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(b) (i) What are the products formed when ammonia is oxidized with copper oxide?

(ii) Name one lead compound that can be used to oxidize hydrogen chloride to chlorine.

When NaOH is mixed with an unknown non-metallic oxide ‘X’, sodium carbonate is produced. Name the unknown substance X.

$NaOH+X\to N{a}_{2}C{O}_3+H_{2}O$

Which of the given reactions is not an example of redox reaction?

In each of the following pairs, choose the atom having the bigger size :

(a) Mg (Atomic number = 12) or Cl (Atomic number = 17)

(b) Na (Atomic number = 11) or K (Atomic number = 19)

The factors which affect the conductivity of a solution are ___.

Which of the following acid is a weak acid?

(i) When can we use handpicking method of separation?

(ii) Explain the process of Threshing.

(a) Define a combination reaction.

(b) Give one example of a combination reaction which is also exothermic.

(c) Give one example of a combination reaction which is also endothermic.

Most non-metallic among F, Cl, Br, I, and At is:

Write the following properties of ethene :
(a) Physical state,

(b) Odour,
(c) Density as compared to air,

(d) Solubility.

Question 2:

Name three acids used in the laboratory.

In which part of a group would you separately expect the elements to have:

(a) the greatest metallic character?

(b) the largest atomic size ?

Write a note on neutralisation reaction

explain the uses of a sand bath and water bath

$8g$ of $O_2$ has the same number of atoms as

Question 9



Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

(i) It is an endothermic reaction

(ii) It is an exothermic reaction

(iii) The pH of the resulting solution will be more than seven

(iv) The pH of the resulting solution will be less than seven



(a) (i) and (ii)

(b) (ii) and (iii)

(c) (i) and (iv)

(d) (iii) and (iv)

How can we find in which period and group in periodic table a element exist. Explain whole method thoroughly?

Law of Octaves was proposed by:

Pure gold is equal to ___________.

Calculate the mass of

(i) 10²² atoms of sulphur,

(ii) 0.1 mole of carbon dioxide.

[Atomic mass: S = 32, C = 12 and O = 16 and Avogadro's Number = 6 × 10²³]

In theoretical probability approach, the outcomes are

Magnesium + Cold water ______.

How do atomic structures (electron arrangements ) change in a period with increase in atomic numbers moving left to right ?

Define: (a) an electrovalent compound (b) a covalent compound.

Question 23.

Which among the following is not a base ?

(a) $\text{NaOH}$

(b) $\text{KOH}$

(c) ${\text{NH}}_4\text{OH}$

(d) ${\text{C}}_2{\text{H}}_5\text{OH}$

Copy and complete the following table which realtes to three homologous series of hydrocarbons:

$\begin{array}{cccc}\text{General Formula}& C_n{H}_{2n}& C_n{H}_{2n-2}& C_n{H}_{2n+2}\\ \text{IUPAC name of the homologous series}& & & \\ \text{Characteristic bond type}& & & \text{Single bonds}\\ \text{IUPAC name of the first member of the series}& & & \\ \text{Type of reaction with chlorine.}& & \text{Addition}& \end{array}$

Calculate the percentage of platinum in ammonium chloroplatinate (NH₄)₂PtCl₆.