Assertion: Monoclinic sulphur is an example of monoclinic crystal system. Reason : For a monoclinic system, a ≠ b ≠ c and α=γ=908, β ≠ 908.
a.
Assertion is true but Reason is false.
b.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Correct Answer
c.
Both Assertion and Reason are false.
d.
Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
Step-by-Step AI Explanation
Verified Method
Assertion is true because monoclinic sulphur crystallizes in the monoclinic crystal system. Reason is true because the defining parameters for the monoclinic system are $a \neq b \neq c$ and $\alpha = \gamma = 90^\circ, \beta \neq 90^\circ$. Since the assertion defines the system that the reason describes, the reason is the correct explanation.
The complex is an anionic coordination sphere $[Al(C_2O_4)_3]^{3-}$. The ligand is oxalate ($C_2O_4^{2-}$), named as oxalato. There are three of them, so 'trioxalato'. The metal Aluminium in an anionic complex is named as 'aluminate'. The oxidation state of Al: $x + 3(-2) = -3 \implies x = +3$. Hence, Potassium trioxalato aluminate (III).
Q3mcq1 mark
Which of the following is the strongest acid among all ?
a.
HBr
b.
HI
Correct Answer
c.
HCl
d.
HF
Step-by-Step AI Explanation
Verified Method
Acid strength increases down the halogen group as the bond dissociation energy decreases. HI has the longest bond length and lowest bond dissociation energy among the hydrohalic acids, making the iodide ion a stable conjugate base and HI the strongest acid.
Q4mcq1 mark
Which of the following is not sp2 hybridised ?
a.
Fullerene
b.
Graphite
c.
Dry ice
Correct Answer
d.
Graphene
Step-by-Step AI Explanation
Verified Method
Dry ice is solid $CO_2$. In the $CO_2$ molecule, the carbon atom is $sp$ hybridized because it forms two double bonds (linear geometry). Fullerene, Graphite, and Graphene are all allotropes of carbon where carbon atoms are $sp^2$ hybridized.
Q5mcq1 mark
The pyrimidine bases present in RNA are :
a.
Cytosine and Thiamine
b.
Cytosine and Adenine
c.
Cytosine and Uracil
Correct Answer
d.
Cytosine and Guanine
Step-by-Step AI Explanation
Verified Method
RNA contains the nitrogenous bases Adenine, Guanine, Cytosine, and Uracil. Among these, the pyrimidines are Cytosine and Uracil. Thiamine (Thymine) is found in DNA, not RNA.
Q6mcq1 mark
Aspirin is :
a.
chlorobenzoic acid
b.
acetyl salicylic acid
Correct Answer
c.
anthranilic acid
d.
benzoyl salicylic acid
Step-by-Step AI Explanation
Verified Method
Aspirin is chemically known as acetylsalicylic acid. It is synthesized by the acetylation of salicylic acid using acetic anhydride.
Q7mcq1 mark
In acid medium, potassium permanganate oxidizes oxalic acid to :
a.
acetate
b.
oxalate
c.
acetic acid
d.
carbon dioxide
Correct Answer
Step-by-Step AI Explanation
Verified Method
Potassium permanganate ($KMnO_4$) is a strong oxidizing agent. In acidic medium, it oxidizes oxalic acid ($H_2C_2O_4$) to carbon dioxide ($CO_2$) and water, while Mn is reduced to $Mn^{2+}$.
Q8mcq1 mark
When aniline reacts with acetic anhydride, the product formed is :
a.
p-aminoacetophenone
b.
o-aminoacetophenone
c.
acetanilide
Correct Answer
d.
m-aminoacetophenone
Step-by-Step AI Explanation
Verified Method
The reaction of aniline ($C_6H_5NH_2$) with acetic anhydride ($(CH_3CO)_2O$) is an acetylation reaction. The lone pair on the nitrogen atom of aniline attacks the carbonyl carbon of acetic anhydride, resulting in the formation of acetanilide ($C_6H_5NHCOCH_3$) and acetic acid.
Q9mcq1 mark
Among the following which will not be hydrolysed ?
a.
Sodium Chloride
Correct Answer
b.
Sodium Formate
c.
Ammonium Formate
d.
Ammonium Nitrate
Step-by-Step AI Explanation
Verified Method
Salt hydrolysis is a process where the cation or anion of a salt reacts with water to change the pH. Sodium chloride (NaCl) is a salt of a strong acid (HCl) and a strong base (NaOH). Both $Na^+$ and $Cl^-$ have no tendency to react with water, hence it does not undergo hydrolysis. The others (Sodium Formate, Ammonium Formate, Ammonium Nitrate) involve either weak acid or weak base components that undergo hydrolysis.
Q10mcq1 mark
Among the following cells primary cells are : (i)Leclanche cell (ii)Nickel-Cadmium cell (iii)Lead Storage Battery (iv)Mercury cell
a.
(iii) and (iv)
b.
(i) and (iv)
Correct Answer
c.
(ii) and (iii)
d.
(i) and (iii)
Step-by-Step AI Explanation
Verified Method
Primary cells are non-rechargeable. The Leclanche cell (i) and the Mercury cell (iv) are both primary cells. Nickel-Cadmium (ii) and Lead Storage Battery (iii) are secondary cells because they are rechargeable. Therefore, (i) and (iv) is the correct pair.
🎉 10 Free Sample Solutions Completed
Unlock All 51 Questions & Solutions
Sign up free in seconds to unlock step-by-step AI answers for the remaining 41 questions.
An organic Compound (A) of molecular formula C$_{2}$H$_{4}$O reacts with Zn-Hg/Conc. HCl to give Compound (B) which reacts with HNO$_{3}$ forming Compound (C) (as major product) and Compound (D). Compound (C) reacts with conc. HCl to give Compound (E) (Table vinegar) and hydroxylamine. Identify A, B, C, D and E with suitable reactions.
Correct Answer & Step-by-Step Solution Locked
Sign in free to reveal the correct answer and AI explanation for this question.
