List of practice Questions

The enthalpy change for the reaction
 \(2H_2(g) + O_2(g) → 2H_2O(l)\)
is -572 kJ/mol. What is the enthalpy change for the formation of 1 mole of \(H_2O(l)\)}?

Which of the following is the IUPAC name for \(CH_3CH_2CH_2OH\)?

What is the hybridization of the central atom in \(NH_3\)?

Kanha, Resham, and Nisha were partners in a firm. Nisha had given a loan of \rupee 1,00,000 to the firm @ 10\% p.a. The accountant of the firm is emphasizing that interest on loan will be paid @ 6\% p.a. At what rate the interest on loan will be paid to Nisha?
Given the linear equation \(2x + 3y – 8 = 0\), write another linear equation in two variables such that the geometrical representation of the pair so formed is: (i) intersecting lines (ii) parallel lines (iii) coincident lines
Vapour pressure of water at 293 K is 17.535 mm Hg. Calculate the vapour pressure of water at 293 K when 25 g of glucose is dissolved in 450 g of water.
Which of the following is correct for A - B?
The mass of 60% HCl by mass required for the neutralisation of 10 L of 0.1 M NaOH is
For the matrix \(A=\begin{bmatrix}1&1&1\\ 1&2&-3\\ 2&-1&3\end{bmatrix}\)show that \(A^3−6A^2+5A+11I=O\).Hence,find A−1.
Do you think the soldiers of the two armies are like each other, or different from each other? Find evidence from the story to support your answer.
The coefficient of $ {{a}^{5}}{{b}^{6}}{{c}^{7}} $ in the expansion of $ {{(bc+ca+ab)}^{9}} $ is
The acceleration due to gravity at a height h above the earths surface is $ 9m{{s}^{-2}}. $ If $ g=10\text{ }m{{s}^{-2}} $ on the earths surface, its value at a point at an equal distance h below the surface of the earth is
Phase difference between voltage and current in a capacitor in an ac circuit is
Antifertilizin or bindin is present over the sperm in the region of
Two charges 5 × 10–8 C and –3 × 10–8 C are located 16 cm apart. At what point(s) on the line joining the to charges is the electric potential zero? Take the potential at infinity to be zero.

Draw all the isomers (geometrical and optical) of: 
(i) \([CoCl_2(en)_2]^{+}\) 
(ii)\( [Co(NH_3)Cl(en)_2] ^{2+} \)
(iii)\( [Co(NH_3)_2Cl_2(en)]^{+}\)

Let A = [1, 2, 3, 4, 5], m be the number of relations such as 4x ≤ 5y XRY and n be the minimum number of elements to be added from A × A to make a symmetric relation. Then the value of n + m.
$0.833$ mole of a carbohydrate with empirical formula $CH_{2}O$ , has $10\, g$ of hydrogen. Molecular formula of the carbohydrate is
The average of four numbers is 48. If the first number is one-third of the sum of the remaining numbers, then the first number is:
The sum of a two-digit number and the number obtained by reversing the digits is 99. If the digits of the number differ by 7, then the two-digit number can be:
The ratio of the ages of Amit and his father is 2:5. After 4 years, the ratio of their ages will become 3:7. What will be the ratio of their ages after 6 years?
PQ and RS are common tangents to two circles intersecting at points A and B. A and B, when produced on both sides, meet the tangents PQ and RS at X and Y, respectively. If AB = 3 cm and XY = 5 cm, then PQ is:
An amount becomes 5 times its original value in 25 years. What is the rate of simple interest per annum?
A train running at the speed of 90 km/h crosses a 400 m long tunnel in 40 seconds. What is the length of the train (in meters)?
A ladder leaning against a wall makes an angle of 45° with the ground. If the length of the ladder is 10 m, what is the distance of the foot of the ladder from the wall?