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The standard unit of force is ___.

Explain the process of neutralization reaction with the help of an example? [5 MARKS]

Question 23

Explain the phrase - “Unity is Strength” on the basis of the making of fabric from fibre

Among the given four bases, which one is considered as the weakest base?

Give reason why -

a) Solids have a definite volume and a definite shape

b) Liquids have a definite volume but no definite shape.

C) Gases have no definite volume and no definite shape.

How do the silk farmers know that when to boil the cocoons and when to get the silk thread off

Question 1 (a)
You must be familiar with the following nursery rhymes:
(i) ‘Baa baa black sheep, have you any wool.’
(ii) ‘Mary had a little lamb, whose fleece was white as snow

Answer the following:
(a) Which parts of the black sheep have wool?

For any cleaning agent or sanitiser, apart from the chemical quality what more is important for the chemical to have total impact?

Apart from carbon, hydrogen and oxygen, our body needs___also.

Question 11 (a)

Fill in the blanks in the following statements.
(a) ___ and ___ Fibres are obtained from animals

Cream from the milk is separated by centrifugation because:

Barium chloride on reacting with ammonium sulfate forms barium sulfate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

If excess of $Zn$ is added to $1.0M$ solution of $CuS{O}_4$, fint the concentration of $C{u}^{2+}$ ions at equilibrium.
Given: $E_{\left(Z{n}^{2+}|Zn\right)}^0=-0.76V,E_{\left(C{u}^{2+}Cu\right)}^0=-0.34V$

What is the full form of ORS? What is it used for? [2 MARKS]

Treatment of Lichens with ______ in presence of air produces various coloured components of Litmus.

Raj's mother served him Horlicks with milk. But there were some particles of Horlicks left un-dissolved, and so he asked his mother to remove those particles. What method of separation should his mother use? Why? [2 MARKS]

Which of the following is not an example of a physical change?

The properties of acrylic fibre

Which of the following are the properties of a solution?
A: It is a homogeneous mixture.
B: The solute particles are smaller than 1nm in diameter.
C: The solute can be separated by sedimentation.

For the first order decomposition reaction of $N_2{O}_5$, it is observed that
$\left(i\right)N_2{O}_5\left(g\right)\to 2N{O}_2\left(g\right)+\frac{1}{2}{O}_2\left(g\right);\frac{-d\left[N_2{O}_5\right]}{dt}=k\left[N_2{O}_5\right]\left(ii\right)2N_2{O}_5\left(g\right)\to 4N{O}_2\left(g\right)+O_2\left(g\right);\frac{-d\left[N_2{O}_5\right]}{dt}=k^{\prime }\left[N_2{O}_5\right]$
Which of the following is true?

Which among the following equation gives the correct relation between resistance $\left(R\right)$, length of conductor $\left(L\right)$, area of the cross-section of the conductor $\left(A\right)$ and resistivity$\left(\rho \right)$?

We brush our teeth with toothpaste that are basic in nature. Explain why? [3 MARKS]

The dissolution of sugar in water is a _________ change.

Generally, the valency of chlorine is _______

Question 4

Open drain system is a breeding place for which of the following?
(a) Flies
(b) Mosquitoes
(c) Organisms which cause diseases
(d) All of these

For any chemical change, the position of equilibrium depends upon ______ of reacting mixture. Choose the most appropriate one.

As I saw in acid and base lesson there should be disclaimer notice on acid containers in white colour but I did not get it in lysol so why did not I get it?

Question 4
Is distilled water acidic, basic or neutral? How would you verify it?

Question 10

Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured crystals got separated (step II). Step I and step II are:
(a) physical and chemical changes respectively
(b) chemical and physical changes respectively
(c) both physical change
(d) both chemical change

Himanshu was suffering from acidity bout. He decided to visit a doctor for treatment. The doctor advised him to take which of the following?

What is the moisture present in atmosphere chemically composed of?

How many distinct cases for the correct responses of the questions exist?

Most common silk moth is:

You want to eat pop-corn. You heat corn seeds in a pan. What type of change is this?

During one of her magic tricks when Sarah rubbed the white paper with a handkerchief, blue letters appeared. Which of the following materials might have been used by her in the magic trick?

Which of the following solution will turn red hibiscus paper to blue?

A steel spoon having mass 200 gram has volume of 100 cc. What will be the volume of a steel glass having mass 600 gram?

Which of the following oxide is neutral in nature?

What of the following indicators shows any change when distilled water is added to them?

The technique used to separate salt from sea water is ___

Why are liquids and gases normally insulators of heat?

Which of the following is NOT true for soil?

What is the Ph of Water(H₂​​​​​​​0)?