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Official Class XII Preparation

(216 Posts)

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This thread is dedicated to preparation for Class XII exams. You may share questions from any of the subjects like Mathematics, Science and Business Studies.

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Yug

Shared from Matrices - 2 (Class - XII) on Apr 12, 2026 11:40 AM

If $A = [\begin{matrix} 0 & 1 & 2 \\ 3 & 5 & 4 \end{matrix}] and B = [\begin{matrix} 7 & 8 & 9 \\ 3 & 2 & 1 \end{matrix}]$ , then which of the following is true?

AB does not exist.

AB is a 2 2 matrix.

AB is a 3 3 matrix.

AB exists.

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Yug

There is an error in this question. Please check this question again

There is an error in this question. Please check this question again Please type your answer before submitting.

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Kalash

Shared from Biology Test on Feb 27, 2022 9:03 PM

The oldest cultivated fruit is

mango

papaya

carrot

orange

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Kalash

Show the answers of wrong question

Show the answers of wrong question Please type your answer before submitting.

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Prerna

Posted on Mar 01, 2022 4:15 PM

Answer is fine. Solution explained.

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Shivam Bhardwaj

Shared from Aldehydes, Ketones on Aug 22, 2020 10:11 AM

Which of the following reactions will yield phenyl acetate?

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Jyoti Bhatia

Phenol reacts with acetic acid giving phenyl acetate as a product. Hence, option (a) is correct.

Phenol reacts with acetic acid giving phenyl acetate as a product. Hence, option (a) is correct. Please type your answer before submitting.

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Manowar Hossain

Shared from Kinship, Caste on Mar 03, 2020 9:08 PM

Which of the following statements is/are correct?

a. Sanskrit texts use the term Kula for identifying the lineage.
b. Matriliny is the term used when descent is traced through the mother.
c. The Kurus were the lineage dominating one of the Janapadas and the Pandavas belonged to this lineage.

only a

only b

only c

only b and c

a, b and c

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Prerna

Mr. Hossain we cannot simplify questions because these questions are based on exam pattern. You have to be well-prepared to solve such questions. Keep learning and keep practising . All the best.

Mr. Hossain we cannot simplify questions because these questions are based on exam pattern. You have to be well-prepared to solve such questions. Keep learning and keep practising . All the best. Please type your answer before submitting.

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Jiya Sagoi

Shared from Atoms and Nuclei on Dec 19, 2019 7:06 AM

For ionising an excited hydrogen atom, the ionisation energy required (in eV) will be

3.4 or less

13.6

more than 13.6

a little less than 13.6

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Jyoti Bhatia

In an excited hydrogen atom, the electron must be present in excited state i.e. n = 2 or in higher excited states. Energy of first excited state, E2 = -13.6/2^2 = -3.4 eV.
rnHence, the ionization energy for excited hydrogen atom will be 3.4 eV or less.
rnThus, option (a) is correct.
rn

In an excited hydrogen atom, the electron must be present in excited state i.e. n = 2 or in higher excited states. Energy of first excited state, E2 = -13.6/2^2 = -3.4 eV. rnHence, the ionization energy for excited hydrogen atom will be 3.4 eV or less. rnThus, option (a) is correct. rn Please type your answer before submitting.

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Official Class XII Preparation

(216 Posts)

This thread is dedicated to preparation for Class XII exams. You may share questions from any of the subjects like Mathematics, Science and Business Studies.