Correct Answer: D. Two auricles and two ventricles

Explanation

(a) The condition of the reaction is the presence of ultra-violet light or sunlight.

(ii) Substitution reaction.

(iii) Uses of methane are: (1) It is used as a fuel (2) It is used for making hydrogen, carbon black, carbon (iv) oxide; etc.

(iv) Methane occur as natural gas or refinery gas

(b)(i) (i) Hydrogen is evolved. (ii) Resulting liquid is both colourless (iii) Both reactions are exothermic

(ii)

(iii) Heavy-chemicals are chemicals that pre made in large quantities while fine chemicals are produced in small quantities.

(iv) Examples of heavy chemicals are: H\(_2\)SO\(_4\), NaOH, fertilizer, alum. Examples of fine chemicals are dyes, photographic chemicals, analytical chemicals, drugs.

(c)(i) Empirical formula of X and Y; No of atoms of C = \(\frac{92.3}{12}\) = 7.69

No. of atoms of H = \(\frac{7.7}{1}\)

= 7.7

Ratio of atoms atoms of C:H = \(\frac{7.69}{7.69}\) : \(\frac{7.7}{7.69}\) ; 1 : 1

Empirical formula = CH

(ii) Let the molecular formula of X be (CH)n ; (12 + 1)n = 13n ;

13n = 26

n = \(\frac{26}{13}\) = 2 molecular formula of X =C \(_2\)H \(_2\);

Let the molecular formula of Y be (CH)Y

(12 + 1) Y = 13Y ; 13Y = 78 ; Y = \(\frac{78}{13}\) = 6 ;

Molecular formula of Y = C \(_6\)H \(_6\).

(d)(i) Hydrolysis (ii) Amino acids (iii) Functional groups or amino acids are: amino group (--NH \(_2\)) ai carboxylic group (--COOH).

Correct Answer: C. tertiary alkanol

Explanation

The given formula is (CH3)3COH.

Let's analyze its structure to determine its classification.

The structure can be drawn as follows:

CH3

|

H3C - C - OH

|

CH3

In alcohols, the classification (primary, secondary, tertiary) depends on the number of alkyl groups attached to the carbon atom bearing the hydroxyl (-OH) group. This carbon atom is often called the carbinol carbon.

Let's examine the carbinol carbon in (CH3)3COH:

1. The carbinol carbon is the carbon atom directly bonded to the -OH group.

2. This carbinol carbon is also bonded to three methyl (-CH3) groups. Each methyl group is an alkyl group.

Based on these observations:

• A primary alkanol (1°) has the -OH group attached to a carbon atom that is bonded to only one other carbon atom (R-CH2-OH).

• A secondary alkanol (2°) has the -OH group attached to a carbon atom that is bonded to two other carbon atoms (R1-CH(OH)-R2).

• A tertiary alkanol (3°) has the -OH group attached to a carbon atom that is bonded to three other carbon atoms (R1-C(OH)(R2)(R3)).

Since the carbinol carbon in (CH3)3COH is bonded to three methyl (alkyl) groups, it is a tertiary alkanol. The common name for this compound is tert-butyl alcohol, and its IUPAC name is 2-methylpropan-2-ol.

Let's evaluate the given options:

A. polyhydric alkanol: A polyhydric alkanol contains more than one -OH group. (CH3)3COH only has one -OH group, so it is not polyhydric.

B. secondary alkanol: Incorrect, as the carbinol carbon is bonded to three alkyl groups, not two.

C. tertiary alkanol: Correct, as the carbinol carbon is bonded to three alkyl groups.

D. primary alkanol: Incorrect, as the carbinol carbon is bonded to three alkyl groups, not one.

The final answer is C

Correct Answer: B. Planned expenditure is more than the estimated income

Correct Answer: A. love with hatred

Correct Answer: A. mutation

Explanation

Mutation is the process by which there is a permanent alteration in the DNA sequence of an organism's genome. These changes can occur due to various factors such as exposure to radiation, chemicals, or errors during DNA replication. Mutations can happen in somatic cells, which affect only the individual, or in germ cells (egg or sperm cells), which can be passed on to offspring.

Correct Answer: A. hotel

Explanation

The correct answer is C. human.

• HONOUR is a two-syllable word with the primary stress on the first syllable: HON-our (/ˈɒn.ər/).

• A. hotel has stress on the second syllable: ho-TEL (/hoʊˈtɛl/).

• B. hyena is a three-syllable word with stress on the second syllable: hy-E-na (/haɪˈiː.nə/).

• C. human has stress on the first syllable: HU-man (/ˈhjuː.mən/), matching the stress pattern of *HONOUR*.

• D. humane has stress on the second syllable: hu-MANE (/hjuːˈmeɪn/).

Correct Answer: D. an expenses

Explanation

Expenses are total amount paid or to be paid for resources used in the accounting period e.g wages, electricity, discount allowed, carriage outward etc.

Correct Answer: B. 10

Explanation

To find the next number in the series, let's look at the pattern:

• 7 + 3 = 10

• 10 - 2 = 8

• 8 + 3 = 11

• 11 - 2 = 9

• 9 + 3 = 12

The pattern alternates between adding 3 and subtracting 2.

Following this pattern:

• 12 - 2 = 10

*(Alternatively, you can look at the alternating numbers: 7, 8, 9, 10...)*

Therefore, the correct answer is B. 10.

Correct Answer: A. diastema