃C-CH₂-CH=CH₂

(CH₃)₃C-CH=CH₂

\(\begin{gathered} (\mathrm{X}) \\ \mathrm{C}_6 \mathrm{H}_{12} \end{gathered}\)  (Y)+(Z), (Y) & (Z) both show disproportination with conc. NaOH. Then X will be –

(CH₃)₃C-CH₂-CH=CH₂

(CH₃)₃C-CH=CH₂

View Answer & Solution
Correct Answer: C ((CH₃)₃C-CH=CH₂)
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