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A aqueous reaction in which an insoluble product (precipitate) is formed is called __ reaction.

With the help of labelled diagrams, describe an activity to show that acids produce ions only in aqueous solutions.

how the substitution reaction happens

Sarath decided to paint his house.He added moderate quantity of calcium oxide to water in a plastic container.He observed that the container became warm, got curious and added more of CaO to water. What will be his observation?

What is meant by a primary consumer, secondary consumer and a tertiary consumer? Give one example of each.

We can balance the following ionic equation by adding

6Fe²⁺(aq) + Cr₂O₇^2-(aq) → 6 Fe³⁺(aq) +2Cr ³⁺(aq)

Which of the following would weight most
(a) 1 mole of $H_{2}O,$ (b) 1 mole fo $C{O}_2$,
(c) 1 mole of $N{H}_3$ (D) 1 mole fo CO?

Which of the following sulphates are insoluble in water?

Calculate the actual mass of :
(a) an atom of oxygen,

(b) an atom of hydrogen,
(c) a molecule fo $N{H}_3$,

(d) the atom of silver
(e) th emolecule fo oxygen
(f) 0.25 gram atom of calcium.

The correct relationship between solubility and $K_{sp}$ of $A{g}_{2}C{O}_3$ is:

Which of the following can form more than one acidic salt?

Ram, Kishan and Gopal were partners sharing profits in the ratio of 4 : 2 : 1 respectively.

Following was their Balance Sheet as on 31st March 2013.

BALANCE SHEET
as on 31st March 2013
$\begin{array}{cccc}\text{Liabilities}& \text{Amount}& \text{Assets}& \text{Amount}\\ & \text{(Rs)}& & \text{(Rs)}\\ \text{Capitals :}& & \text{Cash}& 14,000\\ \text{Ram}& 60,000& \text{Stock}& 30,000\\ \text{Kishan}& 40,000& \text{Debtors}& 22,000\\ \text{Gopal}& 30,000& \text{Building}& 40,000\\ \text{Creditors}& 30,000& \text{Plant}& 53,000\\ \text{Bills Payable}& 4,000& \text{Motor Van}& 26,000\\ \text{General Reserve}& 21,000& & \\ & \overline{1,85,000}& & \overline{1,85,000}\end{array}$

On the above date, Ram retired and following adjustments were agreed:

(i) The assets and liabilities were valued as : Stock Rs 24,000, Debtors Rs 21,000, Building Rs 45,200, Plant Rs 50,000 and Creditors Rs 28,000.

(ii) Amount due to Ram will be transferred to Ram's loan account.

Prepare Revaluation Account and Ram's Capital Account.

Analyze the given diagram and identify A and B.

One of the following is not a biodegradable material. This one is:

(a) cotton

(b) animal bones

(c) aluminium foil

(d) wood

Give reason :

(a) Silica gel pouches are kept in unused water bottles.

(b) Table salt becomes moist during rainy season.

(c) On opening a bottle of a cold drink, a fizz sound is heard.

the order of metallic character of elements A, B, C and D is D>A>C>B

1. What is the order of their electronegative character?

2. What is the nature of oxide of B if oxide of A is amphoteric?

What is food chain

Buckminsterfullerene is a spherical molecule in which 60 carbon atoms are arranged in interlocking hexagonal and pentagonal rings of carbon atoms.
(a) How many hexagons of carbon atoms are present in one molecule of buckminsterfullerene ?
(b) How many pentagons of carbon atoms are present in one molecule of buckminsterfullerene ?

Why is conc. HCl not used in place of conc. $H_{2}S{O}_4$ in the laboratory preparation of nitric acid?

Give the common name and IUPAC name of the simplest aldehyde.

A monobasic acid " contains 1 replaceable H+ ion per molecule of the acid (if water soluble ) " What this means ?(same for Di basic acids and tri basic acids)

Which of the following defines the ratio for mass of 1 molecule of gas or vapour to mass of 1 atom of hydrogen?

Which of the following are solutions?

The number of waves in the fourth Bohr orbit of hydrogen is:

Which acid is used in flavoured drinks?

The major ore fo aluminium is known as:
(a) cinnabar (b) calamine (c) bauxite (d) pyrolusite

Choose the correct options regarding homologous series-

Silver is found in nature as a free element as well as compounds because:

Which of the following organic compounds are cyclic?

Classify ecosystems. [5 MARKS]

Which of the following has the maximum non-metallic character ?

Identify the type of hybridisation represented in the below figure.

What is the color of Potassium dichromate?

Identify X in the following reaction:
$HCl$ + X $\to$ $NaCl$ + $H_{2}C{O}_3$
$H_{2}C{O}_3$ $\to$ $H_{2}O$ + $C{O}_2$

What is a thermite reaction? Explain with the help of an equation. State one use of this reaction.

Can there be a covelant bond between 2 non metals or 2 metals?

For the homogeneous gas phase equilibrium $4N{H}_3\left(g\right)+5O_2\left(g\right)\iff 4NO\left(g\right)+6H_{2}O\left(g\right)$ the units of equilibrium constant ${}^{\prime }{K}_C^{\prime }$ are

The covalent compound ionizes in water due to its__ (polar/non-polar) nature.

Give examples of double displacement reactions

Why the combustion of LPG gas is a chemical change

A chemical reaction is said to be in equilibrium when -

What happens when sulphur reacts with concentrated nitric acid?

The number of moles present in 224 L of methane (at STP) is ___

The variable coefficients d, e, f and g are considered for balancing the chemical equation. Relationships between these variable are constructed by balancing the atoms of each element on either side of the reaction. Which of the following are correct?

(Note: Coefficients should be natural numbers.)

(i) 2d= f, d = 3g and e= f + 2g

(ii) 2d = f, 3d = g and 2e = 2f + g

(iii) d = f2, 2d = g and e = 2f + 2g

(iv)d = 1, e = 3.5, f = 4 and g = 6

(v) d = 2, e = 7, f = 4 and g = 6

(vi) d = 2, e = 7, f = 3 and g = 4

Which of these following will be in increasing order in the modern periodic table?