Correct Answer: B. angiosperms and gymonsperms

Correct Answer: D) 50cm³

Explanation

The question is about a reaction between hydrogen and oxygen gases, and the residual gas volume after the reaction mixture passes through an alkaline solution of pyrogallol.

First, let's consider the balanced chemical equation for the reaction between hydrogen and oxygen gases:

\(2H_2(g) + O_2(g) \rightarrow 2H_2O(g)\)

From the equation, we can see that 2 moles of hydrogen gas react with 1 mole of oxygen gas to form 2 moles of water vapor. Now let's examine the initial conditions: 50 cm\(^3\) of hydrogen and 100 cm\(^3\) of oxygen at 110\(^{\circ}\)C and 1 atm.

Since the volume ratio of hydrogen to oxygen is 1:2 in the balanced equation, the reaction will consume all 50 cm\(^3\) of hydrogen and half of the 100 cm\(^3\) of oxygen, leaving 50 cm\(^3\) of oxygen unreacted.

Now, let's consider the effect of passing the reaction mixture through an alkaline solution of pyrogallol. Pyrogallol has a strong affinity for oxygen and will absorb the unreacted oxygen gas. Therefore, the residual gas volume after passing through the pyrogallol solution will only consist of the water vapor produced by the reaction.

Since we started with 50 cm\(^3\) of hydrogen, and the balanced equation shows a 1:1 ratio of hydrogen to water vapor, the water vapor produced also has a volume of 50 cm\(^3\). Therefore, the volume of the residual gas is50 cm\(^3\), which corresponds toOption D.

Correct Answer: C. rhyme

Correct Answer: C. CuSO₄

Correct Answer: B. Simon Peter and Andrew

Correct Answer: C. is useful in times of emergency

Explanation

Delegated legislation allows the use of experts in relevant areas to make more detailed laws and usually consult a wider body of expert opinion. In times of emergency, certain decision making powers can be delegated to this experts for effective and fast results

Correct Answer: B. Perfectly inelastic

Correct Answer: A) Input

Explanation

The correct answer is Option A: Input. A keyboard is a device used to input information into a computer. It has various keys that represent letters, numbers, symbols, and other functions that can be used to communicate with the computer.

It is important to note that computers have several types of devices that can be classified as input, output, or storage devices. Input devices are used to input information into the computer, output devices are used to display or output information from the computer, and storage devices are used to store information on the computer.

Examples of input devices include a mouse, scanner, microphone, and camera. Examples of output devices include a monitor, printer, and speakers. Examples of storage devices include a hard disk drive, flash drive, and CD/DVD.

In summary, a computer keyboard is an input device used to input information into a computer. To learn more about this topic, please read the relevant sections of the recommended textbooks.

Correct Answer: D. x\(^2\) - 6x + 7

Explanation

dy/dx = 2x - 6

y = ∫ 2x - 6

y = \(\frac{2x^2}{2} - 6 + c\)

y = x\(^2\) - 6x + c

passes through (1,2)

2 = 1\(^2\) - 6(1) + c

2 = 1 - 6 + c

c = 7

y = x\(^2\) - 6x + c

y = x\(^2\) - 6x + 7

Correct Answer: C. ease of amending constitution