Chemistry-
General
Easy
Question
Which of the following metal salts gives a red and opaque borax bead in the reducing flame (in cold) ?
- Ni
- Fe
- Cu
- Mn
The correct answer is: Cu
Related Questions to study
chemistry-
CoS (black) obtained in group IV of salt analysis is dissolved in aqua regia and is treated with an excess of NaHCO3 and then Br2 water. An apple green coloured stable complex is formed. It is :
CoS (black) obtained in group IV of salt analysis is dissolved in aqua regia and is treated with an excess of NaHCO3 and then Br2 water. An apple green coloured stable complex is formed. It is :
chemistry-General
chemistry-
Which of the following is/are correctly matched ?
Which of the following is/are correctly matched ?
chemistry-General
chemistry-
In which of the following pairs the precipitates are red and black coloured respectively and both precipitates are soluble in excess KI solution ?
In which of the following pairs the precipitates are red and black coloured respectively and both precipitates are soluble in excess KI solution ?
chemistry-General
chemistry-
When chlorine (Cl2) water in excess is added to a salt solution containing chloroform, chloroform layer turns pale yellow. Salt contains :
When chlorine (Cl2) water in excess is added to a salt solution containing chloroform, chloroform layer turns pale yellow. Salt contains :
chemistry-General
chemistry-
Zinc pieces are added to acidified solution of SO32 – . Gas liberated can :
Zinc pieces are added to acidified solution of SO32 – . Gas liberated can :
chemistry-General
chemistry-
Statement - 1 : Silica is added as a flux in reverberatory furnace, in the extraction of copper from copper pyrites.
Statement - 2 : Silica decreases the melting point of the ore and remove the impurity of lead sulphide as PbSiO3 .
Statement - 1 : Silica is added as a flux in reverberatory furnace, in the extraction of copper from copper pyrites.
Statement - 2 : Silica decreases the melting point of the ore and remove the impurity of lead sulphide as PbSiO3 .
chemistry-General
physics-
Which of the following wiring diagrams could be used to experimentally determine R using ohm's law? Assume an ideal voltmeter and an ideal ammeter.
Which of the following wiring diagrams could be used to experimentally determine R using ohm's law? Assume an ideal voltmeter and an ideal ammeter.
physics-General
physics-
In the arrangement shown in figure when the switch S2 is open, the galvanometer shows no deflection for l = L/2. When the switch S2 is closed, the galvanometer shows no deflection for l = 5L 12. The internal resistance (r) of 6 V cell, and the emf E of the other battery are respectively
In the arrangement shown in figure when the switch S2 is open, the galvanometer shows no deflection for l = L/2. When the switch S2 is closed, the galvanometer shows no deflection for l = 5L 12. The internal resistance (r) of 6 V cell, and the emf E of the other battery are respectively
physics-General
physics-
A battery of emf 
= 12 V is connected across a 4m long uniform wire having resistance 4 
/m. The cells of small emfs 
= 2V and 
= 4V having internal resistance 2 and 6 respectively, are connected as shown in the figure. If galvanometer shows no deflection at the point N, the distance of point N from the point A is equal to
A battery of emf = 12 V is connected across a 4m long uniform wire having resistance 4 /m. The cells of small emfs = 2V and = 4V having internal resistance 2 and 6 respectively, are connected as shown in the figure. If galvanometer shows no deflection at the point N, the distance of point N from the point A is equal to
physics-General
physics-
In the given potentiometer circuit length of the wire AB is 3 m and resistance is R = 4.5 . The length AC for no deflection in galvanometer is
In the given potentiometer circuit length of the wire AB is 3 m and resistance is R = 4.5 . The length AC for no deflection in galvanometer is
physics-General
physics-
An ammeter A of finite resistance, and a resistor R are joined in series to an ideal cell C. A potentiometer P is joined in parallel to R. The ammeter reading is I0 and the potentiometer reading is V0. P is now replaced by a voltmeter of finite resistance. The ammeter reading now is I and the voltmeter reading is V
An ammeter A of finite resistance, and a resistor R are joined in series to an ideal cell C. A potentiometer P is joined in parallel to R. The ammeter reading is I0 and the potentiometer reading is V0. P is now replaced by a voltmeter of finite resistance. The ammeter reading now is I and the voltmeter reading is V
physics-General
physics-
In the figure, the potentiometer wire AB of length L and resistance 9r is joined to the cell D of emf e and internal resistance r. The cell C’s emf is e/2 and its internal resistance is 2r. The galvanometer G will show no deflection when the length AJ is
In the figure, the potentiometer wire AB of length L and resistance 9r is joined to the cell D of emf e and internal resistance r. The cell C’s emf is e/2 and its internal resistance is 2r. The galvanometer G will show no deflection when the length AJ is
physics-General
physics-
The length of a potentiometer wire is l. A cell of emf E is balanced at a length l/3 from the positive end of the wire. If the length of the wire is increased by l/2. At what distance will the same cell give a balance point
The length of a potentiometer wire is l. A cell of emf E is balanced at a length l/3 from the positive end of the wire. If the length of the wire is increased by l/2. At what distance will the same cell give a balance point
physics-General
physics-
The figure shows a metre-bridge circuit, with AB = 100 cm, X = 12 and R = 18 , and the jockey J in the position of balance. If R is now made 8 , through what distance will J have to be moved to obtain balance?
The figure shows a metre-bridge circuit, with AB = 100 cm, X = 12 and R = 18 , and the jockey J in the position of balance. If R is now made 8 , through what distance will J have to be moved to obtain balance?
physics-General
Physics-
A 6 V battery of negligible internal resistance is connected across a uniform wire of length 1 m. The positive terminal of another battery of emf 4V and internal resistance 1 is joined to the point A as shown in figure. The ammeter shows zero deflection when the jockey touches the wire at the point C. The AC is equal to
A 6 V battery of negligible internal resistance is connected across a uniform wire of length 1 m. The positive terminal of another battery of emf 4V and internal resistance 1 is joined to the point A as shown in figure. The ammeter shows zero deflection when the jockey touches the wire at the point C. The AC is equal to
Physics-General
